阅读说明：本技术 滤蓝光膜用紫外线硬化型树脂组合物及使用此组合物的滤蓝光膜 (Ultraviolet-curable resin composition for blue light-filtering film and blue light-filtering film using same ) 是由 浅见一司 远藤元气 于 2018-05-09 设计创作，主要内容包括：本发明的滤蓝光膜用紫外线硬化型树脂组合物含有：具有聚合性官能团的至少1种聚合性液晶化合物、及在分子中具有(甲基)丙烯酰基且分子量为200以上的至少1种(甲基)丙烯酸酯。另外,本发明的滤蓝光膜具备：支撑体、及在该支撑体上使所述紫外线硬化型树脂组合物硬化所成的硬化膜。(The ultraviolet ray hardening type resin composition for filtering blue light film of the invention comprises: at least 1 polymerizable liquid crystal compound having a polymerizable functional group, and at least 1 (meth) acrylate having a (meth) acryloyl group in a molecule and having a molecular weight of 200 or more. In addition, the blue light filtering film of the present invention comprises: and a cured film obtained by curing the ultraviolet curable resin composition on the support.)

1. An ultraviolet-curable resin composition for a blue-light-filtering film, comprising: at least 1 polymerizable liquid crystal compound having a polymerizable functional group, and at least 1 (meth) acrylate having a (meth) acryloyl group in a molecule and having a molecular weight of 200 or more.

2. The ultraviolet curable resin composition according to claim 1 wherein said at least 1 polymerizable liquid crystal compound comprises a polymerizable rod-like liquid crystal compound.

3. The ultraviolet ray hardening type resin composition according to claim 2, further comprising a chiral agent.

4. The ultraviolet curable resin composition according to any one of claims 1 to 3, wherein the content of the (meth) acrylate is 0.1 to 10 parts by mass with respect to 100 parts by mass of the polymerizable liquid crystal compound.

5. The ultraviolet ray hardening type resin composition according to any one of claims 1 to 4, further comprising a polymerization initiator.

6. A blue light filtering film is provided with: a support and a cured film obtained by curing an ultraviolet curable resin composition on the support;

The ultraviolet curable resin composition contains: at least 1 polymerizable liquid crystal compound having a polymerizable functional group, and at least 1 (meth) acrylate having a (meth) acryloyl group in a molecule and having a molecular weight of 200 or more.

7. A blue filter film according to claim 6, wherein the blocking ratio of blue light at 450nm is 29 to 31%.

8. The blue-filter film according to claim 6 or 7, wherein the at least 1 polymerizable liquid crystal compound comprises a polymerizable rod-like liquid crystal compound.

9. The blue-filter film according to any one of claims 6 to 8, wherein the ultraviolet-curable resin composition further contains a chiral agent.

10. The blue-filter film according to any one of claims 6 to 9, wherein the content of the (meth) acrylate is 0.1 to 10 parts by mass with respect to 100 parts by mass of the polymerizable liquid crystal compound.

Technical Field

The present invention relates to an ultraviolet curable resin composition for a blue light filtering film and a blue light filtering film using the same, and more particularly, to an ultraviolet curable resin composition for a blue light filtering film which has a function of sufficiently blocking a wavelength of around 450nm and can impart a function of suppressing a yellow hue and haze of transmitted light, and a blue light filtering film using the same.

Background

Blue light emitted from a display device or the like is pointed out to cause a large burden on eyes and a body. The blue light refers to blue light in the wavelength range of 380 to 495nm, and has a strong energy among visible light. Therefore, when blue light reaches the retina without being absorbed by the cornea and the crystalline lens, there is a fear of damaging the retina, and it also becomes a cause of eye fatigue, sleep influence, and the like.

In recent years, display devices having Light Emitting Diodes (LEDs) with a large amount of blue light generation tend to be used as light sources for display devices used in personal computers, smart phones, desktop terminals, and the like. Therefore, the exposure amount of blue light, particularly blue light having a wavelength around 450nm, is larger than ever, and there is a risk that the burden on eyes, body, and the like by blue light is increased.

