TWI852902B - Hardening resin composition for forming easy-peel film and its production method - Google Patents

Abstract

The present invention discloses a curable resin composition which can be coated on the surface of a glass substrate to form a curable resin film which can withstand baking at 230° C. and can be easily peeled off from the substrate without much effort. The composition is a curable resin composition, which comprises a chain polymer having a side chain with an alcoholic secondary or tertiary hydroxyl group, and a crosslinking agent, wherein (a) the side chain comprises 3 to 30 carbon atoms, and comprises at least one saturated or unsaturated hydrocarbon group, or further comprises at least one aromatic group, and may comprise a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-; and (b) the crosslinking agent is selected from the group consisting of a trioxane compound and/or its condensate, a glycoluril compound and/or its condensate, and an imidazolidinone compound and/or its condensate.

Description

Hardening resin composition for forming easy-peel film and its production method

The present invention relates to a curable resin composition, more specifically, a curable resin composition for forming an easily peelable film, and more particularly, to a curable resin composition that can be coated on a substrate such as glass and cured to form a thin film, thereby providing a thin film that can be easily peeled off from the substrate without much effort, and more particularly, to a curable resin composition that provides a thin film that is not easily modified even when subjected to heat treatment and that easily maintains easy peelability.

Display devices such as liquid crystal display devices are widely used in ticket machines, ATMs, portable terminals such as smartphones, computers, and various other electrical and electronic devices. The screens of these display devices are generally rigid and flat. In contrast, the industry is developing flexible display devices, which reflect the expansion of the potential uses of display devices and have screens that can achieve a certain degree of deformation. As a substrate for a bendable circuit, there is a base film made of resin, but when used in the screen of a display device, it is required to be able to produce a fine circuit and be transparent and as thin and light as possible. When making various fine electrical and electronic circuits on a resin base film, for example, photolithography is used, and according to the purpose and method, the metal film formation on the base film, the coating of the photoresist film, pre-baking, the exposure of the circuit pattern, the development caused by the dissolution of the resist, rinsing, baking, etching, photoresist removal and other processes are repeatedly performed to make the circuit. Furthermore, an anisotropic conductive film (ACF) is arranged between or on the layers made in this way as needed, and a printed wiring substrate is arranged at the necessary position thereon and heated and pressurized, thereby making the circuit connection between the printed wiring substrate and the metal wiring through the anisotropic conductive film. When the entire circuit is made in the form of a laminate in this way, it generally includes several baking steps. For the performance of the circuit, it is ideal to bake at a sufficiently high temperature (about 230°C), but the upper limit of the temperature at which baking can be performed is restricted by the heat resistance of the base film. That is, if the area is not on the low temperature side below the limit that the base film can tolerate, baking in each step cannot be performed. Although other materials (such as nanosilver particles) can be used as metal wiring that can be baked in such a low temperature area, the wiring made by low-temperature baking using them has poorer characteristics than the previous wiring using ITO, so it is technically inferior. In addition, the base film is required to be thinner every year, but the heat resistance of the base film decreases with thinning. As a result, the upper limit of the heat treatment temperature is currently reduced to about 100°C, and there is the following problem: If the upper limit of the temperature that the base film can withstand during the heat treatment is further reduced due to the further thinning requirements in the future, it will be difficult to find a base film material that can cope with baking at a temperature that can maintain circuit performance. Therefore, a base film material that can withstand higher temperatures than previous materials is required. In addition, with the thinning, it is expected that a very thin film of about 300 nm is used for the base film. Therefore, in the method of applying the resin composition as the base film material to other substrates (glass substrates, etc.) and hardening it by heat curing, etc. to form a film, it is necessary to prepare the base film. If circuit components such as metal wiring are sequentially formed in layers on the extremely thin base film formed on a glass substrate, anisotropic conductive film is provided, printed circuit board wiring is laminated, circuit connection is performed, and an insulating protective film is laminated, then the base film and the layers formed thereon are peeled off from the glass substrate as a single laminate, and a laminate as a circuit component is obtained. Here, the laminate must be easily peeled off from the glass substrate without much effort. The reason is that otherwise, the load during peeling will cause greater strain in the laminate, resulting in disconnection of metal wiring or peeling of circuit connections, which will lead to a significant deterioration in the yield of the product. In particular, even if the substrate material itself can withstand heat treatment at higher temperatures in a thin film state than previous materials, if the baking in the process of making wiring on it is carried out at a correspondingly high temperature, the substrate material and the surface of the substrate on which the substrate material is placed will easily adhere. Therefore, as a substrate material, it is not enough to withstand baking at high temperatures in a thin film state than previous materials. It must have the property of being able to be easily peeled off from the substrate without much effort after such high-temperature baking. Furthermore, as mentioned above, the base film is very thin, so the resin material used to form the base film must have the property of being not repelled by the substrate when applied to the substrate (glass substrate, etc.) and spreading evenly and very thinly. On the other hand, such affinity to the substrate will cause the substrate to adhere to the substrate during the baking process, which is also a factor that will lose the easy peelability. [Prior Art Document] [Patent Document] Patent Document 1: International Publication No. 2015/016532

