WO2022019095A1 - 熱硬化性樹脂組成物、カバーレイフィルム、接着シート、及びフレキシブルプリント配線板 - Google Patents
熱硬化性樹脂組成物、カバーレイフィルム、接着シート、及びフレキシブルプリント配線板 Download PDFInfo
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- WO2022019095A1 WO2022019095A1 PCT/JP2021/025253 JP2021025253W WO2022019095A1 WO 2022019095 A1 WO2022019095 A1 WO 2022019095A1 JP 2021025253 W JP2021025253 W JP 2021025253W WO 2022019095 A1 WO2022019095 A1 WO 2022019095A1
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
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- C08G18/44—Polycarbonates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- C08F136/02—Homopolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F136/04—Homopolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
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- C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
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- C08G59/245—Di-epoxy compounds carbocyclic aromatic
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- H—ELECTRICITY
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
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- B32B2457/08—PCBs, i.e. printed circuit boards
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- C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
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Definitions
- the present invention relates to a thermosetting resin composition, a coverlay film, an adhesive sheet, and a flexible printed wiring board.
- sheet-shaped electronic materials constituting electronic devices include coverlay films, adhesive sheets, flexible printed wiring boards, and the like.
- Such electronic materials have physical characteristics such as peel strength (hereinafter, also referred to as peel strength), electrical characteristics such as electrical insulation reliability (hereinafter, also referred to as migration characteristics), and heat resistance characteristics such as solder heat resistance.
- peel strength peel strength
- electrical characteristics such as electrical insulation reliability (hereinafter, also referred to as migration characteristics)
- heat resistance characteristics such as solder heat resistance.
- flame retardant properties are required to be well-balanced (see, for example, Patent Document 1).
- sheet-shaped electronic materials in recent years are that they can be processed efficiently and easily, and that they have excellent electrical insulation reliability under harsh conditions.
- processing can be performed efficiently and easily means that thermocompression bonding can be performed in a short time (hereinafter, also referred to as quick press).
- having excellent electrical insulation reliability under harsh conditions means, for example, evaluation of electrical insulation reliability under high stress conditions of 110 ° C., 85% RH, and DC50V, that is, BHAST (Biased Highly Accelerated temperature and). In humidity Stress Test), it means having excellent electrical insulation reliability.
- the present invention has been made in view of the above circumstances, and provides a thermosetting resin composition, a coverlay film, an adhesive sheet, and a flexible printed wiring board which can be quickly pressed and has excellent electrical insulation reliability in BHAST.
- the purpose is to do.
- the present inventors have found a solid epoxy resin at 25 ° C, a non-solid epoxy resin at 25 ° C, and fine particle rubber dispersed in the non-solid epoxy resin.
- a curing agent, an inorganic filler, and a polyurethane derived from a polycarbonate diol, and the content of the fine particle rubber is 3 to 15 with respect to the total number of parts of the solid epoxy resin and the non-solid epoxy resin.
- thermosetting resin composition which is a part by mass, has an acid value of 10 to 30 mgKOH / g of the polyurethane derived from the polycarbonate diol, and has a weight average molecular weight of 15,000 to 50,000 of the polyurethane derived from the polycarbonate diol.
- the present invention is as follows. [1] A solid epoxy resin at 25 ° C, a non-solid epoxy resin at 25 ° C, fine particle rubber dispersed in the non-solid epoxy resin, a curing agent, an inorganic filler, and polyurethane derived from polycarbonate diol.
- the content of the fine particle rubber is 3 to 15 parts by mass with respect to the total number of parts by mass of the solid epoxy resin and the non-solid epoxy resin, and the acid value of the polyurethane derived from the polycarbonate diol is A thermosetting resin composition having a weight average molecular weight of 10 to 30 mgKOH / g and a weight average molecular weight of the polyurethane derived from the polycarbonate diol of 15,000 to 50,000.
- thermosetting resin composition according to [1] or [2].
- thermosetting resin composition according to any one of [3].
- thermosetting resin composition according to any one of.
- thermosetting resin composition according to any one of [1] to [5] above, which is composed of a base material and an adhesive layer laminated on one side of the base material.
- Coverlay film composed of things.
- a coverlay film composed of a substrate on which wiring is formed and an adhesive layer laminated on one surface of the substrate is provided, and the surface of the substrate on which the wiring is formed is provided.
- a flexible printed wiring board provided with a coverlay film so as to be in contact with the adhesive layer, wherein the coverlay film is the coverlay film according to the above [6].
- thermosetting resin composition a coverlay film, an adhesive sheet, and a flexible printed wiring board which can be quickly pressed and have excellent electrical insulation reliability in BHAST.
- thermosetting resin composition of this invention It is a top view which shows the wiring pattern adopted in the characteristic evaluation test of the flexible printed wiring board which used the thermosetting resin composition of this invention.
- embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail.
- the following embodiments are examples for explaining the present invention, and are not intended to limit the present invention to the following contents.
- the present invention can be appropriately modified and carried out within the scope of the gist thereof.
- thermosetting resin composition The thermosetting resin composition of the present invention is mainly preferably used as a resin composition for electronic materials such as coverlay films, adhesive sheets, and flexible printed wiring boards.
- the thermosetting resin composition of the embodiment contains a solid epoxy resin at 25 ° C, a non-solid epoxy resin at 25 ° C, fine particle rubber dispersed in the non-solid epoxy resin, a curing agent, and an inorganic filler. And polyurethane derived from polycarbonate diol.
