JP2018002826A - Composition for forming cured film and production method of the composition, cured film, light-diffusing laminate, and display device and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composition for forming a cured film, from which a cured film can be formed that develops high light diffusion characteristics even in a thin film state and that has little decrease in the light diffusion characteristics by an overcoat layer, and a production method of the composition, a cured film, a light-diffusing laminate, a liquid crystal display device and a method for manufacturing the device.SOLUTION: The composition for forming a cured film comprises hollow organic particles, a compound having a crosslinking group, and a dispersion medium essentially comprising water. The composition preferably further contains an emulsifier. The composition preferably further contains an initiator. The compound having a crosslinking group preferably comprises a (meth)acrylate compound having two or more functional groups. The hollow organic particle preferably has an inner diameter of 0.05 μm or more and 4 μm or less. The content of the hollow organic particles is preferably 0.5 mass% or more and 60 mass% or less in terms of a solid content.SELECTED DRAWING: None

Description

  The present invention relates to a cured film forming composition and a method for producing the same, a cured film, a light diffusion laminate, a display device, and a method for producing the same.

  In general, a display device such as a liquid crystal display device has a light emitting layered body having a light diffusing layer, a light source such as an LED (Light Emitting Diode), a fluorescent lamp, an incandescent bulb, and various information on the back side opposite to the display screen. It is comprised from the display layer etc. which display. In such a display device, display blur occurs when a light beam transmitted through a certain pixel and a light beam transmitted through a neighboring pixel overlap on the light diffusion layer. In order to prevent this display blur, the light diffusion layer needs to be sufficiently thin and close to the display layer, and is required to exhibit high light diffusion characteristics.

  As a technique for improving the light diffusion characteristics and the like of the light diffusion layer, a method using a composition for forming a cured film in which particles such as silica are dispersed has been proposed (Japanese Patent Laid-Open Nos. 2015-158625 and 2013-72885). No. and JP 2011-184625). However, when the conventional cured film forming composition is used, the light diffusion characteristics of the formed cured film remain insufficient, and another overcoat layer is laminated on the cured film. Then, there is an inconvenience that the light diffusion characteristic is greatly deteriorated.

JP2015-158625A JP2013-72885A JP2011-184625A

  The present invention has been made based on the circumstances as described above, and an object of the present invention is to form a cured film that can exhibit high light diffusion characteristics even when thin and has a small decrease in light diffusion characteristics due to an overcoat layer. It is providing the composition for cured film formation, its manufacturing method, a cured film, a light-diffusion laminated body, a liquid crystal display device, and its manufacturing method.

  The invention made in order to solve the above problems includes hollow organic particles (hereinafter also referred to as “[A] particles”), a compound having a crosslinkable group (hereinafter also referred to as “[B] compound”), water, Is a composition for forming a cured film containing a dispersion medium having a main component as a main component (hereinafter also referred to as “[C] dispersion medium”).

  Another invention made to solve the above problems is a method for producing a cured film forming composition comprising a step of mixing [A] particles, a [B] compound, and a [C] dispersion medium.

  Yet another invention made to solve the above-described problems is a cured film formed from the cured film-forming composition.

  Still another invention made in order to solve the above-mentioned problem comprises a base material and a light diffusion layer laminated on at least one surface side of the base material, and the light diffusion layer is formed of the cured film. It is a light diffusion laminate.

  Yet another invention made to solve the above-described problems is a display device including the light diffusion laminate.

  Yet another invention made in order to solve the above-mentioned problem is a method for manufacturing a display device comprising a display unit and a light diffusion laminate, and [A] particles on at least one surface side of the substrate, The step of applying a composition for forming a cured film containing a compound [B] and [C] a dispersion medium, and the light diffusing laminate obtained by the coating step are arranged on the display side of the display section or the And a step of arranging on the opposite side.

  Here, the “main component” is a component having the largest content, for example, a component having a content of 50% by mass or more.

  According to the composition for forming a cured film of the present invention, it is possible to form a cured film that can exhibit high light diffusion characteristics even when it is thin and has a small decrease in light diffusion characteristics due to the overcoat layer. According to the method for producing a cured film forming composition of the present invention, such a cured film forming composition can be produced easily and reliably. The cured film and the light diffusion laminate of the present invention can exhibit high light diffusion characteristics even when they are thin, and the deterioration of the light diffusion characteristics due to the overcoat layer is small. According to the display device of the present invention, image blur can be reduced. According to the display device manufacturing method of the present invention, such a display device can be manufactured easily and reliably.

<Composition for forming cured film>
The composition for forming a cured film contains [A] particles, a [B] compound, and a [C] dispersion medium. The composition for forming a cured film is used, for example, to form a cured film (hard coat layer) by coating on at least one surface of a substrate.

  Even if the said composition for cured film formation is thin, it can exhibit a high light-diffusion characteristic, and can form the cured film with a small fall of the light-diffusion characteristic by an overcoat layer. Although it is not necessarily clear why the cured film forming composition has the above-described configuration, the following effects can be inferred, for example. That is, [A] hollow organic particles are considered to suppress backscattering, have high light utilization efficiency, and are excellent in light diffusion characteristics. By using such [A] particles dispersed in a dispersion medium containing [C] water as a main component, erosion, deformation, etc. of the [A] particles due to an organic solvent or the like can be suppressed, and excellent [ A] The light diffusion characteristics of the particles can be maintained. As a result, a cured film formed from the composition for forming a cured film can exhibit high light diffusion characteristics even if it is thin. In addition, since the influence of the composition or the like forming the overcoat layer can be suppressed, it is possible to reduce the decrease in the light diffusion characteristics due to the overcoat layer, and to maintain the high light diffusion characteristics of the cured film. Conceivable.

  The cured film forming composition may contain [D] emulsifier, [E] initiator and [F] wetting agent as suitable components in addition to the [A] to [C] components. In the range which does not impair the effect of, other optional components may be contained. Hereinafter, each component will be described in detail. In addition, unless otherwise indicated, each component illustrated below can be used individually by 1 type or in combination of 2 or more types.

[[A] particles]
[A] The particles are hollow organic particles. “Hollow organic particles” refers to particles having an organic polymer as a main component and a space inside.

  “Organic polymer” refers to a polymer obtained by polymerizing an organic monomer. Examples of the organic monomer include a non-crosslinkable monomer and a crosslinkable monomer.

  [A] The lower limit of the outer diameter of the particles is preferably 0.1 μm, more preferably 0.2 μm, and even more preferably 0.3 μm. The upper limit of the outer diameter is preferably 5 μm, more preferably 4 μm, further preferably 3 μm, and particularly preferably 2 μm. By setting the outer diameter of the [A] particles in the above range, the dispersibility of the [A] particles can be further increased, and as a result, the light diffusion characteristics can be further improved.