[Technical means for solving the problem] Against the above background, the purpose of the present invention is to provide a curable resin composition that can be coated very thinly on the surface of a substrate (glass, etc.) to form a film, can be cured to form a curable resin film, can withstand a high temperature of 230°C during baking in the process of making a circuit on the curable resin film by patterning, and can be easily peeled off from the substrate without any effort after exposure to such a high temperature. The inventors of the present invention have found that the above purpose can be achieved by a curable resin composition comprising a polymer having side chains with structural characteristics within a specific range and a crosslinking agent within a specific range. That is, the present invention provides the following items. Item A1. A curable resin composition comprising a chain polymer having a side chain having an alcoholic secondary or tertiary hydroxyl group, and a crosslinking agent, wherein (a) the side chain comprises 3 to 30 carbon atoms and comprises at least one saturated or unsaturated hydrocarbon group, or further comprises at least one aromatic group, and may comprise a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-; and (b) the crosslinking agent is selected from a tri-hydrazide crosslinking agent or a glycoluril crosslinking agent. Item A2. The curable resin composition as described in the above items, wherein the chain polymer is composed of the following monomer units, which are monomer units having the side chain having an alcoholic secondary or tertiary hydroxyl group, and are at least one of (meth)acrylic monomers, vinyl ester monomers, vinyl ether monomers, and vinyl monomers other than these. Item A3. The curable resin composition as described in any of the above items, wherein the chain polymer is composed of a monomer unit selected from _CH2 =CH-COO-R1, CH2=C( _CH3 )-COO- ^R2 , CH2=CH-O-CO-R3, _CH2 =CH-OR4, and CH2=CH-R5 (herein, ^R1 , R2, ^R3 , ^R4 , and ^R5 are selected from the group consisting of ^CH2 =CH-COO-R1, _CH2 =C(CH3)-COO-R2, _CH2 =CH-O-CO- ^R3 , _CH2 =CH- ^OR4 , and CH2=CH-R5) ^{. 5} is composed of monomer units selected from the group consisting of compounds represented by (a) which independently have 3 to 30 carbon atoms including the carbon atom constituting the ester bond when bonded to each vinyl group via an ester bond, have an alcoholic secondary or tertiary hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-. Item A4. A curable resin composition as described in any of the above items, wherein the chain polymer further comprises an additional monomer unit, and the additional monomer unit is at least one of a (meth)acrylic monomer, a vinyl ester monomer, a vinyl ether monomer, and a vinyl monomer other than these monomers which does not have a hydroxyl group and has 1 to 15 carbon atoms in the side chain. Item A5. A curable resin composition as described in any of the above items, wherein the additional monomer unit is selected from _CH2 =CH-COO- ^R6 , _CH2 =C( _CH3 )-COO- ^R7 , _CH2 =CH-O-CO- ^R8 (herein, ^R6 , ^R7 and ^R8 independently have 1 to 15 carbon atoms, have no hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, and the hydrocarbon group or aromatic group may have an amine group), CH2=CH-OR9, CH2=CH-R10 (herein, R9 and R11 are independently selected from the group consisting of -COO-, -O-, and -CO-, and the hydrocarbon group or aromatic group may have an amino group), _CH2 =CH- ^OR9 , CH2=CH- ^R10 (herein, ^R9 and R12 are independently selected from the group consisting of -COO-, -O-, and -CO-, and the hydrocarbon group or aromatic group may have an amino group), CH2=CH-OR9, _CH2 =CH-R10 ¹⁰ independently have 3 to 15 carbon atoms, have no hydroxyl group, contain at least one saturated or unsaturated alkyl group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, and the alkyl group or aromatic group may have an amine group), C ₄ HO ₃ -R ¹¹ , and C ₄ H ₂ NO ₂ -R ¹² (herein, C ₄ HO ₃ - represents a maleic anhydride group, C ₄ H ₂ NO ₂ - represents a maleic anhydride group, R ¹¹ , and R ¹² is independently a hydrogen atom or has 1 to 15 carbon atoms, has no hydroxyl group, contains at least one saturated or unsaturated hydrocarbon group, or further contains at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, and the hydrocarbon group or aromatic group may have an amine group). Item A6. A curable resin composition as described in any of the above items, wherein the ratio of monomer units having alcoholic secondary or tertiary hydroxyl groups in the monomer units constituting the chain polymer is 30 to 100 mol%. Item A7. A hardening resin composition as described in any of the above items, wherein the crosslinking agent is selected from the group consisting of completely or partially alkoxymethylated melamine, completely or partially alkoxymethylated guanamine, completely or partially alkoxymethylated acetoguanamine, completely or partially alkoxymethylated benzoguanamine, and completely or partially alkoxymethylated glycoluril. Item A8. A hardening resin composition as described in any of the above items, wherein the ratio of the mass of the linear polymer to the mass of the crosslinking agent in the composition is 1:2 to 1:0.05. Item A9. A hardening resin composition as described in any of the above items, which contains a solvent. Item A10. A hardening resin film, which is formed by hardening the hardening resin composition as described in any of the above items. Item A11. A peelable hardening resin film, which is formed by hardening a hardening resin composition such as any of the above items on a substrate surface into a film shape. Item A12. A method for manufacturing a hardening resin film, which is a method for manufacturing a hardening resin film, the method comprising: preparing a chain polymer having a side chain with an alcoholic secondary or tertiary hydroxyl group and a crosslinking agent; applying a composition comprising the chain polymer and the crosslinking agent on a substrate to form a hardening resin composition coating; and forming a hardening resin film by subjecting the hardening resin composition coating to a polymerization reaction to harden it, wherein, (a) The side chain is composed of 3 to 30 carbon atoms and contains at least one saturated or unsaturated hydrocarbon group, or in addition thereto contains at least one aromatic group, and may contain a bond selected from the group consisting of -COO-, -O-, and -CO- that connects the carbon atoms of adjacent groups therein; (b) The crosslinking agent is selected from tri-hydrazide crosslinking agents or glycoluril crosslinking agents. Item A13. The production method as described in the above item, wherein the chain polymer is composed of the following monomer units, which are monomer units having the side chain having an alcoholic secondary or tertiary hydroxyl group, and are at least one of any one of a (meth)acrylic acid monomer, a vinyl ester monomer, a vinyl ether monomer, and vinyl monomers other than these. Item A14. The method of any one of the above items, wherein the chain polymer comprises a group selected from _CH2 =CH-COO- ^R1 , _CH2 =C( _CH3 )-COO- ^R2 , _CH2 =CH-O-CO- ^R3 , _CH2 =CH- ^OR4 , and _CH2 =CH- ^R5 (herein, ^R1 , ^R2 , ^R3 , ^R4 , and R5 are ⁵ is composed of monomer units selected from the group consisting of compounds represented by (a) which independently have 3 to 30 carbon atoms including the carbon atom constituting the ester bond when bonded to each vinyl group via an ester bond, have an alcoholic secondary or tertiary hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-. Item A15. A production method as described in any of the above items, wherein the chain polymer further comprises the following additional monomer units, and the additional monomer units are at least one of any (meth)acrylic acid monomers, vinyl ester monomers, vinyl ether monomers, and vinyl monomers other than these monomers, which do not have a hydroxyl group and have 1 to 15 carbon atoms in the side chain. Item A16. The production method of any of the above items, wherein the additional monomer unit is selected from _CH2 =CH-COO- ^R6 , _CH2 =C( _CH3 )-COO- ^R7 , _CH2 =CH-O-CO- ^R8 (herein, ^R6 , ^R7 , and ^R8 independently have 1 to 15 carbon atoms, have no hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-), CH2=CH-OR9, CH2=CH-R10 (herein, R9, and R8 are independently selected from the group consisting of -COO-, -O-, and -CO-), _CH2 =CH- ^OR9 , _CH2 =CH- ^R10 (herein, ^R9 , and R10 are independently selected from the group consisting of -COO-, -O-, and -CO-). ¹⁰ independently have 3 to 15 carbon atoms, have no hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-), C ₄ HO ₃ -R ¹¹ , and C ₄ H ₂ NO ₂ -R ¹² (herein, C ₄ HO ₃ - represents a maleic anhydride group, C ₄ H ₂ NO ₂ - represents a maleic anhydride group, R ¹¹ , and R ¹² is independently a hydrogen atom or has 1 to 15 carbon atoms, has no hydroxyl group, contains at least one saturated or unsaturated hydrocarbon group, or further contains at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-). Item A17. The production method of any of the above items, wherein the ratio of monomer units having alcoholic secondary or tertiary hydroxyl groups in the monomer units constituting the chain polymer is 30 to 100 mol%. Item A18. A manufacturing method as described in any of the above items, wherein the crosslinking agent is selected from the group consisting of completely or partially alkoxymethylated melamine, completely or partially alkoxymethylated guanamine, completely or partially alkoxymethylated acetylguanamine, or completely or partially alkoxymethylated benzoguanamine, and completely or partially alkoxymethylated glycoluril. Item A19. A manufacturing method as described in any of the above items, wherein the ratio of the mass of the linear polymer in the composition to the mass of the crosslinking agent is 1:2 to 1:0.05. Item A20. A manufacturing method as described in any of the above items, wherein the composition contains a solvent. Item A21. A manufacturing method for a hardened resin film as described in any of the above items, further comprising the step of peeling the hardened resin film formed on the substrate from the substrate. In addition, the present invention provides the following items. Item B1. A curable resin composition, comprising a chain polymer having a side chain with an alcoholic secondary or tertiary hydroxyl group, and a crosslinking agent, wherein (a) the side chain comprises 3 to 30 carbon atoms, and comprises at least one saturated or unsaturated hydrocarbon group, or further comprises at least one aromatic group, and may comprise a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-; (b) the crosslinking agent is selected from the group consisting of a trioxane compound and/or its condensate, a glycoluril compound and/or its condensate, and an imidazolidinone compound and/or its condensate. Item B2. A curable resin composition as described in the above item, wherein the chain polymer is composed of the following monomer units, which are monomer units having the side chain having an alcoholic secondary or tertiary hydroxyl group, and are at least one of unsubstituted or α-substituted (meth)acrylic monomers, unsubstituted or α-substituted vinyl ester monomers, unsubstituted or α-substituted vinyl ether monomers, and unsubstituted or α-substituted vinyl monomers other than these. Item B3. The hardening resin composition of any of the above items, wherein the chain polymer comprises a group selected from _CH2 =C( ^R1a )-COO- ^R1 , _CH2 =C( ^R1a )-O-CO- ^R3 , _CH2 =C( ^R1a ) ^-OR4 , and _CH2 =C( ^R1a ) ^-R5 (herein, ^R1 , ^R3 , ^R4 , and R ⁵ independently has 3 to 30 carbon atoms including the carbon atom constituting the ester bond when bonded to each vinyl group via an ester bond, has an alcoholic secondary or tertiary hydroxyl group, contains at least one saturated or unsaturated hydrocarbon group, or further contains at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, and R ^1a is a monomer unit selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted alkenyl). Item B4. The hardening resin composition as described in any of the above items, wherein the chain polymer comprises the formula A1: [Chemical 1] (Herein, R ^1a is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted alkenyl, L ¹ is selected from the group consisting of a single bond, substituted or unsubstituted alkylene, and substituted or unsubstituted alkenylene, R ^2a , R ^3a , and R ^4a are independently selected from the group consisting of hydrogen and substituted or unsubstituted alkyl, but at least one of R ^2a , R ^3a , and R ^4a is a substituted or unsubstituted secondary or tertiary OH-containing group) The hardening resin composition of any of the above items, wherein the chain polymer comprises formula A2: [Chemical 2] (Herein, R ^1a is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted alkenyl, L ¹ is selected from the group consisting of a single bond, substituted or unsubstituted alkylene, and substituted or unsubstituted alkenylene, R ^5a to R ^14a are independently selected from the group consisting of hydrogen, hydroxyl, and [Chemical 3] or together form a ring, except that at least one of R ^5a to R ^14a or the substituents of the ring is a hydroxyl group, and R ^15a is selected from the group consisting of substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted cycloalkenyl, substituted or unsubstituted aromatic, and substituted or unsubstituted heteroaromatic). Item B6. The curable resin composition of any of the above items, wherein the chain polymer comprises formula A3: [Chemical 4] (Herein, R ^1a is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted alkenyl, L ² is selected from the group consisting of substituted or unsubstituted alkylene, and substituted or unsubstituted alkenylene, R ^16a is selected from the group consisting of substituted or unsubstituted alkylene, substituted or unsubstituted alkenyl, and substituted or unsubstituted alkynyl, R ^17a is selected from the group consisting of hydrogen, substituted or unsubstituted alkylene, substituted or unsubstituted alkenyl, and substituted or unsubstituted alkynyl) The hardening resin composition according to any of the above items, wherein the chain polymer comprises Formula A4: [Chemical 5] (Herein, R ^1a is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted alkenyl, L ¹ is selected from the group consisting of a single bond, substituted or unsubstituted alkylene, and substituted or unsubstituted alkenylene, and R ^18a is an adamantyl group substituted with at least one hydroxyl group). Item B8. The hardening resin composition of any of the above items, wherein the chain polymer comprises Formula A5: [Chemical 6] (herein, R ^1a is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted alkenyl, L ¹ is selected from the group consisting of a single bond, substituted or unsubstituted alkylene, and substituted or unsubstituted alkenylene, R ^19a is selected from the group consisting of substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkyl, and substituted or unsubstituted cycloalkenyl) The hardening resin composition according to any of the above items, wherein R ^19a is a substituted or unsubstituted adamantyl. Item B10. A curable resin composition comprising a chain polymer having a side chain having an alcoholic secondary or tertiary hydroxyl group, and a crosslinking agent, wherein (a) the side chain comprises 3 to 30 carbon atoms and comprises at least one saturated or unsaturated hydrocarbon group, or further comprises at least one aromatic group, and may comprise a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, and (b) the crosslinking agent is selected from a tri-hydrazide crosslinking agent or a glycoluril crosslinking agent. Item B11. The curable resin composition of any of the above items, wherein the chain polymer is composed of the following monomer units, which are monomer units having the side chain having an alcoholic secondary or tertiary hydroxyl group, and are at least one of a (meth)acrylic monomer, a vinyl ester monomer, a vinyl ether monomer, and vinyl monomers other than these. Item B12. The curable resin composition of any of the above items, wherein the chain polymer is selected from _CH2 =CH-COO- ^R1 , _CH2 =C( _CH3 )-COO- ^R2 , _CH2 =CH-O-CO- ^R3 , _CH2 =CH- ^OR4 , and _CH2 =CH- ^R5 (herein, ^R1 , ^R2 , ^R3 , ^R4 , and R5 are the same as those in the above items). ⁵ is a monomer unit selected from the group consisting of compounds represented by (a) which independently has 3 to 30 carbon atoms including the carbon atom constituting the ester bond when the monomer unit is bonded to each vinyl group via an ester bond, has an alcoholic secondary or tertiary hydroxyl group, contains at least one saturated or unsaturated hydrocarbon group, or further contains at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-. Item B13. The curable resin composition as described in any of the above items, wherein the monomer unit is a (meth)acrylic monomer. Item B14. The curable resin composition as described in any of the above items, wherein R ^1a is hydrogen or methyl. Item B15. A curable resin composition as described in any of the above items, wherein the chain polymer further comprises the following additional monomer units, and the additional monomer units are at least one of unsubstituted or α-substituted (meth)acrylic monomers, unsubstituted or α-substituted vinyl ester monomers, unsubstituted or α-substituted vinyl ether monomers, and unsubstituted or α-substituted vinyl monomers other than these monomers, which may or may not have a hydroxyl group and have 1 to 15 carbon atoms in the side chain. Item B16. A curable resin composition as described in any of the above items, wherein the additional monomer unit is selected from the group consisting of _CH2 =C( ^R1a )-COO- ^R6 , _CH2 =C( ^R1a )-O-CO- ^R8 (wherein ^R6 and ^R8 independently have 1 to 15 carbon atoms, may or may not have a hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, the hydrocarbon group or aromatic group may have an amine group, and ^R1a is selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, and a substituted or unsubstituted alkenyl group), _CH2 =C( ^R1a )-OR ⁹ , CH ₂ =C(R ^1a )-R ¹⁰ (herein, R ⁹ and R ¹⁰ independently have 3 to 15 carbon atoms, may or may not have a hydroxyl group, include at least one saturated or unsaturated alkyl group, or further include at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, the alkyl group or aromatic group may have an amine group, and R ^1a is selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, and a substituted or unsubstituted alkenyl group), C ₄ (R ^1a )O ₃ -R ¹¹ , and C ₄ (R ^1a )HNO ₂ -R ¹² (herein, C ₄ (R ^1a )O ₃ - represents an unsubstituted or substituted maleic anhydride group, C ₄ (R ^1a )HNO ₂ - represents an unsubstituted or substituted maleimide group, R ¹¹ and R ¹² are independently a hydrogen atom or a group having 1 to 15 carbon atoms, which may or may not have a hydroxyl group, which contains at least one saturated or unsaturated alkyl group, or further contains at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, the alkyl group or aromatic group may have an amine group, and R ^1a is selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, and a substituted or unsubstituted alkenyl group). Item B17. A curable resin composition as described in any of the above items, wherein the chain polymer further comprises the following additional monomer units, and the additional monomer units are at least one of (meth)acrylic acid monomers, vinyl ester monomers, vinyl ether monomers, and vinyl monomers other than these monomers, which do not have a hydroxyl group and have 1 to 15 carbon atoms in the side chain. Item B18. A curable resin composition as described in any of the above items, wherein the additional monomer unit is selected from _CH2 =CH-COO- ^R6 , _CH2 =C( _CH3 )-COO- ^R7 , _CH2 =CH-O-CO- ^R8 (herein, ^R6 , ^R7 and ^R8 independently have 1 to 15 carbon atoms, have no hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, and the hydrocarbon group or aromatic group may have an amine group), CH2=CH-OR9, CH2=CH-R10 (herein, R9, and R11 are independently selected from the group consisting of -COO-, -O-, and -CO-, and the hydrocarbon group or aromatic group may have