Optical components, curable resin compositions, and electronic devices

Abstract

To provide an optical component that has excellent hardness, adhesion, and whiteness clarity, good warp and flexibility, and minimal bleeding. [Solution] An optical member comprising a light-transmitting substrate with an ultraviolet shielding layer disposed on at least one surface thereof, wherein the ultraviolet shielding layer comprises a cured product of a resin having hydroxyl groups (A) and a curing agent (B) that can react with hydroxyl groups, an ultraviolet absorber (C), and a chromaticity adjuster (D), wherein the transmittance (ta) of the ultraviolet shielding layer at a wavelength of 380 nm is 3% or less and the transmittance (tb) at a wavelength of 420 nm is 65% or more, and preferably the resin having hydroxyl groups (A) comprises an aromatic polyester resin or a cellulose ester resin.

Description

[Technical Field]

[0001] The present invention relates to optical components, curable resin compositions, and electronic devices. [Background technology]

[0002] Various types of displays used in TVs, laptops, mobile phones, smartphones, etc. (liquid crystal displays (LCDs), organic electroluminescent displays (ELs), electronic paper, etc.) have been used in a wide range of fields in recent years. These displays are increasingly being installed on walls and pillars in places like train stations and halls, and the ability to conform to curved surfaces has become a requirement. Furthermore, with the emergence of laptops, tablets, and smartphones that allow the display to be folded, the hinge portion of these displays requires flexibility to conform to bending. Thus, optical components now require not only the hardness that has been traditionally required, but also the flexibility to conform to curved surfaces.

[0003] Optical components used in these displays are generally provided with an ultraviolet shielding layer, which prevents degradation due to exposure to external light (especially ultraviolet light) and protects the eyes from ultraviolet light generated from within the display. As an example of a hard coat film equipped with an ultraviolet shielding layer, the ultraviolet-absorbing hard coat film disclosed in Patent Document 1 is known. However, the hard coat film disclosed in Patent Document 1 had the problem of lacking the flexibility and white clarity that have been required in recent years. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2009-6513 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] The problem to be solved by the present invention is to provide an optical member that is excellent in hardness, adhesion, white clarity, has good warp and flexibility, and has little bleed.

Means for Solving the Problem

[0006] The inventors of the present invention have intensively studied for the purpose of solving the above problems and have completed the present invention. That is, the present invention is an optical member in which an ultraviolet shielding layer is disposed on at least one surface of a light-transmissive substrate, and the ultraviolet shielding layer includes a cured product of a resin (A) having a hydroxyl group and a curing agent (B) capable of reacting with the hydroxyl group, an ultraviolet absorber (C), and a chromaticity adjuster (D), and the transmittance (ta) at a wavelength of 380 nm of the ultraviolet shielding layer is 3% or less, and the transmittance (tb) at a wavelength of 420 nm is 65% or more. It relates to an optical member.

[0007] The present invention also relates to the above optical member, wherein the resin (A) having a hydroxyl group includes an aromatic polyester resin or a cellulose ester resin.

[0008] Also, the present invention is L * a * b * In the colorimetric system, b * is -1.5 or more and 1.2 or less. It relates to the above optical member.

[0009] Also, the present invention is L * a * b * In the colorimetric system, a * is - more than 2 and 1.5 or less. It relates to the above optical member.

[0010] The present invention also relates to a curable resin composition for forming an ultraviolet shielding layer in an optical member in which an ultraviolet shielding layer is disposed on at least one surface of a light-transmissive substrate, the curable resin composition comprising a resin (A) having a hydroxyl group, a curing agent (B) capable of reacting with the hydroxyl group, an ultraviolet absorber (C), and a chromaticity adjuster (D).

[0011] The present invention also relates to an electronic device comprising the above optical member.

Advantages of the Invention

[0012] According to the present invention, it has become possible to provide an optical member that is excellent in hardness, adhesion, white clarity, has good warpage and flexibility, and has little bleed.

Embodiments for Carrying Out the Invention

[0013] Hereinafter, the present invention will be described in detail. Needless to say, other embodiments are also included in the scope of the present invention as long as they conform to the gist of the present invention. First, symbols, abbreviations, terms, etc. used in this specification will be explained. In this specification, a numerical range specified using "~" shall include the numerical values described before and after "~" as the range of the lower limit value and the upper limit value. "Mn" and "Mw" represent the number average molecular weight and the weight average molecular weight, respectively. "Tg" represents the glass transition temperature. "MV" represents the volume average primary particle diameter. "D50" represents the average dispersion particle diameter.

[0014] <Curable Resin Composition> The curable resin composition of the present invention contains a resin (A) having a hydroxyl group, a curing agent (B) capable of reacting with the hydroxyl group, an ultraviolet absorber (C), and a color tone adjuster (D).

[0015] <Resin (A) Having a Hydroxyl Group> Examples of resins containing hydroxyl groups (A) (hereinafter sometimes abbreviated as "resin (A)") include polyester resins, epoxy resins, phenoxy resins, polyurethane resins, polyurethane urea resins, phenolic resins containing hydroxyl groups, polycarbonate resins, benzoguanamine resins, polyester resins, aromatic polyether ketone resins containing hydroxyl groups, alkyd resins, silicone resins, polystyrene resins, styrene-(meth)acrylic resins, styrene-butadiene resins, and polyvinyl acetal resins, among which those containing hydroxyl groups are included. Also included are cellulose acetate butyrate (CAB) resins and cellulose ester resins. Examples of epoxy resins include bisphenol A (BPA) type epoxy resin and bisphenol F (BPF) type epoxy resin. Examples of polyvinyl acetal resins include polyvinyl acetal and polyvinyl butyral. Examples of cellulose ester resins include cellulose acetate butyrate (CAB) resin and cellulose acetate propylate (CAP) resin. Resin (A) may be used alone or in combination of two or more types.

[0016] The resin (A) preferably has a ring structure (e.g., an aromatic ring, an aliphatic ring, or a heterocycle). Having a ring structure improves adhesion to the substrate while also improving flexibility. The ring structure may be located in the main chain, side chains, or both of the resin (A).

[0017] From the viewpoint of excellent adhesion to a light-transmitting substrate and flexibility, the resin (A) is preferably an aromatic polyester resin, a cellulose ester resin, a phenoxy resin, or a polyvinyl acetal resin, with aromatic polyester resin or cellulose ester resin being more preferred.

[0018] <Aromatic polyester resin> Aromatic polyester resins are polyester resins having aromatic rings, and those obtained by the reaction of polybasic acids such as aromatic dicarboxylic acids with polyols such as diols are preferred. Using aromatic polyester resins is preferable because they provide good adhesion to the substrate, hardness, flexibility, and transmittance of the UV shielding layer.