  [A] The lower limit of the inner diameter of the particles is preferably 0.05 μm, more preferably 0.1 μm, and even more preferably 0.15 μm. The upper limit of the inner diameter is preferably 4 μm, more preferably 3 μm, still more preferably 2 μm, and particularly preferably 1 μm. By setting the inner diameter of the [A] particles in the above range, the light diffusion characteristics of the cured film containing the [A] particles can be further enhanced. [A] The outer diameter and inner diameter of the particles can be measured by, for example, observing with a transmission electron microscope after drying the [A] particles in the case of the composition for forming a cured film. In the case of a cured film, it can be measured by cutting the cured film with a focused ion beam and observing the cut surface with a scanning electron microscope.

[A] The lower limit of the hollowness of the particles is preferably 10%, more preferably 15%, and even more preferably 18%. The upper limit of the hollow ratio is preferably 90%, more preferably 70%, and still more preferably 60%. [A] By setting the hollowness of the particles in the above range, the light diffusion characteristics can be further improved. [A] The void ratio (%) of the particles is a value obtained by (particle inner diameter / particle outer diameter) ³ × 100 from the inner diameter and outer diameter of the [A] particles.

  [A] The particles usually have a single hole, but may have a plurality of holes, and may contain dish-like particles by-produced in the production process. From the viewpoint of improving the light diffusion characteristics, the upper limit of the content of the dish-like particles is preferably 50% by mass and more preferably 30% by mass with respect to the total solid content of the [A] particles.

  [A] The particles are preferably used as an aqueous dispersion to be handled in a dispersion medium containing water as a main component from the viewpoint of improving light diffusion characteristics.

  [A] The lower limit of the solid content concentration in the aqueous dispersion of particles is preferably 5% by mass, more preferably 10% by mass, and even more preferably 15% by mass. As an upper limit of the said solid content concentration, 65 mass% is preferable, 50 mass% is more preferable, and 40 mass% is further more preferable.

  [A] As a minimum of content of particles, 0.5 mass% is preferred, 5 mass% is more preferred, and 10 mass% is still more preferred in conversion of solid content. As an upper limit of the said content, 60 mass% is preferable, 50 mass% is more preferable, and 40 mass% is further more preferable. “Solid content conversion” refers to the content ratio in the sum of components excluding the dispersion medium contained in the [C] dispersion medium and [A] particles in the cured film forming composition.

  [A] As a method for producing the particles, for example, (i) an organic monomer is emulsion-polymerized to prepare an aqueous dispersion of polymer particles, and the surface layer of the polymer particles is coated with another organic monomer. Forming a core-shell particle, and neutralizing and swelling the core-shell particle with a volatile base or the like (see Japanese Patent No. 5098173), (ii) adding a foaming agent to the polymer particle, and then the foaming agent (Iii) A method of encapsulating a volatile substance such as butane in the polymer and then gasifying and swelling the volatile substance, and (iv) melting the polymer and blowing a gas jet such as air into the polymer. (V) a method in which a w / o / w type monomer emulsion is prepared and polymerized, (vi) in a suspension in which a pigment is suspended in an unsaturated polyester solution, (Vii) a two-stage crosslinking method in which crosslinked polymer particles are used as seeds, and polymers having different compatibility are polymerized and crosslinked on the seeds, and (viii) a method of producing by polymer polymerization shrinkage 62-127336 publication).

  Among these, the methods (i) and (viii) are preferable from the viewpoint of further improving the light diffusion characteristics.

[[B] Compound]
[B] The compound is a compound having a crosslinkable group. “Crosslinkable group” refers to a group capable of forming a covalent bond between the same or different molecules. The compound [B] is spontaneously polymerized by heating, and the resulting polymer serves as a base material for a cured film formed from the cured film-forming composition.

Examples of the crosslinkable group include a polymerizable carbon-carbon double bond-containing group such as a vinyl group, a (meth) acryloyl group, and a styryl group;
Examples thereof include an epoxy group, a thiylyl group, an oxetanyl group, and a vinyl ether group. Among these, a polymerizable carbon-carbon double bond-containing group is preferable and a (meth) acryloyl group is more preferable from the viewpoint of improving the light diffusion characteristics and hardness of the cured film.

  [B] The number of crosslinkable groups in the compound is not particularly limited, but from the viewpoint of improving hardness, the lower limit of the number of crosslinkable groups is preferably 2, more preferably 3, and even more preferably 4. The upper limit of the number is preferably 20, more preferably 15, and still more preferably 12.

  [B] The compound preferably contains a bifunctional or higher functional (meth) acrylate compound.

  Examples of the bifunctional (meth) acrylate compound include ethylene glycol di (meth) acrylate, 1,3-butanediol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, and 1,6-hexanediol. Di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, dipropylene glycol di (meth) Examples include acrylate, bis (2-hydroxyethyl) isocyanurate di (meth) acrylate, and ethoxylated bisphenol A di (meth) acrylate.

  Examples of the trifunctional (meth) acrylate compound include trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, glycerin tri (meth) acrylate, and tris (2-hydroxyethyl) isocyanurate tri (meth) acrylate. Etc.

  Examples of tetrafunctional or higher functional (meth) acrylate compounds include dipentaerythritol polyacrylates such as pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and ditrimethylolpropane tetra. Ethylene oxide to hydroxyl groups such as (meth) acrylate, oligoester (meth) acrylates having 4 or more (meth) acryloyl groups, oligoether (meth) acrylates, oligoepoxy (meth) acrylates, dipentaerythritol Or the propylene oxide adduct poly (meth) acrylate etc. are mentioned.

  As the bifunctional or higher functional (meth) acrylate compound, in addition to the above compound, a polyfunctional urethane acrylate having a urethane group and two or more (meth) acryloyl groups can also be used. Examples of the polyfunctional urethane acrylate include 2: 1 adduct of dipentaerythritol penta (meth) acrylate and hexamethylene diisocyanate (10 functional urethane acrylate), 2: 1 of pentaerythritol tri (meth) acrylate and isophorone diisocyanate. Examples include adducts (hexafunctional urethane acrylate). As a commercial item of the said polyfunctional urethane acrylate, for example, UA-W2A (bifunctional urethane acrylate) of Shin-Nakamura Chemical Co., Ltd., U-6LPA (hexafunctional urethane acrylate), KAYARAD DPHA-40H (10 functional) Urethane acrylate) and the like.

  [B] The lower limit of the molecular weight of the compound is preferably 100, more preferably 200, even more preferably 300, and particularly preferably 400. The upper limit of the molecular weight is preferably 5,000, more preferably 3,000, still more preferably 2,000, and particularly preferably 1,500. By setting the molecular weight of the [B] compound within the above range, a cured film that is superior in hardness can be formed.