- the content of the fine particle rubber is 3 to 15 parts by mass
- the acid value of the polyurethane derived from the polycarbonate diol is 10 to 30 mgKOH / g
- the polycarbonate is based on the total number of parts by mass of the solid epoxy resin and the non-solid epoxy resin.
- the weight average molecular weight of diol-derived polyurethane is 15,000 to 50,000.
- the epoxy resin contained in the thermosetting resin composition of the embodiment spreads the resin in the fine grooves between the wirings from the viewpoint of uniformly mixing the thermosetting resin composition (hereinafter, also referred to as wiring filling property). From the viewpoint, from the viewpoint of enhancing the reliability of electrical insulation after the thermosetting resin composition is cured, and from the viewpoint of imparting heat resistance, it contains both a solid epoxy resin at 25 ° C and a non-solid epoxy resin at 25 ° C. ..
- the epoxy resin solid at 25 ° C. has two or more epoxy groups in one molecule and has an epoxy equivalent from the viewpoint of enhancing the reactivity and enhancing the electrical insulation reliability after the thermosetting resin composition is cured. Is preferably 150 to 500 g / eq, and more preferably 150 to 350 g / eq.
- the epoxy resin the epoxy equivalent is within the range of the above-mentioned epoxy equivalent, for example, bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, novolak type epoxy resin, amine type epoxy resin, biphenyl type. Examples thereof include epoxy resins and alicyclic epoxy resins.
- a bisphenol A type epoxy resin is preferable, and a biphenyl type epoxy resin is more preferable.
- Two or more kinds of epoxy resins may be used.
- the epoxy resin solid at 25 ° C. may be previously dissolved in an organic solvent in order to facilitate mixing with other materials contained in the thermosetting resin composition.
- the epoxy equivalent of the epoxy resin can be measured in accordance with JIS K7236 2001.
- the content of the solid epoxy resin at 25 ° C is 100 parts by mass when the total of the epoxy resins (solid epoxy resin at 25 ° C and non-solid epoxy resin at 25 ° C) contained in the thermosetting resin composition is 100 parts by mass. It is preferably 60 to 85 parts by mass.
- the thermosetting resin composition is processed into a sheet, and the cured state of the thermosetting resin composition is half. Tackiness (stickiness) can be suppressed when the cured state (B stage) is set. Furthermore, it is possible to reduce the amount of air (air bubbles) mixed in during the quick press.
- the mass part used in the present invention means the mass part in terms of non-volatile content.
- the mass part in terms of non-volatile content means, for example, the mass part of the resin (nonvolatile component) excluding volatile components such as an organic solvent contained in the resin.
- the semi-cured state (B stage) means a state in which the curing reaction of the thermosetting resin composition has progressed halfway but not completely.
- the non-solid epoxy resin at 25 ° C means an epoxy resin that is fluid at 25 ° C.
- the non-solid epoxy resin at 25 ° C. has an epoxy group in one molecule from the viewpoint of enhancing the dispersibility of the fine particle rubber and increasing the peel strength of the sheet-shaped electronic material composed of the thermosetting resin composition. It is preferable to have two or more and the epoxy equivalent is 100 to 400 g / eq, and more preferably 150 to 350 g / eq.
- the epoxy resin include bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenol novolac type epoxy resin, amine type epoxy resin, and alicyclic epoxy resin having an epoxy equivalent within the above range. Two or more kinds of epoxy resins may be used.
- thermosetting resin composition From the viewpoint of heat resistance, bisphenol A type epoxy resin is preferable, and phenol novolac type epoxy resin is more preferable. Further, from the viewpoint of exhibiting physical characteristics such as peel strength of a sheet-shaped electronic material composed of a thermosetting resin composition, fine particle rubber is non-solid at 25 ° C. before preparing the thermosetting resin composition. It is preferable to use the one uniformly dispersed in the epoxy resin of.
- the content of the non-solid epoxy resin at 25 ° C. was 100 parts by mass based on the total of the epoxy resins (solid epoxy resin at 25 ° C. and non-solid epoxy resin at 25 ° C.) contained in the thermosetting resin composition. Sometimes, it is preferably 15 to 40 parts by mass, more preferably 15 to 35 parts by mass, and further preferably 15 to 30 parts by mass. When the content of the non-solid epoxy resin is in the range of 15 to 40 parts by mass at 25 ° C., the peel strength of the sheet-shaped electronic material composed of the thermosetting resin composition can be maintained in a high state.
- the fine particle rubber is preferably core-shell polymer particles composed of a core layer and a shell layer covering the surface thereof.
- the polymer constituting the core layer is a polymer having rubber-like elasticity.
- the polymer having rubber-like elasticity include diene-based rubber, acrylic rubber, styrene rubber, and polysiloxane rubber. It may be composed of two or more kinds of polymers.
- polymer constituting the shell layer examples include (meth) acrylic acid ester-based monomer, aromatic vinyl-based monomer, cyanide vinyl-based monomer, unsaturated acid derivative, (meth) acrylamide derivative, and maleimide derivative.
- examples thereof include a (co) polymer obtained by copolymerizing one or more selected components.
- the polymer constituting the shell layer is bonded to the polymer constituting the core layer by graft polymerization. As a result, a part or the whole of the surface of the core layer is stably covered with the shell layer, and reaggregation of the core-shell polymer particles can be prevented.
- the polymer constituting the shell layer has a functional group that reacts with the resin or the curing agent contained in the thermosetting resin composition.
- the functional group include a hydroxyl group, a carboxyl group and an epoxy group, and an epoxy group is preferable from the viewpoint of improving compatibility with an epoxy resin.
- the size of the fine particle rubber is preferably 0.05 to 1 ⁇ m in terms of average particle size from the viewpoint of improving the dispersibility.