an amino group), _CH2 =CH-OR9, CH2=CH- ^R10 (herein, ^R9 , and R12 are independently selected from the group consisting of -COO-, -O-, and -CO-, and the hydrocarbon group or aromatic group may have an amino group), CH2=CH- ^OR9 , _CH2 =CH-R10 ¹⁰ independently have 3 to 15 carbon atoms, have no hydroxyl group, contain at least one saturated or unsaturated alkyl group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, and the alkyl group or aromatic group may have an amine group), C ₄ HO ₃ -R ¹¹ , and C ₄ H ₂ NO ₂ -R ¹² (herein, C ₄ HO ₃ - represents a maleic anhydride group, C ₄ H ₂ NO ₂ - represents a maleic anhydride group, R ¹¹ , and R ¹² is independently a hydrogen atom or has 1 to 15 carbon atoms, has no hydroxyl group, contains at least one saturated or unsaturated hydrocarbon group, or further contains at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, and the hydrocarbon group or aromatic group may have an amine group). Item B19. A curable resin composition as described in any of the above items, wherein the ratio of monomer units having alcoholic secondary or tertiary hydroxyl groups in the monomer units constituting the chain polymer is 30 to 100 mol%. Item B20. A hardening resin composition as described in any of the above items, wherein the crosslinking agent is selected from the group consisting of completely or partially alkoxymethylated melamine and/or its condensate, completely or partially alkoxymethylated guanamine and/or its condensate, completely or partially alkoxymethylated acetoguanamine and/or its condensate, completely or partially alkoxymethylated benzoguanamine and/or its condensate, completely or partially alkoxymethylated glycoluril and/or its condensate, and completely or partially alkoxymethylated imidazolidinone and/or its condensate. Item B21. A hardening resin composition as described in any of the above items, wherein the crosslinking agent is selected from the group consisting of Formula B1: [Chemical 7] (Herein, R ^1b has 1 to 25 carbon atoms and is selected from substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted aromatic, substituted or unsubstituted heteroaromatic, and [Chemical 8] R ^2b to R ^7b independently have 1 to 10 carbon atoms and are selected from the group consisting of substituted or unsubstituted alkyl and substituted or unsubstituted alkenyl) a compound represented by and/or its condensate, Formula B2: [Chem. 9] (herein, R ^8b to R ^11b independently have 1 to 10 carbon atoms and are selected from the group consisting of substituted or unsubstituted alkyl and substituted or unsubstituted alkenyl) a compound represented by and/or a condensate thereof, and formula B3: [Chemical 10] (herein, R ^12b and R ^13b independently have 1 to 10 carbon atoms and are selected from the group consisting of substituted or unsubstituted alkyl and substituted or unsubstituted alkenyl, R ^14b and R ^15b independently are hydrogen or have 1 to 10 carbon atoms and are selected from the group consisting of substituted or unsubstituted alkyl and substituted or unsubstituted alkenyl) and/or condensates thereof. Item B22. The curable resin composition according to any of the above items, wherein the condensate comprises a polymer of the compound represented by Formula B1, Formula B2, or Formula B3. Item B23. The curable resin composition according to any of the above items, wherein the condensate comprises a dimer, trimer, or higher polymer of the compound represented by Formula B1, Formula B2, or Formula B3. Item B24. The hardening resin composition of any of the above items, wherein the crosslinking agent has a weight average degree of polymerization of 1.3 to 1.8 for the compound represented by Formula B1, Formula B2, or Formula B3, respectively. Item B25. The hardening resin composition of any of the above items, wherein R ^1b is selected from a substituted or unsubstituted aromatic group, and [Chemical 11] A group of disubstituted amines represented by, R ^2b to R ^13b are independently substituted or unsubstituted alkyl groups, and R ^14b and R ^15b are independently hydrogen. Item B26. A curable resin composition as described in any of the above items, wherein the ratio of the mass of the linear polymer to the mass of the crosslinking agent in the composition is 1:2 to 1:0.03. Item B27. A curable resin composition as described in any of the above items, further comprising an acid catalyst. Item B28. A curable resin composition as described in any of the above items, wherein the acid catalyst is a compound selected from the group consisting of p-toluenesulfonic acid (PTS), dodecylbenzenesulfonic acid, and thermal acid generator San-Aid SI-100L (San-Shin Chemical Industry Co., Ltd.), or a salt thereof or a solvent thereof. Item B29. A curable resin composition as described in any of the above items, which contains a solvent. Item B30. A curable resin film, which is formed by curing the curable resin composition as described in any of the above items. Item B31. An easily peelable curable resin film, which is formed by curing the curable resin composition as described in any of the above items into a film on the surface of a substrate. Item B32. A hardened resin film as described in any of the above items, which has a peeling force of 0.5 N/mm2 or ^less on a sodium glass substrate or an alkali-free glass substrate. Item B33. A hardened resin film as described in any of the above items, which has a peeling force of 0.1 N/ ^mm2 or less on a sodium glass substrate or an alkali-free glass substrate. Item B34. A method for producing a hardened resin film, which is a method for producing a hardened resin film from a hardening resin composition as described in any of the above items, the method comprising: (i) preparing a chain polymer having a side chain with an alcoholic secondary or tertiary hydroxyl group and a crosslinking agent; (ii) coating the hardening resin composition comprising the chain polymer and the crosslinking agent on a substrate to form a hardening resin composition coating; (iii) hardening the hardening resin composition coating by subjecting it to a polymerization reaction to form a hardened resin film. Item B35. The manufacturing method as described in the above item, further comprising (iv) the step of peeling the hardened resin film formed on the substrate from the substrate. Item B36. A method for manufacturing a hardened resin film, which is a method for manufacturing a hardened resin film, the method comprising: (i) the step of preparing a chain polymer having a side chain with an alcoholic secondary or tertiary hydroxyl group and a crosslinking agent; (ii) the step of coating a composition comprising the chain polymer and the crosslinking agent on a substrate to form a hardening resin composition coating; (iii) the step of forming a hardening resin film by subjecting the hardening resin composition coating to a polymerization reaction; herein, (a) The side chain comprises 3 to 30 carbon atoms and comprises at least one saturated or unsaturated hydrocarbon group, or in addition thereto comprises at least one aromatic group, and may comprise a bond selected from the group consisting of -COO-, -O-, and -CO- that connects the carbon atoms of adjacent groups therein; (b) The crosslinking agent is selected from a tri-hydrazide crosslinking agent or a glycoluril crosslinking agent. Item B37. A production method as described in any of the above items, wherein the chain polymer comprises the following monomer units, which are monomer units having the side chain having an alcoholic secondary or tertiary hydroxyl group, and are at least one of a (meth)acrylic acid monomer, a vinyl ester monomer, a vinyl ether monomer, and vinyl monomers other than these. Item B38. A production method as described in any of the above items, wherein the chain polymer comprises a monomer unit selected from the group consisting of _CH2 =CH-COO- ^R1 , _CH2 =C( _CH3 )-COO- ^R2 , _CH2 =CH-O-CO- ^R3 , _CH2 =CH- ^OR4 , and _CH2 =CH- ^R5 (herein, ^R1 , ^R2 , ^R3 , ^R4 , and R5 are ⁵ is composed of monomer units selected from the group consisting of compounds represented by (a) which independently have 3 to 30 carbon atoms including the carbon atom constituting the ester bond when bonded to each vinyl group via an ester bond, have an alcoholic secondary or tertiary hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-. Item B39. A production method as described in any of the above items, wherein the chain polymer further comprises the following additional monomer units, and the additional monomer units are at least one of (meth)acrylic acid monomers, vinyl ester monomers, vinyl ether monomers, and vinyl monomers other than these monomers, which do not have a hydroxyl group and have 1 to 15 carbon atoms in the side chain. Item B40. A production method as described in any of the above items, wherein the additional monomer unit is selected from _CH2 =CH-COO- ^R6 , _CH2 =C( _CH3 )-COO- ^R7 , _CH2 =CH-O-CO- ^R8 (herein, ^R6 , ^R7 , and R8 independently have 1 to 15 carbon atoms, do not have a hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-), CH2=CH-OR9, CH2=CH ^- R10 (herein, R9, and R8 are independently selected from the group consisting of -COO-, -O-, and -CO-), _CH2 =CH- ^OR9 , _CH2 =CH- ^R10 (herein, ^R9 , and R10 are independently selected from the group consisting of -COO-, -O-, and -CO-). ¹⁰ independently have 3 to 15 carbon atoms, have no hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-), C ₄ HO ₃ -R ¹¹ , and C ₄ H ₂ NO ₂ -R ¹² (herein, C ₄ HO ₃ - represents a maleic anhydride group, C ₄ H ₂ NO ₂ - represents a maleic anhydride group, R ¹¹ , and R ¹² is independently a hydrogen atom or has 1 to 15 carbon atoms, has no hydroxyl group, contains at least one saturated or unsaturated hydrocarbon group, or further contains at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-). Item B41. The production method of any of the above items, wherein the ratio of monomer units having alcoholic secondary or tertiary hydroxyl groups in the monomer units constituting the chain polymer is 30 to 100 mol%. Item B42. A production method as described in any of the above items, wherein the crosslinking agent is selected from the group consisting of completely or partially alkoxymethylated melamine, completely or partially alkoxymethylated guanamine, completely or partially alkoxymethylated acetylguanamine, or completely or partially alkoxymethylated benzoguanamine, and completely or partially alkoxymethylated glycoluril. Item B43. A production method as described in any of the above items, wherein the ratio of the mass of the linear polymer in the composition to the mass of the crosslinking agent is 1:2 to 1:0.03. Item B44. A production method as described in any of the above items, wherein the composition contains a solvent. Item B45. A production method as described in any of the above items, wherein the composition further contains an acid catalyst. Item B46. A method for producing a hardened resin film as described in any of the above items, further comprising (iv) a step of peeling the hardened resin film formed on the substrate from the substrate. Item B47. A composition comprising a hardening resin composition or a hardening resin film as described in any of the above items, and used to make a circuit by photolithography. Item B48. A composition comprising a hardening resin composition or a hardening resin film as described in any of the above items, and used to make a sheet-like flexible electrical or electronic circuit component or a flexible display device. Item B49. A composition comprising a hardening resin composition or a hardening resin film as described in any of the above items, and used for synthesizing resins, pills, films, flat sheets, fibers, foaming agents, tubes, rubbers, elastomers, etc., and used for making two-wheeled vehicles (bicycles, motorcycles, etc.), cars, airplanes, trams, ships, rockets, spacecraft, transportation, entertainment, furniture (e.g., dining tables, chairs, desks, shelves, etc.), bedding (e.g., beds, hammocks, etc.), clothing, protective clothing, sports equipment, bathtubs, kitchen utensils, tableware, cooking utensils, containers and packaging materials (food containers, cosmetic containers, cargo containers, trash cans, etc.) etc.), construction (buildings, roads, building parts, etc.), agricultural films, industrial films, water and sewage, coatings, cosmetics, electrical and electronic industries (electrical products, computer parts, printed circuit boards, insulators, conductors, wiring coating materials, power generation components, speakers, microphones, noise cancellers, converters, etc.), optical communication cables, medical materials and instruments (catheters, wires, artificial blood vessels, artificial muscles, artificial organs, dialysis membranes, endoscopes, etc.), small pumps, actuators, robotic materials (sensors used in industrial robots, etc.), energy generation devices and power plants (solar power generation, wind power generation, etc.). Item B50. A composition comprising a hardening resin composition or a hardening resin film as described in any of the above items, and used to make electronic materials, medical materials, health care materials, life science materials, or robotic materials. Item B51. A composition comprising a hardening resin composition or a hardening resin film as described in any of the above items, and used to make materials such as catheters, wires, containers for pharmaceuticals, or tubes. Item B52. A composition comprising a hardening resin composition or a hardening resin film as described in any of the above items, and used for manufacturing automotive parts (body panels, bumpers, rocker panels, side moldings, engine parts, drive parts, transmission parts, control parts, stabilizer parts, suspension-brake parts, brake parts, axle parts, pipes, grooves, wheels, seats, seat belts, etc.). Item B53. A composition comprising a hardening resin composition or a hardening resin film as described in any of the above items, and used for manufacturing automotive anti-vibration materials, automotive coatings, and automotive synthetic resins. Item B54. Use of a hardening resin composition or hardening resin film as described in any of the above items for manufacturing a circuit by photolithography. Item B55. Use of a hardening resin composition or hardening resin film as described in any of the above items for manufacturing a sheet-like flexible electrical or electronic circuit component or a flexible display device. Item B56. Use of a hardening resin composition or hardening resin film as described in any of the above items, which is used for synthetic resins, pills, films, flat sheets, fibers, foaming agents, tubes, rubbers, elastomers, etc., and is used to make two-wheeled vehicles (bicycles, motorcycles, etc.), cars, airplanes, trams, ships, rockets, spacecraft, transportation, entertainment, furniture (e.g., dining tables, chairs, desks, shelves, etc.), bedding (e.g., beds, hammocks, etc.), clothing, protective clothing, sports equipment, bathtubs, kitchen utensils, tableware, cooking utensils, containers and packaging materials (food containers, cosmetic containers, cargo containers, garbage bins, etc.) ), construction (buildings, roads, building parts, etc.), agricultural films, industrial films, water and sewage, coatings, cosmetics, electrical and electronic industries (electrochemical products, computer parts, printed circuit boards, insulators, conductors, wiring coating materials, power generation components, speakers, microphones, noise eliminators, converters, etc.), optical communication cables, medical materials and instruments (catheters, wires, artificial blood vessels, artificial muscles, artificial organs, dialysis membranes, endoscopes, etc.), small pumps, actuators, robotic materials (sensors used in industrial robots, etc.), energy generation devices and power plants (solar power generation, wind power generation, etc.). Item B57. A use of a hardening resin composition or a hardening resin film as described in any of the above items, wherein the hardening resin composition or the hardening resin film is used to produce electronic materials, medical materials, health materials, life science materials, or robotic materials. Item B58. A use of a hardening resin composition or a hardening resin film as described in any of the above items, wherein the hardening resin composition or the hardening resin film is used to produce materials such as catheters, wires, containers for pharmaceuticals, or tubes. Item B59. Use of a hardening resin composition or hardening resin film as described in any of the above items for making automotive parts (body panels, bumpers, rocker panels, side moldings, engine parts, drive parts, transmission parts, control parts, stabilizer parts, suspension-brake parts, brake parts, axle parts, pipes, grooves, wheels, seats, seat belts, etc.). Item B60. Use of a hardening resin composition or hardening resin film as described in any of the above items for making automotive anti-vibration materials, automotive coatings, and automotive synthetic resins. Item B61. A method for manufacturing a circuit by photolithography, comprising a process of forming a hardening resin composition or hardening resin film as described in any of the above items by performing a polymerization reaction. Item B62. A method for manufacturing a sheet-shaped flexible electrical or electronic circuit component or a flexible display device, comprising a process of forming a hardening resin composition or hardening resin film as described in any of the above items by performing a polymerization reaction. Item B63. A method for using synthetic resins, pellets, films, flat sheets, fibers, foaming agents, tubes, rubbers, elastomers, etc., to make two-wheeled vehicles (bicycles, motorcycles, etc.), cars, airplanes, trams, ships, rockets, spacecraft, transportation, entertainment, furniture (e.g., dining tables, chairs, desks, shelves, etc.), bedding (e.g., beds, hammocks, etc.), clothing, protective clothing, sports equipment, bathtubs, kitchen utensils, tableware, cooking utensils, containers and packaging materials (food containers, cosmetic containers, cargo containers, garbage bins, etc.), buildings (buildings, roads, building parts, etc.), agricultural films, industrial films, water pipes, paints, chemicals, etc. Cosmetics, electrical and electronic industries (electrochemical products, computer parts, printed circuit boards, insulators, conductors, wiring coating materials, power generation elements, speakers, microphones, noise cancellers, converters, etc.), optical communication cables, medical materials and instruments (catheters, wires, artificial blood vessels, artificial muscles, artificial organs, dialysis membranes, endoscopes, etc.), small pumps, actuators, robotic materials (sensors used in industrial robots, etc.), energy generating devices and power plants (solar power generation, wind power generation, etc.), and including processes for forming a curable resin composition or a curing resin film as any of the above items by performing a polymerization reaction. Item B64. A method for producing electronic materials, medical materials, health materials, life science materials, or robotic materials, and comprising a process of forming a hardening resin composition or hardening resin film as described in any of the above items by performing a polymerization reaction. Item B65. A method for producing a material such as a catheter, a wire, a container for a pharmaceutical product, or a tube, and comprising a process of forming a hardening resin composition or hardening resin film as described in any of the above items by performing a polymerization reaction. Item B66. A method for producing automobile parts (body panels, bumpers, rocker panels, side moldings, engine parts, drive parts, transmission parts, control parts, stabilizer parts, suspension-brake parts, brake parts, axle parts, pipes, grooves, wheels, seats, seat belts, etc.), and comprising a process of forming a curable resin composition or a curable resin film as described in any of the above items by polymerization. Item B67. A method for producing an anti-vibration material for automobiles, an automobile coating, or an automobile synthetic resin, and comprising a process of forming a curable resin composition or a curable resin film as described in any of the above items by polymerization.