As a method of suppressing the exposure of blue light, a technique using a blue light filter film disposed on the display surface of an image display device is known. However, the current blue light filtering film has insufficient blue light filtering function and has problems such as yellowish transmitted light, and further improvement of the characteristics of the blue light filtering film is required.

In view of such a demand, patent document 1 discloses a blue filter film in which a yellow hue is suppressed by a combination of a color-imparting material and light-diffusing particles.

Patent document 2 discloses that a liquid crystal compound having a polymerizable functional group and a compound having a naphthalimide (naphthalimide) skeleton are used in combination to improve a blue light filtering function.

[ Prior art documents ]

[ patent document ]

[ patent document 1] Japanese patent laid-open publication No. 2015-194553

[ patent document 2] International publication No. 2015/093093.

Disclosure of Invention

[ problems to be solved by the invention ]

The blue light-filtering film is generally applied to an optical member, and thus is required to exhibit high transparency as much as possible. An index indicating such transparency is known as haze, and the lower the numerical value, the higher the transparency. However, the blue filter film described in patent document 1 includes light diffusing particles, and thus the haze thereof is significantly high. In addition, in patent document 2, no specific evaluation is made as to haze.

In view of the above problems, an object of the present invention is to provide an ultraviolet curable resin composition for a blue light filtering film having a sufficient blue light filtering function, particularly a function of blocking a wavelength around 450nm, and capable of providing a function of suppressing a yellow hue and haze of transmitted light, and a blue light filtering film using the same.

[ means for solving problems ]

The present inventors have found that by using an ultraviolet-curable resin composition containing "at least 1 polymerizable liquid crystal compound having a polymerizable functional group" and "a (meth) acrylate having a (meth) acryloyl group in the molecule and having a molecular weight of 200 or more", respectively, as a resin composition for a blue light filter film, it is possible to obtain an ultraviolet-curable resin composition for a blue light filter film having a function of sufficiently blocking blue light in the vicinity of 450nm and a function of suppressing the yellow hue and haze of transmitted light, and a blue light filter film using the same.

That is, the present invention is generally configured as follows.

[1] An ultraviolet-curable resin composition for a blue-light-filtering film, comprising: at least 1 polymerizable liquid crystal compound having a polymerizable functional group, and at least 1 (meth) acrylate having a (meth) acryloyl group in a molecule and having a molecular weight of 200 or more.

[2] The ultraviolet ray curable resin composition according to [1], wherein the at least 1 polymerizable liquid crystal compound comprises a polymerizable rod-like liquid crystal compound.

[3] The ultraviolet ray curable resin composition according to item [2], further comprising a chiral (chiral) agent.

[4] The ultraviolet ray curable resin composition according to any one of [1] to [3], wherein the content of the (meth) acrylate is 0.1 to 10 parts by mass with respect to 100 parts by mass of the polymerizable liquid crystal compound.

[5] The ultraviolet ray curable resin composition according to any one of [1] to [4], further comprising a polymerization initiator.

[6] A blue light filtering film is provided with: a support and a cured film obtained by curing an ultraviolet curable resin composition on the support; wherein the ultraviolet curable resin composition comprises: at least 1 polymerizable liquid crystal compound having a polymerizable functional group, and at least 1 (meth) acrylate having a (meth) acryloyl group in a molecule and having a molecular weight of 200 or more.

[7] The blue-filtering film according to item [6], wherein the blocking ratio of blue light at 450nm is 29 to 31%.

[8] The blue-filter film according to [6] or [7], wherein the at least 1 polymerizable liquid crystal compound contains a polymerizable rod-like liquid crystal compound.

[9] The blue-filter film according to any one of [6] to [8], wherein the ultraviolet-curable resin composition further contains a chiral agent.

[10] The blue-filter film according to any one of [6] to [9], wherein the content of the (meth) acrylate is 0.1 to 10 parts by mass with respect to 100 parts by mass of the polymerizable liquid crystal compound.