  As the compound [B], in addition to those exemplified above, for example, JP-A-2001-233828, JP-A-2002-012651, JP-A-2009-297271, JP-A-2015-054461, JP-A Examples thereof include bifunctional or higher functional (meth) acrylate compounds described in JP-A-2015-146243, JP-A-2015-147828, JP-A-2015-147952, and the like.

  Among these, [B] compounds include dipentaerythritol polyacrylate, dipentaerythritol hexaacrylate, dipentaerythritol pentaacrylate, dipentaerythritol tetraacrylate, dipentaerythritol triacrylate, pentaerythritol tetraacrylate, pentaerythritol triacrylate. Acrylate, hexaacrylate of ethylene oxide adduct of dipentaerythritol, modified hexaacrylate, polyfunctional urethane acrylate having urethane group and two or more (meth) acryloyl groups, polyethylene glycol diacrylate, polypropylene glycol diacrylate, polytetramethylene Glycol diacrylate and ethoxylated bisphenol A diacrylate are preferred , Dipentaerythritol polyacrylate, dipentaerythritol hexaacrylate, 2 with dipentaerythritol pentaacrylate hexamethylene diisocyanate: 1 adduct and ethoxylated bisphenol A diacrylate is more preferable.

  As a minimum of content of the [B] compound in the said composition for cured film formation, 40 mass% is preferable in conversion of solid content, 50 mass% is more preferable, 60 mass% is further more preferable, 70 mass% is 70 mass%. Particularly preferred. As an upper limit of the said content, 99 mass% is preferable, 95 mass% is more preferable, and 90 mass% is further more preferable. By making content of a [B] compound into the said range, the light-diffusion characteristic and intensity | strength of a cured film can be improved more.

  As a minimum of content with respect to 100 mass parts of [A] particles (solid content) of a [B] compound in the composition for cured film formation, 50 mass parts are preferred, 100 mass parts are more preferred, and 200 mass parts are preferred. Further preferred. The upper limit of the content is preferably 100,000 parts by mass, more preferably 20,000 parts by mass, and even more preferably 5,000 parts by mass. By making content of a [B] compound into the said range, the light-diffusion characteristic and intensity | strength of a cured film can be improved more.

[[C] Dispersion medium]
[C] The dispersion medium contains water as a main component. [C] The dispersion medium may be a dispersion medium containing only water or a mixed dispersion medium containing water and an organic solvent. [C] As the dispersion medium, a dispersion medium containing only water is preferable from the viewpoint of environmental load and the like.

  The organic solvent is not particularly limited as long as it is an organic medium soluble in water, and examples thereof include alcohols and ethers. Examples of the alcohols include methanol, ethanol, n-propyl alcohol, i-propyl alcohol, n-butyl alcohol, sec-butyl alcohol, t-butyl alcohol, isobutyl alcohol, n-hexyl alcohol, n-octyl alcohol, and ethylene. Examples include glycol, propylene glycol, diethylene glycol, triethylene glycol, diacetone alcohol and the like. Examples of the ethers include ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether and the like.

  [C] When the dispersion medium contains an organic solvent, the upper limit of the content of the organic solvent is, for example, 10% by mass.

[[D] emulsifier]
[D] An emulsifier is a compound that exhibits a surface active action and can enhance dispersibility in a [C] dispersion medium such as [A] particles and [B] compounds.

  [D] Examples of the emulsifier include compounds represented by the following formula (1).

In the above formula (1), X is a monovalent group having an aromatic ring, an ethylenic double bond, or a combination thereof. R ¹ is an alkylene group having 2 to 4 carbon atoms. n is an integer of 5 to 150. A plurality of R ¹ may be the same or different. R ² is a hydrogen atom, —PO (OM) ₂ , —SO ₃ M, or a monovalent ethylenic double bond-containing group. Each M is independently a hydrogen atom, an ammonium group or a metal atom.

  Examples of the aromatic ring of the monovalent group represented by X include a benzene ring, a naphthalene ring, an anthracene ring, and a phenanthrene ring. In addition, when said X has an aromatic ring, this aromatic ring may be unsubstituted and may be substituted by the alkyl group, the aryl group, these combinations, etc.

  Examples of the monovalent group represented by X include a group represented by the following formula (2), an alkenyl group such as a vinyl group, an allyl group, and a 3-pentenyl group, a (meth) acryloyl group, and an allyl ether group. Can be mentioned. Among these, X is preferably a group represented by the following formula (2).

In the above formula (2), R ³ and R ⁴ are each independently a hydrogen atom or an alkyl group. m is an integer of 1-3. When m is 2 or 3, the plurality of R ⁴ may be the same or different. * Shows the site | part couple | bonded with the oxygen atom in the said Formula (1).

Examples of the alkyl group represented by R ³ and R ⁴ include alkyl groups having 1 to 3 carbon atoms such as a methyl group, an ethyl group, and a propyl group.

  As said m, 1 and 2 are preferable.

Examples of the alkylene group having 2 to 4 carbon atoms represented by R ¹ include an ethylene group, an n-propylene group, an i-propylene group, an n-butylene group, and an i-butylene group.

Examples of the monovalent ethylenic double bond-containing group represented by R ² include an alkenyl group such as vinyl group, allyl group, and 3-pentenyl group, (meth) acryloyl group, allyl ether group, and these groups. cation and -SO ₃ ammonium ions having ^- as a substituent such as an ionic group which is formed by the anionic group of the like.

  Examples of the metal ion represented by M include alkali metal ions such as sodium, potassium, and lithium.

  [D] As the emulsifier, nonionic emulsifiers, anionic emulsifiers and the like other than the compound represented by the above formula (1) can also be used.

  Examples of the nonionic emulsifier include polyethylene glycol or polyalkylene glycol alkyl ester, fatty acid ester, sorbitan fatty acid ester, sorbitol fatty acid ester, alkyl ether, alkylphenyl ether, and the like.

  Examples of the anionic emulsifier include rosin salts such as potassium rosinate and sodium rosinate, potassium oleate, potassium laurate, sodium laurate, sodium stearate, potassium stearate, and other fatty acid sodium salts or potassium salts, lauryl Examples thereof include sulfate esters of aliphatic alcohols such as sodium sulfate, and alkylaryl sulfonates such as sodium dodecylbenzenesulfonate.

[D] A reactive emulsifier can also be used as an emulsifier. Examples of the reactive emulsifier include a compound in which the monovalent group represented by X has an ethylenic double bond among the compounds represented by the formula (1), and the R ² is monovalent ethylenic. A compound that is a double bond-containing group, a compound in which the monovalent group represented by X has an ethylenic double bond, and R ² is a monovalent ethylenic double bond-containing group. It is done. Moreover, as a commercial item of the said reactive emulsifier, latemul S-180A, latemul PD-104, PD-105, PD-420, PD-430 (above, Kao company), Eleminol JS-2 (Sanyo Kasei company), for example , AQUALON KH-10, AQUALON BC-20, AQUALON RN-20, AQUALON RN-30, AQUALON RN-50 (above, Daiichi Kogyo Seiyaku Co., Ltd.), ADEKA rear soap SE-10N, SR-10N (above, ADEKA) ), Antox MS-60, RE1000 (above, Nippon Emulsifier Co., Ltd.), Surfmer FP-120 (Toho Chemical Industry Co., Ltd.) and the like.