(1) Definitions of Terms In this specification, the term "heat resistance" means that the film obtained by curing the curable resin composition can withstand heating within 150°C, preferably 230°C, without substantially causing decomposition or other degradation. A temperature of 230°C is a high enough temperature to be used as a baking temperature in the manufacture of electronic circuits using photolithography. In this specification, the term "easily peelable film" means that a film formed by coating on a substrate, especially a glass substrate, and curing is easily peeled off from the substrate without damaging the film (i.e., without much effort), and the term "easy peelability" refers to the properties of such a film. As the glass substrate, for example, a sodium glass substrate, an alkali-free glass substrate, and the like are suitable glass substrates. A sodium glass substrate is a particularly preferred example. In this specification, the thickness of the "hardened resin film" is not limited. When used as a base film for circuit manufacturing, the preferred thickness is 200 to 400 nm, for example, about 300 nm. The reason for this is to cope with the current demand for thin film when manufacturing electronic components, rather than the performance of the hardened resin film itself being limited to this thickness range. The thickness of the hardened resin film is arbitrary. In this specification, "hardened resin film" is used with the same meaning as "hardened resin film". In this specification, the term "side chain" in a chain polymer refers to a structural part branching from the main chain, and the so-called "main chain" refers to a chain composed of atoms of repeated monomer units in the structure of the polymer linked in one dimension. Therefore, for example, in the case where the polymer is a polymer of (meth)acrylate, "-COO-" which is a part of each monomer that participates in the formation of ester bonds is included in a part of the "side chain". Furthermore, the expression "(meth)acrylate" refers to acrylate and methacrylate without distinction. Similarly, the expression "(meth)acryl" refers to acryl and methacryl without distinction, and "(meth)acrylic acid" refers to acrylic acid and methacrylic acid without distinction. In this specification, when "-O-" and "-CO-" are mentioned, it does not include the case where they are components of "-COO-". Furthermore, "-COO-" is a description of an ester in which the groups at both ends of the ester are not fixed, and includes both "-COO-" and "-O-CO-". However, when the groups at both ends of the ester are fixed, they are distinguished and used as "-COO-" and "-O-CO-". The so-called "alkyl" in this specification refers to a monovalent group generated by taking a hydrogen atom from an aliphatic hydrocarbon (alkane) such as methane, ethane, and propane, and is generally represented by C _n H _2n+1 - (here, n is a positive integer). The alkyl group can be a straight chain or a branched chain. Examples of the alkyl group having 1 to 4 carbon atoms (C _{1 ~ 4} alkyl) include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, sec-butyl, etc., but the present invention is not limited to these examples. Examples of the alkyl group having 1 to 6 carbon atoms (C _{1 ~ 6} alkyl) include alkyl group having 1 to 4 carbon atoms, tert-butyl, sec-butyl, n-pentyl, isopentyl, n-hexyl, iso-hexyl, cyclohexyl, etc., but the present invention is not limited to these examples. Examples of the alkyl group having 1 to 10 carbon atoms (C _{1 ~ 10} alkyl) include alkyl group having 1 to 6 carbon atoms, n-octyl, n-nonyl, n-decyl, etc., but the present invention is not limited to these examples. The term "alkenyl" as used in this specification refers to a monovalent group generated by abstracting a hydrogen atom from an aliphatic hydrocarbon (olefin) containing at least one double bond, such as ethylene, propylene, and butene, and is generally represented by C _m H _{2m- 1} (here, m is an integer greater than or equal to 2). The alkenyl group may be a straight chain or a branched chain. Examples of alkenyl groups having 2 to 6 carbon atoms include vinyl, 1-propenyl, 2-propenyl, butenyl, pentenyl, hexenyl, etc., but the present invention is not limited to these examples. Examples of alkenyl groups having 2 to 10 carbon atoms include alkenyl groups having 2 to 6 carbon atoms, heptenyl, octenyl, nonenyl, decenyl, etc., but the present invention is not limited to these examples. The term "alkynyl" as used in this specification refers to a monovalent group generated by abstracting a hydrogen atom from an aliphatic hydrocarbon (alkynyl) containing at least one triple bond, such as acetylene, propyne, butyne, and is generally represented by C _m H _2m-3 (where m is an integer greater than 2). The alkynyl group may be a straight chain or a branched chain. Examples of alkynyl groups having 2 to 6 carbon atoms include ethynyl, 1-propynyl, 2-propynyl, butynyl, pentynyl, hexynyl, etc., but the present invention is not limited to these examples. Examples of alkynyl groups having 2 to 10 carbon atoms include alkynyl groups having 2 to 6 carbon atoms, heptynyl, octynyl, nonynyl, decynyl, etc., but the present invention is not limited to these examples. The "alkylene group" mentioned in this specification refers to a divalent group generated by taking two hydrogen atoms from an aliphatic hydrocarbon (alkane) such as methane, ethane, and propane, and is generally represented by -(C _m H _2m )- (here, m is a positive integer). The alkylene group may be a straight chain or a branched chain. Examples of the alkylene group having 1 to 10 carbon atoms include: methylene, ethylene, n-propylene, isopropylene, n-butylene, isobutylene, t-butylene, n-pentylene, n-hexylene, isohexylene, etc., but the present invention is not limited to these examples. Preferably, the alkylene group has 1 to 6 carbon atoms, more preferably, the alkylene group has 1 to 4 carbon atoms, more preferably, the methylene group and the ethylene group, and even more preferably, the ethylene group. The term "alkenyl" as used in this specification refers to a divalent radical generated by abstracting two hydrogen atoms from an aliphatic hydrocarbon (olefin) containing at least one double bond, such as ethenyl, propenyl, and butenyl, and is generally represented by -(C _m H _2m-2 )- (where m is an integer greater than 2). The alkenyl group may be a straight chain or a branched chain. Examples of alkenyl groups having 2 to 10 carbon atoms include ethenyl, n-propenyl, isopropenyl, n-butenyl, isobutenyl, n-pentenyl, n-hexenyl, and isohexenyl, but the present invention is not limited to these examples. Preferred are alkenylene groups having 2 to 6 carbon atoms, more preferred are alkenylene groups having 2 to 4 carbon atoms, further preferred are ethenylene groups and n-propenylene groups, and further preferred are ethenylene groups. The term "alkoxy" as used herein refers to a monovalent group generated by abstracting a hydrogen atom of a hydroxyl group of an alcohol, and is generally represented by C _n H _2n+1 O- (where n is an integer greater than 1). Examples of the alkoxy group having 1 to 6 carbon atoms include methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, tert-butoxy, sec-butoxy, n-pentoxy, isopentoxy, n-hexoxy, isohexoxy, etc., but the present invention is not limited to these examples. The "halogenoalkyl" mentioned in the present specification refers to an alkyl group in which one or more hydrogen atoms on the above alkyl group are replaced by halogen atoms. Moreover, the "perhalogenoalkyl" refers to an alkyl group in which all hydrogen atoms on the above alkyl group are replaced by halogen atoms. Examples of the halogenoalkyl group having 1 to 6 carbon atoms include trifluoromethyl, trifluoroethyl, perfluoroethyl, trifluoro-n-propyl, perfluoro-n-propyl, trifluoroisopropyl, perfluoroisopropyl, trifluoro-n-butyl, perfluoro-n-butyl, trifluoroisobutyl, perfluoroisobutyl, trifluoro-t-butyl, perfluoro-t-butyl, trifluoro-n-pentyl, perfluoro-n-pentyl, trifluoro-n-hexyl, and perfluoro-n-hexyl, but the present invention is not limited to these examples. The term "cycloalkyl" as used herein refers to a monocyclic or polycyclic saturated alkyl group, and also includes a cross-linked structure. For example, the term "C _3-12 cycloalkyl" refers to a cyclic alkyl group having 3 to 12 carbon atoms. As specific examples, in the case of "C _6-12 cycloalkyl", the following can be mentioned: cyclohexyl, cycloheptyl, cyclooctyl, adamantyl, isothioyl, etc. In the case of "C _3-12 cycloalkyl", the following can be mentioned: cyclopropyl, cyclobutyl, cyclopentyl, C _6-12 cycloalkyl, etc. It is preferred to list "C _6-12 cycloalkyl". The "cycloalkenyl" mentioned in this specification refers to a monocyclic or polycyclic unsaturated hydrocarbon group containing a double bond, and also includes a structure formed by cross-linking. Examples of the above-mentioned "cycloalkyl" include those in which one or more carbon bonds are double bonds. For example, the so-called "C _3-12 cycloalkenyl" refers to a cyclic alkenyl group having 3 to 12 carbon atoms. As a specific example, in the case of "C _6-12 cycloalkenyl", the following examples can be cited: 1-cyclohexenyl, 2-cyclohexenyl, 3-cyclohexenyl, cycloheptenyl, cyclooctenyl, cyclononenyl, etc. In the case of "C _3-12 cycloalkyl", examples include: cyclopropenyl, cyclobutenyl, cyclopentenyl, C _6-12 cycloalkenyl, etc. Preferably, "C _6-12 cycloalkenyl" is listed. "Hydrocarbon" as used in this specification refers to a monovalent group generated by taking a hydrogen atom from a compound consisting only of carbon and hydrogen. In addition, hydrogen includes the above-mentioned "alkyl", "alkenyl", "alkylene", "alkenylene", "cycloalkyl", and "cycloalkenyl", as well as the following "aromatic group" and "alicyclic group". Hydrocarbon groups may be saturated or unsaturated. Alkyl groups are classified into chain alkyl groups and cyclic alkyl groups according to the carbon bonding method, and cyclic alkyl groups are further classified into alicyclic alkyl groups and aromatic alkyl groups. Examples of saturated or unsaturated alkyl groups include: methyl, ethyl, n-propyl, isopropyl, butyl, pentyl, hexyl, cyclohexyl, dicyclopentadienyl, decahydronaphthyl, adamantyl, butenyl, hexenyl, cyclohexenyl, decyl, and various linear, branched, monocyclic, and condensed cyclic groups within the range of the carbon atom number of the side chain, but are not limited to these. When these groups are not located at the terminal, they may be divalent or higher depending on the bonding relationship with other groups. The "aromatic group" in the present specification refers to a group generated by the detachment of a hydrogen atom bonded to the ring of an aromatic hydrocarbon. For example, phenyl (C ₆ H ₅ -) is derived from benzene, tolyl (CH ₃ C ₆ H ₄ -) is derived from toluene, xylyl ((CH ₃ ) ₂ C ₆ H ₃ -) is derived from xylene, and naphthyl (C ₁₀ H ₈ -) is derived from naphthalene. In addition, the "heteroaromatic group" in the present specification refers to a monocyclic or polycyclic aromatic group containing a heteroatom, which contains one or more (for example, 1 to 4) heteroatoms of the same or different types selected from nitrogen atoms, sulfur atoms and oxygen atoms. In addition, the above-mentioned "aromatic group" includes "heteroaromatic group". Examples of aromatic groups include carbocyclic aromatic groups (monocyclic groups and condensed ring groups) such as phenyl, biphenyl, naphthyl, etc., and heteroaromatic groups (monocyclic groups and condensed ring groups) such as pyridyl, pyrimidyl, quinolyl, trioxane, etc. Each aromatic group, when not at the terminal, may be a divalent or higher group depending on the bonding relationship with other groups. Furthermore, in this specification, a group having an aromatic ring portion and a saturated or unsaturated hydrocarbon chain portion that together form a ring (for example, tetrahydronaphthyl or dihydronaphthyl) is understood to be a bond between an aromatic group and a saturated or unsaturated hydrocarbon group. The "alicyclic (group)" mentioned in this specification refers to a part (or group) generated by the detachment of one hydrogen atom bonded to a non-aromatic ring composed only of carbon and hydrogen. In addition, the alicyclic group includes the above-mentioned "cycloalkyl" and "cycloalkenyl". The alicyclic group may be saturated or unsaturated. Examples of saturated or unsaturated alicyclic groups include: cyclohexyl, dicyclopentadienyl, decahydronaphthyl, adamantyl, cyclohexenyl, and various monocyclic and condensed cyclic groups within the limit of the number of carbon atoms in the side chain, but are not limited to them. When each of these bases is not located at the terminal, it can be a divalent or higher base according to the bonding relationship with other bases. Usually, the term "(being/being) substituted" refers to the substitution of one or more hydrogen radicals in the structure provided by the free radical of a specific substituent. In this specification, the number of substituents in the base defined by "(being/being) substituted" is not particularly limited as long as it can be substituted, and it can be 1 or plural. In addition, except for the cases where special instructions are given, the description of each base is also suitable for the case where the base is a part of other bases or a substituent. In addition, in this specification, for the substituent that does not specifically indicate the term "(being/being) substituted", it means an "unsubstituted" substituent. Furthermore, in this specification, it can be understood that the sentence "substituted or unsubstituted" can be used interchangeably with the sentence "can be substituted". Examples of substituents on the groups described in the present specification including "substituted alkyl", "substituted alkyl", "substituted alkenyl", "substituted alkynyl", "substituted cycloalkyl", "substituted cycloalkenyl", "substituted alkyl", "substituted aromatic", "substituted heteroaromatic", "substituted alkylene", "substituted alkenylene", "substituted or unsubstituted secondary or tertiary OH-containing group" and "substituted adamantyl" include: halogen, _hydroxyl , C _1-10 alkyl, C _1-10 alkoxy _{, C 2-10} alkenyl _, C _6-12 cycloalkyl _, C _6-12 cycloalkenyl _{, C 1-10} halogenalkyl _, C _2-10 halogenalkenyl _{, C 6-18 alkyl , C 6-18 C 1-18} aromatic _group , _{C 6-18 heteroaromatic} group, _{C 1-10} alkyl group substituted _by C _{6-12 aromatic group} , C _{1-10 alkyl} group substituted by C _{6-12 alkyl group, C 2-10 alkenyl group substituted by C 6-12 aromatic group, C 2-10 alkenyl group substituted by C 6-12 alkyl group , -CN , oxo group ( =} O), -O(CH ₂ ) ₂ O- _, -OC(CH ₃ ) ₂ O-, -OCH ₂ O- _, -O- _, ester group (-COO- or -O-CO-), ester _group substituted by C _{6-12 alkyl group, ester group substituted by C 6-12 aromatic} group, C _{6-18 alkyl} group substituted _by ester group, _{C 1-12} aromatic group substituted by C _6-12 alkyl _{group However ,} the _{present invention is not} limited to _{these examples} . Preferred examples of the substituent include a hydroxyl group, a C _{6 to 18} alkyl group, a C _{1 to 10} alkyl group, a C 1 _to 10 alkyl group substituted with a C _{6 to 12} aromatic group, a C ₁ to ₁₀ alkyl group substituted with a C _{6 to 12} alkyl group, a C _{6 to 18} alkyl group substituted with an ester group, a C 1 _{to 10} alkyl group substituted with an ester group, an ester group (-COO- or -O-CO-), an ester group substituted with a C ₆ to 12 alkyl group, an ester group substituted with a C _{6 to 12} aromatic group, a C _{2 to 10} alkenyl group, a C _{2 to} 10 alkenyl group substituted with a C 6 _{to 12} aromatic group, a C 2 to 12 alkyl group, a C ₁ to 18 alkyl group substituted with an ester group, a C 1 _{to 10} alkyl group substituted with an ester group, an ester group (-COO- or -O-CO-), an ester group substituted with a C _{6 to 12} alkyl group, an ester group substituted with a C _{6 to 12} aromatic group, a C ₂ to 10 alkenyl group, a C ₂ to ₁₂ aromatic group, a C 2 _{to 12} alkyl group, a C _{1 to 10} alkoxy, C _6-12 cycloalkyl, C _6-12 cycloalkenyl, as more specific examples, there can be exemplified benzyloxy, phenyl, cyclohexyl, cyclohexenyl, adamantyl, hydroxyl-substituted adamantyl. The "α-substituted (meth) acrylic monomer" as used herein refers to an acrylic monomer in which the carbon of the double bond adjacent to (α-position) the carbon forming the ester group -COO- is substituted, as shown in _CH2 =C( ^R1a )-COO- ^R1 . Similarly, the so _- called "vinyl ester monomer substituted at the α-position" refers to an acrylic monomer in which the carbon of the double bond adjacent to (α-position) the oxygen of the ester group -O-CO- is substituted as shown in _CH2 =C( ^R1a )-O-CO- ^R3 , the so-called "vinyl ether monomer substituted at the α-position" refers to an acrylic monomer in which the carbon of the double bond adjacent to (α-position) the oxygen of the ether group -O- is substituted as shown in CH2=C( ^R1a ) ^-OR4 , and the so-called "vinyl monomer substituted at the α-position" refers to an acrylic monomer in which the internal carbon other than the terminal carbon of the vinyl group is substituted as shown in _CH2 =C( ^R1a ) ^-R5 . R ¹ , R ³ , R ⁴ , R ⁵ and R ^1a are defined in the following preferred embodiment (2-1) of the curable resin composition. In the present specification, "a group containing a secondary or tertiary OH" means a group containing one or more secondary or tertiary hydroxyl groups (OH). Therefore, "a group containing a secondary or tertiary OH" also includes the secondary or tertiary hydroxyl group itself. "Substituted or unsubstituted" in "a group containing a secondary or tertiary OH which is substituted or unsubstituted" means that a part of the groups other than the hydroxyl group in the group containing one or more secondary or tertiary hydroxyl groups (OH) is substituted or unsubstituted, and does not mean that the hydroxyl group is substituted or unsubstituted. In this specification, unless otherwise specified, "solvent" refers to a compound or a salt thereof that further includes a fixed or non-fixed ratio of a solvent bonded by non-shared intermolecular forces. When the solvent is water, the solvent is a hydrate. In this specification, "or" is used when "at least one or more" of the items listed in the article can be adopted. The same applies to "or". In this specification, when it is clearly stated as "within the range of 2 values", the range also includes the 2 values themselves. Therefore, "X~Y" expressing a range means "above X and below Y". In addition, unless otherwise specified, "weight" and "mass", "weight %" or "wt%" and "mass %" are treated as synonyms, respectively. Unless otherwise specified, the expression "approximately" has a tolerance of 10% and, in the case of a measured value, refers to a numerical value within an arbitrary range obtained by rounding off the digits below the 1st digit of the significant digit or the displayed digit. (2) Description of preferred embodiments The preferred embodiments of the present invention are described below. It should be understood that the embodiments provided below are provided for a better understanding of the present invention, and the scope of the present invention should not be limited to the following descriptions. Therefore, it can be understood that the industry can refer to the descriptions in this manual and make appropriate changes within the scope of the present invention. In addition, it should be understood that the following embodiments of the present invention can be used alone or in combination. (2-1) Curable resin composition In one embodiment, the present invention provides a curable resin composition, which comprises a chain polymer having a side chain having an alcoholic secondary or tertiary hydroxyl group, and a crosslinking agent, wherein (a) the side chain comprises 3 to 30 carbon atoms, and comprises at least one saturated or unsaturated hydrocarbon group, or further comprises at least one aromatic group, and may comprise a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-; (b) the crosslinking agent is selected from the group consisting of trioxane compounds and/or condensates thereof, glycoluril compounds and/or condensates thereof, and imidazolidinone compounds and/or condensates thereof. The curable resin composition of the present invention is cured by heat treatment, so it can also be said to be a thermosetting resin composition. The chain polymer as a constituent element of the curable resin composition of the present invention has a side chain having an alcoholic secondary or tertiary hydroxyl group. In the present invention, the number of carbon atoms contained in the side chain having an alcoholic secondary or tertiary hydroxyl group of the chain polymer is preferably 3 to 30. The number of hydroxyl groups in the side chain having an alcoholic secondary or tertiary hydroxyl group can be 1 or more than 2. The above-mentioned side chain is composed of a saturated or unsaturated hydrocarbon group having at least 1 carbon atom, or further contains at least 1 aromatic group. The side chain may also contain one or more bonds selected from the group consisting of -COO-, -O-, and -CO-. The saturated or unsaturated alkyl group constituting the side chain may, for example, occupy all the carbon atoms of the side chain alone, or may be formed by a plurality of saturated or unsaturated carbon groups mutually linked via bonds selected from the group consisting of -COO-, -O-, and -CO-. When the side chain contains an aromatic group in addition to the saturated or unsaturated alkyl group, the saturated or unsaturated alkyl group and the aromatic group may be directly bonded, or may be linked via a bond selected from the group consisting of -COO-, -O-, and -CO-. In the present invention, in order to maintain the easy peelability of the hardened resin film obtained by coating the hardening resin composition of the present invention on a glass substrate and hardening it to form a film, the alcoholic secondary and tertiary hydroxyl groups in the side chain are the essential determining factors. Furthermore, the alcoholic secondary and tertiary hydroxyl groups in the side chain are preferably bonded to the alicyclic part of the side chain, and the alicyclic part of the side chain is also the essential determining factor for maintaining the easy peelability of the hardened resin film. The chain polymer having such side chains is prepared into a resin composition with a suitable crosslinking agent, especially any one of a trioxane compound and/or its condensate, a glycoluril compound and/or its condensate, or an imidazolidinone compound and/or its condensate, and when cured in the form of a film, a heat-resistant and easily peelable film can be provided. In the present invention, the chain polymer having the side chain having an alcoholic secondary or tertiary hydroxyl group is preferably composed of at least one of unsubstituted or α-substituted (meth) acrylic monomers, unsubstituted or α-substituted vinyl ester monomers, unsubstituted or α-substituted vinyl ether monomers, and unsubstituted or α-substituted vinyl monomers other than the above as monomer units. In the present invention, the chain polymer having the side chain having an alcoholic secondary or tertiary hydroxyl group is preferably composed of at least one of a (meth)acrylic monomer, a vinyl ester monomer, a vinyl ether monomer, and a vinyl monomer other than the above as a monomer unit. Preferably, the monomer unit is a (meth)acrylic monomer, and more preferably, the monomer unit is a methacrylic monomer. Preferably, the chain polymer in the present invention comprises a monomer selected from _CH2 =C( ^R1a )-COO- ^R1 , _CH2 =C( ^R1a )-O-CO- ^R3 , _CH2 =C( ^R1a ) ^-OR4 , and _CH2 =C( ^R1a ) ^-R5 (herein, ^R1 , ^R3 , ^R4 , and R ^{R 1a} is a monomer unit selected from the group consisting of compounds represented by (i) wherein R 1a ^is a monomer unit selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted alkenyl. More preferably, the chain polymer of the present invention comprises a group selected from _CH2 =CH-COO- ^R1 , _CH2 =C( _CH3 )-COO- ^R2 , _CH2 =CH-O-CO- ^R3 , _CH2 =CH- ^OR4 , and _CH2 =CH- ^R5 (herein, ^R1 , ^R2 , ^R3 , ^R4 , and R ⁵ is composed of monomer units from the group consisting of compounds represented by (a) which independently have 3 to 30 carbon atoms, preferably 3 to 25, and more preferably 3 to 20 carbon atoms, including the carbon atoms constituting the ester bonds when bonded to each vinyl group via an ester bond, have an alcoholic secondary or tertiary hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-. In the above, examples of saturated or unsaturated alkyl groups include: methyl, ethyl, n-propyl, isopropyl, butyl, pentyl, hexyl, cyclohexyl, dicyclopentadienyl, decahydronaphthyl, adamantyl, butenyl, hexenyl, cyclohexenyl, decyl, and various linear, branched, monocyclic, and condensed cyclic groups within the range of the carbon number of the side chain, but are not limited thereto. When each of