[0019] Aromatic polyester resins, commercially available examples include Elitel UE-3250 (Mn 18,000, hydroxyl value 5 mg KOH / g, Tg 40℃, manufactured by Unitika), Elitel UE-3223G (Mn 20,000, hydroxyl value 5 mg KOH / g, Tg -1℃, manufactured by Unitika), Elitel UE-3201 (Mn 20,000, hydroxyl value 3 mg KOH / g, Tg 65℃, manufactured by Unitika), and Elitel UE-3600 (Mn 20,000, hydroxyl value 4 mg Elitel XA-0611 (Mn 17,000, hydroxyl value 4 mg KOH / g, Tg 65℃, manufactured by Unitika), Elitel UE-3200G (Mn 15,000, hydroxyl value 6 mg KOH / g, Tg 65℃, manufactured by Unitika), Elitel UE-3980 (Mn 8,000, hydroxyl value 17 mg KOH / g, Tg 63℃, manufactured by Unitika), Elitel XP-0544 (Mn 3,500, hydroxyl value 32 mg KOH / g) (Tg 51℃, manufactured by Unitika), Byron 300 (Mn 23,000, hydroxyl value 5 mg KOH / g, Tg 7℃, manufactured by Toyobo MC Co., Ltd.), Byron 630 (Mn 23,000, hydroxyl value 5 mg KOH / g, Tg 7℃, manufactured by Toyobo MC Co., Ltd.), Byron 220 (Mn 3,000, hydroxyl value 50 mg KOH / g, Tg 53℃, manufactured by Toyobo MC Co., Ltd.), Byron 200 (Mn 17,000, hydroxyl value 6 mg KOH / g, Tg 67℃, manufactured by Toyobo MC Co., Ltd.), Examples include Ilon 802 (Mn 3,000, hydroxyl value 37 mg KOH / g, Tg 60℃, manufactured by Toyobo MC Co., Ltd.), Byron GK810 (Mn 6,000, hydroxyl value 19 mg KOH / g, Tg 46℃, manufactured by Toyobo MC Co., Ltd.), Byron GK780 (Mn 11,000, hydroxyl value 11 mg KOH / g, Tg 36℃, manufactured by Toyobo MC Co., Ltd.), and Byron GK250 (Mn 10,000, hydroxyl value 11 mg KOH / g, Tg 60℃, manufactured by Toyobo MC Co., Ltd.).

[0020] <Cellulose ester resin> Cellulose ester resins are resins obtained by the esterification reaction of cellulose. Depending on the type of cellulose and carboxylic acid used in the esterification reaction, the degree of esterification, etc., cellulose ester resins with various hydroxyl values, Tg, and Mn can be obtained. Typical examples include cellulose acetate (CA), cellulose acetate propinate (CAP), and cellulose acetate butyrate (CAB), all of which have a pyran ring, a type of heterocycle derived from cellulose, in their main chain. The use of cellulose ester resins is preferable because they provide good hardness and transmittance of the UV shielding layer.

[0021] Commercially available CAB products include CAB-551-0.01 (Mn 16,000, hydroxyl value 50 mg KOH / g, Tg 85℃, manufactured by Eastman Chemical), CAB-551-0.2 (Mn 30,000, hydroxyl value 53 mg KOH / g, Tg 101℃, manufactured by Eastman Chemical), and CAB-553-0.4 (Mn 20,000, hydroxyl value 158 mg KOH / g, Tg 136℃, manufactured by Eastman Chemical). Examples include CAB-531-1 (Mn 40,000, hydroxyl value 56 mg KOH / g, Tg 115℃, manufactured by Eastman Chemical), CAB-500-5 (Mn 57,000, hydroxyl value 33 mg KOH / g, Tg 96℃, manufactured by Eastman Chemical), and Solus2100 (Mn 6,000, hydroxyl value 50 mg KOH / g, Tg 75℃, manufactured by Eastman Chemical).

[0022] Examples of commercially available CAP products include CAP-482-0.5 (Mn 25,000, hydroxyl value 86 mg KOH / g, Tg 142℃, manufactured by Eastman Chemical Corporation).

[0023] <Epoxy resin> Epoxy resins are compounds containing epoxy groups. Using epoxy resins is preferable in terms of coating hardness. Commercially available epoxy resins include JER828 (bisphenol A (BPA) type, manufactured by Mitsubishi Chemical Corporation), JER1007 (BPA type, manufactured by Mitsubishi Chemical Corporation), JER1010 (BPA type, manufactured by Mitsubishi Chemical Corporation), JER807 (bisphenol F (BPF) type, manufactured by Mitsubishi Chemical Corporation), and JER4007P (BPF type, manufactured by Mitsubishi Chemical Corporation).

[0024] <Phenoxy resin> Phenoxy resin is a polyhydroxy polyether obtained by reacting aromatic diols (such as bisphenol A and bisphenol F) with epichlorohydrin. The use of phenoxy resin is preferable because it has high hardness and a relatively high refractive index, resulting in good visibility.

[0025] Commercially available phenoxy resins include JER1256 (Mn 10,000, hydroxyl value 190 mg KOH / g, Tg 95℃, manufactured by Mitsubishi Chemical Corporation), JER4250 (Mn 9,000, hydroxyl value 180 mg KOH / g, Tg 70℃, manufactured by Mitsubishi Chemical Corporation), JER4275 (Mn 8,000, hydroxyl value 170 mg KOH / g, Tg 68℃, manufactured by Mitsubishi Chemical Corporation), PKHA (Mn 9,000, hydroxyl value 200 mg KOH / g, Tg 81℃, manufactured by Gabriel Phenoxies), and PKHB (Mn 9,500, hydroxyl value 203 mg KOH / g, Tg 84℃, manufactured by Gabriel Phenoxies). PKHC (Mn 11,000, hydroxyl value 201 mg KOH / g, Tg 89℃, manufactured by Gabriel Phenoxies), PKHJ (Mn 16,000, hydroxyl value 200 mg KOH / g, Tg 98℃, manufactured by Gabriel Phenoxies), PKHH (Mn 13,000, hydroxyl value 201 mg KOH / g, Tg 98℃, manufactured by Gabriel Phenoxies), PKFE (Mn 16,000, Tg 98℃, manufactured by Gabriel Phenoxies) YP-50 (manufactured by Gabriel Phenoxies), PKCP-80 (Tg 30℃, manufactured by Gabriel Phenoxies), YP-50 (Mn 14,000, Tg 84℃, manufactured by Nippon Steel Chemical & Material), YP-55U (Mn 10,000, hydroxyl value 283 mg KOH / g, Tg 83℃, manufactured by Nippon Steel Chemical & Material), YP-50S (hydroxyl value 284 mg KOH / g, Tg 84℃, manufactured by Nippon Steel Chemical & Material), YP-70 (hydroxyl value 270 mg Examples include FX-293 (Mn 10,500, hydroxyl value 160 mg KOH / g, Tg 158°C, manufactured by Nippon Steel Chemical & Material Co., Ltd.), FX-310 (Mn 9,500, hydroxyl value 164 mg KOH / g, Tg 110°C, manufactured by Nippon Steel Chemical & Material Co., Ltd.), and FX-280S (Mw 42,000, hydroxyl value 330 mg KOH / g, Tg 158°C, manufactured by Nippon Steel Chemical & Material Co., Ltd.).

[0026] <Polyvinyl acetal resin> Polyvinyl acetal resin is a resin obtained by acetalizing polyvinyl alcohol with an aldehyde. Depending on the type of aldehyde used (acetaldehyde, butyraldehyde, etc.), polyvinyl acetal resins such as polyvinyl acetal and polyvinyl butyral are well known. Butyral resin has a 1,3-dioxane ring in its main chain, which is a type of heterocycle derived from cellulose formed by butyralization. Using polyvinyl acetal resin is preferable because it has high transparency and good transmittance of the ultraviolet shielding layer.