- the content of the fine particle rubber is preferably 3 to 3 parts by mass when the total of the epoxy resins (solid epoxy resin at 25 ° C. and non-solid epoxy resin at 25 ° C.) contained in the thermosetting resin composition is 100 parts by mass. It is 15 parts by mass, more preferably 3 to 13 parts by mass, and even more preferably 3 to 10 parts by mass.
- the thermosetting resin composition is composed of the thermosetting resin composition without deteriorating the reliability of electrical insulation after curing. The peel strength of the sheet-shaped electronic material can be maintained in a high state.
- fine particle rubber it is preferable to use fine particle rubber dispersed in a non-solid epoxy resin at 25 ° C. from the viewpoint of uniformly dispersing in the thermosetting resin composition.
- Examples of the fine particle rubber dispersed in the non-solid epoxy resin at 25 ° C. include MX-136, MX-153, MX-154, MX-170, MX-217, MX-257, MX-416, manufactured by Kaneka. MX-451, MX-551, MX-960, MX-965 and the like can be mentioned.
- the curing agent is preferably one that cures the epoxy resin.
- the curing agent include diaminodiphenylmethane (DDM), diaminodiphenylsulphon (DDS), diaminodiphenyl ether (DDE), hexamethylenediamine, dicyandiamide, and phenol novolac.
- DDM diaminodiphenylmethane
- DDS diaminodiphenylsulphon
- DDE diaminodiphenyl ether
- hexamethylenediamine dicyandiamide
- dicyandiamide is preferable
- diaminodiphenylsulphon is more preferable, from the viewpoint of easy control of the curing reaction.
- Two or more kinds of curing agents may be used.
- the equivalent amount of the curing agent is the epoxy resin (25 ° C.) contained in the thermosetting resin composition from the viewpoint of improving the wiring filling property and improving the electrical insulation reliability after the thermosetting resin composition is cured. Is preferably 0.3 to 0.8 equivalents, more preferably 0.3 to 0.6 equivalents, relative to 1 equivalent of the epoxy group (solid epoxy resin and non-solid epoxy resin at 25 ° C.). ..
- inorganic filler examples include aluminum hydroxide, magnesium hydroxide, and silica.
- magnesium hydroxide is preferable, and aluminum hydroxide is more preferable, from the viewpoint of improving flame retardancy and wiring filling property, and from the viewpoint of imparting tack-free property required by a quick press.
- Two or more kinds of inorganic fillers may be used.
- the content of the inorganic filler is an epoxy resin (solid epoxy resin at 25 ° C.) contained in the thermosetting resin composition from the viewpoint of improving flame retardancy and wire filling property and imparting tack-free property.
- the total of the non-solid epoxy resin at 25 ° C. is 100 parts by mass, it is preferably 60 to 150 parts by mass, more preferably 60 to 120 parts by mass, and further preferably 70 to 100 parts by mass. be.
- the polycarbonate diol-derived polyurethane contained in the thermosetting resin composition of the embodiment has at least one polycarbonate skeleton in the molecule.
- the number of polycarbonate skeletons is not particularly limited as long as it is a polyurethane derived from a polycarbonate diol.
- hydrolysis of polyurethane is suppressed in a high temperature and high humidity environment after the thermosetting resin composition is cured. This makes it possible to secure high electrical insulation reliability after the thermosetting resin composition is cured.
- the thermosetting resin composition of the present invention is imparted with film properties by containing polyurethane derived from polycarbonate diol. This imparts the flexibility required for sheet-like electronic materials such as coverlay films and adhesive sheets.
- polycarbonate diol examples include a polycarbonate diol represented by the following general formula (1).
- R indicates an alkylene group having 1 to 10 carbon atoms
- m indicates an integer of 1 to 20.
- R in the general formula (1) has 1 to 10 carbon atoms and m is 1 to 20.
- Polyurethane derived from polycarbonate diol can be obtained by polymerizing a polycarbonate diol represented by the general formula (1) with a polyisocyanate.
- the polyisocyanate is not particularly limited as long as it is a polyisocyanate that can react with the polycarbonate diol represented by the general formula (1) to form polyurethane.
- Examples of the polyisocyanate include tolylene-2,4-diisocyanate, 4-methoxy-1,3-phenylenediocyanate, 2,4-diisocyanate diphenyl ether, 4,4'-methylenebis (phenylenedi isocyanate) (MDI), 2,4.
- '-Aromatic diisocyanates such as methylenebis (phenylenediocyanate), tolylene diisocyanate (TDI), xylylene diisocyanate (XDI), 1,5-naphthalenediocyanate; aliphatic diisocyanates such as methylene diisocyanate and 1,6-hexanediisocyanate (HDI).
- Diisocyanates examples include alicyclic diisocyanates such as 1,4-cyclohexylene diisocyanate, 4,4'-methylenebis (cyclohexyldiisocyanate), and isophorone diisocyanate (IPDI).
- the polyisocyanate may be a compound obtained by reacting these isocyanate compounds with a low molecular weight polyol or polyamine to make the terminal functional group an isocyanate group.
- the polyisocyanate may be used alone or in combination of two or more kinds of polyisocyanates. Isophorone diisocyanate is preferable from the viewpoint of heat resistance, flexibility and reactivity.
- Polyurethane derived from polycarbonate diol is preferably acidic from the viewpoint of improving the peel strength of the sheet-shaped electronic material composed of the thermosetting resin composition.