these groups is not at the terminal, it may be a divalent or higher group depending on the bonding relationship with other groups. Examples of aromatic groups include carbocyclic aromatic groups (monocyclic groups and condensed ring groups) such as phenyl, biphenyl, naphthyl, and the like, and heteroaromatic groups (monocyclic groups and condensed ring groups) such as pyridyl, pyrimidyl, quinolyl, trioxane, and the like. Each aromatic group, when not at a terminal, may be a divalent or higher group depending on the bond relationship with other groups. In addition, in the present specification, a group having an aromatic ring portion and a saturated or unsaturated hydrocarbon chain portion that together form a ring (e.g., tetrahydronaphthyl or dihydronaphthyl) is understood to be a bond between an aromatic group and a saturated or unsaturated hydrocarbon group. In the present invention, the alcoholic secondary or tertiary hydroxyl group is a hydroxyl group formed by replacing a hydrogen atom on any secondary or tertiary carbon atom of a saturated or unsaturated alkyl group constituting the above-mentioned side chain. The alcoholic hydroxyl group of the side chain of the chain polymer is preferably a secondary hydroxyl group or a tertiary hydroxyl group, and is further preferably bonded to a part or all of the alicyclic group constituting the above-mentioned side chain. More preferably, the chain polymer in the present invention comprises formula A1: [Chemical 12] (herein, R ^1a is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted alkenyl, L ¹ is selected from the group consisting of a single bond, substituted or unsubstituted alkylene, and substituted or unsubstituted alkenylene, R ^2a , R ^3a , and R ^4a are independently selected from the group consisting of hydrogen and substituted or unsubstituted alkyl, but at least one of R ^2a , R ^3a , and R ^4a is a substituted or unsubstituted secondary or tertiary OH-containing group) The monomer unit represented by Further preferably, the chain polymer of the present invention comprises the following monomer units, wherein in formula A1, R ^1a is selected from the group consisting of hydrogen and substituted or unsubstituted alkyl, L ¹ is selected from the group consisting of a single bond and substituted or unsubstituted alkylene, R ^2a , R ^3a , and R ^4a are independently selected from the group consisting of hydrogen and substituted or unsubstituted alkyl, but at least one of R ^2a , R ^3a , and R ^4a is selected from the group consisting of secondary or tertiary hydroxyl and substituted or unsubstituted alkyl containing secondary or tertiary OH. More preferably, the chain polymer of the present invention comprises the following monomer units, wherein in formula A1, R ^1a is selected from the group consisting of hydrogen and unsubstituted alkyl, L ¹ is selected from the group consisting of a single bond and unsubstituted alkylene, R ^2a , R ^3a , and R ^4a are independently selected from the group consisting of hydrogen and substituted or unsubstituted alkyl, but at least one of R ^2a , R ^3a , and R ^4a is selected from the group consisting of secondary or tertiary hydroxyl and substituted or unsubstituted alkyl containing secondary or tertiary OH, and the other two are independently selected from the group consisting of hydrogen and substituted or unsubstituted alkyl. More preferably, the chain polymer of the present invention comprises formula A2: (Herein, R ^1a is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted alkenyl, L ¹ is selected from the group consisting of a single bond, substituted or unsubstituted alkylene, and substituted or unsubstituted alkenylene, R ^5a to R ^14a are independently selected from the group consisting of hydrogen, hydroxyl, and [Chem. 14] or together form a ring, except that at least one of R ^5a to R ^14a or the substituents of the ring is a hydroxyl group, and R ^15a is selected from the group consisting of substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted cycloalkenyl, substituted or unsubstituted aromatic, and substituted or unsubstituted heteroaromatic groups). Preferably, the chain polymer of the present invention comprises the following monomer units, wherein in formula A2, R ^1a is selected from the group consisting of hydrogen and substituted or unsubstituted alkyl, L ¹ is selected from the group consisting of a single bond and substituted or unsubstituted alkylene, R ^5a to R ^14a are independently selected from the group consisting of hydrogen, hydroxyl, and [Chemical 15] or together form a ring, except that at least one of R ^5a ～R ^14a or the substituent of the ring is a hydroxyl group, and R ^15a is selected from the group consisting of substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted cycloalkenyl, and substituted or unsubstituted aromatic groups. Further preferably, the chain polymer of the present invention comprises the following monomer units, wherein in formula A2, R ^1a is selected from the group consisting of hydrogen and unsubstituted alkyl, L ¹ is selected from the group consisting of a single bond and unsubstituted alkylene, and among R ^5a ～R ^14a , R ^7a is a hydroxyl group, and R ^9a is [Chemical 16] , and the rest is hydrogen, or R ^5a to R ^14a together form a ring substituted with at least one hydroxyl group, and R ^15a is selected from the group consisting of substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted cycloalkenyl, and substituted or unsubstituted phenyl. Furthermore, it is further preferred that the ring substituted with at least one hydroxyl group is an adamantane substituted with at least one hydroxyl group. It is further preferred that the chain polymer of the present invention comprises formula A3: [Chemical 17] (herein, R ^1a is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted alkenyl, L ² is selected from the group consisting of substituted or unsubstituted alkylene, and substituted or unsubstituted alkenylene, R ^16a is selected from the group consisting of substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, and substituted or unsubstituted alkynyl, and R ^17a is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, and substituted or unsubstituted alkynyl) a monomer unit represented by. Preferably, the chain polymer of the present invention comprises the following monomer units, wherein in formula A3, R ^1a is selected from the group consisting of hydrogen and substituted or unsubstituted alkyl, L ² is selected from substituted or unsubstituted alkylene, R ^16a is selected from the group consisting of substituted or unsubstituted alkyl, and R ^17a is selected from the group consisting of hydrogen and substituted or unsubstituted alkyl. More preferably, the chain polymer of the present invention comprises formula A4: [Chemical 18] (Here, R ^1a is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted alkenyl, L ¹ is selected from the group consisting of single bond, substituted or unsubstituted alkylene, and substituted or unsubstituted alkenylene, R ^18a is an adamantyl group substituted with at least one hydroxyl group). Preferably, the chain polymer of the present invention comprises the following monomer units, wherein in formula A4, R ^1a is selected from the group consisting of hydrogen, and substituted or unsubstituted alkylene, L ¹ is selected from the group consisting of single bond, and substituted or unsubstituted alkylene, R ^18a is an adamantyl group substituted with at least one hydroxyl group. The chain polymer comprises formula A5: [Chemical 19] (herein, R ^1a is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted alkenyl, L ¹ is selected from the group consisting of a single bond, substituted or unsubstituted alkylene, and substituted or unsubstituted alkenylene, and R ^19a is selected from the group consisting of substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkyl, and substituted or unsubstituted cycloalkenyl) a monomer unit represented by. It is further preferred that the chain polymer of the present invention comprises the following monomer units, wherein in formula A5, R ^1a is selected from the group consisting of hydrogen and substituted or unsubstituted alkyl, L ¹ is selected from the group consisting of a single bond and substituted or unsubstituted alkylene, and R ^19a is selected from the group consisting of substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkyl, and substituted or unsubstituted cycloalkenyl. It is further preferred that in formula A5, R ^19a is a substituted or unsubstituted adamantyl. It is preferred that in the monomer unit, R ^1a is hydrogen or methyl, and it is further preferred that in the monomer unit, R ^1a is methyl. Preferred side chains of the chain polymer of the present invention having alcoholic secondary or tertiary hydroxyl groups include those shown below. However, any side chain having such a hydroxyl group is sufficient. Therefore, the side chains listed are merely illustrative and are not limited to the following. (1a) AO-CO-type (A represents the remaining part of the side chain, the same below) side chain: 2-hydroxyethoxycarbonyl, 2-hydroxypropoxycarbonyl, 4-(hydroxymethyl)cyclohexylmethoxycarbonyl, 2-hydroxy-3-(cyclohexylcarbonyloxy)propoxycarbonyl, 3-benzyloxy-2-hydroxypropoxycarbonyl, 4-benzyloxy-3-hydroxycyclohexylmethoxycarbonyl, 3-hydroxy-1-adamantyloxycarbonyl, 2-hydroxycyclohexyloxycarbonyl, 4-undecanoyloxy-3-hydroxycyclohexylmethoxycarbonyl, 4-butanoyloxy-3-hydroxycyclohexylmethoxycarbonyl, etc. (2a) A-CO-O-type side chain: 2-hydroxypropylcarbonyloxy, 2-hydroxy-3-(cyclohexylcarbonyloxy)propylcarbonyloxy, 3-benzyloxy-2-hydroxypropylcarbonyloxy, 4-benzyloxy-3-hydroxycyclohexylmethylcarbonyloxy, 3-hydroxy-1-adamantylcarbonyloxy, 2-hydroxycyclohexyloxycarbonyloxy, 4-undecanoyloxy-3-hydroxycyclohexylmethylcarbonyloxy, 4-butanoyloxy-3-hydroxycyclohexylmethylcarbonyloxy, and the like. (3a) AO-type side chain: 2-hydroxypropoxy, 2-hydroxy-3-(cyclohexylcarbonyloxy)propoxy, 3-benzyloxy-2-hydroxypropoxy, 4-benzyloxy-3-hydroxycyclohexylmethoxy, 3-hydroxy-1-adamantyloxy, 2-hydroxycyclohexyloxy, 4-undecanyloxy-3-hydroxycyclohexylmethoxy, 4-butanoyloxy-3-hydroxycyclohexylmethoxy, etc. (4a) Others: 2-hydroxypropyl, 2-hydroxy-3-(cyclohexylcarbonyloxy)propyl, 3-benzyloxy-2-hydroxypropyl, 4-benzyloxy-3-hydroxycyclohexylmethyl, 3-hydroxy-1-adamantyl, 2-hydroxycyclohexyl, 4-undecanoyloxy-3-hydroxycyclohexylmethyl, 4-butanoyloxy-3-hydroxycyclohexylmethyl, etc. Preferred examples of monomers for imparting such side chains to the chain polymer include, but are not limited to, the following. (1b) (meth)acrylates such as 2-hydroxypropyl (meth)acrylate, 2-hydroxy-3-(cyclohexylcarbonyloxy)propyl (meth)acrylate, 3-benzyloxy-2-hydroxypropyl (meth)acrylate, 4-benzyloxy-3-hydroxycyclohexylmethyl (meth)acrylate, 1,3-adamantanediol mono(meth)acrylate, 2-hydroxycyclohexyl (meth)acrylate, 4-undecanoyloxy-3-hydroxycyclohexylmethyl (meth)acrylate, and 4-butyryloxy-3-hydroxycyclohexylmethyl (meth)acrylate. (2b) Vinyl esters such as vinyl 2-hydroxybutyrate, vinyl 2-hydroxy-3-(cyclohexylcarbonyloxy)butyrate, vinyl 3-benzoyloxy-2-hydroxybutyrate, vinyl 4-benzoyloxy-3-hydroxycyclohexyl acetate, vinyl 3-hydroxy-1-adamantyl carboxylate, vinyl 2-hydroxycyclohexylcarboxylate, vinyl 4-undecanoyloxy-3-hydroxycyclohexyl acetate, and vinyl 4-butyryloxy-3-hydroxycyclohexyl acetate. (3b) Vinyl ethers such as 2-hydroxypropyl vinyl ether, 2-hydroxy-3-(cyclohexylcarbonyloxy)propyl vinyl ether, 3-benzyloxy-2-hydroxypropyl vinyl ether, 4-benzyloxy-3-hydroxycyclohexyl methyl vinyl ether, 3-hydroxy-1-adamantyl vinyl ether, 2-hydroxycyclohexyl vinyl ether, 4-undecanoyloxy-3-hydroxycyclohexyl methyl ether and 4-butanoyloxy-3-hydroxycyclohexyl methyl ether. (4b) Vinyl monomers such as 1-penten-4-ol, 4-hydroxy-5-(cyclohexylcarbonyloxy)-1-pentene, 5-benzoyloxy-4-hydroxy-1-pentene, 3-(4-benzoyloxy-3-hydroxycyclohexyl)-1-propene, (3-hydroxy-1-adamantyl)ethylene, (2-hydroxycyclohexyl)ethylene, 3-(4-undecanoyloxy-3-hydroxycyclohexyl)-1-propene, and 3-(4-butanoyloxy-3-hydroxycyclohexyl)-1-propene. (5b) Maleic anhydride and maleimide having any of the above (1a) to (4a) as substituents. The chain polymer of the present invention may be a monomer containing additional monomer units in addition to the monomers having the above-mentioned alcoholic secondary or tertiary hydroxyl groups, and the additional monomer units are at least one of unsubstituted or α-substituted (meth) acrylic monomers, unsubstituted or α-substituted vinyl ester monomers, unsubstituted or α-substituted vinyl ether monomers, and unsubstituted or α-substituted vinyl monomers other than these monomers, which may or may not have a hydroxyl group and have 1 to 15 carbon atoms in the side chain. Such additional monomer units are preferably selected from _CH2 =C( ^R1a )-COO- ^R6 , _CH2 =C( ^R1a )-O-CO- ^R8 (herein, ^R6 and ^R8 independently have 1 to 15 carbon atoms, may or may not have a hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, the hydrocarbon group or aromatic group may have an amine group, and ^R1a is selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, and a substituted or unsubstituted alkenyl group), _CH2 =C( ^R1a ) ^-OR9 , _CH2 =C( ^R1a )-OR9 )-R ¹⁰ (herein, R ⁹ and R ¹⁰ independently have 3 to 15 carbon atoms, may or may not have a hydroxyl group, include at least one saturated or unsaturated alkyl group, or further include at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, the alkyl group or aromatic group may have an amine group, and R ^1a is selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, and a substituted or unsubstituted alkenyl group), C ₄ (R ^1a )O ₃ -R ¹¹ , and C ₄ (R ^1a )HNO ₂ -R ¹² (herein, C ₄ (R ^1a )O ₃ - represents a maleic anhydride group, C ₄ (R ^1a )HNO ₂ - represents a cis-butenediamide group, R ¹¹ and R ¹² are independently a hydrogen atom or have 1 to 15 carbon atoms, may or may not have an alcoholic secondary or tertiary hydroxyl group, contain at least one saturated or unsaturated alkyl group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, the alkyl group or aromatic group may have an amine group, and R ^1a is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted alkenyl). The chain polymer of the present invention may be a monomer containing additional monomer units in addition to the above-mentioned monomers having alcoholic secondary or tertiary hydroxyl groups, and the additional monomer units are at least one of (meth) acrylic monomers, vinyl ester monomers, vinyl ether monomers, and vinyl monomers other than these monomers, which do not have a hydroxyl group and have 1 to 15 carbon atoms in the side chain. Such additional monomer units are preferably selected from _CH2 =CH-COO- ^R6 , _CH2 =C( _CH3 )-COO- ^R7 , _CH2 =CH-O-CO- ^R8 (herein, ^R6 , ^R7 and ^R8 independently have 1 to 15 carbon atoms, have no hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, and the hydrocarbon group or aromatic group may have an amine group), CH2=CH-OR9, CH2=CH-R10 (herein, R9, and R8 are independently selected from the group consisting of -COO-, -O-, and -CO-, and the hydrocarbon group or aromatic group may have an amine group), _CH2 =CH- ^OR9 , _CH2 =CH- ^R10 (herein, ^R9 , and R10 are independently selected from the group consisting of -COO-, -O-, and -CO-, and the hydrocarbon group or aromatic group may have an amine group). ¹⁰ independently have 3 to 15 carbon atoms, have no hydroxyl group, contain at least one saturated or unsaturated alkyl group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, and the alkyl group or aromatic group may have an amine group), C ₄ HO ₃ -R ¹¹ , and C ₄ H ₂ NO ₂ -R ¹² (herein, C ₄ HO ₃ - represents a maleic anhydride group, C ₄ H ₂ NO ₂ - represents a maleic anhydride group, R ¹¹ , and R ¹² are independently hydrogen atoms or have 1 to 15 carbon atoms, do not have alcoholic secondary or tertiary hydroxyl groups, contain at least one saturated or unsaturated alkyl group, or further contain at least one aromatic group, may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, and the alkyl group or aromatic group may have an amine group) The group consisting of compounds represented by. As preferred examples of the above-mentioned monomer unit without a hydroxyl group, the following can be listed, but it is not limited to them. (1) (Meth)acrylate esters such as methyl (meth)acrylate, propyl (meth)acrylate, glycidyl (meth)acrylate, butyl (meth)acrylate, ethoxyethyl (meth)acrylate, pentyl (meth)acrylate, tetrahydrofuranyl (meth)acrylate, cyclohexyl (meth)acrylate, phenyl (meth)acrylate, dicyclopentadienyl (meth)acrylate, octyl (meth)acrylate, benzyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, N,N-dimethylaminopropyl (meth)acrylate, 3,4-epoxycyclohexylmethyl (meth)acrylate, and glycidyl (meth)acrylate. (2) Vinyl esters such as vinyl acetate, vinyl butyrate, vinyl valerate, vinyl hexanoate, vinyl cyclohexanecarboxylate, vinyl benzoate, vinyl cyclopentadienylcarboxylate, and vinyl nonanoate. (3) Vinyl ethers such as propyl vinyl ether, butyl vinyl ether, ethoxyethyl vinyl ether, glycidyl vinyl ether, pentyl vinyl ether, tetrahydrofuranylmethyl vinyl ether, cyclohexyl vinyl ether, phenyl vinyl ether, cyclopentadienyl vinyl ether, octyl vinyl ether, benzyl vinyl ether, 2-(vinyloxy)ethyldimethylamine, 3-(vinyloxy)propyldimethylamine. (4) Ethylene derivatives such as 1-butene, 4-ethoxy-1-butene, 1-pentene, 1-hexene, vinylcyclohexane, styrene, vinyltoluene, 1-nonene, 3-phenylpropylene. (5) Maleic anhydride derivatives such as maleic anhydride, methyl maleic anhydride, butyl maleic anhydride, hexyl maleic anhydride, cyclohexyl maleic anhydride, phenyl maleic anhydride, octyl maleic anhydride. (6) Citric imide derivatives such as citric imide, methyl citric imide, ethyl citric imide, butyl citric imide, hexyl citric imide, cyclohexyl citric imide, phenyl citric imide, benzyl citric imide, octyl citric imide. The chain polymer in the present invention may be a homopolymer of monomer units or a copolymer comprising two or three or more monomer units, provided that at least one of the monomer units in the copolymer is a monomer unit having a side chain having an alcoholic secondary or tertiary hydroxyl group. Preferably, the copolymer comprises at least one monomer unit having a side chain with an alcoholic secondary or tertiary hydroxyl group, and at least one additional monomer unit without a hydroxyl group. In the chain polymer of the present invention, the ratio of the monomer unit having an alcoholic secondary or tertiary hydroxyl group is preferably 30 to 100 mol%, more preferably 50 to 100 mol, more preferably 60 to 100 mol, further preferably 80 to 100 mol, and particularly preferably 90 to 100 mol%. In the present invention, the chain polymer can be produced by using its raw material monomers using a conventional method, such as using a conventional free radical polymerization catalyst such as 2,2'-azobisisobutyronitrile (AIBN) to carry out polymerization reaction. The molecular weight of the chain polymer is usually preferably in the range of 10,000 to 100,000 (measured by gel permeation chromatography), but is not particularly limited to this range. The crosslinking agent in the curable resin composition of the present invention is preferably a triazole crosslinking agent, a glycoluril crosslinking agent, or an imidazolidinone crosslinking agent. More specifically, the crosslinking agent is preferably selected from the group consisting of triazole compounds and/or condensates thereof, glycoluril compounds and/or condensates thereof, and imidazolidinone compounds and/or condensates thereof. Preferred specific examples of such crosslinking agents include: completely or partially alkoxy (e.g., methoxy, ethoxy) methylated melamine and/or its condensate, completely or partially alkoxy (e.g., methoxy, ethoxy) methylated guanamine and/or its condensate, completely or partially alkoxy (e.g., methoxy, ethoxy) methylated acetoguanamine and/or its condensate, completely or partially alkoxymethylated benzoguanamine and/or its condensate, completely or partially alkoxy (e.g., methoxy, ethoxy) methylated glycoluril and/or its condensate, completely or partially alkoxymethylated imidazolidinone and/or its condensate. Here, "alkoxy" preferably has 1 to 4 carbon atoms. More specifically, preferred compounds as such crosslinking agents include, for example, hexamethoxymethylmelamine, hexaethoxymethylmelamine, tetramethoxymethylhydroxymethylmelamine, tetramethoxymethylmelamine, hexabutoxymethylmelamine, tetramethoxymethylguanamine, tetramethoxymethylacetoguanamine, tetramethoxymethylbenzoguanamine, trimethoxymethylbenzoguanamine, tetraethoxymethylbenzoguanamine, tetrahydroxymethylbenzoguanamine, 1,3,4,6-tetrakis(methoxymethyl)glycoluril, 1,3,4,6-tetrakis(butoxymethyl)glycoluril, 4,5-dihydroxy-1,3-dimethoxymethyl-2-imidazolidinone, and 4,5-dimethoxy-1,3-dimethoxymethyl-2-imidazolidinone, but are not limited thereto. In one embodiment, the crosslinking agent is preferably selected from the group consisting of Formula B1: [Chemical 20] (Herein, R ^1b has 1 to 25 carbon atoms and is selected from substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted aromatic, substituted or unsubstituted heteroaromatic, and [Chemical 21] R ^2b to R ^7b independently have 1 to 10 carbon atoms and are selected from the group consisting of substituted or unsubstituted alkyl groups and substituted or unsubstituted alkenyl groups) and/or their condensates. More preferably, the crosslinking agent in the present invention is the following compound and/or its condensate, wherein in formula B1, R ^1b is selected from the group consisting of substituted or unsubstituted alkyl groups, substituted or unsubstituted aromatic groups, and [Chemical 22] The group of disubstituted amines represented by R ^2b ～R ^7b are independently selected from substituted or unsubstituted alkyl groups. In another embodiment, it is preferred that the crosslinking agent is selected from the free formula B2: [Chemical 23] (herein, R ^8b ～R ^11b have 1 to 10 carbon atoms independently and are selected from the group consisting of substituted or unsubstituted alkyl and substituted or unsubstituted alkenyl) and/or its condensate. More preferably, the crosslinking agent in the present invention is the following compound and/or its condensate, wherein in formula B2, R ^8b ～R ^11b are independently selected from substituted or unsubstituted alkyl. In another embodiment, the crosslinking agent is preferably selected from formula B3: [Chemical 24] (herein, R ^12b and R ^13b independently have 1 to 10 carbon atoms and are selected from the group consisting of substituted or unsubstituted alkyl and substituted or unsubstituted alkenyl, R ^14b and R ^15b independently are hydrogen or have 1 to 10 carbon atoms and are selected from the group consisting of substituted or unsubstituted alkyl and substituted or unsubstituted alkenyl) represented by and/or its condensate. More preferably, the crosslinking agent in the present invention is the following compound and/or its condensate, wherein in formula B3, R ^12b and R ^13b independently have substituted or unsubstituted alkyl, R ^14b and R ^15b independently have hydrogen and substituted or unsubstituted alkyl. More preferably, in formula B3, R ^14b and R ^15b are independently hydrogen. As further preferred specific examples of the crosslinking agent in the curable resin composition of the present invention, there can be cited compounds represented by the following structural formula or compounds named below and/or their condensates: [Chemical 25] Trioxane compounds Glycoluril compounds Trioxane compounds Imidazolidinone compounds Hexamethoxymethylmelamine; Hexabutoxymethylmelamine; 1,3,4,6-Tetra(methoxymethyl)glycoluril; 1,3,4,6-Tetra(butoxymethyl)glycoluril; Tetramethoxymethylbenzoguanamine; 4,5-Dihydroxy-1,3-bis(alkoxymethyl)imidazolidin-2-one. As the condensate, it is preferably a polymer of the compounds listed above, and more preferably a dimer, trimer or higher polymer of the compounds listed above. The crosslinking agent in the hardening resin composition of the present invention can be the compounds listed above and their condensates, that is, it can be a mixture of the compound and the polymer of the compound (that is, a dimer, trimer, or higher polymer). From another perspective, the crosslinking agent may have a weight average degree of polymerization greater than 1 and greater than 3 or more for the compound shown above, preferably greater than 1 and less than 1.8, more preferably 1.3 to 1.8, and further preferably 1.5, but is not limited thereto. Furthermore, when the weight average degree of polymerization of the condensate of the compound is 1, it means that the condensate is the compound itself. The weight average degree of polymerization is any value within the above range, preferably 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 3, 4 or more, more preferably 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, and further preferably 1.5. The mass ratio of the chain polymer to the crosslinking agent in the curable resin composition of the present invention is preferably 1:0.03 to 1:2, more preferably 