[0027] Commercially available polyvinyl acetal resins include BL-10 (Mn 18,500, hydroxyl value 247 mg KOH / g, Tg 59℃, manufactured by Sekisui Chemical Co., Ltd.), BX-L (Mn 20,000, hydroxyl value 353 mg KOH / g, Tg 74℃, manufactured by Sekisui Chemical Co., Ltd.), and BM-5 (Mn 60,000, hydroxyl value 406 mg KOH / g, Tg 73℃, manufactured by Sekisui Chemical Co., Ltd.).

[0028] <Hydroxyl value of resin (A)> The hydroxyl value of resin (A) is preferably 1 to 400 mg KOH / g. When resin (A) is an aromatic polyester resin, the hydroxyl value is preferably 1 to 60 mgKOH / g, and more preferably 2 to 50 mgKOH / g. When resin (A) is a cellulose ester resin, the hydroxyl value is preferably 30 to 350 mgKOH / g, and more preferably 40 to 100 mgKOH / g. If resin (A) is a phenoxy resin, the hydroxyl value is preferably 100 to 400 mg KOH / g, and more preferably 150 to 350 mg KOH / g. If the hydroxyl value of resin (A) is within the above range, it is expected that the adhesion to the substrate and flexibility will be further improved.

[0029] <Tg of resin (A)> The Tg of resin (A) is preferably -30 to 170°C, and more preferably 30 to 150°C. When the Tg is above -30°C, the hardness and scratch resistance are further improved. Furthermore, when the Tg is below 170°C, the adhesion and flexibility of the UV-blocking layer are further improved.

[0030] In this specification, Tg is a value measured by DSC (Differential Scanning Calorimetry), and details of the measurement method are described in the Examples.

[0031] <Mn of resin (A)> The Mn value of resin (A) is preferably 1,000 to 100,000, more preferably 2,000 to 80,000, and even more preferably 2,500 to 70,000. Within this numerical range, adhesion to the UV-blocking layer and flexibility are further improved.

[0032] When resin (A) is an aromatic polyester resin, Mn is preferably 3,000 to 20,000, and better effects can be expected. When resin (A) is a phenoxy resin, Mn is preferably 8,000 to 14,000, and better effects can be expected. When resin (A) is a cellulose ester resin, Mn is preferably 15,000 to 40,000, and better effects can be expected. When resin (A) is polyvinyl acetal resin, Mn is preferably between 15,000 and 70,000, and a better effect can be expected.

[0033] In this specification, Mn refers to the value measured by GPC (gel permeation chromatography), and details of the measurement method are described in the Examples.

[0034] <Hydrogen-reactive curing agent (B)> The curing agent (B) that can react with hydroxyl groups (hereinafter sometimes abbreviated as "curing agent (B)") has a functional group that can react with hydroxyl groups, and it is preferable that it has multiple functional groups that can react with hydroxyl groups. Examples of curing agents (B) include amino resins, isocyanate compounds, blocked isocyanate compounds, and polycarboxylic acid anhydrides. Curing agents (B) can be used alone or in combination of two or more types.

[0035] <Amino resin> Examples of amino resins include melamine resin, benzoguanamine resin, urea resin, and thiourea resin. Of these, melamine resin is preferred, and examples of alkylated melamine resins include Yuban 125 (butylated melamine resin, Mitsui Chemicals), Yuban 225 (butylated melamine resin, Mitsui Chemicals), Yuban 22R (butylated melamine resin, Mitsui Chemicals), Cymel 303 (methylated melamine resin, Ornex), and Cymel 301 (methylated melamine resin, Ornex).

[0036] <Isocyanate compounds> As isocyanate compounds, polyisocyanates are preferred, and examples include aromatic polyisocyanates, aliphatic polyisocyanates, and alicyclic polyisocyanates.

[0037] Aromatic polyisocyanates include trimethylolpropane adducts of tolylene diisocyanate, isocyanurates of tolylene diisocyanate, trimethylolpropane adducts of xylylene diisocyanate, and oligomers of 4,4'-diphenylmethane diisocyanate.

[0038] Aliphatic polyisocyanates include the biuret derivative of hexamethylene diisocyanate (HDI), the isocyanurate derivative of HDI, the trimethylolpropane adduct derivative of HDI, the oligomer of HDI, and the uretdione derivative of HDI.

[0039] Alicyclic polyisocyanates include isocyanurates of isophorone diisocyanate (IPDI) and oligomers of IPDI. Other examples include polyisocyanates such as isocyanurates of copolymers composed of tolylene diisocyanate and hexamethylene diisocyanate.

[0040] <Blocked isocyanate compounds> A blocked isocyanate compound (sometimes also called a blocked isocyanate compound or blocked isocyanate compound) is a compound in which the reactivity of the isocyanate group (sometimes called the isocyanate group) of an isocyanate compound is inactivated at room temperature by adding an active hydrogen compound called a blocking agent. The isocyanate compound portion in a blocked isocyanate compound is sometimes called the base isocyanate, and specifically refers to the isocyanate compounds mentioned above. Blocked isocyanate compounds are curing agents in which the blocking agent dissociates upon heating, generating an isocyanate group.

[0041] The temperature at which the blocking agent dissociates from the blocked isocyanate compound (abbreviated as "dissociation temperature") is preferably 80 to 180°C, and more preferably 90 to 150°C. A dissociation temperature of 80°C or higher improves the storage stability of the curable resin composition and further improves adhesion. Furthermore, a dissociation temperature of 180°C or lower tends to improve crosslinking density, thus further improving the hardness and flexibility of the coating film. Moreover, a dissociation temperature of less than 140°C further improves the dimensional stability of the substrate.

[0042] The above dissociation temperature is generally determined by the type of blocking agent. Preferred blocking agents include methyl ethyl ketone oxime (MEKO, dissociation temperature 150°C), dimethylpyrazole (DMP, dissociation temperature 110°C), diethyl malonate (DEM, dissociation temperature 110°C), ε-caprolactam (E-CAP, dissociation temperature 170°C), butanone oxime (dissociation temperature 160°C), and phenol (dissociation temperature 170°C), with methyl ethyl ketone oxime (MEKO, dissociation temperature 150°C), dimethylpyrazole (DMP, dissociation temperature 110°C), and diethyl malonate (DEM, dissociation temperature 110°C) being more preferred, with dissociation temperatures of 150°C or lower. Note that the dissociation temperature may vary slightly depending on the type of base isocyanate.

[0043] A blocked isocyanate compound consisting of a base isocyanate selected from IPDI trimmers, HDI biuret bodies, and HDI trimmers, and a blocking agent selected from DMP and DEM is preferable because it not only exhibits excellent storage stability in curable resin compositions, but also has a relatively low dissociation temperature, which reduces the thermal load on the substrate during curing of the curable resin composition and is expected to improve the properties of the ultraviolet shielding layer.