- the polyurethane derived from the acidic polycarbonate diol preferably has a hydroxyl group, a sulfo group, and a carboxyl group in the molecular chain (mainly side chain) of the polyurethane, and from the viewpoint of improving the reactivity with the epoxy resin, It is more preferable to have a carboxyl group from the viewpoint of improving the electrical properties of the thermosetting resin composition after curing.
- the acidity can be indicated by the acid value.
- the acid value of polyurethane derived from polycarbonate diol is 10 to 30 mgKOH / g, preferably 10 to 25 mgKOH / g.
- the acid value of the polyurethane derived from the polycarbonate diol is 10 to 30 mgKOH / g, the wiring filling property is improved, and the peel strength of the sheet-shaped electronic material composed of the thermosetting resin composition is improved.
- the acid value of polyurethane derived from polycarbonate diol can be measured in accordance with JIS K0070.
- the content of polyurethane derived from the polycarbonate diol is an epoxy resin (solid at 25 ° C.) contained in the thermosetting resin composition from the viewpoint of increasing the peel strength of the sheet-shaped electronic material composed of the thermosetting resin composition.
- an epoxy resin solid at 25 ° C.
- the total of the epoxy resin and the non-solid epoxy resin at 25 ° C. is 100 parts by mass, it is preferably 50 to 100 parts by mass, more preferably 60 to 90 parts by mass, and further preferably 70 to 80 parts by mass. It is a department.
- the weight average molecular weight of the polyurethane derived from the polycarbonate diol is preferably 150,000 to 50,000, more preferably 20,000 to 45,000, and further preferably 25,000 to 40,000.
- the weight average molecular weight of the polyurethane derived from the polycarbonate diol can be measured by gel permeation chromatography (GPC) using standard polystyrene having an average molecular weight of about 5 to about 1 million.
- thermosetting resin composition of the embodiment may further contain other additives and the like.
- additives include imidazole-based accelerators such as 2-methylimidazole, N-benzyl-2-methylimidazole and 2-undecylimidazole, Lewis acid complexes such as boron trifluoride monoethylamine, polyamines and melamine resins. Examples thereof include curing accelerators, dispersants, softeners, antiaging agents, pigments, dyes, and silane coupling agents.
- Coverlay film is used, for example, to protect the wiring formed on the substrate.
- the coverlay film is composed of a base material and an adhesive layer laminated on one side of the base material.
- the adhesive layer may be provided on both sides of the film-shaped base material. According to the coverlay film having this configuration, the wiring surface of a plurality of substrates can be protected by one coverlay film. Further, the substrate can be multi-layered.
- the base material that constitutes the coverlay film is a film-like base material.
- the thickness of the base material is 2 to 75 ⁇ m.
- the substrate of the coverlay film examples include a polyimide (PI) -based substrate, a polyamide (PA) -based substrate, a polyethylene naphthalate (PEN) -based substrate, a polyamideimide (PAI) -based substrate, and a polyethylene terephthalate (PET).
- PI polyimide
- PA polyamide
- PEN polyethylene naphthalate
- PAI polyamideimide
- PET polyethylene terephthalate
- PPS polyphenylene sulfide
- LCP liquid crystal
- a polyimide (PI) -based substrate is preferable from the viewpoint of flame retardancy, electrical insulation reliability, heat resistance, and elastic modulus.
- the surface of the base material can be subjected to surface modification treatment such as corona treatment and plasma treatment. As a result, the surface of the base material is modified, and the adhesion between the adhesive layer and the base material is improved.
- the adhesive layer is composed of the thermosetting resin composition of the embodiment.
- the thickness of the adhesive layer is 5 to 50 ⁇ m after drying.
- the cured state of the thermosetting resin composition constituting the adhesive layer is a semi-cured state (B stage).
- the coverlay film is produced by the following procedure.
- a solution containing the thermosetting resin composition in which the thermosetting resin composition is dissolved in an organic solvent is prepared.
- the solution is applied on a film-like substrate.
- the thermosetting resin composition is heated until it reaches a semi-cured state (B stage).
- B stage After cooling, a coverlay film in which an adhesive layer composed of a thermosetting resin composition is formed on a film-like substrate is obtained.
- the heating conditions are 100 to 250 ° C., 5 seconds to 30 minutes, and are adjusted according to the coating thickness.
- organic solvent examples include alcohols such as methanol and ethanol; glycols such as ethylene glycol and propylene glycol; glycol monoalkyl ethers such as ethylene glycol monomethyl ether and ethylene glycol monoethyl ether; ethylene glycol dimethyl ether and ethylene glycol diethyl.
- Glycoldialkyl ethers such as ethers; alkyl esters such as methyl acetate, ethyl acetate, propyl acetate, methyl acetoacetate, methyl acetoacetate; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone; benzene, toluene, xylene, ethylbenzene Aromatic hydrocarbons such as; aliphatic hydrocarbons such as hexane, cyclohexane and octane; amides such as dimethylformamide, dimethylacetamide and N-methylpyrrolidone; cyclic ethers such as tetrahydrofuran and dioxane.
- the coating device is not particularly limited, and a known coater can be used.
- a die coater for example, a die coater, a comma coater, a gravure coater, and the like.
- the coverlay film can be produced by the following procedure. First, an adhesive layer is formed on the surface of the release film that has been subjected to the release treatment so that the thickness after drying is 5 ⁇ m. Then, a film-like base material used for the coverlay film is separately prepared, and the surface of the base material and the surface of the adhesive layer are laminated so as to be aligned with each other. Next, after heating and pressurizing the obtained laminate, only the release film is peeled off. This makes it possible to obtain a coverlay film having a thickness of the adhesive layer of 5 ⁇ m.