[ Effect of the invention ]

The present invention can provide an ultraviolet curable resin composition for a blue light filtering film which has a sufficient blue light filtering function, particularly a function of blocking a wavelength around 450nm, and can provide a function of suppressing a yellow hue and a haze of transmitted light, and a blue light filtering film using the same.

Drawings

Fig. 1 is a graph showing the transmittance of blue-filter films produced in examples 1 to 5.

Fig. 2 is a graph showing the transmittance of the blue filter films produced in comparative examples 1 to 8.

Detailed Description

< UV-curable resin composition for blue Filter film >

The ultraviolet curable resin composition for a blue filter film (hereinafter, also simply referred to as "ultraviolet curable resin composition") of the present invention can be used for forming a cured film provided in the blue filter film of the present invention. Such an ultraviolet curable resin composition contains: at least 1 polymerizable liquid crystal compound having a polymerizable functional group, and at least 1 (meth) acrylate having a (meth) acryloyl group in a molecule and having a molecular weight of 200 or more.

(1) Polymerizable liquid crystal compound having polymerizable functional group

The ultraviolet curable resin composition preferably contains a polymerizable rod-like liquid crystal compound as the polymerizable liquid crystal compound having a polymerizable functional group. The ultraviolet curable resin composition may further contain an optionally selected chiral agent.

(a) Polymerizable rod-like liquid crystal compound

The polymerizable rod-like liquid crystal compound is, for example, a polymerizable rod-like nematic liquid crystal compound. Examples of the polymerizable rod-like nematic liquid crystal compound include: methine azo compounds, azoxy compounds, cyanobiphenyl compounds, cyanophenyl esters, benzoic acid esters, cyclohexanecarboxylic acid phenyl esters, cyanophenylcyclohexanes, cyano-substituted phenylpyrimidines, phenyldioxanes, tolans and alkenylcyclohexylbenzonitrile. The polymerizable rod-like liquid crystal compound may be either a low-molecular liquid crystal compound or a high-molecular liquid crystal compound, or may be a mixture of a low-molecular liquid crystal compound and a high-molecular liquid crystal compound. The polymerizable rod-like liquid crystal compound may be used alone in 1 kind or in combination of two or more kinds.

The polymerizable rod-like liquid crystal compound is obtained by introducing a polymerizable group into a rod-like liquid crystal compound. Examples of the polymerizable group include an unsaturated polymerizable group, an epoxy group and an aziridine group, and an unsaturated polymerizable group is more preferable, and an ethylenically unsaturated polymerizable group is particularly preferable. The polymerizable group can be introduced into the molecule of the rod-like liquid crystal compound by various methods. The number of the polymerizable groups of the polymerizable rod-like liquid crystal compound is preferably 1 to 6, and more preferably 1 to 3. Examples of the polymerizable rod-like liquid crystal compound include: makromol. chem., 190, 2255 (1989), advanced materials 5, 107 (1993), 4683327, 5622648, 5770107, 95/22586, 95/24455, 97/00600, WO98/23580, 98/52905, 1-272551, 6-16616, 7-110469, 11-80081 and 2001-328973. The polymerizable rod-like liquid crystal compound may be used alone in 1 kind, or 2 or more kinds may be used in combination. By using 2 or more polymerizable rod-like liquid crystal compounds in combination, the alignment temperature can be lowered. Further, the polymerizable liquid crystal compound may be used in combination with a polymerizable rod-like liquid crystal compound and a non-polymerizable rod-like compound. The non-polymerizable rod-like compound, that is, the rod-like liquid crystal compound having no polymerizable group is not particularly limited, and for example, non-polymerizable rod-like compounds described in y.goto et al, mol.crystal.liq.crystal.1995, vol.260, pp.23-28, and the like can be used.