[0044] <Mixing ratio of resin (A) and hardener (B)> The proportions of resin (A) and hardener (B) used will vary depending on the types of resin (A) and hardener (B) used, but generally, it is preferable to mix 0.25 to 200 parts by mass of hardener (B) for every 100 parts by mass of resin (A). When resin (A) is an aromatic polyester resin, it is preferable to blend 0.5 to 30 parts by mass of curing agent (B) with 100 parts by mass of resin (A). When resin (A) is a cellulose ester resin, it is preferable to blend 2.0 to 50 parts by mass of curing agent (B) per 100 parts by mass of resin (A). When resin (A) is a phenoxy resin, it is preferable to blend 1.5 to 150 parts by mass of curing agent (B) per 100 parts by mass of resin (A). When the resin (A) is a polyvinyl acetal resin, it is preferable to blend 1.5 to 150 parts by mass of the curing agent (B) with respect to 100 parts by mass of the resin (A). When used within the above range, the adhesion to the base material of the curable resin composition is further improved.

[0045] The curing agent (B) is preferably an isocyanate compound and a blocked isocyanate compound in terms of flexural resistance and bleedability.

[0046] <Molar ratio of hydroxyl group in resin (A) to isocyanate group in curing agent (B)> The molar ratio of the hydroxyl group in the resin (A) to the isocyanate group in the curing agent (B) (hereinafter abbreviated as the NCO / OH molar ratio) can be calculated based on the following formula from the hydroxyl value (mgKOH / g) of the resin (A) and the content rate of the isocyanate group contained in the curing agent (B) (based on mass%, hereinafter abbreviated as NCO%). X A (Number of moles of hydroxyl group contained in resin (A) (parts by mass) = Mass of resin (A) × Hydroxyl value of resin (A) (mgKOH / g) / 1000 / 56.11 (formula weight of potassium hydroxide) X B : Number of moles of isocyanate group contained in curing agent (B) = Mass of curing agent (B) × NCO% / 42.02 (formula weight of isocyanate group) NCO / OH molar ratio = X A / X B

[0047] The NCO / OH ratio of the resin (A) is preferably 0.01 to 6.0. When the resin (A) is an aromatic polyester resin, the NCO / OH ratio is preferably 0.05 to 5.0, more preferably 0.2 to 3.0. When the resin (A) is a cellulose ester resin, the NCO / OH ratio is preferably 0.03 to 1.0, more preferably 0.05 to 0.3. When resin (A) is a phenoxy resin, the NCO / OH ratio is preferably 0.01 to 0.5, and more preferably 0.02 to 0.3. When the resin (A) is polyvinyl acetal resin, the NCO / OH ratio is preferably 0.01 to 0.5, and more preferably 0.01 to 0.3. When used within the aforementioned range, the adhesion of the curable resin composition to the light-transmitting substrate is further improved.

[0048] <Curing accelerator> The curable resin composition of the present invention may be formulated with a curing accelerator to accelerate the curing reaction. Examples of curing accelerators include organometallic compounds such as bismuth carboxylates, dicyandiamides, tertiary amine compounds, phosphine compounds, imidazole compounds, carboxylic acid hydrazides, dialkylureas, and acid anhydrides.

[0049] The curing accelerator is preferably added in an amount of 0.01 to 10 parts by mass, more preferably 0.05 to 5 parts by mass, and even more preferably 0.1 to 2 parts by mass, per 100 parts by mass of resin (A). The curing accelerator can be used alone or in combination of two or more types.

[0050] <UV absorber (C)> The curable resin composition of the present invention has ultraviolet shielding properties by containing an ultraviolet absorber (C). Examples of such ultraviolet absorbers include benzotriazole-based, hydroxyphenyltriazine-based, benzophenone-based, and cyanoacrylate-based ultraviolet absorbers. Hydroxyphenyltriazine-based and dihydroxybenzophenone-based ultraviolet absorbers are preferred in terms of minimizing adverse effects on other physical properties of the coating film. One type of ultraviolet absorber or two or more types may be used in combination.

[0051] Examples of UV absorbers include the "TINUVIN" series (benzotriazole and hydroxyphenyltriazine based) and "CHIMASSORB" series from Ciba Specialty Chemicals, Inc., the "UVINUL" series (benzophenone, triazine, and cyanoacrylate based) from BASF Ltd., the "RUVA" series (benzotriazole based) from Otsuka Chemical Co., Ltd., the "ADEGASTAB LA" series (benzotriazole and triazine based) from ADEKA Corporation, and the "Eversorb" series (benzotriazole, triazine, and benzophenone based) from EverLight Chemicals.

[0052] From the viewpoint of bleed, it is desirable that the amount of UV absorber (C) added is small enough to absorb ultraviolet light, but the content is preferably 0.25 to 30 parts by mass, and more preferably 2 to 20 parts by mass, per 100 parts by mass of resin (A).

[0053] <Color Correction Agent (D)> Chromatic adjusters are additives that absorb light in the visible light spectrum to adjust the color tone and improve white clarity. While there are no particular limitations on the types of chromatic adjusters, dyes and pigments are mainly used as blue chromatic adjusters to adjust the yellowish tint of the UV-blocking layer.

[0054] Using only a blue color adjuster will result in a greenish tint (a * If the color shifts to the negative side, a red or purple color adjuster may be used in combination. * a * b * By adjusting the coordinates in the color system so that they are centered, the clarity of white can be improved.

[0055] Examples of dyes include organic dyes such as monoazo dyes, triarylmethane dyes, phthalocyanine dyes, and anthraquinone dyes, all of which contain an azo group within the molecule. Examples of inorganic pigments include dark blues such as iron blue, Prussian blue, Berlin blue, Turnbull blue, millery blue, Chinese blue, and Paris blue (iron cyano complex colorants), ultramarine blues such as ultramarine violet, and cobalt blue.

[0056] Examples of pigments include blue pigments, purple pigments, and red pigments. Examples of blue pigments include CI Pigment Blue 15, 15:1, 15:2, 15:3, 15:4, 15:6, 16, 22, 60, and 80. Among these, CI Pigment Blue 15:6 is preferred. As the purple pigment, CI Pigment Violet 19 or CI Pigment Violet 23 is preferred.

[0057] Examples of red pigments include CI Pigment Red 7, 9, 14, 41, 48:1, 48:2, 48:3, 48:4, 81:1, 81:2, 81:3, 97, 122, 123, 146, 149, 168, 177, 178, 180, 184, 185, 187, 192, 200, 202, 208, 210, 215, 216, 217, 220, 223, 224, 226, 227, 228, 240, 242, 246, 254, 255, 264, and 272. Among these, at least one of CI Pigment Red 48:1, 177, 242, and 254 is preferred.

[0058] From the viewpoint of heat resistance, light resistance, and weather resistance, it is preferable to use a pigment as the color adjuster (D). One type of color adjuster can be used alone, or two or more types can be used in combination.

[0059] The content of the chromaticity adjuster (D) can be adjusted as appropriate so that a light-transmitting film having an ultraviolet shielding layer of a predetermined thickness achieves the desired transmittance. For example, when the transmittance (ta) at 380 nm of a light-transmitting substrate having an ultraviolet shielding layer with a thickness of 5 μm is to be 3% or less, the content of the chromaticity adjuster (D) is preferably 0.005 to 2 parts by mass, and more preferably 0.01 to 1 part by mass, per 100 parts by mass of resin (A), from the viewpoint of suppressing yellowness and transparency. By setting it within the above range, an ultraviolet shielding layer with good white clarity can be formed.