- the adhesive sheet is a sheet of an adhesive material composed of the thermosetting resin composition of the embodiment.
- the thickness of the adhesive layer constituting the adhesive sheet is 5 to 50 ⁇ m.
- the adhesive sheet is made by the following procedure.
- a solution containing the thermosetting resin composition in which the thermosetting resin composition is dissolved in an organic solvent is prepared.
- the solution is applied to the mold release-treated surface of the film-like substrate that has been mold-released.
- the thermosetting resin composition is heated until it reaches a semi-cured state (B stage).
- B stage After cooling, an adhesive sheet having an adhesive layer composed of a thermosetting resin composition formed on a film-like substrate is obtained.
- the heating conditions are 100 to 250 ° C., 5 seconds to 30 minutes, and are adjusted according to the coating thickness.
- the film-like base material is peeled off from the adhesive layer before use.
- Examples of the mold release treatment agent used for the base material subjected to the mold release treatment include a silicone-based treatment agent and a fluorine-based treatment agent.
- Another configuration of the adhesive sheet is, for example, a configuration in which adhesive layers are provided on both sides of a film-like base material from the viewpoint of enhancing rigidity and electrical insulation reliability.
- a prepreg in which a base material such as a woven fabric or a non-woven fabric is impregnated with a thermosetting resin composition can be mentioned.
- the prepreg is prepared by the following procedure. First, a woven fabric or a non-woven fabric composed of fibers such as glass fibers is prepared as a base material. Next, a solution containing the thermosetting resin composition in which the thermosetting resin composition is dissolved in an organic solvent is prepared. The solution is impregnated with the substrate. The substrate pulled up from the solution is heated until the attached thermosetting resin composition reaches the B stage. After cooling, a B-stage prepreg is obtained.
- the adhesive sheet can be used as an interlayer adhesive for adhering substrates such as flexible printed wiring boards. Further, the wiring can be protected by the adhesive sheet covering the wiring.
- the flexible printed wiring board includes a substrate on which wiring is formed and a coverlay film composed of a base material and an adhesive layer laminated on one side of the base material, and adheres to the surface on which the wiring of the substrate is formed.
- a coverlay film is provided so that the material layers are in contact with each other.
- the wiring formed on the substrate is, for example, a wiring formed by etching a copper-plated laminated plate or a copper layer of a copper-plated laminated plate.
- the wiring formed on another substrate the wiring may be formed by inkjet printing using conductive ink.
- the wiring material may be composed of other metals such as silver and zinc instead of copper.
- the thickness of the substrate used for the flexible printed wiring board is not particularly limited, but is 15 to 200 ⁇ m from the viewpoint that the substrate has flexibility.
- the flexible printed wiring board is manufactured by the following procedure.
- a coverlay film composed of a substrate on which wiring is formed and an adhesive layer laminated on one side of the substrate and the substrate is prepared.
- the coverlay film is laminated so that the adhesive layer is in contact with the surface on which the wiring of the substrate is formed, and the coating is heated and pressed.
- the conditions for heating and pressurizing are 120 to 250 ° C., 5 seconds to 120 minutes, and 1 to 10 MPa, which are set according to the laminated configuration.
- Epoxy resin (1) Epoxy resin A: Biphenyl type epoxy resin solid at 25 ° C., epoxy equivalent 290 g / eq (manufactured by Nippon Kayaku Co., Ltd., NC3000H), (2) Epoxy resin B: Non-solid bisphenol A type epoxy resin at 25 ° C., epoxy equivalent 190 g / eq (DIC Corporation, Epicron 850), (3) Epoxy resin C: Non-solid fine particle rubber dispersed epoxy resin (phenol novolac type) at 25 ° C, epoxy equivalent 231 g / eq, fine particle rubber (polybutadiene rubber, average particle size 0.1 ⁇ m) with a total solid content of 100 Containing 25 parts by mass (manufactured by Kaneka, MX-217), (4) Epoxy resin D: Non-solid fine particle rubber dispersed epoxy resin (bisphenol A type) at 25 ° C., epoxy equivalent 294
- Diaminodiphenyl sulfone Amine value 62 g / eq (3, 3'-DAS manufactured by Konishi Chemical Industry Co., Ltd.).
- dimethylacetamide corresponding to 10% by mass of the total amount of (a), (b) and (c) and 45% by mass of the total amount of (a), (b) and (c).
- the corresponding toluene was added and stirred at 100 ° C. Then, after reacting until the NCO group disappears, methyl ethyl ketone corresponding to 45% by mass of the total amount of (a), (b) and (c) is added to obtain a polyurethane resin solution having a resin content of 45% by mass. rice field.
- polyurethanes B to I derived from the polycarbonate diol were synthesized by the same method as the synthesis of the polyurethane A derived from the polycarbonate diol by changing the addition amount of each component as shown in Table 1.
- Polyester-based polyurethane J number average molecular weight 13000, acid value 35 mgKOH / g (manufactured by Toyobo Co., Ltd., UR-3500), (2) Acrylonitrile butadiene rubber K: Acid value 40 mgKOH / g (manufactured by JSR Corporation, JSR XER-32C).
- each evaluation method and measurement method was performed by the following methods.
- ⁇ Peeling strength peeling strength> (1) Preparation procedure of sample (1-1) Preparation of coverlay film A resin composition to be an adhesive layer is dried on one side of a polyimide film (Apical 12.5 NPI manufactured by Kaneka Corporation) having a thickness of 12.5 ⁇ m. After that, the film was applied so as to have a thickness of 25 ⁇ m, and dried at 160 ° C. for 10 minutes until it became a semi-cured state (B stage). Then, the release PET film was laminated on the adhesive layer side at 100 ° C. to obtain a coverlay film with a release PET film.