  [D] As the emulsifier, a compound represented by the above formula (1) is preferable, and a polyoxyethylene polycyclic phenyl ether sulfate salt is more preferable.

  When the composition for forming a cured film contains a [D] emulsifier, the lower limit of the content of the [D] emulsifier in the composition for forming a cured film is preferably 0.01% by mass in terms of solid content. 0.1 mass% is more preferable, 0.5 mass% is further more preferable, and 1 mass% is especially preferable. As an upper limit of the said content, 30 mass% is preferable, 20 mass% is more preferable, and 10 mass% is further more preferable. [D] By making content of an emulsifier into the said range, a light-diffusion characteristic can be improved more.

[[E] initiator]
[E] The initiator generates active species by light irradiation or heating, and can promote the polymerization of the [B] compound and the like, thereby improving the strength of the cured film. [E] The initiator may be a water-soluble compound or an oil-soluble compound.

  Examples of the [E] initiator (photoinitiator) that generates active species by light irradiation include acetophenone, acetophenone benzyl ketal, 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy-1,2-diphenylethane-1- ON, 3-methylacetophenone, 4,4′-dimethoxybenzophenone, 4,4′-diaminobenzophenone, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 2-hydroxy-2 -Methyl-1-phenylpropan-1-one, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propan-1-one, 2-benzyl-2-dimethylamino-1- (4 -Morpholinophenyl) -butanone-1,4- (2-hydroxyethoxy) phenyl- (2-H Roxy-2-propyl) ketone, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, bis- (2,6-dimethoxybenzoyl) -2,4,4-trimethylpentylphosphine oxide, oligo (2-hydroxy-2- Methyl-1- (4- (1-methylvinyl) phenyl) propanone) and the like.

  Examples of commercially available photoinitiators include Irgacure 184 (above, BASF).

[E] initiators (thermal initiators) that generate active species upon heating include, for example, hydroperoxides, peroxyesters, dialkyl peroxides, peroxyesters, diacyl peroxides, peroxydicarbonate , Organic peroxides such as peroxyketals and ketone peroxides;
Persulfates such as ammonium persulfate, sodium persulfate, potassium persulfate;
1,1′-azobis (cyclohexane-1-carbonitrile), 2,2′-azobis (N-butyl-2-methylpropionamide), 4,4′-azobis (4-cyanopentanoic acid), 2,2 '-Azobis [2-methyl-N- (2-hydroxyethyl) propionamide], 2,2'-azobis [N- (2-propenyl) -2-methylpropioamide], 1-[(1-cyano And azo compounds such as -1-methylethyl) azo] formamide.

  Examples of commercially available thermal initiators include V-601, V-59, VF-096, VA-067, VE-073, VPS-1001, VPE-0201, VAm110 (above, Wako Pure Chemical Industries). Can be mentioned.

  [E] In addition to those exemplified above, for example, JP-A-2014-806, JP-A-2014-52493, JP-A-2014-199320, JP-A-2015-071741 Examples include the initiators described.

  [E] Among these, a photoinitiator is preferable as the initiator.

  When the said composition for cured film formation contains an [E] initiator, as a minimum of content of the [E] initiator in the said composition for cured film formation, 0.01 mass% in conversion of solid content Is preferable, 0.1 mass% is more preferable, 1 mass% is further more preferable, and 1.5 mass% is especially preferable. As an upper limit of the said content, 50 mass% is preferable, 30 mass% is more preferable, 20 mass% is further more preferable, 10 mass% is especially preferable. [E] By making content of an initiator into the said range, the hardness of a cured film can be improved more.

[[F] wetting agent]
[F] The wetting agent is a component that can suppress repelling or the like when the composition for forming a cured film is applied and can further improve the uniformity of the cured film. [F] Wetting agents differ from the above-mentioned [D] emulsifiers in terms of function. [F] Examples of the wetting agent include polyorganosiloxane surfactants, fluorine surfactants, acetylene glycol surfactants, and acrylic polymer surfactants.

  [F] Examples of the wetting agent include the wetting agents described in JP 2013-18921 A, JP 2014-133807 A, JP 2014-162889 A, and the like. [F] As the wetting agent, these wetting agents may be used as they are, or may be condensed.

  When the said composition for cured film formation contains a [F] wetting agent, as a minimum of content of the [F] wetting agent in the said composition for cured film formation, 0.01 mass% in conversion of solid content Is preferable, 0.1 mass% is more preferable, and 0.2 mass% is further more preferable. As an upper limit of the said content, 10 mass% is preferable, 5 mass% is more preferable, and 3 mass% is further more preferable. [F] By making content of a wetting agent into the said range, the repelling etc. at the time of coating the said composition for cured film formation can be suppressed more.

[Other optional ingredients]
The cured film forming composition further contains, as other optional components, for example, a polymerization inhibitor, an antifoaming agent, an antiseptic, an antioxidant, a thickener, a plasticizer, an ultraviolet absorber, a colorant, and the like. Also good.

[Polymerization inhibitor]
The polymerization inhibitor can improve the storage stability of the composition for forming a cured film by suppressing the polymerization of the [B] compound during storage. Examples of commercially available polymerization inhibitors include p-methoxyphenol, phenothiazine, BHT (above, Wako Pure Chemical Industries, Ltd.), IRGANOX1010, IRGANOX1035 (above, BASF), Sumilizer GA-80 (Sumitomo Chemical Co.), and Kinopower QS. -30, Kinopower QS-W10 (above, Kawasaki Kasei Kogyo Co., Ltd.) and the like. When the said composition for cured film formation contains the said polymerization inhibitor, as an upper limit of content of a polymerization inhibitor, 1 mass% is preferable in conversion of solid content, and 0.5 mass% is more preferable. By making content of the said polymerization inhibitor into the said range, the polymerizability of a [B] compound and the storage stability of the said composition for cured film formation can be improved with balance.

  The lower limit of the solid content concentration of the cured film forming composition is preferably 0.1% by mass, more preferably 1% by mass, and still more preferably 10% by mass. The upper limit of the solid content concentration of the cured film forming composition is preferably 50% by mass, more preferably 40% by mass, and even more preferably 35% by mass. By making solid content concentration of the said composition for cured film formation into the said range, coating property can be improved more.