[0060] When a pigment is used as a chromaticity adjuster (D), the volume average primary particle diameter of the pigment is preferably 150 nm or less, more preferably 100 nm or less, and even more preferably 20 to 60 nm or less, from the viewpoint of transparency of the ultraviolet shielding layer.

[0061] In this specification, the volume-average primary particle diameter (MV) of a pigment is calculated by measuring the short-axis diameter and long-axis diameter of the primary pigment particles in an image obtained by observation with a transmission electron microscope (TEM), considering the average value of the short-axis diameter and long-axis diameter as the particle size (d), assuming the obtained particle size is spherical, determining the volume (V) of the pigment particle, and calculating the value for any 100 pigment particles based on the following formula. MV = Σ(V·d) / Σ(V)

[0062] The average dispersed particle size (D50) of the pigment in the cured resin composition is preferably 50 to 100 nm. In this specification, the average dispersed particle size (D50) of the pigment in the cured resin composition is the 50% particle size (median diameter) in the volume-based cumulative particle size distribution (volume basis), and can be measured using a particle size distribution analyzer that uses dynamic light scattering (such as the "NANOTRAC WAVE II EX150" manufactured by Microtrac-Bel).

[0063] When dispersing the pigment, it can be dispersed using industry-known dispersion equipment (kneader, roll mill, etc.). Furthermore, when dispersing the pigment, industry-known dispersants such as pigment derivatives, resin-type dispersants, and surfactants may be included as appropriate.

[0064] <Solvent> The curable resin composition of the present invention may contain a solvent. By adding a solvent, it becomes easier to adjust the viscosity to one suitable for printing (coating). The solvent can be appropriately selected depending on the solubility of the hydroxyl group-containing resin (A) used, the printing method, etc. Examples of solvents include water and organic solvents. Examples of organic solvents include ketone solvents, glycol ether solvents, ester solvents, aliphatic hydrocarbon solvents, alicyclic hydrocarbon solvents, aromatic hydrocarbon solvents, and alcohol solvents.

[0065] Examples of ketone-based solvents include acetone, methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, diacetone alcohol, cyclohexanone, and isophorone. Glycol ether solvents include monoalkyl glycol ether solvents such as ethylene glycol monoethyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, propylene glycol monomethyl ether, and propylene glycol monoethyl ether, as well as dialkyl glycol ether solvents such as diethylene glycol dimethyl ether and diethylene glycol diethyl ether. Ester solvents include ethyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, amyl acetate, ethyl lactate, dimethyl carbonate, ε-caprolactone, γ-butyrolactone, and carboxylic acid ester solvents of the above monoalkyl glycol ethers. Aliphatic hydrocarbon solvents include hexane and heptane. Alicyclic hydrocarbon solvents include cyclohexane and methylcyclohexane. Aromatic hydrocarbon solvents include toluene, xylene, and tetralin. Alcohol solvents include methanol, ethanol, and propanol. The solvent is preferably used in an amount of 5 to 75% by mass in the curable resin composition. The solvent can be used alone or in combination of two or more types.

[0066] <Optical components> The optical component of the present invention has an ultraviolet shielding layer disposed on at least one surface of a light-transmitting substrate. The ultraviolet shielding layer comprises a cured product of a resin having hydroxyl groups (A) and a curing agent (B) that can react with hydroxyl groups, an ultraviolet absorber (C), and a chromaticity adjuster (D), and has a transmittance (ta) of 3% or less at a wavelength of 380 nm and a transmittance (tb) of 65% or more at a wavelength of 420 nm. By having a transmittance (ta) of 3% or less at a wavelength of 380 nm, deterioration of the optical component due to ultraviolet light can be prevented. Furthermore, by having a transmittance (tb) of 65% or more at a wavelength of 420 nm, high white clarity of the optical component can be obtained. Preferably, the transmittance (ta) is 1.5% or less, and the transmittance (tb) is 70% or more. Also, from the viewpoint of white clarity, L * a * b * In a color system, b * It is preferable that -1.5 or more and 1.2 or less. Also, a * It is preferable that the value is between -2.5 and 1.5.

[0067] <Light transparent base material> A light-transmitting substrate (hereinafter sometimes abbreviated as "substrate") refers to a substrate that is transparent in the visible range. There are no particular restrictions on the thickness of the substrate, but generally, a thickness of 10 to 700 μm is preferred, and 20 to 250 μm is more preferred, from the viewpoint of strength, workability such as handling, and thin layer formation.

[0068] Specific examples of light-transmitting substrates include amorphous polyolefin resin films, polyester resin films, polyethylene terephthalate resin films, acrylic resin films, polycarbonate resin films, polysulfone resin films, alicyclic polyimide resin films, polycycloolefin resin films, triacetylcellulose (TAC) films, and other resin films, as well as glass substrates.

[0069] <Manufacturing of optical components> The optical component of the present invention can be manufactured, for example, by coating the curable resin composition of the present invention onto a light-transmitting substrate. For example, after coating the substrate with the curable resin composition of the present invention, the coated curable resin composition can be crosslinked and cured by heating.

[0070] Methods for coating substrates include bar coating, blade coating, spin coating, reverse coating, dyeing, spray coating, roll coating, gravure coating, microgravure coating, lip coating, air knife coating, screen coating, and dipping. Furthermore, the drying and curing process may use known drying and curing equipment such as a hot air oven, infrared oven, or microwave oven. The conditions for heat drying and curing using a hot air oven are typically 80 to 180°C for 2 to 120 minutes, preferably 80 to 150°C for 2 to 60 minutes, and more preferably 80 to 130°C for 2 to 30 minutes.

[0071] The thickness of the UV-blocking layer is usually around 1 to 20 μm, but 2 to 10 μm is preferable. A thickness of 1 to 20 μm provides good UV-blocking properties and flexibility.

[0072] As described above, the optical component of the present invention can be used in electronic devices equipped with various displays such as organic electroluminescent (EL) displays, liquid crystal displays, and electronic paper. [Examples]

[0073] The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples. Note that "parts" refers to "parts by mass" and "%" refers to "percentage by mass". Unless otherwise specified, the amounts in the table are in parts by mass.

[0074] The materials used in the examples and comparative examples are described below. <Resin> [Resin (a-1)] Elitel UE-3320 (aromatic polyester resin, Mn 1,800, hydroxyl value 60 mg KOH / g, Tg 40℃, manufactured by Unitika Corporation). [Resin (a-2)] JER1007 (Bisphenol A type epoxy resin, Mn 2,900, hydroxyl value 20 mg KOH / g, Tg 56℃, manufactured by Mitsubishi Chemical Corporation). [Resin (a-3)] Byron 220 (aromatic polyester resin, Mn 3,000, hydroxyl value 50 mg KOH / g, Tg 53℃, manufactured by Toyobo MC Co., Ltd.). [Resin (a-4)] JER1010 (Bisphenol A type epoxy resin, Mn 5,500, hydroxyl value 36 mg KOH / g, Tg 59℃, manufactured by Mitsubishi Chemical Corporation).