(b) Chiral agent (polymerizable optically active Compound)

Since the polymerizable rod-like liquid crystal compound is a liquid crystal compound exhibiting a cholesteric liquid crystal phase, the ultraviolet-curable resin composition preferably contains a chiral agent (polymerizable optically active compound) in addition to the polymerizable rod-like liquid crystal compound. However, when the polymerizable rod-like liquid crystal compound is a molecule having an asymmetric carbon atom, a cholesteric liquid crystal phase may be stably formed without adding a chiral agent. The polymerizable optically active compound can be selected from known various polymerizable chiral agents (for example, chiral agents for liquid crystal device handbook, chapter 3, items 4-3, TN, STN, page 199, Japanese society for academic society, 142 Council, 1989). Chiral agents generally contain asymmetric carbon atoms, but axial or planar asymmetric compounds that do not contain asymmetric carbon atoms may also be used as chiral agents. Examples of the axial asymmetric compound or the planar asymmetric compound include compounds selected from the group consisting of binaphthyl, helical hydrocarbon (helicene), para-cyclic aromatic hydrocarbon (paracyclophane), and derivatives thereof. By the polymerization reaction of the chiral agent and the polymerizable rod-like liquid crystal compound, a polymer having a repeating unit derived from the rod-like liquid crystal compound and a repeating unit derived from the polymerizable optically active compound can be formed. The polymerizable group of the chiral agent is preferably the same as the polymerizable group of the polymerizable rod-like liquid crystal compound. Therefore, the polymerizable group of the chiral agent is preferably an unsaturated polymerizable group, an epoxy group or an aziridine group, more preferably an unsaturated polymerizable group, and still more preferably an ethylenically unsaturated polymerizable group. In addition, the chiral agent may be a polymerizable liquid crystal compound. For example, as the chiral agent, among the polymerizable rod-like liquid crystal compounds described in the above (a), a different kind of polymerizable liquid crystal compound from the polymerizable rod-like liquid crystal compound used as the main component of the ultraviolet curable resin composition can be used. Such chiral agents may be used alone in 1 kind, or in combination of plural kinds.

The content of the chiral agent is preferably 0.1 to 30 mol based on 100 mol of the polymerizable rod-like liquid crystal compound used in combination. The smaller the content of the chiral agent, the more the influence of the polymerizable rod-like liquid crystal compound on the liquid crystallinity can be suppressed, and the smaller the content of the chiral agent is, the preferable. Therefore, a polymerizable optically active compound as a chiral agent can be used, and a compound having a strong twisting power is more preferable because a desired twist orientation of the helical pitch can be achieved even with a small amount. Examples of such a chiral agent exhibiting a strong twisting power include those described in Japanese patent laid-open publication No. 2003-287623.

(2) (meth) acrylate having (meth) acryloyl group

The molecular weight of the (meth) acrylate having a (meth) acryloyl group in the molecule is 200 or more, and 230 to 2500 is more preferable. By using a (meth) acrylate having a (meth) acryloyl group with a molecular weight of 200 or more, the yellow hue of the blue filter film can be suppressed.