1:0.05 to 1:2, 1:0.05 to 1:1, 1:0.03 to 1:1, further preferably 1:0.09 to 1:1, 1:0.1 to 1:0.5, further preferably 1:0.09 to 1:0.3, 1:0.1 to 1:0.3. In the present invention, the curable resin composition further comprises an acid catalyst. The acid catalyst is included as a polymerization catalyst in the reaction between the monomer unit and the crosslinking agent as needed. The acid catalyst can be appropriately selected and used as a polymerization catalyst. The acid catalyst may be a compound selected from Brünster acid and/or Lewis acid, or a salt thereof or a solvent thereof. Examples of the acid catalyst include, but are not limited to, a compound selected from the group consisting of protonic acids such as dinonylnaphthalene disulfonic acid, dinonylnaphthalene (mono)sulfonic acid, dodecylbenzenesulfonic acid, dodecylbenzenesulfonic acid, p-toluenesulfonic acid (PTS), phosphoric acid, sulfuric acid, and acetic acid, and a thermal acid generator such as San-Aid SI-100L, SI-150L, SI-110L, SI-60L, and SI-80L (San-Aid Chemical Industry Co., Ltd.). Or a salt thereof, or a solvent thereof. Preferably, the acid catalyst is a compound selected from the group consisting of p-toluenesulfonic acid (PTS), dodecylbenzenesulfonic acid, and thermal acid generator San-Aid SI-100L (San-Shin Chemical Industry Co., Ltd.), or a salt thereof, or a solvent thereof. More preferably, the acid catalyst is pyridinium-p-toluenesulfonic acid, p-toluenesulfonic acid, or a hydrate thereof. When the curable resin composition of the present invention further comprises an acid catalyst, the amount of the acid catalyst can be appropriately determined according to the mass ratio of the chain polymer to the crosslinking agent in the curable resin composition. Preferably, the mass ratio of the chain polymer to the crosslinking agent to the acid catalyst in the curable resin composition is preferably 1:0.03:0.05 to 1:2:0.1, more preferably 1:0.05:0.05 to 1:2:0.1, and further preferably 1:0.09:0.05 to 1:1:0.08. In the present invention, the curable resin composition can be diluted with a solvent to an appropriate concentration. That is, in the present invention, the curable resin composition further comprises a solvent. As long as the boiling point is too low or too high, which does not cause problems when the curable resin composition is applied to a substrate such as glass and then dried to form a uniform coating, a conventional aprotic solvent can be appropriately selected for use. For example, propylene glycol monomethyl ether is a suitable solvent, but is not limited to this. Dilution with a solvent is used to facilitate operations such as polymerization of monomers or application of a curable resin composition to which a crosslinking agent or catalyst is added, so there is no particular upper or lower limit to the degree of dilution. (2-2) Cured resin film In one embodiment, the present invention provides a cured resin film formed by curing the curable resin composition of (2-1) above. In another aspect, the present invention provides an easily peelable hardened resin film formed by hardening the hardening resin composition of (2-1) above on a substrate surface into a film-like state. The hardened resin film formed by the hardening resin composition of the present invention has heat resistance in the sense of "heat resistance" mentioned above, and also has easy peelability after heat treatment within the temperature range of heat resistance. Typically, the curable resin composition of the present invention can be formed into a transparent film by coating a solution obtained by dissolving a chain polymer, a crosslinking agent, and an acid catalyst used as needed in a solvent on a glass substrate (preferably sodium calcium glass) and performing a heat treatment (100°C to 230°C for more than 1 minute) to cure the solution, thereby forming an easily peelable curable resin film with a thickness of several hundred nm (preferably a film thickness of about 200 nm to about 300 nm). Although it is not expected to be bound by theory, its mechanism is that the hydroxyl groups of the side chains of the chain polymer and the crosslinking agent are crosslinked by heating, and the hardening shrinkage forms an easily peelable film. [Chemistry 26] As a method for coating the glass substrate, a known coating method can be used. For example, rotary coating, non-rotating coating, die-mouth coating, spray coating, roll coating, screen coating, slit coating, dip coating, and gravure coating can be listed. Preferably, rotary coating is listed. The thin film formed on the substrate in this way can withstand heating within 150°C, and preferably also withstand heating (baking) at 230°C. Furthermore, since it is resistant to the solvent used in the photoresist solution and also tolerates the alkaline developer solution, it can be advantageously used as a resin base film for circuit manufacturing by photolithography. In addition, the thin film formed by the curable resin composition of the present invention is also easily peelable after heating at such a temperature, so even as a thin film, it can be used in a circuit manufacturing process that includes a baking step at a higher temperature than before, which is beneficial to the maintenance of the characteristics of the circuit, and after the circuit is manufactured, it can also be easily peeled off from the substrate without much effort. Therefore, it can be widely used as a base film with excellent characteristics in the manufacture of various sheet-shaped flexible electrical and electronic circuit parts, for example, it can also be used in the manufacture of flexible display devices or touch sensors. The hardened resin film of the present invention can be produced by the method described in the following (3) hardened resin film production method. The peeling force of the hardened resin film of the present invention can be measured, for example, by the following measurement method. Typically, the hardening resin composition of the present invention is prepared in the form of a solution obtained by dissolving a chain polymer, a crosslinking agent, and an acid catalyst used as needed in a solvent and applied to a glass substrate (preferably sodium calcium glass), and is hardened by heat treatment (100°C to 230°C, for more than 1 minute), thereby producing a hardened resin film on the glass substrate. As a measuring device, for example, TENSILON RTG-1310 (A&D Co., Ltd.) is used, and as a load cell, UR-100N-D type is used. A Michelin tape (width 24 mm) is attached to a hardened resin film on a glass substrate, and pulled at a constant speed of 300 mm/min at a peeling angle of 90° relative to the glass substrate, and the force required for peeling (peeling force) is measured using the above-mentioned device. The hardened resin film of the present invention preferably has a peeling force of 0.5 N/mm ² or less on a sodium glass substrate or an alkali-free glass substrate. The hardened resin film of the present invention more preferably has a peeling force of 0.1 N/mm ² or less on a sodium glass substrate or an alkali-free glass substrate. The hardened resin film of the present invention further preferably has a peeling force of 0.09 N/mm ² or less on a sodium glass substrate or an alkali-free glass substrate. The preferred value of the peeling force on a sodium glass substrate is 0.5 N/mm ² or less, 0.4 N/mm ² or less, 0.3 N/mm ² or less, 0.2 N/mm ² or less, 0.1 N/mm ² or less, 0.09 N/mm ² or less, 0.08 N/mm ² or less, 0.07 N/mm ² or less, 0.06 N/mm ² or less, 0.05 N/mm ² or less, 0.04 N/mm ² or less, 0.03 N/mm ² or less, 0.02 N/mm ² or less, or 0.01 N/mm ² or less. The preferred value of the peeling force on the alkali-free glass substrate is 0.5 N/mm ² or less, 0.4 N/mm ² or less, 0.3 N/mm ² or less, 0.2 N/mm ² or less, 0.1 N/mm ² or less, 0.09 N/mm ² or less, 0.08 N/mm ² or less, 0.07 N/mm ² or less, 0.06 N/mm ² or less, 0.05 N/mm ² or less, 0.04 N/mm ² or less, 0.03 N/mm ² or less, 0.02 N/mm ² or less, and 0.01 N/mm ² or less. When the peeling force on the sodium glass substrate or the alkali-free glass substrate is 0.5 N/mm ² or less, the cured resin film can be regarded as having easy peelability. (3) Method for producing a hardened resin film In one embodiment, the present invention provides a method for producing a hardened resin film, which is a method for producing a hardened resin film from the hardening resin composition of the above-mentioned (2-1), and includes: (i) preparing a chain polymer having a side chain with an alcoholic secondary or tertiary hydroxyl group and a crosslinking agent; (ii) coating the hardening resin composition containing the chain polymer and the crosslinking agent on a substrate to form a hardening resin composition coating; and (iii) curing the hardening resin composition coating by subjecting it to a polymerization reaction to produce a hardened resin film. The above-mentioned manufacturing method further includes (iv) the step of peeling the hardened resin film formed on the substrate from the substrate. The above-mentioned manufacturing method is implemented by the method described in the following embodiments and/or the same method known to the industry. In one embodiment, the above-mentioned manufacturing method further includes (i') the step of polymerizing at least one raw material monomer to produce the chain polymer before step (i). As methods for polymerizing monomers, for example, block polymerization, solution polymerization, emulsion polymerization, suspension polymerization, etc. can be listed, but the present invention is not limited to these examples. Among these polymerization methods, block polymerization and solution polymerization are preferred. Furthermore, the polymerization of monomers can be carried out, for example, by free radical polymerization, living free radical polymerization, anionic polymerization, cationic polymerization, addition polymerization, condensation polymerization, and the like. When the monomers are polymerized by solution polymerization, for example, the monomers can be polymerized by adding a polymerization initiator to a solution obtained by stirring the monomers to dissolve in a solvent. Alternatively, the monomers can be polymerized by adding a monomer to a solution obtained by stirring the polymerization initiator to dissolve in a solvent. The solvent is preferably an organic solvent that is compatible with the monomers. When polymerizing the monomers, a chain transfer agent can also be used to adjust the molecular weight. The chain transfer agent can usually be used by mixing with the monomers. Examples of the chain transfer agent include 2-(dodecylthiothiocarbonylthio)-2-methylpropionic acid, 2-(dodecylthiocarbonylthio) propionic acid, 2-(dodecylthiocarbonylthio)-2-methylpropionic acid methyl ester, 2-(dodecylthiocarbonylthio)-2-methylpropionic acid 3-azido-1-propanol ester, 2-(dodecylthiocarbonylthio)-2-methylpropionic acid pentafluorophenyl ester, thiol group-containing compounds such as lauryl mercaptan, dodecyl mercaptan, and thioglycerol, and inorganic salts such as sodium hypophosphite and sodium hydrogen sulfite, but the present invention is not limited to these examples. These chain transfer agents may be used alone or in combination of two or more. The amount of the chain transfer agent is not particularly limited, and generally, it can be about 0.01 to about 10 parts by weight relative to 100 parts by weight of all monomers. When polymerizing the monomers, it is preferred to use a polymerization initiator. Examples of polymerization initiators include: thermal polymerization initiators, photopolymerization initiators, redox polymerization initiators, ATRP (atom transfer radical polymerization) initiators, ICAR (Initiators for Continuous Activator Regeneration) ATRP initiators, ARGET (Activator Regeneration By Electron Transfer) ATRP initiators, RAFT (reversible addition-fragmentation chain transfer polymerization) agents, NMP (polymerization via nitrogen oxides) agents, polymer polymerization initiators, and the like. The polymerization initiators can be used individually or in combination of two or more. Examples of thermal polymerization initiators include azoisobutyronitrile, methyl azoisobutyrate, azobisdimethylvaleronitrile and other azo-based polymerization initiators, benzoyl peroxide, potassium persulfate, ammonium persulfate and other peroxide-based polymerization initiators, but the present invention is not limited to the examples. The polymerization initiators can be used individually or in combination of two or more. When a thermal polymerization initiator is used as the polymerization initiator, the amount of the thermal polymerization initiator is preferably about 0.01 to about 20 parts by weight relative to 100 parts by weight of all monomers. Examples of the photopolymerization initiator include 2-oxoglutaric acid, 1-hydroxycyclohexylphenone, 2-hydroxy-2-methyl-1-phenylpropane-1-one, 2-methyl[4-(methylthio)phenyl]-2-morpholinopropane-1-one, 2,2-dimethoxy-1,2-diphenylethane-1-one, benzophenone, 1-[4-(2-hydroxyethoxy)phenyl]-2-hydroxy-2-methyl-1-propane-1-one, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butane-1-one, and bis(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentylphosphine oxide. However, the present invention is not limited to these examples. The polymerization initiators may be used alone or in combination of two or more. When a photopolymerization initiator is used as the polymerization initiator, the amount of the photopolymerization initiator is preferably about 0.01 to 20 parts by weight based on 100 parts by weight of all monomers. In the present invention, other polymerization initiators that can be used include, for example, redox polymerization initiators such as hydrogen peroxide and iron (II) salts, persulfates and sodium bisulfite, ATRP (atom transfer radical polymerization) initiators using halogenated alkyl groups under metal catalysts, ICAR ATRP initiators or ARGET ATRP initiators using metals and nitrogen-containing ligands, RAFT (reversible addition-fragmentation chain transfer polymerization) agents, NMP (polymerization via nitrogen oxides) agents, high molecular weight azo polymerization initiators containing polydimethylsiloxane units, high molecular weight azo polymerization initiators containing polyethylene glycol units, and the like, but the present invention is not limited to these examples. These polymerization initiators can be used individually or in combination of two or more. When the above-mentioned polymerization initiators are used as polymerization initiators, the amount of the polymerization initiator is generally preferably about 0.01 parts by weight to about 20 parts by weight relative to 100 parts by weight of all monomers. In one embodiment, electron beam polymerization is carried out by irradiating the monomer with an electron beam. There are no particular limitations on the polymerization reaction temperature and environment when the monomer is polymerized. Usually, the polymerization reaction temperature is about 50°C to about 120°C. The environment during the polymerization reaction is preferably an inert gas environment such as nitrogen. In addition, the polymerization reaction time of the monomer varies depending on the polymerization reaction temperature, etc., so it cannot be generalized, and is generally about 3 to 20 hours. In one embodiment, the substrate in step (ii) of the above-mentioned manufacturing method is preferably a glass substrate, more preferably sodium glass (also known as sodium calcium glass) or alkali-free glass (for example, EAGLE-XG, Corning), and more preferably sodium glass. In one embodiment, as a method of applying the curable resin composition to the substrate in step (ii) of the above-mentioned manufacturing method, a known coating method can be used. For example, rotary coating, die nozzle coating, spray coating, roller coating, screen coating, slit coating, dip coating, gravure coating, etc. can be listed, but it is not limited to these. Preferably, the coating can be performed by using a rotary coating. In another embodiment, in step (ii) of the above-mentioned manufacturing method, it is preferred that the composition further comprises an acid catalyst. Although it is not desired to be bound by theory, the reason is that by including the acid catalyst in the coating of the hardening resin composition, the acid catalyst can function as a polymerization catalyst in the polymerization reaction in step (iii) to promote the reaction. Therefore, in another embodiment, step (i) of the above-mentioned manufacturing method further comprises the step of preparing the acid catalyst. In another embodiment, step (iii) of the above-mentioned manufacturing method further comprises the step of heat-treating the coating of the hardening resin composition. The temperature of the heat treatment is preferably 100°C to 230°C, more preferably 150°C to 230°C. The time of the heat treatment is preferably 1 minute or more, more preferably 10 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, etc., but is not limited thereto. The particularly preferred time of the heat treatment is 10 minutes to 2 hours. The hardened resin film produced by the above-mentioned manufacturing method has the characteristics of the hardened resin film of (2-2) above, and can be obtained in the form of an easily peelable film. (4) Applications The hardening resin composition or hardening resin film of the present invention can be used in synthetic resins, pills, films, flat sheets, fibers, foaming agents, tubes, rubbers, elastomers, etc., and can be applied to two-wheeled vehicles (bicycles, motorcycles, etc.), cars, airplanes, trains, ships, rockets, spacecraft, transportation, entertainment, furniture (e.g., dining tables, chairs, desks, shelves, etc.), bedding (e.g., beds, hammocks, etc.), clothing, protective clothing, sports equipment, bathtubs, kitchen utensils, tableware, cooking utensils, containers and packaging materials (food containers, cosmetic containers, cargo containers, garbage bins, etc.), buildings (buildings, roads, etc.), and other applications. , building parts, etc.), agricultural films, industrial films, water and sewage, coatings, cosmetics, electrical and electronic industries (electrochemical products, computer parts, printed circuit boards, insulators, conductors, wiring coating materials, power generation components, speakers, microphones, noise eliminators, converters, etc.), optical communication cables, medical materials and instruments (catheters, wires, artificial blood vessels, artificial muscles, artificial organs, dialysis membranes, endoscopes, etc.), small pumps, actuators, robotic materials (sensors used in industrial robots, etc.), energy generation devices and power plants (solar power generation, wind power generation, etc.), etc. The curable resin composition or the curable resin film of the present invention can be used in electronic materials, medical materials, health materials, life science materials, or robotic materials, etc. The curable resin composition or the curable resin film of the present invention can be used as materials for conduits, wires, containers for pharmaceuticals, tubes, etc. The curable resin composition or the curable resin film of the present invention can be used in automotive parts (body panels, bumpers, lower door panels, side moldings, engine parts, drive parts, transmission parts, operating device parts, stabilizer parts, suspension-brake device parts, brake parts, shaft parts, pipes, grooves, wheels, seats, seat belts, etc.). The polymer of the present invention can be used in automotive anti-vibration materials, automotive coatings, automotive synthetic resins, etc. All contents of the scientific literature, patents, patent applications and other references cited in this specification are cited as references in this specification to the same extent as specifically described. Above, the present invention is described by citing preferred embodiments for easy understanding. Below, the present invention is described based on embodiments, but the above description and the following embodiments are provided only for illustration and are not provided to limit the present invention. Therefore, the scope of the present invention is not limited to the embodiments specifically described in this specification, nor is it limited to the embodiments, but is only limited by the scope of the patent application. Embodiments Below, the present invention is described in more detail with reference to the embodiments, but it is not intended to limit the present invention to such embodiments. Furthermore, embodiments obtained by appropriately combining the technical methods disclosed in each embodiment are also included in the scope of the present invention. 1. Production of a polymer as a constituent of a curable resin composition A polymer as a constituent of a curable resin composition is produced in the following manner. (Production Example 1) Production of polymer A-1 The following formula (1-1) [Chemical 27] 2-Hydroxypropyl methacrylate was used as a monomer, and 100 parts by mass was dissolved in propylene glycol monomethyl ether (PGME) in a 30% by mass ratio. While blowing nitrogen into the obtained solution, the temperature was raised to 80°C, and 5 mol% of 2,2'-azobisisobutyronitrile (AIBN) was added relative to the total amount of monomers, followed by reaction at 80°C for 8 hours to obtain polymer A-1. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and the result was 25,000. (Production Example 2) Production of polymer A-2: The following formula (1-2) [Chemical 28] Polymer A-2 was obtained in the same manner as in Preparation Example 1 except that 3-benzoyloxy-2-hydroxypropyl methacrylate of (1-2) was used as a monomer. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and the result was 22,000. (Preparation Example 3) Preparation of Polymer A-3 The following formula (1-3) [Chemical 29] Polymer A-3 was obtained in the same manner as in Preparation Example 1 except that 4-benzyloxy-3-hydroxycyclohexylmethyl methacrylate was used as a monomer. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and the result was 32,000. (Preparation Example 4) Preparation of Polymer A-4 The following formula (1-4) [Chemical 30] Polymer A-4 was obtained in the same manner as in Preparation Example 1 except that 1,3-adamantanediol monomethacrylate was used as a monomer. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and the result was 18,000. (Preparation Example 5) Preparation of Polymer A-5 The following formula (1-5) [Chemical 31] Polymer A-5 was obtained in the same manner as in Production Example 1 except that 2-hydroxycyclohexyl methacrylate was used as a monomer. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and the result was 36,000. (Production Example 6) Production of Polymer A-6 The following formula (1-6) [Chemical 32] Polymer A-6 was obtained in the same manner as in Production Example 1 except that 2-hydroxyethyl methacrylate was used as a monomer. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and the result was 42,000. (Production Example 7) Production of Polymer A-7 The following formula (1-7) [Chemical 33] Polymer A-7 was obtained in the same manner as in Preparation Example 1 except that 4-(hydroxymethyl)cyclohexyl methacrylate was used as a monomer. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and the result was 18,000. (Preparation Example 8) Preparation of Polymer A-8 2-Hydroxypropyl methacrylate and n-butyl acrylate of formula (1-1) were used as monomers, and 50 parts by mass of each were dissolved in propylene glycol monomethyl ether (PGME) in such a manner that the total amount was 30% by mass. While blowing nitrogen into the obtained solution, the temperature was raised to 80°C, and 5 mol% of 2,2'-azobisisobutyronitrile (AIBN) was added relative to the total amount of monomers, followed by a reaction at 80°C for 8 hours to obtain Polymer A-8. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and found to be 18,000. (Production Example 9) Production of Polymer A-9 Polymer A-9 was obtained in the same manner as in Production Example 8, except that 2-hydroxypropyl methacrylate of the formula (1-1) and methyl methacrylate were used as monomers. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and found to be 25,000. (Production Example 10) Production of Polymer A-10 Polymer A-10 was obtained in the same manner as in Production Example 8, except that 2-hydroxypropyl methacrylate of the formula (1-1) and styrene were used as monomers. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and found to be 22,000. (Production Example 11) Production of Polymer A-11 Polymer A-11 was obtained in the same manner as in Production Example 8 except that 4-benzoyloxy-3-hydroxycyclohexylmethyl methacrylate and dicyclopentadienyl methacrylate of formula (1-3) were used as monomers. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and found to be 35,000. (Production Example 12) Production of Polymer A-12 Polymer A-12 was obtained in the same manner as in Production Example 8 except that 2-hydroxycyclohexyl methacrylate and dicyclopentadienyl methacrylate of formula (1-5) were used as monomers. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and found to be 25,000. (Production Example 13) Production of Polymer A-13 Polymer A-13 was obtained in the same manner as in Production Example 8 except that 2-hydroxyethyl methacrylate of formula (1-6) and butyl acrylate were used as monomers. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and found to be 38,000. (Production Example 14) Production of Polymer A-14 Polymer A-14 was obtained in the same manner as in Production Example 8 except that 2-hydroxyethyl methacrylate of formula (1-6) and methyl methacrylate were used as monomers. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and found to be 36,000. (Production Example 15) Production of Polymer A-15 Polymer A-15 was obtained in the same manner as in Production Example 8 except that 2-hydroxyethyl methacrylate and dicyclopentadienyl methacrylate of formula (1-6) were used as monomers. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and the result was 39,000. (Production Example 16) Production of Polymer A-16 The following formula (1-8) [Chemical 34] Polymer A-16 was obtained in the same manner as in Preparation Example 1 except that 4-(4-methoxyphenylpropionyl)oxy-3-hydroxycyclohexylmethyl methacrylate was used as a monomer. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and the result was 27,700. (Preparation Example 17) Preparation of polymer A-17 The following formula (1-9) [Chemical 36] Polymer A-17 was obtained in the same manner as in Preparation Example 1 except that 4-adamantanylcarboxyloxy-3-hydroxycyclohexylmethyl methacrylate was used as a monomer. [Chemical 37] The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and found to be 31,700. (Production Example 18) Production of Polymer A-18 Polymer A-18 was obtained in the same manner as in Production Example 8 except that 2-hydroxycyclohexyl methacrylate of formula (1-5) and methyl methacrylate were used as monomers. [Chemical 38] The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and the result was 25,500. (Preparation Example 19) Preparation of polymer A-19 The following formula (1-10) [Chemical 39] Polymer A-19 was obtained in the same manner as in Preparation Example 1 except that 2-methacrylate-3-hydroxybenzoylmethyl ester was used as a monomer. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and the result was 35,700. (Preparation Example 20) Preparation of polymer A-20 The following formula (1-11) [Chemical 41] Polymer A-20 was obtained in the same manner as in Preparation Example 1 except that 2-hydroxy-4-methylacryloyloxymethyl-cyclohexyl-3-cyclohexene-1-carboxylate was used as a monomer. [Chemical 42] The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and the result was 26,700. (Production Example 21) Production of polymer A-21 The following formula (1-12) [Chemical 43] Polymer A-21 was obtained in the same manner as in Preparation Example 1 except that 2-methacrylic acid 4-(2-cyclohexylacetyl)oxy-3-hydroxycyclohexanemethyl ester was used as a monomer. The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and found to be 30,700. (Production Example 22) Production of Polymer A-22 Polymer A-22 was obtained in the same manner as in Production Example 8 except that 2-hydroxycyclohexyl methacrylate of formula (1-5) and benzyl methacrylate were used as monomers. [Chemical 45] The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and was found to be 32,700. (Production Example 23) Production of Polymer A-23 4-(4-methoxyphenylpropionyl)oxy-3-hydroxycyclohexylmethyl methacrylate of formula (1-8) and [Chemical 46] of formula (1-13) were reacted with 3,4-Epoxyhexylmethyl methacrylate was used as a monomer, and 100 parts by mass of it was dissolved in propylene glycol monomethyl ether (PGME) in a manner of 20% by mass. While blowing nitrogen into the obtained solution, the temperature was raised to 80°C, and 4 mol% of 2,2'-azobisisobutyronitrile (AIBN) was added relative to the total amount of monomers, and then the reaction was carried out at 80°C for 8 hours to obtain a polymer. Thereafter, 99 parts by mass of 4-methoxycinnamic acid and 1 part by mass of methacrylic acid were added, and then 3 mol% of tetraethylammonium bromide was added, and while blowing air, the temperature was raised to 100°C, and the reaction was carried out for 38 hours to obtain a polymer A-23. [Chemical 47] The average molecular weight (MW) of the obtained polymer was measured by gel permeation chromatography and the result was 42,900. (Production Example 24) Production of Polymer A-24 Polymer A-24 was obtained in the same manner as in Production Example 8 except that methyl methacrylate, glycidyl methacrylate and dicyclopentadienyl methacrylate were used as monomers. [Chemical 48] The average molecular weight (MW) of the polymer was measured by gel permeation chromatography and the result was 35,700. 2. Preparation of curable resin composition The curable resin composition of the present invention was prepared as shown below, applied on two glass substrates and cured by heating to form a film. (Example 1) 4.4 parts by weight of polymer A-1 and the following formula (B-1) [Chemical 49] as a crosslinking agent were added. 0.4 parts by weight of hexamethoxymethylmelamine (NIKALAC MW-30, Sanwa Chemical Co., Ltd.) and 0.2 parts by weight of pyridinium-p-toluenesulfonic acid as a polymerization catalyst were dissolved in 95 parts by weight of propylene glycol monomethyl ether (PGME). The solution was applied to 0.7 mm thick sodium glass and 0.5 mm thick alkali-free glass (EAGLE-XG, Corning) by spin coating, and then heated at 150°C or above for 30 minutes to form a film with a thickness of about 300 nm. (Example 2) 3.2 parts by mass of polymer A-1, 0.8 parts by mass of hexamethoxymethylmelamine (Formula (B-1)), a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst were dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1, and heat-treated to form a film with a thickness of about 300 nm. (Example 3) 2.4 parts by mass of polymer A-1, 2.4 parts by mass of hexamethoxymethylmelamine (Formula (B-1)), a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst were dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1, and then heat-treated to form a film with a thickness of about 300 nm. (Example 4) 4.4 parts by mass of polymer A-2, 0.4 parts by mass of hexamethoxymethylmelamine (Formula (B-1)) as a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst were dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1, and then heat-treated to form a film with a thickness of about 300 nm. (Example 5) 4.4 parts by mass of polymer A-3, 0.4 parts by mass of hexamethoxymethylmelamine (Formula (B-1)), a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst are dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution is applied to sodium glass and alkali-free glass in the same manner as in Example 1, and heat-treated to form a film with a thickness of about 300 nm. (Example 6) 4.4 parts by mass of polymer A-4, 0.4 parts by mass of hexamethoxymethylmelamine (Formula (B-1)), a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst are dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1, and then heat-treated to form a film with a thickness of about 300 nm. (Example 7) 4.4 parts by mass of polymer A-5, 0.4 parts by mass of hexamethoxymethylmelamine (Formula (B-1)) as a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst were dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1, and then heat-treated to form a film with a thickness of about 300 nm. (Example 8) 4.4 parts by mass of polymer A-8, 0.4 parts by mass of hexamethoxymethylmelamine (Formula (B-1)), a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst are dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution is applied to sodium glass and alkali-free glass in the same manner as in Example 1, and heat-treated to form a film with a thickness of about 300 nm. (Example 9) 4.4 parts by mass of polymer A-9, 0.4 parts by mass of hexamethoxymethylmelamine (Formula (B-1)), a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst are dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1, and then heat-treated to form a film with a thickness of about 300 nm. (Example 10) 4.4 parts by mass of polymer A-10, 0.4 parts by mass of hexamethoxymethylmelamine (Formula (B-1)) as a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst were dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1, and then heat-treated to form a film with a thickness of about 300 nm. (Example 11) 4.4 parts by mass of polymer A-11, 0.4 parts by mass of hexamethoxymethylmelamine (Formula (B-1)), a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst are dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution is applied to sodium glass and alkali-free glass in the same manner as in Example 1, and heat-treated to form a film with a thickness of about 300 nm. (Example 12) 4.4 parts by mass of polymer A-12, 0.4 parts by mass of hexamethoxymethylmelamine (Formula (B-1)), a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst are dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1 and heat treated to form a film with a thickness of about 300 nm. (Example 13) 4.4 parts by weight of polymer A-1 and as a crosslinking agent, the following formula (B-2): [Chemical 50] 0.4 parts by weight of 1,3,4,6-tetrakis(methoxymethyl)glycoluril (NIKALAC MW-270, Sanwa Chemical Co., Ltd.) and 0.2 parts by weight of pyridinium-p-toluenesulfonic acid as a polymerization catalyst were dissolved in 95 parts by weight of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1 and heat-treated to form a film with a thickness of about 300 nm. (Example 14) 4.4 parts by weight of polymer A-1 and the following formula (B-3) as a crosslinking agent [Chemical 51] 0.4 parts by mass of tetramethoxymethylbenzoguanamine as a polymerization catalyst and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst are dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution is applied to sodium glass and alkali-free glass in the same manner as in Example 1, and heat-treated to form a film with a thickness of about 300 nm. (Example 15) 4.4 parts by mass of polymer A-1, 0.4 parts by mass of hexamethoxymethylmelamine (Formula (B-1)) as a crosslinking agent, and 0.2 parts by mass of dodecylbenzenesulfonic acid as a polymerization catalyst are dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution is applied to sodium glass and alkali-free glass in the same manner as in Example 1, and heat-treated to form a film with a thickness of about 300 nm. (Example 16) 4.4 parts by weight of polymer A-1, 0.4 parts by weight of crosslinking agent hexamethoxymethylmelamine (Formula (B-1)), and 0.2 parts by weight of thermal acid generator San-Aid SI-100L (San-Shin Chemical Industry Co., Ltd.) as a polymerization catalyst were dissolved in 95 parts by weight of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1 and heat-treated to form a film with a thickness of about 300 nm. (Comparative Example 1) 4.4 parts by mass of polymer A-6, 0.4 parts by mass of hexamethoxymethylmelamine (Formula (B-1)) as a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst were dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1 and heat-treated to form a film with a thickness of about 300 nm. (Comparative Example 2) 4.4 parts by mass of polymer A-7, 0.4 parts by mass of hexamethoxymethylmelamine (Formula (B-1)) as a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst were dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1, and then heat-treated to form a film with a thickness of about 300 nm. (Comparative Example 3) 4.4 parts by mass of polymer A-13, 0.4 parts by mass of hexamethoxymethylmelamine (Formula (B-1)) as a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst were dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1, and then heat-treated to form a film with a thickness of about 300 nm. (Comparative Example 4) 4.4 parts by mass of polymer A-14, 0.4 parts by mass of hexamethoxymethylmelamine (Formula (B-1)) as a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst were dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1 and heat-treated to form a film with a thickness of about 300 nm. (Comparative Example 5) 4.4 parts by mass of polymer A-15, 0.4 parts by mass of hexamethoxymethylmelamine (Formula (B-1)) as a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst were dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1, and then heat-treated to form a film with a thickness of about 300 nm. (Comparative Example 6) 4.4 parts by mass of polymer A-1, 0.4 parts by mass of Duranate TPA-100 (Asahi Kasei Corporation) as an isocyanurate crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst were dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1, and then heat-treated to form a film with a thickness of about 300 nm. (Example 17) 3.2 parts by mass of polymer A-16, 0.8 parts by mass of hexamethoxymethylmelamine (Formula (B-1)), a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst are dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution is applied to sodium glass and alkali-free glass in the same manner as in Example 1, and heat-treated to form a film with a thickness of about 300 nm. (Example 18) 3.2 parts by mass of polymer A-17, 0.8 parts by mass of hexamethoxymethylmelamine (Formula (B-1)), a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst are dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1, and then heat-treated to form a film with a thickness of about 300 nm. (Example 19) 3.2 parts by mass of polymer A-18, 0.8 parts by mass of hexamethoxymethylmelamine (Formula (B-1)) as a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst were dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1, and then heat-treated to form a film with a thickness of about 300 nm. (Example 20) 3.2 parts by mass of polymer A-19, 0.8 parts by mass of hexamethoxymethylmelamine (Formula (B-1)), a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst are dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution is applied to sodium glass and alkali-free glass in the same manner as in Example 1, and heat-treated to form a film with a thickness of about 300 nm. (Example 21) 3.2 parts by mass of polymer A-20, 0.8 parts by mass of hexamethoxymethylmelamine (Formula (B-1)), a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst are dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1, and then heat-treated to form a film with a thickness of about 300 nm. (Example 22) 3.2 parts by mass of polymer A-21, 0.8 parts by mass of hexamethoxymethylmelamine (Formula (B-1)) as a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst were dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1, and then heat-treated to form a film with a thickness of about 300 nm. (Example 23) 3.2 parts by mass of polymer A-22, 0.8 parts by mass of hexamethoxymethylmelamine (Formula (B-1)), a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst are dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution is applied to sodium glass and alkali-free glass in the same manner as in Example 1, and heat-treated to form a film with a thickness of about 300 nm. (Example 24) 3.2 parts by mass of polymer A-23, 0.8 parts by mass of hexamethoxymethylmelamine (Formula (B-1)), a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst are dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1, and then heat-treated to form a film with a thickness of about 300 nm. (Comparative Example 7) 3.2 parts by mass of polymer A-24, 0.8 parts by mass of hexamethoxymethylmelamine (Formula (B-1)) as a crosslinking agent, and 0.2 parts by mass of pyridinium-p-toluenesulfonic acid as a polymerization catalyst were dissolved in 95 parts by mass of propylene glycol monomethyl ether (PGME). The solution was applied to sodium glass and alkali-free glass in the same manner as in Example 1, and then heat-treated to form a film with a thickness of about 300 nm. 3. Performance Evaluation (1) Evaluation of the Peeling Force of Cured Resin Films For the cured resin films produced on the glass substrates in each of the above-mentioned embodiments and comparative examples, the magnitude of the force (peeling force) required to peel the cured resin films from the glass substrates was quantitatively evaluated by the method described below. That is, TENSILON RTG-1310 (A&D Co., Ltd.) was used as a measuring device, and UR-100N-D was used as a load cell. The measurement was performed in the following manner: a Michelin tape (width 24 mm) was attached to a hardened resin film on a glass substrate, and it was pulled at a fixed speed of 300 mm/min at a peeling angle of 90° relative to the glass substrate, and the force required for peeling (peeling force) was measured using the above-mentioned device. The results are shown in Table 1. The peeling forces of Examples 1 to 16 in Tables 1 and 2 are displayed to 3 decimal places. In principle, the measured values and calculated values other than these are displayed to 2 decimal places. [Table 1] As shown in Table 1, it is found that the peeling force of the hardened resin films of Comparative Examples 1 to 6 is 2.2 to 8.7 N/mm ² (sodium glass substrate) and 3.2 to 9.2 N/mm ² (EAGLE-XG substrate), while the peeling force of Examples 1 to 16 is less than two digits, 0.013 to 0.078 N/mm ² (sodium glass substrate) and 0.028 to 0.085 N/mm ² (EAGLE-XG substrate). In fact, it is found that the films or substrates are damaged due to the high peeling force values of the hardened resin films of the Comparative Examples, while the hardened resin films of the Examples can be easily peeled without much effort. (2) Evaluation of the peeling force of the cured resin film after baking It is assumed that a baking process is performed when a circuit is made on the cured resin film by patterning using a photolithography method or a printing method, and the peeling force when the cured resin film is baked is measured. That is, for Examples 1 and 7 and Comparative Examples 1 and 2, the cured resin film formed on the sodium glass substrate is baked at 230°C for 1 hour or 3 hours, and the peeling force of each is measured by the device and method described in (1) above. The results are shown in Table 2 together with the values of the peeling force (initial peeling force) before baking in these Examples and Comparative Examples. [Table 2] As shown in Table 2, the hardened resin films of Examples 1 and 7 after being baked at 230°C for 1 hour or 3 hours were still two digits lower than those of Comparative Examples 1 and 2 before baking, and could be easily peeled off without much effort. The hardened resin films of Comparative Examples 1 and 2 were more firmly attached to the glass substrate than before baking. Assuming that the baking process was performed in the same manner as in (2) above by patterning on the hardened resin film using photolithography or printing, the peeling force when the hardened resin film was baked was measured. That is, for Examples 12, 16 to 22 and Comparative Example 7, the hardened resin film formed on the sodium glass substrate was baked at 230°C for 20 minutes, and the peeling force of each was measured by the apparatus and method described in (1) above. The results are shown in Table 3 together with the values of the peeling force (initial peeling force) before baking in these Examples and Comparative Examples. [Table 3] As shown in Table 3, the hardened resin films of Examples 12 to 24 after being baked at 230°C for 20 minutes were also two digits lower than that of Comparative Example 7 before baking, and could be easily peeled off without much effort. On the other hand, the hardened resin film of Comparative Example 7 had a high peeling force as before baking, and could not be easily peeled off. (3) Evaluation of the peeling force of the cured resin film after baking when the crosslinking agent and the mixing ratio were changed The crosslinking agent and the mixing ratio of polymer/crosslinking agent were changed as shown in Table 5 below, and the peeling force of the cured resin film produced in Examples 25 to 27 and Comparative Examples 8 to 10 was measured. The various conditions are as follows. <Evaluation conditions> ・Substrate: Sodium glass (coated on the tin-treated surface) ・Film formation: Spin coating, baking at >150℃ or 230℃ for 30 minutes ※Final film thickness 50 to 200 nm ・Peeling test conditions: Peeling test was performed using Michelbon tape (width 24 mm). The polymer used is polymer A-3. The crosslinking agent used is shown in Table 4. In Table 4, MW-30 is hexamethoxymethyl melamine (NIKALAC MW-30, Sanwa Chemical Co., Ltd.) of the above formula (B-1), MW-30LF is hexamethoxymethyl melamine (low free formaldehyde product) (NIKALAC MW-30LF, Sanwa Chemical Co., Ltd.), and MX-270 is 1,3,4,6-tetrakis (methoxymethyl) glycoluril (NIKALAC MW-270, Sanwa Chemical Co., Ltd.) of the above formula (B-2). [Table 4] <img wi="120"he="86"file="IMG-2/Draw/02_image103.jpg"img-format="jpg"><imgwi="125"he="84"file="IMG-2/Draw/02_image105.jpg"img-format="jpg"><imgwi="110"he="76"file="IMG-2/Draw/02_image107.jpg"img-format="jpg"> The results are shown in Table 5. MW-30 was used as a reference compound, and the peeling force and peeling characteristics were studied by changing the mixing ratio of other compounds (Examples 25 to 27 and Comparative Examples 8 to 10). In Table 5, in the peeling test column, "0" means that the formed hardened resin film can be easily peeled off without much effort and has easy peeling properties, and "×" means that it cannot be easily peeled off and does not have easy peeling properties. [Table 5] As shown in Table 5, when MW-30 is used, if the mixing ratio of polymer/crosslinking agent is 45/50, the peeling force is low, 0.02, and it is easy to peel, but when it is 90/10, the peeling force is also double-digit, 7.5, and it is not easy to peel. When MX-270 is used, the peeling force and easy peeling are lower in the mixing ratio of 45/50 and 90/10. On the other hand, with respect to MW-30LF, the peeling force is higher in the mixing ratio of 45/50 and 90/10, and it is not easy to peel. The reason for this result is believed to be that MW-30LF contains less formaldehyde and has fewer hydroxymethyl groups (reaction points for thermal crosslinking) than MW-30. (4) Study on the threshold of peeling force of hardened resin film The peeling force of hardened resin films prepared by varying the weight ratio (wt%) of polymer, crosslinking agent, and acid catalyst was measured. That is, for Examples 28 to 38 and Comparative Examples 11 to 15, a solution prepared by using a polymer, a crosslinking agent, and an acid catalyst in the weight ratio described in Table 6 below was applied to a sodium glass substrate and baked at 230°C for 20 minutes. In addition, a hardened resin film was formed in the same manner as in Example 1, and the peeling force of each was measured and compared by the apparatus and method described in (1) above. The results are shown in Table 6. [Table 6] As shown in Table 6, for crosslinking agent B-1, easy stripping was exhibited when the total amount of polymer, crosslinking agent, and acid catalyst was 10 wt % or more (Examples 28 to 30), and for crosslinking agent B-2, easy stripping was exhibited when the total amount was 3 wt % or more (Examples 33 to 38). In addition, in Comparative Example 8 in Table 5, if the mixing ratio of polymer/crosslinking agent was 90/10, easy stripping was not exhibited, but if the mixing ratio was 85/10 in Example 29 in Table 6, which was approximately the same as the mixing ratio using an acid catalyst, easy stripping was exhibited. Therefore, it can be said that easy stripping is easily exhibited by adding an acid catalyst. As described above, the present invention is illustrated using the preferred embodiments of the present invention, but it should be understood that the scope of the present invention is interpreted only according to the scope of the patent application. It should be understood that the contents of the patents, patent applications and other documents cited in this specification are themselves specifically described in this specification, and similarly, their contents should be cited as references to this specification. This case claims priority to International Patent Application PCT/JP2016/074180 (filed on August 19, 2016) and Taiwan Patent Application No. 105126494 (filed on August 19, 2016), and the contents of the same are cited in this specification as a reference in their entirety. [Industrial Applicability] The present invention is a curable resin composition that can be applied very thinly on a substrate such as glass, and can be dried and cured after application to form an extremely thin curable resin film. During baking in the process of making a circuit on the film by patterning, etc., the film has durability against high temperatures of 230°C, and can be easily peeled off from the substrate even after exposure to such high temperatures. The curable resin composition is useful in the manufacture of film-type electrical and electronic circuit components.