[0075] [Resin (a-5)] Elitel UE-9885 (aromatic polyester resin, Mn 6,000, hydroxyl value 1 mg KOH / g, Tg 82℃, manufactured by Unitika Corporation). [Resin (a-6)] Elitel UE-3380 (aromatic polyester resin, Mn 8,000, hydroxyl value 15 mg KOH / g, Tg 60℃, manufactured by Unitika Corporation). [Resin (a-7)] Byron 200 (aromatic polyester resin, Mn 17,000, hydroxyl value 6 mg KOH / g, Tg 67℃, manufactured by Toyobo MC Co., Ltd.).

[0076] [Resin (a-8)] Elitel UE-9800 (aromatic polyester resin, Mn 15,000, hydroxyl value 3 mg KOH / g, Tg 101℃, manufactured by Unitika Corporation).

[0077] [Resin (a-9)] Elitel UE-3410 (aromatic polyester resin, Mn 23,000, hydroxyl value 3 mg KOH / g, Tg -32℃, manufactured by Unitika Corporation). [Resin (a-10)] Elitel UE-3400 (aromatic polyester resin, Mn 25,000, hydroxyl value 4 mg KOH / g, Tg -20℃, manufactured by Unitika Corporation). [Resin (a-11)] Elitel UE-3500 (aromatic polyester resin, Mn 30,000, hydroxyl value 4 mg KOH / g, Tg 15℃, manufactured by Unitika Corporation). [Resin (a-12)] Elitel UE-3510 (aromatic polyester resin, Mn 34,000, hydroxyl value 4 mg KOH / g, Tg -25℃, manufactured by Unitika Corporation).

[0078] [Resin (a-13)] JER4250 (phenoxy resin, Mn 9,000, hydroxyl value 180 mg KOH / g, Tg 70℃, manufactured by Mitsubishi Chemical Corporation). [Resin (a-14)] FX-310 (phenoxy resin, Mn 9,500, hydroxyl value 345 mg KOH / g, Tg 110℃, manufactured by Nippon Steel Chemical & Material Co., Ltd.). [Resin (a-15)] YP-55U (Phenoxy resin, Mn 10,000, hydroxyl value 198 mg KOH / g, Tg 84℃, Mitsubishi Chemical) [Resin (a-16)] FX-293 (phenoxy resin, Mn 10,500, hydroxyl value 352 mg KOH / g, Tg 158℃, manufactured by Nippon Steel Chemical & Material Co., Ltd.). [Resin (a-17)] PKHH (phenoxy resin, Mn 13,000, hydroxyl value 201 mg KOH / g, Tg 98℃, manufactured by Gabriel Phenoxies).

[0079] [Resin (a-18)] In a reaction apparatus equipped with a stirrer, thermometer, reflux condenser, and nitrogen gas inlet, 127.4 parts of a polyester polyol (Kuraray Polyol P-2030, Mn2033, manufactured by Kuraray Co., Ltd.) with isophthalic acid and 3-methyl-1,5-pentanediol as constituent monomers, 1.9 parts of dimethylolbutanoic acid, 15.9 parts of isophorone diisocyanate, 0.04 parts of dibutyltin dilaurate, and 43 parts of diethylene glycol monoethyl ether acetate were charged and reacted at 90°C for 5 hours under a nitrogen atmosphere. Subsequently, 175 parts of diethylene glycol monoethyl ether acetate were added to obtain a solution of polyurethane resin (a-18) with Mn19,000, Tg17°C, an aromatic ring with a hydroxyl value of 3 mgKOH / g, and a non-volatile content of 40%.

[0080] [Resin (a-19)] CAB-551-0.01 (CAB resin, Mn 16,000, hydroxyl value 50 mg KOH / g, Tg 85℃, manufactured by Eastman Chemical Company). [Resin (a-20)] CAP-482-0.5 (CAP resin, Mn 25,000, hydroxyl value 86 mg KOH / g, Tg 142℃, manufactured by Eastman Chemical Company). [Resin (a-21)] CAB-551-0.2 (CAB resin, Mn 30,000, hydroxyl value 53 mg KOH / g, Tg 101℃, manufactured by Eastman Chemical Company). [Resin (a-22)] CAB-171-15 (CAB resin, Mn 65,000, hydroxyl value 36 mg KOH / g, Tg 161℃, manufactured by Eastman Chemical Company).

[0081] [Resin (a-23)] CAB-398-3 (CAB resin, Mn 50,000, hydroxyl value 116 mg KOH / g, Tg 189℃, manufactured by Eastman Chemical Company). [Resin (a-24)] Esrec BL-10 (polyvinyl acetal resin, Mn 18,500, hydroxyl value 247 mg KOH / g, Tg 59℃, manufactured by Sekisui Chemical Co., Ltd.). [Resin (a-25)] Esrec BM-5 (polyvinyl acetal resin, Mn 60,000, hydroxyl value 406 mg KOH / g, Tg 73 °C, manufactured by Sekisui Chemical Co., Ltd.). [Resin (a-26)] ARUFON UH-2170 (acrylic resin, Mn 14,000, hydroxyl value 88 mg KOH / g, Tg 60 °C, manufactured by Toagosei Co., Ltd.), a resin having no ring structure.

[0082] [Resin (a-27)] Solvayne C (vinyl chloride / vinyl acetate copolymer resin, Mn 31,000, hydroxyl value 0 mg KOH / g, Tg 70 °C, manufactured by Nisshin Chemical Industry Co., Ltd.), a resin having no ring structure. [Resin (a-28)] JER YX4000 (biphenyl type epoxy resin, Mn 354, hydroxyl value 0 mg KOH / g, Tg 126 °C, manufactured by Mitsubishi Chemical Corporation), a resin having no hydroxyl group but having an aromatic ring. [Resin (a-29)] 紫光UV1700B (polyfunctional urethane (meth)acrylate, Mn 2000, acryloyl group number 10, hydroxyl value 0 mg KOH / g, manufactured by Mitsubishi Chemical Corporation), a resin having no hydroxyl group and no aromatic ring)

[0083] The Mn, Mw, Tg and hydroxyl value of the resins (a-1) to (a-29) listed in Tables 1 to 9 were determined according to the following method.

[0084] <Measurement of Mn and Mw> Measuring device: Shodex GPC-101 gel permeation chromatography system (manufactured by Showa Denko (currently Rezonac) Co., Ltd.) Column: GPC KF-G, KF805L, KF803L, KF802 (all manufactured by Rezonac) connected in series Detector: Shodex RI-71 differential refractive index detector (manufactured by Showa Denko (currently Rezonac) Co., Ltd.) Eluent: Tetrahydrofuran (THF) Flow rate: Sample side: 1 mL / min, Reference side: 0.5 mL / min Temperature: 40 °C Under the above conditions, 100 μL of a THF solution with a sample concentration of 0.2% was injected into the injection port of the measuring device, and measured up to a retention time of 50 minutes to obtain a chromatogram. In the obtained chromatogram, taking the rise of the first peak of the GPC curve as the starting point and the retention time of 50 minutes as the end point, the line connecting these points with a straight line was taken as the baseline. Mn and Mw were determined by the calibration curve method. The calibration curve used was prepared using 12 types of standard polystyrenes with known Mn below (all manufactured by Tosoh Corporation). F128 (1.09×10 6 ), F80 (7.06×10 5 ), F40 (4.27×10 5 ), F20 (1.90×10 5 ), F10 (9.64×10 4 ), F4 (3.79×10 4 ), F2 (1.81×10 4 ), F1 (1.02×10 4 ), A5000 (5.97×10 3 ), A2500 (2.63×10 3 ), A1000 (1.05×10 3 ), A500 (5.0×10 2 ). Mn and Mw were determined from the maximum values of the obtained peaks.