  The upper limit of the total content of alkali metal ions in the cured film forming composition is preferably 1,000 ppm, more preferably 500 ppm, still more preferably 300 ppm, and particularly preferably 100 ppm. As a minimum of the above-mentioned content, it is 10 ppm, for example. When the cured film formed from the cured film-forming composition is used, for example, as an electrode-forming substrate by setting the total content of alkali metal ions in the cured film-forming composition within the above range. The insulation performance can be improved.

<Method for producing cured film-forming composition>
The manufacturing method of the said composition for cured film formation is equipped with the process (mixing process) of mixing [A] particle | grains, a [B] compound, and a [C] dispersion medium. According to the method for producing the cured film forming composition, the cured film forming composition can be produced easily and reliably.

  From the viewpoint of improving dispersibility, the order of mixing the components [A] to [C] in the mixing step is as follows. First, the [B] compound and the [C] dispersion medium are mixed, and this mixture is mixed with [A]. It is preferable to mix the particles.

  When the composition for forming a cured film further contains [D] an emulsifier, the order of mixing each component of [A] to [D] in the mixing step is [B] from the viewpoint of improving dispersibility. It is preferable to mix the compound and [D] emulsifier, add [C] dispersion medium to this mixture to obtain a dispersion of [B] compound, and mix [A] particles with this dispersion.

  Although it does not specifically limit as a mixing method in a mixing process, General methods, such as a stirring mixing method, can be employ | adopted and it is preferable to use an ultrasonic disperser.

  The temperature in the mixing step is, for example, 0 ° C. or higher and 50 ° C. or lower from the viewpoint of suppressing denaturation of each component.

<Curing film>
The cured film is formed from the cured film-forming composition described above. Since the said cured film is formed from the above-mentioned composition for cured film formation, it has the outstanding hardness and is excellent in the light-diffusion characteristic.

  The lower limit of the average thickness of the cured film is preferably 0.1 μm, more preferably 0.5 μm, and even more preferably 1 μm. The upper limit of the average thickness is preferably 30 μm, more preferably 20 μm, and even more preferably 10 μm. By setting the average thickness of the cured film within the above range, the hardness and light diffusion characteristics can be sufficiently expressed.

<Laminated body>
A laminate can be obtained by coating the composition for forming a cured film on at least one surface of the substrate and laminating the cured film. That is, the laminate includes a base material and a cured film laminated on at least one surface of the base material, and the cured film is formed by the cured film forming composition. The average total thickness of the laminate is, for example, 10 μm or more and 1,000 μm or less.

<Method for producing laminate>
The manufacturing method of the said laminated body is the process (coating process) which heats the coating film obtained by the process (coating process) which coats the said composition for cured film formation to one side of a base material, and the said coating process. Step). When using a resin film as a base material, the manufacturing method of the said laminated body is good to further provide the process (stretching process) of extending | stretching the said resin film after the said coating process. According to the method for manufacturing the laminate, the laminate can be easily and reliably manufactured. Hereinafter, each step will be described.

[Coating process]
In this step, the cured film forming composition is applied to one surface of the substrate.

  Examples of the substrate include a glass plate and a resin film. As a resin film, the unstretched resin film which shape | molded the resin material in the sheet form, the stretched resin film which extended | stretched this unstretched resin film, etc. can be used, for example.

  The unstretched resin film can be obtained by molding a resin material into a sheet shape by, for example, a melt extrusion method, a melt flow method, a calendar method, or the like. As a method for molding the resin material, a melt extrusion method is preferable. Examples of the molding apparatus used in the melt extrusion method include a single screw extruder and a twin screw extruder. The melting temperature in the melt extrusion method is, for example, 200 ° C. or more and 300 ° C. or less. As the resin material, a pellet-shaped thermoplastic resin is preferable. In this case, the pellet-shaped thermoplastic resin may be sufficiently dried in advance. The unstretched resin film formed into a sheet is preferably wound and solidified by winding it around a cooling roll of, for example, 0 ° C. or more and 50 ° C. or less by an electrostatic application casting method.

  The stretched resin film is obtained by stretching the unstretched resin film in the longitudinal direction (flow direction) or the short direction. As the stretched resin film, one obtained by stretching the unstretched resin film in the longitudinal direction (flow direction) is preferable. Examples of a method of stretching the unstretched resin film in the longitudinal direction include a method of stretching 2 to 5 times with a heated roll. As a minimum of the above-mentioned roll temperature, 80 ° C is preferred. On the other hand, the upper limit of the roll temperature is preferably 120 ° C, more preferably 100 ° C. Examples of the method of stretching the unstretched resin film in the lateral direction include a method of gripping the end portion by an appropriate method such as clipping and drawing it to the hot air zone to stretch 2.5 times to 5 times. It is done. As a minimum of the temperature of a hot air zone, 70 ° C is preferred and 80 ° C is more preferred. On the other hand, as an upper limit of the temperature of a hot air zone, 140 degreeC is preferable and 120 degreeC is more preferable.

  The method for applying the cured film forming composition to the substrate is not particularly limited, but gravure coating method, die coating method, spray coating method, wire bar coating method, reverse roll coating method, curtain coating method, dip coating. Law.

  The shape of the substrate is usually a plate shape or a film shape. When the shape of a base material is plate shape or film shape, as the average thickness, it can be set as 1 micrometer or more and 800 micrometers or less, for example.

  When the substrate is made of resin, the resins include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polypropylene, ethylene-vinyl acetate copolymer, polycarbonate, polyamide, polyimide, polyamideimide, polyphenylene ether, polyphenylene sulfide, poly Arylate and polysulfone are preferred, and polyethylene terephthalate is more preferred.

(Stretching process)
In this step, a resin film having the cured film forming composition applied thereon is stretched on at least one surface. The direction in which the resin film is stretched may be the longitudinal direction (flow direction), the transverse direction, or both the longitudinal direction and the transverse direction. When the resin film is a stretched resin film, this stretched resin film The direction which was not stretched at the time of manufacture of is preferable. Examples of the method for stretching the resin film include the same methods as those exemplified above as the method for stretching the unstretched resin film.

[Heating process]
In this step, the coating film obtained by the coating step is heated. By this step, the [B] compound of the composition for forming a cured film is polymerized, and as a result, the coating film is cured to form a cured film. Moreover, when the said resin film is extended | stretched at the extending process, the crystal orientation of the said resin film can be accelerated | stimulated. The heating temperature is, for example, 160 ° C. or higher and 240 ° C. or lower. Moreover, as said heating time, it is 1 second or more and 60 seconds or less, for example.

When the said composition for cured film formation contains the [E] initiator which generate | occur | produces active species by light irradiation, it is good to light-irradiate the coating film obtained by the said coating process before the said heating process. Thus, before the said heating process, generation | occurrence | production of the active species from the [E] initiator which the said composition for cured film formation contains can be accelerated | stimulated by irradiating the said coating film with light. Examples of the light irradiation method include ultraviolet irradiation using a high-pressure mercury lamp. The irradiation amount of the light irradiation is, for example, 1,000 J / m ² or more and 5,000 J / m ² or less.