Examples of the (meth) acrylate having a (meth) acryloyl group include: trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, a reaction product of pentaerythritol tri (meth) acrylate and 1, 6-hexamethylene diisocyanate, a reaction product of pentaerythritol tri (meth) acrylate and isophorone diisocyanate, tris (acryloyloxyethyl) isocyanurate, tris (methacryloyloxyethyl) isocyanurate, a reaction product of glycerol triglycidyl ether and (meth) acrylic acid, caprolactone-modified tris (acryloyloxyethyl) isocyanurate, caprolactone-modified tris (methacryloyloxyethyl) isocyanurate, pentaerythritol tetra (meth) acrylate, and 1, 6-hexamethylene diisocyanate, A reaction product of trimethylolpropane triglycidyl ether and (meth) acrylic acid, triglycerol di (meth) acrylate, a reaction product of propylene glycol diglycidyl ether and (meth) acrylic acid, polypropylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, pentaerythritol di (meth) acrylate, a reaction product of 1, 6-hexanediol diglycidyl ether and (meth) acrylic acid, 1, 6-hexanediol di (meth) acrylate, glycerol di (meth) acrylate, a reaction product of ethylene glycol diglycidyl ether and (meth) acrylic acid, a reaction product of diethylene glycol diglycidyl ether and (meth) acrylic acid, a reaction product of propylene glycol diglycidyl ether and (meth) acrylic acid, and mixtures thereof, Bis (acryloyloxyethyl) hydroxyethyl isocyanurate, bis (methacryloyloxyethyl) hydroxyethyl isocyanurate, reaction product of bisphenol A diglycidyl ether and (meth) acrylic acid, tetrahydrofurfuryl methyl (meth) acrylate, caprolactone-modified tetrahydrofurfuryl methyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, polypropylene glycol (meth) acrylate, polyethylene glycol (meth) acrylate, phenoxyhydroxypropyl (meth) acrylate, (meth) acryloylmorpholine, methoxypolyethylene glycol (meth) acrylate, methoxypentaethylene glycol (meth) acrylate, methoxytriethylene glycol (meth) acrylate, methoxyethyl (meth) acrylate, bisphenol A diglycidyl ether, and (meth) acrylic acid, Glycidyl (meth) acrylate, glycerol (meth) acrylate, ethyl carbitol (meth) acrylate, 2-ethoxyethyl (meth) acrylate, N-dimethylaminoethyl (meth) acrylate, 2-cyanoethyl (meth) acrylate, a reaction product of butyl glycidyl ether and (meth) acrylic acid, butoxytriethylene glycol (meth) acrylate, butanediol mono (meth) acrylate, and the like. These may be used alone in 1 kind, or in combination of plural kinds.

The content of the (meth) acrylate in the ultraviolet curable resin composition is not particularly limited, but is preferably 0.1 to 10 parts by mass, more preferably 2 to 6 parts by mass, based on 100 parts by mass of the polymerizable liquid crystal compound having a polymerizable group. By setting the content of the (meth) acrylic acid ester to a range of 0.1 to 10 parts by mass, the haze and the yellow tone of the blue filter film can be suppressed to be low at the same time.

(3) Polymerization initiator

The ultraviolet curable resin composition may further contain a polymerization initiator. The polymerization initiator is preferably a photopolymerization initiator capable of initiating a polymerization reaction by irradiation with ultraviolet rays. Such photopolymerization initiator is not particularly limited, and examples thereof include: 2-methyl-1- [4- (methylthio) phenyl ] -2-morpholinopropan-1-one (IRGACURE-907, Ciba Specialty Chemicals), 1-hydroxycyclohexyl phenyl ketone (IRGACURE-184, Ciba Specialty Chemicals), 4- (2-hydroxyethoxy) -phenyl (2-hydroxy-2-propyl) ketone (IRGACURE-2959, Ciba Specialty Chemicals), 1- (4-dodecylphenyl) -2-hydroxy-2-methylpropan-1-one (DAROCUR 953, MERCK), 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one (DAROCUR 1116, MERCK), 2-hydroxy-2-methyl-1-phenylpropan-1-one- Acetophenone compounds such as ketones (IRGACURE-1173 manufactured by Ciba Specialty Chemicals) and diethoxyacetophenones; benzoin compounds such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, and 2, 2-dimethoxy-2-phenylacetophenone (IRGACURE-651, manufactured by Ciba Specialty Chemicals Co., Ltd.); benzophenone compounds such as benzoylbenzoic acid, methyl benzoylbenzoate, 4-phenylbenzophenone, hydroxybenzophenone, 4-benzoyl-4 '-methyldiphenylsulfide, and 3, 3' -dimethyl-4-methoxybenzophenone (KAYACURE-MBP, manufactured by NIPPON CHEMICAL CO., LTD.), and the like; thioxanthone compounds such as 2-chlorothioxanthone (KAYACURE-CTX, manufactured by NIPPON CHEMICAL CO., LTD.), 2-methylthioxanthone, 2, 4-dimethylthioxanthone (KAYACURE-RTX, manufactured by NIPPON CHEMICAL CO., LTD.), isopropylthioxanthone, 2, 4-dichlorothioxanthone (KAYACURE-CTX, manufactured by NIPPON CHEMICAL CO., LTD.), 2, 4-diethylthioxanthone (KAYACURE-DETX, manufactured by NIPPON CHEMICAL CO., LTD.), and 2, 4-diisopropylthioxanthone (KAYACURE-DITX, manufactured by NIPPON CHEMICAL CO., LTD.). These photopolymerization initiators may be used alone or in combination of 2 or more.