- a polyimide film A resin composition to be an adhesive layer is dried on one side of a polyimide film (Apical 12.5 NPI manufactured by Kaneka Corporation) having a thickness of 12.5 ⁇ m. After that, the film was applied so as to have a thickness of 25 ⁇ m, and dried at 160 ° C. for 10 minutes until it became a semi-cured state (B stage). Then,
- BHAST ⁇ Electrical insulation reliability
- Example 1 70 parts by mass of epoxy resin A and 30 parts by mass of epoxy resin C were added to the container, and the total mass of epoxy resin was 100 parts by mass. To this, 10.4 parts by mass of a curing agent, 75 parts by mass of polyurethane A derived from polycarbonate diol, 90 parts by mass of aluminum hydroxide, 10.4 parts by mass of diaminodiphenyl sulfone, and 400 parts by mass of methyl ethyl ketone as an organic solvent are added. rice field. Then, these were stirred at room temperature to obtain a thermosetting resin composition.
- Example 2 Example 2 to (Example 12), (Comparative Example 1) to (Comparative Example 11)
- Tables 2 and 3 the type and content of each component were changed and adjusted by the same method as in Example 1 to obtain a thermosetting resin composition. Unless otherwise specified, the unit of content in the table is parts by mass.
- thermosetting resin compositions of Examples 1 to 12 were excellent in processability (wiring filling property) by quick pressing, and were also excellent in electrical insulation reliability in BHAST. Further, in Examples 1 to 12, no swelling or peeling was observed even when the solder was brought into contact with the solder bath at 260 ° C. for 60 seconds or longer in the solder heat resistance evaluation, and the solder heat resistance was excellent. In addition, all the examples had UL94 standard V-0 grade, which is a flame retardancy evaluation required for sheet-shaped electronic materials.
- solder heat resistance is performed by ⁇ peeling strength (peeling strength)> (1)
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Abstract
Description
[1]25℃において固形のエポキシ樹脂と、25℃において非固形のエポキシ樹脂と、前記非固形のエポキシ樹脂に分散された微粒子ゴムと、硬化剤と、無機充填剤と、ポリカーボネートジオール由来のポリウレタンと、を含み、前記固形のエポキシ樹脂及び前記非固形のエポキシ樹脂の全質量部数に対して、前記微粒子ゴムの含有量が3~15質量部であり、前記ポリカーボネートジオール由来のポリウレタンの酸価が10~30mgKOH/gであり、前記ポリカーボネートジオール由来のポリウレタンの重量平均分子量が15000~50000である、熱硬化性樹脂組成物。
本発明の熱硬化性樹脂組成物は、主に、カバーレイフィルム、接着シート、及びフレキシブルプリント配線板等の電子材料の樹脂組成物として好適に用いられる。
実施形態の熱硬化性樹脂組成物に含まれるエポキシ樹脂は、熱硬化性樹脂組成物を均一に混合させる観点、配線間の微細な溝に樹脂を行き渡らせる(以下、配線埋まり性ともいう。)観点、熱硬化性樹脂組成物が硬化した後の電気絶縁信頼性を高める観点、及び耐熱性を付与する観点から、25℃において固形のエポキシ樹脂と25℃において非固形のエポキシ樹脂の両方を含む。
微粒子ゴムは、コア層とその表面を覆うシェル層から構成されるコアシェルポリマー粒子であることが好ましい。