  Since the laminated body which formed the cured film is excellent in surface hardness etc., it can be used suitably as surface protection films, such as a flat panel display, a solar cell, a touch panel, an antireflection film. Moreover, the laminated body which formed the cured film can be used for various uses as various materials, such as a building material and a vehicle, besides the above-mentioned use.

<Light diffusion laminate>
The cured film formed from the cured film-forming composition has excellent light diffusion characteristics even after overcoating while maintaining excellent hardness. Can be suitably used as a light diffusion laminate.

  The said light-diffusion laminated body is equipped with the base material and the light-diffusion layer laminated | stacked on this base material, and the said light-diffusion layer is formed of the said cured film.

  Examples of the substrate include those exemplified as the substrate in the laminate. Among these, as the substrate in the light diffusion laminate, a transparent substrate is preferable, and a resin film is more preferable. When the substrate is plate-shaped or film-shaped, the average thickness of the substrate can be, for example, 1 μm or more and 800 μm or less.

  The lower limit of the average thickness of the cured film forming the light diffusion layer in the light diffusion laminate is preferably 1 μm, more preferably 3 μm, and even more preferably 5 μm. The upper limit of the average thickness is preferably 50 μm, more preferably 30 μm, and even more preferably 10 μm.

  The lower limit of the haze value of the light diffusion laminate is preferably 40%, more preferably 50%, and even more preferably 55%. The upper limit of the haze value is preferably 99%, more preferably 95%. The haze value of the light diffusion laminate is a value measured by ASTM D1003.

  As a minimum of the haze after overcoat of the light diffusion layered product, 40% is preferred, 50% is more preferred, and 55% is still more preferred. The upper limit of the haze value after overcoating is preferably 99%, more preferably 95%. “Haze value after overcoating” means a transparent film on which the composition for forming a transparent member is applied and cured on the surface opposite to the base of the cured film of the light diffusion laminate, and then laminated on the cured film. The haze value when formed.

  The upper limit of the difference in cloudiness before and after overcoating of the light diffusion laminate is preferably 25%, more preferably 10%, further preferably 5%, and further preferably 3%. The lower limit of the difference is, for example, 0%. In the light diffusion laminate, since the light diffusion layer is formed of a cured film obtained from the cured film forming composition described above, the light diffusion layer is excellent in light diffusion characteristics and maintains light diffusion characteristics even after overcoating. Can do.

  The light diffusion laminate can be suitably used as, for example, a diffuser disposed in a display device such as a front diffuser of a reflective liquid crystal display device, a light diffusion film for a backlight unit of a transmissive liquid crystal display device, or the like.

<Display device>
The display device includes the light diffusion laminate. Since the display device includes the light diffusion laminate having the above-described characteristics as a diffuser, a light diffusion film, or the like, image blur can be reduced.

  Examples of the display device include a liquid crystal display device and an EL display device. As the liquid crystal display device, a reflection type liquid crystal display device using light from the front light or the outside, a transmissive liquid crystal display device using light from a light source such as a backlight, and the light from the outside and the light source are used. Examples thereof include a transflective liquid crystal display device using both.

  In addition to the light diffusion laminate, the display device further includes, for example, a display unit (display panel), a polarizing plate, a retardation plate, an antireflection member, a color filter, an antireflection member, a glass substrate, a backlight unit, and the like. it can.

<Manufacturing method of display device>
The manufacturing method of the said display apparatus provided with a display part and a light-diffusion laminated body is the hardening containing [A] particle | grains, a [B] compound, and a [C] dispersion medium in the at least one surface side of a base material. A step of coating a film-forming composition (hereinafter also referred to as “cured film-forming composition (I)”) (hereinafter also referred to as “coating step”) and a light diffusion obtained by the coating step And a step of arranging the laminate on the display side of the display unit or on the opposite side thereof (hereinafter also referred to as “arrangement step”). According to the method for manufacturing a display device of the present invention, a display device with reduced image blur can be manufactured easily and reliably.

[Coating process]
In this step, the cured film forming composition (I) is applied to one surface side of the substrate.

  The cured film forming composition (I) is as described in the section of the cured film forming composition. As a base material and the coating method, what was illustrated as a base material in the above-mentioned laminated body and a coating method is mentioned.

[Arrangement process]
In this step, the light diffusion laminate obtained by the coating step is disposed on the display side of the display unit or on the opposite side. The display side of the display unit means a viewing side in the display device. For example, when the display device is a reflective liquid crystal display device, the light diffusion laminate as the front diffuser is arranged on the display side of the display unit. When the display device is a transmissive liquid crystal display device, the light diffusion laminate as the light diffusion film is disposed between the backlight unit on the opposite side to the display side of the display unit or the like.

  Examples of the display unit include a liquid crystal display panel and an EL display panel.

  In the arrangement step, in addition to the light diffusion laminate and the display unit, for example, a polarizing plate, a phase difference plate, a color filter, an antireflection member, a glass substrate, a backlight unit, and the like can be further arranged.

<Other embodiments>
The preferred embodiments of the present invention have been described above, but the present invention is not limited to these embodiments. For example, in the preferred embodiment described above, an example in which the cured film forming composition of the present invention was applied to the production of a laminate having a base material whose main component is a resin, but the present invention is not limited thereto. The present invention can also be applied to the production of a laminate having a base material mainly composed of a material other than a resin such as metal, glass, and ceramics.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these Examples. The measuring method of various physical property values is shown below.

[Weight average molecular weight (Mw) and number average molecular weight (Mn)]
Mw and Mn of the polymer are gel permeation chromatographs (“HLC-8020” manufactured by Tosoh Corporation) and GPC columns (“Guard Column H _XL- H”, “TSKgel G7000H _XL ”, “TSKgelGMH _XL ” manufactured by Tosoh Corporation). 2 "and" TSKgel G2000H _XL "sequentially connected), elution solvent: tetrahydrofuran, flow rate: 1 mL / min, column temperature: 40 ° C., sample concentration: 0.7% by mass, injection amount: 70 μL And measured by GPC using monodisperse polystyrene as a standard.