The content of the photopolymerization initiator in the ultraviolet curable resin composition is not particularly limited, but is preferably 0.5 parts by mass in terms of the lower limit, 10 parts by mass or less in terms of the upper limit, 2 parts by mass in terms of the lower limit, and 8 parts by mass in terms of the upper limit, per 100 parts by mass of the polymerizable liquid crystal compound having a polymerizable functional group.

(4) Reaction auxiliary agent

When a benzophenone compound or a thioxanthone compound is used as the photopolymerization initiator, a reaction auxiliary is preferably used in combination in order to accelerate the photopolymerization reaction. The reaction assistant is not particularly limited, and examples thereof include amine compounds such as triethanolamine, methyldiethanolamine, triisopropanolamine, N-butylamine, N-methyldiethanolamine, diethylaminoethyl methacrylate, Michler's ketone, 4' -diethylaminoketone, ethyl 4-dimethylaminobenzoate (N-butoxy) and isoamyl 4-dimethylaminobenzoate. These reaction assistants may be used alone or in combination of 2 or more.

The content of the reaction auxiliary in the ultraviolet curable resin composition is not particularly limited, but is preferably used within a range that does not affect the liquid crystallinity of the polymerizable liquid crystalline compound. Specifically, the lower limit is preferably 0.5 parts by mass, the upper limit is preferably 10 parts by mass or less, the lower limit is more preferably 2 parts by mass, and the upper limit is more preferably 8 parts by mass, based on 100 parts by mass of the polymerizable liquid crystal compound having a polymerizable functional group. In addition, the content of the reaction auxiliary is preferably 0.5 to 2 times by mass relative to the content of the photopolymerization initiator.

(5) Other additives

The ultraviolet curable resin composition may further contain various additives such as a leveling agent, an antifoaming agent, an ultraviolet absorber, a light stabilizer, an antioxidant, a polymerization inhibitor, a crosslinking agent, a plasticizer, inorganic fine particles, a dye, a pigment, and a fluorescent pigment filler, if necessary. By using such additives, desired functions can be further provided to the ultraviolet curable resin composition.

Examples of the leveling agent include fluorine compounds, silicone compounds, and acrylic compounds.

Examples of the ultraviolet absorber include benzotriazole compounds, benzophenone compounds, and triazine compounds. Examples of the light stabilizer include amine-blocking compounds and benzoate compounds. Examples of the antioxidant include phenolic compounds.

Examples of the polymerization inhibitor include p-methoxyphenol (methoquinone), methylhydroquinone, and hydroquinone. The crosslinking agent includes the aforementioned polyisocyanate and melamine compound.

Examples of the plasticizer include phthalic acid esters such as dimethyl phthalate and ethylene phthalate; trimellitates such as tris (2-ethylhexyl) trimellitate; aliphatic dibasic acid esters such as dimethyl adipate and dibutyl adipate; orthophosphoric acid esters such as tributyl phosphate and triphenyl phosphate; and acetates such as triacetin and 2-ethylhexyl acetate.

The inorganic fine particles, dye, pigment, fluorescent dye and filler are not particularly limited, and may be used as needed within a range not affecting the present invention.

(6) Solvent(s)

The ultraviolet curable resin composition may contain a solvent for adjusting the viscosity of the coating liquid and improving the coatability. Examples of such solvents are: acetates such as ethyl acetate, butyl acetate and methyl acetate; alcohols such as methanol, ethanol, propanol, isopropanol and benzyl alcohol; ketones such as 2-butanone, acetone, cyclopentanone, and cyclohexanone; base system media such as benzylamine, triethylamine and pyridine; and nonpolar media such as cyclohexane, benzene, toluene, xylene, anisyl ether, hexane, and heptane. The solvent may be added to the ultraviolet curable resin composition at an arbitrary ratio, and only 1 kind of the solvent may be added, or a plurality of kinds of the solvents may be blended. The solvent can be dried and removed in a drying area of an oven, a film coater production line and the like.