[0085] <Measurement of Tg> · Apparatus: Differential scanning calorimeter DSC-220C (manufactured by Seiko Instruments Inc.) · Sample: Approximately 10 mg (accurately weighed up to 0.1 mg) · Heating rate: Measured up to 200 °C at 10 °C / min Under the above conditions, the measurement was carried out. In the obtained DSC curve, the temperature at the intersection of the straight line obtained by extending the baseline on the low-temperature side to the high-temperature side and the broken line drawn at the point where the gradient of the curve on the low-temperature side of the melting peak is maximum was taken as Tg.

[0086] <Measurement of hydroxyl value> Measured in accordance with Japanese Industrial Standard JIS K0070:1992.

[0087] <Hardener> [Hardener b-1] Duranate MF-K60B (Blocked isocyanate, base isocyanate: HDI (hexamethylene diisocyanate), blocking agent: activated methylene, dissociation temperature 90°C, non-volatile content 60%, manufactured by Asahi Kasei Corporation)

[0088] [Hardening agent b-2] Desmodule BL3475BA / SN (Blocked isocyanate, base isocyanate: HDI, blocking agent: activated methylene, dissociation temperature 100°C, non-volatile content 75%, manufactured by Sumika Covestro Urethane Co., Ltd.)

[0089] [Hardening agent b-3] Duranate SBB-70P (blocked isocyanate, base isocyanate: HDI, dissociation temperature 110°C, non-volatile content 75%, manufactured by Asahi Kasei Corporation)

[0090] [Hardening agent b-4] Desmodule VPLS2253 (Blocked isocyanate, base isocyanate: HDI, blocking agent: DMP (dimethylpyrazole), dissociation temperature 120°C, non-volatile content 75%, manufactured by Sumika Covestro Urethane Co., Ltd.)

[0091] [Hardening agent b-5] Trixene BI7982 (Blocked isocyanate, Base isocyanate: HDI trimmer, Blocking agent: DMP, Dissociation temperature 120°C, Non-volatile content 70%, Manufactured by GSI Creos Corporation)

[0092] [Hardening agent b-6] Trixene BI7951 (blocked isocyanate, base isocyanate: IPDI (isophorone diisocyanate) trimer, blocking agent: DMP, dissociation temperature 120°C, non-volatile content 85%, manufactured by GSI Creos Corporation)

[0093] [Hardening agent b-7] Desmodule PL350 (Blocking isocyanate, base isocyanate: TDI (toluene diisocyanate), blocking agent: amines, dissociation temperature 120°C, non-volatile content 75%, manufactured by Sumika Covestro Urethane Co., Ltd.)

[0094] [Hardening agent b-8] Trixene BI7960 (Blocked isocyanate, Base isocyanate: HDI biuret, Blocking agent: DMP, Dissociation temperature 120°C, Non-volatile content 70%, Manufactured by GSI Creos Corporation)

[0095] [Hardening agent b-9] Trixene BI7992 (Blocked isocyanate, Base isocyanate: HDI trimmer, Blocking agent: DMP / DEM, Dissociation temperature 120°C, Non-volatile content 70%, Manufactured by GSI Creos Corporation)

[0096] [Hardening agent b-10] Duranate TPA-B80E (blocked isocyanate, base isocyanate: HDI, dissociation temperature 130°C, non-volatile content 80%, manufactured by Asahi Kasei Corporation)

[0097] [Hardening agent b-11] Desmodule BL4265 (Blocked isocyanate, base isocyanate: IPDI, blocking agent: methyl ethyl ketone oxime, dissociation temperature 140°C, non-volatile content 65%, manufactured by Sumika Covestro Urethane Co., Ltd.)

[0098] [Hardening agent b-12] Duranate MF-B60B (Blocked isocyanate, base isocyanate: HDI, blocking agent: methyl ethyl ketone oxime, dissociation temperature 150°C, non-volatile content 60%, manufactured by Asahi Kasei Corporation)

[0099] [Hardening agent b-13] Desmodule BL3272MPA (Blocked isocyanate, base isocyanate: HDI, blocking agent: ε-caprolactam, dissociation temperature 160℃, non-volatile content 72%, manufactured by Sumika Covestro Urethane Co., Ltd.)

[0100] [Hardening agent b-14] Desmodule VPLS2253 (Blocked isocyanate, base isocyanate: HDI trimmer, blocking agent: DMP, dissociation temperature 170°C, non-volatile content 75%, manufactured by Sumika Covestro Urethane Co., Ltd.)

[0101] [Hardening agent b-15] Desmodule BL1100 / 1 (Blocked isocyanate, base isocyanate: TDI, blocking agent: ε-caprolactam, dissociation temperature 170℃, non-volatile content 100%, manufactured by Sumika Covestro Urethane Co., Ltd.)

[0102] [Hardening agent b-16] Elastron BN-P18 (blocked isocyanate, base isocyanate: MDI (diphenylmethane diisocyanate), dissociation temperature 180°C, non-volatile content 100%, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.)

[0103] [Hardening agent b-17] Duranate 24A-100 (HDI Biuret, 100% non-volatile content, manufactured by Asahi Kasei Corporation)

[0104] [Hardening agent b-18] Sumijool N3300 (HDI isocyanate, 100% non-volatile content, manufactured by Sumika Covestro Urethane Co., Ltd.)

[0105] [Hardening agent b-19] Cymel 303 (butylated melamine resin, 100% non-volatile content, manufactured by Ornex Co., Ltd.)

[0106] <Curing accelerator> [Curing accelerator e-1] XK-614 (100% non-volatile content, manufactured by King Industries)

[0107] <UV absorber> [UV absorber c-1] Ubinal 3050 (Dihydroxybenzophenone-based UV absorber, contains hydroxyl groups, manufactured by BASF)

[0108] [UV absorber c-2] Ubinal 3030 (cyanoacrylate-based UV absorber, hydroxyl group-free, manufactured by BASF)

[0109] [UV absorber c-3] Tinuvin 477 (hydroxyphenyltriazine-based UV absorber, contains hydroxyl groups, manufactured by BASF)

[0110] <Solvent> [solvent s-1] Isophorone [solvent s-2] EDGAC (Diethylene Glycol Monoethyl Ether Acetate) [solvent s-3] PGMAC (Propylene Glycol Monoethyl Ether Acetate)

[0111] <Photopolymerization initiator> Irgacure OXE03 (oxime ester derivative, manufactured by BASF)

[0112] <Preparation of blue dispersion pigments> 100 parts of CI Pigment Blue 15:6 (Toyo Color Co., Ltd. "Lionol Blue ES"), 800 parts of crushed salt, and 100 parts of diethylene glycol were charged into a stainless steel 1-gallon kneader (Inoue Seisakusho Co., Ltd.) and kneaded at 70°C for 12 hours. This mixture was added to 3000 parts of warm water and stirred in a high-speed mixer for about 1 hour while heating to about 70°C to form a slurry. After repeated filtration and washing with water to remove salt and solvent, it was dried at 80°C for 24 hours to obtain 98 parts of finely milled blue pigment (BP). The MV of the obtained pigment was 28.3 nm.