[Solid content]
The solid content concentration in the composition for forming a cured film, [A] aqueous dispersion of particles, [D] emulsifier, etc., was placed in an aluminum dish and heated on a hot plate at 140 ° C. for 30 minutes. It was calculated from the mass change before and after heating.
Solid content concentration (%) = (sample mass after heating at 140 ° C. for 30 minutes / sample weight before heating) × 100

[Outer diameter and inner diameter of hollow organic particles and hollow ratio]
After drying the aqueous dispersion of hollow organic particles, the outer diameter and inner diameter of 20 arbitrary hollow particles are measured using a transmission electron microscope (H-7650 manufactured by Hitachi High-Tech Fielding Co., Ltd.), and the average value is calculated. The values were the inner diameter and outer diameter, respectively. The hollow ratio is the ratio of the hollow volume to the particle volume, and was calculated using the following formula.
Hollow ratio (%) = (particle inner diameter / particle outer diameter) ³ × 100

<Production of [A] aqueous dispersion of particles>
[Preparation Example 1] (Production of aqueous dispersion of hollow particles (a) having chemically crosslinked shells)
According to the method described in the examples of Patent No. 5181566 publication "Production of hollow substrate particles (A-1)", "particulate heterogeneous polymer production of (a _d)" and the hollow substrate particles (A- An aqueous dispersion of hollow particles (a) similar to 1) was obtained. The hollow particles (a) have a chemically crosslinked shell. The aqueous dispersion was dried and observed with a transmission electron microscope. As a result, the hollow particles (a) were completely spherical hollow organic particles having a transparent central portion, an outer diameter of 0.6 μm, and an inner diameter of 0.2 μm. The thickness was 4 μm and the hollow ratio was 30%.

[Preparation Example 2] (Production of aqueous dispersion of hollow particles (b) having shells not chemically cross-linked)
According to the method described in Comparative Production Example 2 (Production of non-crosslinked hollow polymer particles) of Japanese Patent No. 5098173, the aqueous solution of hollow particles (b) similar to the aqueous dispersion (iii "-1) of hollow polymer particles A dispersion was obtained, the hollow particles (b) having a chemically uncrosslinked shell, the hollow particles (b) being spherical with a single pore and having an outer diameter of 1 0.1 μm, the inner diameter was 0.9 μm, the hollowness was 55%, and the solid content concentration in the aqueous dispersion of the hollow particles (b) was 26.5% by mass.

[Preparation Example 3] (Production of aqueous dispersion of hollow particles (c) having chemically crosslinked shells)
According to the method described in Example 2 of Japanese Patent No. 4281531, an aqueous dispersion of hollow particles (c) similar to the polymer particles of Example 2 was obtained. The hollow particle (c) has a chemically crosslinked shell. When the aqueous dispersion was dried and observed with a transmission electron microscope, the hollow particles (a) were completely spherical hollow organic particles having a transparent central portion, an outer diameter of 0.40 μm, and an inner diameter of 0.8. It was 30 μm and the hollowness was 42%.

[Preparation Example 4] (Production of aqueous dispersion of hollow particles (d) having chemically crosslinked shells)
An aqueous dispersion of hollow particles (d) similar to the aqueous dispersion (iii-1) was obtained according to the method described in Production Example 1 (Production of crosslinked hollow polymer particle aqueous dispersion iii) of Japanese Patent No. 5098173. . The hollow particle (d) is a sphere having a single pore, has an outer diameter of 1.1 μm, an inner diameter of 0.9 μm, a hollowness of 55%, and is solid in the aqueous dispersion of the hollow particle (b). The partial concentration was 26.5% by mass.

[Preparation Example 5] (Production of aqueous dispersion of hollow particles (e) having chemically crosslinked shells)
An aqueous dispersion of hollow particles (e) similar to the aqueous dispersion (iii′-1) of Comparative Production Example 1 (production of crosslinked hollow polymer particle aqueous dispersion iii ′) of Japanese Patent No. 5098173 was obtained. The hollow particles (e) are spherical with a single pore, have an outer diameter of 0.35 μm, an inner diameter of 0.2 μm, a hollowness of 19%, and are solid in the aqueous dispersion of the hollow particles (e). The partial concentration was 20.5% by mass.

[Preparation Example 6] (Production of aqueous dispersion of chemically crosslinked particles (f) having no pores)
According to the method described in Example 5 of Japanese Patent No. 3275397, an aqueous dispersion of particles (f) similar to the polymer particles of Example 5 was obtained. When the aqueous dispersion was dried and observed with a scanning electron microscope, it was confirmed to be spherical particles having an average particle size of 1.3 μm and high monodispersibility.

[Preparation Example 7] (Production of aqueous dispersion of silica particles (g))
Silica particles (Admatechs' “Admafine SO-C2” (average particle size 0.5 μm) 20 parts by mass and 80 parts by mass of water are mixed and subjected to a dispersion treatment for 10 minutes with an ultrasonic disperser. An aqueous dispersion of particles (g) was obtained, and the solid content concentration of the aqueous dispersion of silica particles (g) was 20% by mass.

<Preparation of composition for forming cured film>
[A] component, [B] compound, [D] emulsifier, [E] initiator, and [F] wetting agent used for preparation of the composition for forming a cured film are shown below.

[[A] component]
a: Aqueous dispersion of hollow particles (a) produced in Preparation Example 1 b: Aqueous dispersion of hollow particles (b) produced in Preparation Example 2 c: Aqueous dispersion of hollow particles (c) produced in Preparation Example 3 Body d: Aqueous dispersion of hollow particles (d) produced in Preparation Example 4 e: Aqueous dispersion of hollow particles (e) produced in Preparation Example 5 f: Aqueous dispersion of particles (f) produced in Preparation Example 6 Body g: Aqueous dispersion of silica particles (g) produced in Preparation Example 7

[[B] Compound]
B-1: Dipentaerythritol polyacrylate (“A-9550” from Shin-Nakamura Chemical Co., Ltd.)
B-2: 2: 1 adduct of dipentaerythritol pentaacrylate and hexamethylene diisocyanate (“KAYARAD DPHA-40H” from Nippon Kayaku Co., Ltd.)
B-3: Ethoxylated bisphenol A diacrylate (“A-BPE-4” from Shin-Nakamura Chemical Co., Ltd.)

[[D] emulsifier]
D-1: Polyoxyethylene polycyclic phenyl ether (Nippon Emulsifier “New Coal 707SF”, active ingredient concentration 30% by mass)

[[E] initiator]
E-1: 1-hydroxycyclohexyl phenyl ketone ("Irgacure 184" from BASF)

[[F] wetting agent]
F-1: Fluorosurfactant (Kyoeisha Chemical Co., Ltd. “Fuategent 215M”)

[Example 1]
[B] 81.0 parts by mass of (B-1) as a compound and 3.0 parts by mass of (E-1) as an [E] initiator were mixed to obtain a uniform solution. By adding 4.0 parts by mass of (D-1) as an emulsifier [D] and 100 parts by mass of water as a dispersion medium [D] to this solution, and dispersing and mixing the mixture using an ultrasonic disperser. An aqueous dispersion of [B] compound was prepared. Furthermore, 15.0 parts by mass (in terms of solid content) of hollow particles (a) as [A] particles and 0.3 parts by mass of (F-1) as [F] wetting agent are added here, and water is added. It added so that solid content concentration might be 40 mass%, and the composition (J-1) for cured film formation was prepared by stirring well.