硬化剤は、エポキシ樹脂を硬化させるものであることが好ましい。硬化剤としては、例えば、ジアミノジフェニルメタン(DDM)、ジアミノジフェニルスルフォン(DDS)、ジアミノジフェニルエーテル(DDE)、ヘキサメチレンジアミン、ジシアンジアミド、フェノールノボラックが挙げられる。これらの中でも、硬化反応の制御のし易さの観点から、ジシアンジアミドが好ましく、ジアミノジフェニルスルフォンがより好ましい。2種以上の硬化剤を用いてもよい。
無機充填剤としては、例えば、水酸化アルミニウム、水酸化マグネシウム、シリカが挙げられる。これらの中でも、難燃性及び配線埋まり性を良好にする観点、及びクイックプレスで求められるタックフリー性を付与する観点から、水酸化マグネシウムが好ましく、水酸化アルミニウムがより好ましい。2種以上の無機充填剤を用いてもよい。
実施形態の熱硬化性樹脂組成物に含まれるポリカーボネートジオール由来のポリウレタンは、分子中に少なくとも1以上のポリカーボネート骨格を有する。ポリカーボネート骨格の数は、ポリカーボネートジオール由来のポリウレタンである限り、特に限定されない。ポリウレタンの分子中に少なくとも1以上のポリカーボネート骨格を有することで、熱硬化性樹脂組成物が硬化した後の高温及び高湿の環境においてポリウレタンの加水分解が抑制される。これにより、熱硬化性樹脂組成物が硬化した後の高い電気絶縁信頼性を確保することができる。また、本発明の熱硬化性樹脂組成物は、ポリカーボネートジオール由来のポリウレタンを含むことで膜性が付与される。これにより、カバーレイフィルム、接着シートなどのシート状の電子材料に必要な柔軟性が付与される。
実施形態の熱硬化性樹脂組成物は、他の添加剤等を更に含有してもよい。他の添加剤としては、2-メチルイミダゾール、N-ベンジル-2-メチルイミダゾール、2-ウンデシルイミダゾール等のイミダゾール系促進剤、三フッ化ホウ素モノエチルアミン等のルイス酸錯体、ポリアミン、メラミン樹脂等の硬化促進剤、分散剤、軟化剤、老化防止剤、顔料、染料、シランカップリング剤等が挙げられる。
カバーレイフィルムは、例えば、基板に形成された配線を保護するために使用される。カバーレイフィルムは、基材と基材の片面に積層された接着材層とから構成される。なお、接着材層は、フィルム状の基材の両面に設けられていてもよい。この構成を有するカバーレイフィルムによれば、複数の基板の配線面を1つのカバーレイフィルムで保護することができる。さらに基板を多層化することができる。
接着シートは、実施形態の熱硬化性樹脂組成物から構成される接着材をシート状にしたものである。
フレキシブルプリント配線板は、配線が形成された基板と、基材と基材の片面に積層された接着材層とから構成されるカバーレイフィルムとを備え、基板の配線が形成された面に接着材層が接するようにカバーレイフィルムが設けられている。
(エポキシ樹脂)
(1)エポキシ樹脂A:25℃において固形のビフェニル型エポキシ樹脂、エポキシ当量290g/eq(日本化薬社製、NC3000H)、
(2)エポキシ樹脂B:25℃において非固形のビスフェノールA型エポキシ樹脂、エポキシ当量190g/eq(DIC社製、エピクロン850)、
(3)エポキシ樹脂C:25℃において非固形の微粒子ゴム分散型エポキシ樹脂(フェノールノボラック型タイプ)、エポキシ当量231g/eq、微粒子ゴム(ポリブタジエンゴム、平均粒径0.1μm)を全固形分100質量部中25質量部含有したもの(カネカ社製、MX-217)、
(4)エポキシ樹脂D:25℃において非固形の微粒子ゴム分散型エポキシ樹脂(ビスフェノールA型タイプ)、エポキシ当量294g/eq、微粒子ゴム(ポリブタジエンゴム、平均粒径0.1μm)を全固形分100質量部中37質量部含有したもの(カネカ社製、MX-257)。
ジアミノジフェニルスルフォン:アミン価62g/eq(小西化学工業社製、3、3’-DAS)。
水酸化アルミニウム(日本軽金属社製、BF013)。
[ポリカーボネートジオール由来のポリウレタンAの合成]
撹拌機、温度計及び冷却管を備えた1リットルのフラスコに、(a)カーボネート系ポリオール(宇部興産社製、エタナコール(登録商標)UH-100(水酸基価112mgKOH/g))を250.0g、(b)ジメチロールプロパン酸を32.1g、(c)イソホロンジイソシアネートを104.2g、を加えた。さらに溶剤として、(a)、(b)、(c)の合計量の10質量%分に相当するジメチルアセトアミドと、(a)、(b)、(c)の合計量の45質量%分に相当するトルエンを加え、100℃で撹拌した。その後、NCO基がなくなるまで反応させた後、(a)、(b)、(c)の合計量の45質量%分に相当するメチルエチルケトンを加えて、樹脂分45質量%のポリウレタン樹脂溶液を得た。
(1)ポリエステル系ポリウレタンJ:数平均分子量13000、酸価35mgKOH/g(東洋紡社製、UR-3500)、
(2)アクリルニトリルブタジエンゴムK:酸価40mgKOH/g(JSR社製、JSR XER-32C)。
(1)サンプルの作製手順
(1-1)カバーレイフィルムの作製
厚さ12.5μmのポリイミドフィルム(カネカ社製、アピカル12.5NPI)の片面に、接着材層となる樹脂組成物を、乾燥後の厚さが25μmとなるように塗布し、160℃、10分の条件で半硬化状態(Bステージ)になるまで乾燥させた。その後、接着材層側に離型PETフィルムを100℃でラミネートすることにより、離型PETフィルム付きカバーレイフィルムを得た。
(1-1)で作製したカバーレイフィルムから離型PETフィルムを剥がし、接着材層の面と、圧延銅箔(JX日鉱日石金属社製、BHY-22B-T、厚さ35μm)の光沢面とを貼り合わせ、185℃、3.0MPa、60秒の条件で加熱加圧した。その後、160℃のオーブンで1時間加熱することで測定用サンプルを得た。
(1-2)で作製した測定用サンプルを幅10mm×長さ100mmにカットし、島津製作所社製オートグラフAGS-500を用いて、180°方向(測定用サンプルの面に対して平行な方向)における引き剥がし強度を以下の測定条件にて測定した。
測定条件は、銅箔引きで、テストスピードを50mm/minとした。
評価基準は、以下の通りとした。
Excellent:引き剥がし強度が10N/cm以上。
Good:引き剥がし強度が7N/cm以上10N/cm未満。
Poor:引き剥がし強度が7N/cm未満。
(1)サンプルの作製手順
(1-1)カバーレイフィルムの作製