Claims (45)

A curable resin composition comprises a chain polymer having a side chain with an alcoholic secondary or tertiary hydroxyl group and a crosslinking agent, wherein (a) the side chain comprises 3 to 30 carbon atoms and comprises at least one saturated or unsaturated hydrocarbon group, or further comprises at least one aromatic group, and may comprise a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-; and (b) the crosslinking agent is selected from the formula B1:

(Herein, R ^1b has 1 to 25 carbon atoms and is selected from substituted or unsubstituted aromatic groups, and

R ^2b to R ^7b independently have 1 to 10 carbon atoms and are substituted or unsubstituted alkyl) and/or its condensate, formula B2:

(herein, R ^8b to R ^11b independently have 1 to 10 carbon atoms and are substituted or unsubstituted alkyl) and/or its condensate, and formula B3:

(herein, R ^12b and R ^13b independently have 1 to 10 carbon atoms and are substituted or unsubstituted alkyl groups, and R ^14b and R ^15b independently have 1 to 10 carbon atoms and are substituted or unsubstituted alkyl groups) and/or their condensates; the chain polymer comprises formula A2:

(Herein, R ^1a is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted alkenyl; L ¹ is selected from the group consisting of a single bond, substituted or unsubstituted alkylene, and substituted or unsubstituted alkenylene; R ^5a to R ^14a are independently selected from the group consisting of hydrogen, hydroxyl, and

wherein at least one of R ^5a to R ^14a is a hydroxyl group, and R ^15a is selected from the group consisting of substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted cycloalkenyl, substituted or unsubstituted aromatic, and substituted or unsubstituted heteroaromatic groups; wherein the chain polymer comprises L ¹ being a single bond, R ^5a being a hydroxyl group, R ^6a to R When ^14a is a monomer unit represented by formula A2 of hydrogen, the crosslinking agent is not a compound represented by formula B1 and/or its condensate, and the ratio of monomer units having alcoholic secondary or tertiary hydroxyl groups in the monomer units constituting the chain polymer is 30-100 mol%. The hardening resin composition of claim 1, wherein the chain polymer comprises formula A5:

(herein, R ^1a and L ¹ are as defined in claim 1, and R ^19a is selected from the group consisting of substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkyl, and substituted or unsubstituted cycloalkenyl). The hardening resin composition of claim 2, wherein R ^19a is a substituted or unsubstituted adamantyl group. The hardening resin composition according to any one of claims 1 to 3, wherein R ^1a is hydrogen or methyl. A curable resin composition as claimed in any one of claims 1 to 3, wherein the chain polymer further comprises the following additional monomer units, wherein the additional monomer units are at least one of unsubstituted or α-substituted (meth) acrylic monomers, unsubstituted or α-substituted vinyl ester monomers, unsubstituted or α-substituted vinyl ether monomers, and unsubstituted or α-substituted vinyl monomers other than these monomers, which may or may not have a hydroxyl group and have 1 to 15 carbon atoms in the side chain. The curable resin composition of claim 5, wherein the additional monomer unit is selected from _CH2 =C( ^R1a )-COO- ^R6 , _CH2 =C( ^R1a )-O-CO- ^R8 (herein, ^R6 and ^R8 independently have 1 to 15 carbon atoms, may or may not have a hydroxyl group, and include at least one saturated or unsaturated hydrocarbon group, or further include at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, the hydrocarbon group or aromatic group may have an amine group, and ^R1a is selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, and a substituted or unsubstituted alkenyl group), _CH2 =C( ^R1a ) ^-OR9 , CH ₂ =C(R ^1a )-R ¹⁰ (herein, R ⁹ and R ¹⁰ independently have 3 to 15 carbon atoms, may or may not have a hydroxyl group, and include at least one saturated or unsaturated alkyl group, or further include at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, the alkyl group or aromatic group may have an amine group, and R ^1a is selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, and a substituted or unsubstituted alkenyl group), C ₄ (R ^1a )O ₃ -R ¹¹ , and C ₄ (R ^1a )HNO ₂ -R ¹² (herein, C ₄ (R ^1a )O ₃ - represents an unsubstituted or substituted maleic anhydride group, C ₄ (R ^1a )HNO ₂ - represents an unsubstituted or substituted maleic anhydride group, R ¹¹ and R ¹² are independently a hydrogen atom or have 1 to 15 carbon atoms, may or may not have a hydroxyl group, and include at least one saturated or unsaturated alkyl group, or further include at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, the alkyl group or aromatic group may have an amine group, and R ^1a is selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, and a substituted or unsubstituted alkenyl group). A curable resin composition as claimed in any one of claims 1 to 3, wherein the chain polymer further comprises the following additional monomer units, wherein the additional monomer units are at least one of (meth)acrylic monomers, vinyl ester monomers, vinyl ether monomers, and vinyl monomers other than these monomers, which do not have a hydroxyl group and have 1 to 15 carbon atoms in the side chain. The curable resin composition of claim 5, wherein the additional monomer unit is selected from _CH2 =CH-COO- ^R6 , _CH2 =C( _CH3 )-COO- ^R7 , _CH2 =CH-O-CO- ^R8 (herein, ^R6 , ^R7 and ^R8 independently have 1 to 15 carbon atoms, have no hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, and the hydrocarbon group or aromatic group may have an amine group), CH2=CH-OR9, CH2=CH-R10 (herein, R9, and R11 are independently selected from the group consisting of -COO-, -O-, and -CO-, and the hydrocarbon group or aromatic group may have an amino group), CH2=CH-OR9, _CH2 =CH- ^R10 (herein, ^R11 , and R12 are independently selected from the group consisting of -COO-, -O-, and -CO-, and the hydrocarbon group or aromatic group may have an amino group), _CH2 =CH- ^OR9 , CH2=CH-R10 ¹⁰ independently have 3 to 15 carbon atoms, have no hydroxyl group, contain at least one saturated or unsaturated alkyl group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, and the alkyl group or aromatic group may have an amine group), C ₄ HO ₃ -R ¹¹ , and C ₄ H ₂ NO ₂ -R ¹² (herein, C ₄ HO ₃ - represents a maleic anhydride group, C ₄ H ₂ NO ₂ - represents a maleic anhydride group, R ¹¹ , and R ¹² is independently a hydrogen atom or has 1 to 15 carbon atoms, has no hydroxyl group, contains at least one saturated or unsaturated alkyl group, or further contains at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, and the alkyl group or aromatic group may have an amine group). A hardening resin composition as claimed in any one of claims 1 to 3, wherein the condensate comprises a polymer of the compound represented by formula B1, formula B2, or formula B3. A hardening resin composition as claimed in any one of claims 1 to 3, wherein the condensate comprises a dimer, trimer or higher polymer of the compound represented by formula B1, formula B2 or formula B3. A hardening resin composition as claimed in any one of claims 1 to 3, wherein the crosslinking agent has a weight average degree of polymerization of 1.3 to 1.8 for the compound represented by formula B1, formula B2, or formula B3, respectively. A hardening resin composition as claimed in any one of claims 1 to 3, wherein the ratio of the mass of the chain polymer to the mass of the crosslinking agent in the composition is 1:2 to 1:0.03. The hardening resin composition of any one of claims 1 to 3 further comprises an acid catalyst. As in claim 13, the hardening resin composition, wherein the acid catalyst is any compound selected from the group consisting of p-toluenesulfonic acid (PTS), dodecylbenzenesulfonic acid, and thermal acid generator San-Aid SI-100L (San-Shin Chemical Industry Co., Ltd.), or a salt thereof or a solvent thereof. The hardening resin composition of any one of claims 1 to 3, which contains a solvent. A hardened resin film, which is formed by hardening the hardening resin composition as described in any one of claims 1 to 3. An easily peelable hardened resin film is formed by hardening a hardening resin composition as described in any one of claims 1 to 3 on a substrate surface into a film shape. The hardened resin film of claim 16 or 17 has a peeling force of 0.5 N/mm ² or less on a sodium glass substrate or an alkali-free glass substrate. The hardened resin film of claim 18 has a peeling force of 0.1 N/mm ² or less on a sodium glass substrate or an alkali-free glass substrate. A method for producing a hardened resin film, which is a method for producing a hardened resin film from a hardening resin composition as described in any one of claims 1 to 3, comprising: (i) preparing a chain polymer having a side chain with an alcoholic secondary or tertiary hydroxyl group and a crosslinking agent; (ii) coating the hardening resin composition containing the chain polymer and the crosslinking agent on a substrate to form a hardening resin composition coating; and (iii) curing the hardening resin composition coating by subjecting it to a polymerization reaction to produce a hardened resin film. The manufacturing method of claim 20 further includes (iv) a step of peeling the hardened resin film formed on the substrate from the substrate. A method for producing a hardened resin film, which is a method for producing a hardened resin film, comprising: (i) preparing a chain polymer having a side chain with an alcoholic secondary or tertiary hydroxyl group and a crosslinking agent; (ii) applying a composition comprising the chain polymer and the crosslinking agent on a substrate to form a hardening resin composition coating; and (iii) subjecting the hardening resin composition coating to a polymerization reaction to harden the hardening resin composition. The step of preparing a hardened resin film by catalysis, wherein (a) the side chain comprises 3 to 30 carbon atoms and comprises at least one saturated or unsaturated hydrocarbon group, or further comprises at least one aromatic group, and may comprise a bond selected from the group consisting of -COO-, -O-, and -CO- that connects the carbon atoms of adjacent groups therein, and (b) the crosslinking agent is selected from the group consisting of formula B1:

(Herein, R ^1b has 1 to 25 carbon atoms and is selected from substituted or unsubstituted aromatic groups, and

R ^2b to R ^7b independently have 1 to 10 carbon atoms and are substituted or unsubstituted alkyl) and/or its condensate, formula B2:

(herein, R ^8b to R ^11b independently have 1 to 10 carbon atoms and are substituted or unsubstituted alkyl) and/or its condensate, and formula B3: [Chemical 10]

(herein, R ^12b and R ^13b independently have 1 to 10 carbon atoms and are substituted or unsubstituted alkyl groups, and R ^14b and R ^15b independently have 1 to 10 carbon atoms and are substituted or unsubstituted alkyl groups) and/or their condensates; the chain polymer comprises formula A2:

(Herein, R ^1a is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted alkenyl; L ¹ is selected from the group consisting of a single bond, substituted or unsubstituted alkylene, and substituted or unsubstituted alkenylene; R ^5a to R ^14a are independently selected from the group consisting of hydrogen, hydroxyl, and

The crosslinking agent is a group consisting of a monomer unit represented by a formula A2, wherein L1 is a single bond, ^R5a is a hydroxyl group, ^{and R6a to R14a} are ^hydrogen , and the crosslinking agent is not a compound represented by a formula ^B1 and/or a condensate thereof. As in the manufacturing method of claim 22, the chain polymer further comprises the following additional monomer units, the additional monomer units are at least one of (meth) acrylic monomers, vinyl ester monomers, vinyl ether monomers, and vinyl monomers other than these monomers that do not have a hydroxyl group and have 1 to 15 carbon atoms in the side chain. The production method of claim 23, wherein the additional monomer unit is selected from _CH2 =CH-COO- ^R6 , _CH2 =C( _CH3 )-COO- ^R7 , _CH2 =CH-O-CO- ^R8 (herein, R6, R7, and ^R8 independently have 1 to 15 carbon atoms, have no hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-), ^CH2 =CH ^-OR9 , CH2=CH-R10 (herein, R9, and R8 are each independently 1 to 15 carbon atoms, have no hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond selected from the group consisting of -COO-, -O-, and -CO- connecting carbon atoms), _CH2 =CH- ^OR9 , _CH2 =CH- ^R10 (herein, R9, and R10 are each independently 1 to 15 carbon atoms, have no hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of ^{-COO-, -O-} , and -CO- ¹⁰ independently have 3 to 15 carbon atoms, have no hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-), C ₄ HO ₃ -R ¹¹ , and C ₄ H ₂ NO ₂ -R ¹² (herein, C ₄ HO ₃ - represents a maleic anhydride group, C ₄ H ₂ NO ₂ - represents a maleic anhydride group, R ¹¹ , and R ¹² are independently hydrogen atoms or have 1 to 15 carbon atoms, have no hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-). A manufacturing method as in any one of claims 22 to 24, wherein the ratio of monomer units having alcoholic secondary or tertiary hydroxyl groups in the monomer units constituting the chain polymer is 30 to 100 mol%. A manufacturing method as claimed in any one of claims 22 to 24, wherein the ratio of the mass of the chain polymer to the mass of the crosslinking agent in the composition is 1:2 to 1:0.03. A manufacturing method as claimed in any one of claims 22 to 24, wherein the composition comprises a solvent. A manufacturing method as claimed in any one of claims 22 to 24, wherein the composition further comprises an acid catalyst. The method for manufacturing a hardened resin film as claimed in any one of claims 22 to 24 further comprises (iv) a step of peeling the hardened resin film formed on the substrate from the substrate. A use of a hardening resin composition for obtaining an easily peelable hardening resin film, the hardening resin composition comprising a chain polymer having a side chain with an alcoholic secondary or tertiary hydroxyl group, and a crosslinking agent, wherein (a) the side chain comprises 3 to 30 carbon atoms, and comprises at least one saturated or unsaturated hydrocarbon group, or further comprises at least one aromatic group, and may comprise a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-; and (b) the crosslinking agent is selected from the formula B1:

(Herein, R ^1b has 1 to 25 carbon atoms and is selected from substituted or unsubstituted aromatic groups, and

R ^2b to R ^7b independently have 1 to 10 carbon atoms and are substituted or unsubstituted alkyl) and/or its condensate, formula B2:

(herein, R ^8b to R ^11b independently have 1 to 10 carbon atoms and are substituted or unsubstituted alkyl) and/or its condensate, and formula B3:

(herein, R ^12b and R ^13b independently have 1 to 10 carbon atoms and are substituted or unsubstituted alkyl groups, and R ^14b and R ^15b independently have 1 to 10 carbon atoms and are substituted or unsubstituted alkyl groups) and/or their condensates; the chain polymer comprises formula A2:

(Herein, R ^1a is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted alkenyl; L ¹ is selected from the group consisting of a single bond, substituted or unsubstituted alkylene, and substituted or unsubstituted alkenylene; R ^5a to R ^14a are independently selected from the group consisting of hydrogen, hydroxyl, and

The group is composed of a monomer unit represented by a group consisting of, however, at least one of R ^5a to R ^14a is a hydroxyl group, and R ^15a is selected from the group consisting of a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted cycloalkenyl group, a substituted or unsubstituted aromatic group, and a substituted or unsubstituted heteroaromatic group. The use of claim 30, wherein the chain polymer comprises formula A5:

(Herein, R ^1a and L ¹ are as defined in claim 30, and R ^19a is selected from the group consisting of substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkyl, and substituted or unsubstituted cycloalkenyl). The use according to claim 31, wherein R ^19a is a substituted or unsubstituted adamantyl group. The use according to any one of claims 30 to 32, wherein R ^1a is hydrogen or methyl. For use as in any one of claims 30 to 32, wherein the chain polymer further comprises the following additional monomer units, wherein the additional monomer units are at least one of unsubstituted or α-substituted (meth) acrylic monomers, unsubstituted or α-substituted vinyl ester monomers, unsubstituted or α-substituted vinyl ether monomers, and unsubstituted or α-substituted vinyl monomers other than these monomers, which may or may not have a hydroxyl group and have 1 to 15 carbon atoms in the side chain. The use of claim 34, wherein the additional monomer unit is selected from _CH2 =C( ^R1a )-COO- ^R6 , _CH2 =C( ^R1a )-O-CO- ^R8 (herein, ^R6 and ^R8 independently have 1 to 15 carbon atoms, may or may not have a hydroxyl group, and contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, the hydrocarbon group or aromatic group may have an amine group, and ^R1a is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted alkenyl), _CH2 =C( ^R1a ) ^-OR9 , _CH2 =C(R ^1a )-R ¹⁰ (herein, R ⁹ and R ¹⁰ independently have 3 to 15 carbon atoms, may or may not have a hydroxyl group, and include at least one saturated or unsaturated alkyl group, or further include at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, the alkyl group or aromatic group may have an amine group, and R ^1a is selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, and a substituted or unsubstituted alkenyl group), C ₄ (R ^1a )O ₃ -R ¹¹ , and C ₄ (R ^1a )HNO ₂ -R ¹² (herein, C ₄ (R ^1a )O ₃ - represents an unsubstituted or substituted maleic anhydride group, C ₄ (R ^1a )HNO ₂ - represents an unsubstituted or substituted maleic anhydride group, R ¹¹ and R ¹² are independently a hydrogen atom or have 1 to 15 carbon atoms, may or may not have a hydroxyl group, and include at least one saturated or unsaturated alkyl group, or further include at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, the alkyl group or aromatic group may have an amine group, and R ^1a is selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, and a substituted or unsubstituted alkenyl group). For use in any one of claims 30 to 32, the chain polymer further comprises the following additional monomer units, the additional monomer units are at least one of (meth) acrylic monomers, vinyl ester monomers, vinyl ether monomers, and vinyl monomers other than these monomers that do not have a hydroxyl group and have 1 to 15 carbon atoms in the side chain. The use of claim 34, wherein the additional monomer unit is selected from _CH2 =CH-COO- ^R6 , _CH2 =C( _CH3 )-COO- ^R7 , CH2=CH-O-CO- ^R8 (herein, ^R6 , ^R7 and R8 independently have 1 to 15 carbon atoms, do not have a hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, and the hydrocarbon group or aromatic group may have an amine group), _CH2 =CH-OR9, CH2=CH-R10 (herein, R9, and ^R8 are independently 1 to 15 carbon atoms, do not have a hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or further contain at least one aromatic group, and may have a bond selected from the group consisting of -COO-, -O-, and -CO- connecting carbon atoms, and the hydrocarbon group or aromatic group may have an amine group), CH2=CH-OR9, _CH2 =CH- ^R10 (herein, R9, and R10 are independently 1 to 15 carbon atoms, do not have a hydroxyl group, contain at least one saturated or unsaturated hydrocarbon group, or contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO- ^{, -O-} , and -CO-, and the hydrocarbon group or aromatic group may have an amine group), _CH2 =CH- ^OR9 , CH2=CH-R10 ¹⁰ independently have 3 to 15 carbon atoms, have no hydroxyl group, contain at least one saturated or unsaturated alkyl group, or further contain at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, and the alkyl group or aromatic group may have an amine group), C ₄ HO ₃ -R ¹¹ , and C ₄ H ₂ NO ₂ -R ¹² (herein, C ₄ HO ₃ - represents a maleic anhydride group, C ₄ H ₂ NO ₂ - represents a maleic anhydride group, R ¹¹ , and R ¹² is independently a hydrogen atom or has 1 to 15 carbon atoms, has no hydroxyl group, contains at least one saturated or unsaturated alkyl group, or further contains at least one aromatic group, and may have a bond connecting carbon atoms selected from the group consisting of -COO-, -O-, and -CO-, and the alkyl group or aromatic group may have an amine group). For use as in any one of claims 30 to 32, the proportion of monomer units having alcoholic secondary or tertiary hydroxyl groups in the monomer units constituting the chain polymer is 30 to 100 mol%. The use of any one of claims 30 to 32, wherein the condensate comprises a polymer of the compound represented by formula B1, formula B2, or formula B3. The use as claimed in any one of claims 30 to 32, wherein the condensate comprises a dimer, trimer or higher polymer of the compound represented by formula B1, formula B2 or formula B3. The use of any one of claims 30 to 32, wherein the crosslinking agent has a weight average degree of polymerization of 1.3 to 1.8 for the compound represented by formula B1, formula B2, or formula B3, respectively. For use as in any one of claims 30 to 32, the ratio of the mass of the chain polymer to the mass of the crosslinking agent in the composition is 1:2 to 1:0.03. The use as in any one of claims 30 to 32, further comprising an acid catalyst. For use as claimed in claim 43, the acid catalyst is any compound selected from the group consisting of p-toluenesulfonic acid (PTS), dodecylbenzenesulfonic acid, and thermal acid generator San-Aid SI-100L (San-Aid Chemical Industry Co., Ltd.), or a salt thereof or a solvent thereof. The use according to any one of claims 30 to 32, which comprises a solvent.