[Examples 2 to 12 and Comparative Examples 2 and 3]
Except having changed into the composition shown in following Table 1, it carried out similarly to Example 1, and carried out the composition for cured film formation (J-2)-(J-12), (CJ-2), and (CJ-3). Prepared.

[Comparative Example 1]
The aqueous dispersion of the hollow particles (a) was dried using a spray dryer (“Pilot Series L-12 type” from Okawara Chemical Industries Co., Ltd.), and 50.0 parts by mass of the obtained hollow particles, [B] compound (B-1) 50.0 parts by mass, [E] 3.0 parts by mass of (E-1) initiator, and cyclohexanone as a dispersion medium so that the solid content concentration is 35% by mass. In addition, a dispersion treatment was performed using an ultrasonic disperser to prepare a cured film forming composition (CJ-1). The hollow particles (a ′) in Table 1 indicate that the hollow particles (a) are a dispersion in a dispersion medium containing cyclohexanone as a main component.

[Comparative Example 4]
81.0 parts by mass of polyacrylic acid (Wako Pure Chemical Industries, average molecular weight of about 25,000), which is a water-soluble polymer as a compound having no crosslinkable group, and [D] water 160. 0 parts by mass was mixed to obtain a uniform solution. Here, 15.0 parts by mass (in terms of solid content) of the aqueous dispersion of hollow particles (a) and water are added so that the solid content concentration is 20% by mass, and the mixture is thoroughly stirred to form a cured film forming composition. A product (CJ-4) was prepared.

<Production of light diffusion laminate>
[Examples 1 to 12 and Comparative Examples 2 and 3]
The composition for forming a cured film shown in Table 1 below was coated on a polyethylene terephthalate substrate (“Cosmo Shine A4300” manufactured by Toyobo Co., Ltd., average thickness 50 μm) using a bar coater and dried at 80 ° C. for 10 minutes. Curing was performed using a high-pressure mercury lamp (300 mJ / cm ² ) to produce a light diffusion laminate in which a cured film having an average thickness shown in Table 1 was laminated.

[Comparative Example 1]
A light diffusion laminate of Comparative Example 1 was produced in the same manner as in Examples 1 to 12 except that the cured film forming composition (CJ-1) was used and the average thickness of the cured film was 30 μm.

[Comparative Example 4]
Comparative Example 4 was used in the same manner as in Examples 1 to 12 except that the cured film forming composition (CJ-4) was used, the average thickness of the cured film was 6 μm, and curing was not performed using a high-pressure mercury lamp. A light diffusion laminate was produced.

<Evaluation>
About the produced said light-diffusion laminated body, the following item was evaluated by the following method. The evaluation results are shown in Table 1.

[Particle concentration in cured film]
The particle concentration (% by mass) in the cured film is a value calculated as a mass ratio with respect to the total solid content of [A] particles in the composition for forming a cured film used for forming the cured film.

[Average thickness of cured film]
Using a micrometer, the thickness of the base material and the light diffusion laminate was measured 10 times at different locations for each sample, the difference between the respective average values was determined, and the average thickness (μm) of the cured film was calculated.

[Haze value]
About the produced light-diffusion laminated body, it measured according to ASTM D1003 (unit:%) using the color haze meter (Suga Test Instruments company).

[Haze value after overcoat]
A composition excluding the [A] particle component corresponding to the cured film forming compositions of the above Examples and Comparative Examples was separately prepared. This was overcoated so as to have an average thickness of 10 μm on the corresponding light diffusion laminates of Examples and Comparative Examples, and dried and cured to produce a light diffusion laminate. The haze value of the light diffusion laminate after this overcoat was measured and used as the haze value after the overcoat (unit:%).

[Indentation modulus]
The indentation elastic modulus of the cured film formed using the composition for forming a cured film shown in Table 1 below was measured using a micro hardness tester (“Picodenter HM500” manufactured by Fisher) (unit: GPa). The indentation depth was 5% of the average thickness of the cured film. The indentation elastic modulus is an index of the hardness (strength) of the cured film.

  As can be seen from the results in Table 1, the cured films formed from the cured film forming compositions of the examples can exhibit high light diffusion characteristics even when they are thin, while maintaining excellent strength, and an overcoat Even in this case, the deterioration of the light diffusion characteristics is small, and high light diffusion characteristics can be maintained.

According to the composition for forming a cured film of the present invention, it is possible to form a cured film that can exhibit high light diffusion characteristics even when it is thin and has a small decrease in light diffusion characteristics due to the overcoat layer. According to the method for producing a cured film forming composition of the present invention, such a cured film forming composition can be produced easily and reliably. The cured film and the light diffusion laminate of the present invention can exhibit high light diffusion characteristics even when they are thin, and the deterioration of the light diffusion characteristics due to the overcoat layer is small. According to the display device of the present invention, image blur can be reduced. According to the display device manufacturing method of the present invention, such a display device can be manufactured easily and reliably.

Claims (12)

Hollow organic particles,
A compound having a crosslinkable group;
A composition for forming a cured film, comprising a dispersion medium containing water as a main component.   The composition for forming a cured film according to claim 1, further comprising an emulsifier.   The composition for forming a cured film according to claim 1 or 2, further comprising an initiator.   The composition for forming a cured film according to claim 1, wherein the compound having a crosslinkable group contains a bifunctional or higher functional (meth) acrylate compound.   5. The composition for forming a cured film according to claim 1, wherein the hollow organic particles have an inner diameter of 0.05 μm or more and 4 μm or less.   The composition for forming a cured film according to any one of claims 1 to 5, wherein the content of the hollow organic particles is 0.5% by mass or more and 60% by mass or less in terms of solid content. A method for producing a composition for forming a cured film, comprising: mixing hollow organic particles, a compound having a crosslinkable group, and a dispersion medium containing water as a main component.   The cured film formed from the composition for cured film formation of any one of Claims 1-6. A substrate;
A light diffusion layer laminated on at least one surface of the substrate,
The light-diffusion laminated body in which the said light-diffusion layer is formed with the cured film of Claim 8.   The light diffusion laminate according to claim 9, which is used as a front diffuser of a reflective liquid crystal display device or a light diffusion film of a transmissive liquid crystal display device.   A display apparatus provided with the light-diffusion laminated body of Claim 9 or Claim 10. A method for manufacturing a display device comprising a display unit and a light diffusion laminate,
Applying a composition for forming a cured film containing hollow organic particles, a compound having a crosslinkable group, and a dispersion medium containing water as a main component on at least one surface side of the substrate;
And a step of disposing the light diffusion laminate obtained by the coating step on the display side of the display unit or on the opposite side thereof.