厚さ12.5μmのポリイミドフィルム(カネカ社製、アピカル12.5NPI)の片面に、接着材層となる樹脂組成物を、乾燥後の厚さが15μmとなるように塗布し、160℃、10分の条件で半硬化状態(Bステージ)になるまで乾燥させた。その後、接着材層側に離型PETフィルムを100℃でラミネートすることにより、離型PETフィルム付きカバーレイフィルムを得た。
2層基板(有沢製作所社製、PNS H0509RAC)の銅箔光沢面をエッチング処理して、図1に示す配線の幅(L)と間隔(S)がそれぞれ20μmである配線パターン(以下、L/S=20/20と表現する。)が形成された被着体を得た。
(1-1)で作製したカバーレイフィルムから離型PETフィルムを剥がし、接着材層の面と、(1-2)で作製した被着体の配線が形成された面とが対向するように積層し、185℃、3.0MPa、60秒の条件で加熱加圧した。その後160℃のオーブンで1時間加熱することで測定用サンプルを得た。
配線パターンに電圧がかかるように配線の一端と他端をそれぞれ、機器の配線に接続した。接続後、110℃、85%RH、DC50Vの条件にて200時間後の短絡及びデントライト等の外観変化の有無を目視により確認し評価した。
評価基準は以下の通りとした。
Excellent:200時間後、短絡及び外観変化がなかった。
Good:200時間後、短絡はなかったが、外観変化があった。
Poor:200時間に到達する前に短絡し、外観変化もあった。
(1)サンプルの作製手順
(1-1)カバーレイフィルムの作製
厚さ12.5μmのポリイミドフィルム(カネカ社製、アピカル12.5NPI)の片面に、接着材層となる樹脂組成物を、乾燥後の厚さが15μmとなるように塗布し、160℃、10分の条件で半硬化状態(Bステージ)になるまで加熱した。その後、接着材層側に離型PETフィルムを100℃でラミネートすることにより、離型PETフィルム付きカバーレイフィルムを得た。
被着体として、電解銅箔(JX日鉱日石金属社製、厚さ18μm)の粗面に厚さ25μ
mのポリイミド層が形成された2層基板の銅箔光沢面をエッチング処理して、L/S=50/50、60/60、70/70、80/80、90/90、100/100の配線パターンがそれぞれ形成されたものを得た。
(1-1)で作製したカバーレイフィルムから離型PETフィルムを剥がし、接着材層の面と、(1-2)で作製した被着体の配線が形成された面とが対向するように積層し、185℃、3.0MPa、30秒の条件、及び185℃、3.0MPa、60秒の条件でそれぞれ熱圧着加工(クイックプレス)した。その後160℃のオーブンで1時間加熱した。そして、貼り合わせたサンプルを冷却した後、配線の長手方向と直交するようにサンプルを切断した。その切断面を研磨した後、光学顕微鏡にて観察し、配線埋まり性が良好かどうかを評価した。
評価基準は以下の通りとした。
Excellent:クイックプレスの成型時間が30秒で、配線間の溝に樹脂が行き渡った。
Good:クイックプレスの成型時間が30秒では、配線間の溝に樹脂が行き渡らなかったが、60秒で樹脂が行き渡った。
Poor:クイックプレスの成型時間が30秒の条件及び60秒の条件のいずれの場合も、配線間の溝に樹脂が行き渡らなかった。
容器に、エポキシ樹脂Aを70質量部、エポキシ樹脂Cを30質量部加え、エポキシ樹脂の合計質量部を100質量部とした。これに、硬化剤を10.4質量部、ポリカーボネートジオール由来のポリウレタンAを75質量部、水酸化アルミニウムを90質量部、ジアミノジフェニルスルフォンを10.4質量部、有機溶媒としてメチルエチルケトンを400質量部加えた。その後、これらを室温で撹拌し熱硬化性樹脂組成物を得た。
表2及び3に示すように、各成分の種類及び含有量を変えて実施例1と同様の方法により調整し、熱硬化性樹脂組成物を得た。表中の含有量の単位は特に明記がない限りは質量部である。
Claims (8)
- 25℃において固形のエポキシ樹脂と、25℃において非固形のエポキシ樹脂と、前記非固形のエポキシ樹脂に分散された微粒子ゴムと、硬化剤と、無機充填剤と、ポリカーボネートジオール由来のポリウレタンと、を含み、
前記固形のエポキシ樹脂及び前記非固形のエポキシ樹脂の全質量部数に対して、前記微粒子ゴムの含有量が3~15質量部であり、
前記ポリカーボネートジオール由来のポリウレタンの酸価が10~30mgKOH/gであり、
前記ポリカーボネートジオール由来のポリウレタンの重量平均分子量が15000~50000である、熱硬化性樹脂組成物。 - 前記微粒子ゴムは、コアシェルポリマー粒子から構成される、請求項1に記載の熱硬化性樹脂組成物。
- 前記固形のエポキシ樹脂及び前記非固形のエポキシ樹脂の全質量部数を100質量部としたとき、前記微粒子ゴムと前記非固形のエポキシ樹脂の質量部数が15~40質量部である、請求項1又は2に記載の熱硬化性樹脂組成物。
- 前記固形のエポキシ樹脂及び前記非固形のエポキシ樹脂の全質量部数を100質量部としたとき、前記ポリカーボネートジオール由来のポリウレタンの質量部数が50~100質量部である、請求項1から3のいずれか1項に記載の熱硬化性樹脂組成物。
- 前記固形のエポキシ樹脂及び前記非固形のエポキシ樹脂の全質量部数を100質量部としたとき、前記無機充填剤の質量部数が60~150質量部である、請求項1から4のいずれか1項に記載の熱硬化性樹脂組成物。
- 基材と前記基材の片面に積層された接着材層とから構成され、前記接着材層の接着材が請求項1から5のいずれか1項に記載の熱硬化性樹脂組成物から構成される、カバーレイフィルム。
- 接着シートが請求項1から5のいずれか1項に記載の熱硬化性樹脂組成物から構成される、接着シート。
- 配線が形成された基板と、基材と前記基材の片面に積層された接着材層とから構成されるカバーレイフィルムと、を備え、前記基板の前記配線が形成された面に前記接着材層が接するように前記カバーレイフィルムが設けられたフレキシブルプリント配線板であって、
前記カバーレイフィルムが請求項6に記載のカバーレイフィルムである、フレキシブルプリント配線板。
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