< blue light filtering film >

The blue light filtering film of the invention comprises: a support and a cured film, wherein the cured film is formed by curing the ultraviolet curable resin composition on the support. That is, the blue light filtering film of the present invention has: a support and a cured film obtained by curing an ultraviolet curable resin composition on the support, the ultraviolet curable resin composition comprising: at least 1 polymerizable liquid crystal compound having a polymerizable functional group, and at least 1 (meth) acrylate having a (meth) acryloyl group in a molecule and having a molecular weight of 200 or more. Here, the ultraviolet curable resin composition used for producing the cured film similarly has the components (1) to (6) described above as components contained in the ultraviolet curable resin composition for a blue light filtering film. Such a blue light-filtering film can be obtained by coating the ultraviolet-curable resin composition on a support and curing the composition. As described above, the blue light-filtering film of the present invention is formed using the ultraviolet-curable resin composition, and therefore, it is possible to provide a blue light-filtering film having a sufficient blue light-filtering function, particularly a function of blocking a wavelength near 450nm, while suppressing the yellow hue and haze of transmitted light. The more preferable the blue light filtering function is in terms of the higher its blocking rate. For example, the blocking ratio of blue light at 450nm is preferably 29% to 31%, more preferably 30% or more. The lower the b value of the transmitted light is, the more preferable the transmitted light is, and when the b value is 1.5 or less, the transmitted light is hardly noticeable in the yellow tone. The lower the haze value of the transmitted light is, the more preferable, and when the haze value is 1.5 or less, the transparency is high, and the application to an optical member in which transparency is important is advantageous.

The support material used for manufacturing the blue light filtering film is not particularly limited, but examples thereof include: polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and polycyclohexanedimethyl terephthalate; polyolefins such as polyethylene, polypropylene, and polyethylene-vinyl acetate copolymer; films such as polyvinyl chloride, polyvinylidene chloride, polycarbonate, polyamide, polyimide, polyamideimide, polyetherimide, polyether sulfide, polyether sulfone, polyether ketone, polyphenylene ether, polyphenylene sulfide, polyarylate, polysulfone, polyacrylate, cellulose derivative, cycloolefin polymer, and liquid crystal polymer.

Among these, from the viewpoint of balance between flexibility and toughness and general applicability, a film in which the support material is a material selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polypropylene, polyethylene-vinyl acetate copolymer, polycarbonate, polyamide, polyimide, polyamideimide, polyphenylene ether, polyphenylene sulfide, polyarylate and polysulfone is more preferable.

The thickness of the support member is not particularly limited, and may be appropriately determined from the viewpoint of the easiness of obtaining a support having a desired thickness and the handling in use or conveyance. For example, from the viewpoint of stable conveyance, the thickness of the support material is preferably 5 μm to 250 μm, more preferably 12 μm to 188 μm. The support material may further be provided with a pattern, an easy-adhesion layer, and a base layer, and may be subjected to surface treatment such as corona treatment, release treatment, or the like.

The method for producing the blue filter film using the ultraviolet curable resin composition is not particularly limited, and can be suitably selected from conventionally known methods. Among them, the wet coating method is preferably used from the viewpoint of easy application to continuous production by roll-to-roll, large area of the blue filter film, and improvement of productivity. Specific examples of the wet coating method include: dip coating, air knife coating, curtain coating, roll coating, wire bar coating, gravure coating, die coating, knife coating, microgravure coating, spray coating, spin coating, and comma coating.

The blue light-filtering film of the present invention has a cured film obtained by curing a polymerizable liquid crystal compound contained in the ultraviolet curable resin composition depending on a predetermined liquid crystal regularity. The thickness of the cured film is preferably 0.1 μm to 10 μm, more preferably 0.2 μm to 6 μm.