[0113] <Preparation of blue pigment dispersion (dB)> The following mixtures were stirred and mixed until homogeneous. Then, using 0.5 mm diameter zirconia beads, the mixture was dispersed for 5 hours in an Eiger mill (Eiger Japan's "Mini Model M-250MKII"), and filtered through a 5.0 μm filter to obtain a pigment dispersion. The pigment dispersion was adjusted with PGMAc to have a non-volatile content of 20% by mass, and the dB level was obtained. Blue micronized pigment (BP): 11.1 parts Dispersant (Adisper PB821, manufactured by Ajinomoto Fine Techno Co., Ltd.): 12.1 parts PGMAC: 76.8 copies The D50 of the obtained dispersion was 55 nm.

[0114] <Preparation of pigments for purple dispersions> 100 parts of CI Pigment Violet 23 (LIONOGEN VIOLET FG-6140, manufactured by Toyo Color Co., Ltd.), 800 parts of crushed salt, and 100 parts of diethylene glycol were charged into a stainless steel 1-gallon kneader (manufactured by Inoue Seisakusho Co., Ltd.) and kneaded at 70°C for 12 hours. This mixture was added to 3000 parts of warm water and stirred in a high-speed mixer for about 1 hour while heating to about 70°C to form a slurry. After repeated filtration and washing with water to remove salt and solvent, it was dried at 80°C for 24 hours to obtain 95 parts of finely milled purple pigment (VP). The MV of the obtained pigment was 53.7 nm.

[0115] <Preparation of purple pigment dispersion (dV)> After stirring and mixing the following mixture until homogeneous, it was dispersed for 3 hours using 0.5 mm diameter zirconia beads in an Eiger mill (Eiger Japan "Mini Model M-250 MKII"), and then filtered through a 5.0 μm pore size filter to obtain a pigment dispersion. The pigment dispersion was adjusted with P GMAc to have a non-volatile content of 20% by mass to prepare a violet dispersion (dV). Purple fine pigment (VP): 14.0 parts Dispersant (Adisper PB821, manufactured by Ajinomoto Fine Techno Co., Ltd.): 10.1 parts PGMAc: 75.9 parts The D50 of the obtained dispersion was 100 nm.

[0116] <Preparation of pigments for red dispersions> 200 parts of CI Pigment Red 254 (BASF "S3610CF"), 1400 parts of sodium chloride, and 360 parts of diethylene glycol were charged into a stainless steel 1-gallon kneader (Inoue Seisakusho Co., Ltd.) and kneaded at 80°C for 6 hours. Next, this mixture was added to 8000 parts of warm water and stirred for 2 hours while heating to 80°C to form a slurry. After repeated filtration and washing with water to remove sodium chloride and diethylene glycol, it was dried at 85°C overnight to obtain 190 parts of finely milled red pigment (RP). The MV was 27.6 nm.

[0117] <Preparation of red pigment dispersion (dR)> The following mixtures were stirred and mixed until homogeneous. After dispersion for 5 hours using 0.5 mm diameter zirconia beads in an Eiger mill (Eiger Japan "Mini Model M-250 MKII"), the mixture was filtered through a 5.0 μm filter to obtain a pigment dispersion. The pigment dispersion was adjusted with PGMAc to have a non-volatile content of 20% by mass to prepare a red pigment dispersion (dR). Red fine pigment (RP): 14.4 parts Dispersant (Adisper PB821, manufactured by Ajinomoto Fine Techno Co., Ltd.): 10.1 parts Propylene glycol monomethyl ether acetate: 75.5 parts The D50 of the obtained dispersion was 50 nm.

[0118] <Volume-average primary particle size (MV) of pigments> The volume-average primary particle size (MV) of the pigment was determined by measuring the short-axis and long-axis diameters of 100 primary particles of the pigment using transmission electron microscope (TEM) images. The average of the short-axis and long-axis diameters was taken as the particle size (d) of the pigment particle. Then, assuming that each pigment particle was a sphere with the measured particle size, the volume (V) of each particle was calculated. This process was repeated for 100 pigment particles, and the volume-average particle size (MV) obtained from the following formula was taken as the average primary particle size (MV) of the pigment. MV = Σ(V·d) / Σ(V)

[0119] <Average dispersed particle diameter (D50)> The average dispersed particle size (D50) was measured using a dynamic light scattering particle size distribution analyzer (NANOTRAC WAVE II EX150, Microtrac-Bell). PGMAc was used as the diluent, and D50 was defined as the average of three 60-second measurements taken at concentrations within the range of 1.0 ± 0.2.

[0120] <Example 1> To a resin varnish with a non-volatile content of 40%, 100 parts of resin a-1 was dissolved in 150 parts of isophorone. To this varnish, 2.20 parts of hardener b-5, 0.15 parts of curing accelerator e-1 (XK-640, manufactured by KING INDUSTRIES, bismuth carboxylate), 8.50 parts of ultraviolet absorber c-1, and 1.56 parts of blue pigment dispersion dB (non-volatile content 20.0%, pigment concentration in non-volatile content 47.8%) (of which 0.149 parts is blue pigment), and 179.60 parts of adjusting solvent to adjust the non-volatile content to 25% were added and the mixture was uniformly stirred to prepare curable resin composition liquid 1. An evaluation optical component was obtained by coating a 50 μm thick light-transmitting substrate (polyethylene terephthalate (PET) film (Toray Industries, Ltd.: Lumirror U403)) with a transmittance of 85% at 380 nm and 88% at 420 nm with a curable resin composition liquid 1 prepared by bar coating using a bar coater, drying in a hot air oven at 130°C for 30 minutes, and obtaining an evaluation optical component with a film thickness (ultraviolet shielding layer) of 5 μm after drying.

[0121] <Examples 2-17, 19-56, 60-78>, <Comparative Examples 1-9> Similar to Example 1, curable resin compositions were prepared according to Tables 1-9, and optical components for evaluation were obtained. The meanings of the symbols used in the tables are described below. PM: Propylene glycol monomethyl ether Pcon: Pigment concentration in non-volatile matter (mass%)

[0122] <Example 18> To 250 parts of polyurethane resin (a-18) solution, 2.20 parts of curing agent b-5, 0.15 parts of curing accelerator e-1, 8.50 parts of ultraviolet absorber c-1, 1.56 parts of blue pigment dispersion dB, and 110.50 parts of non-volatile content adjusting solvent were added and uniformly stirred to prepare a curable resin composition liquid 18. Then, an evaluation optical component for Example 18 was obtained in the same manner as in Example 1.

[0123] <Example 57> To a resin varnish with a non-volatile content of 40%, 100 parts of resin (a-7) were dissolved in 150 parts of isophorone. To this varnish, 0.15 parts of curing accelerator e-1, 8.50 parts by mass of ultraviolet absorber c-1, 1.56 parts of blue pigment dispersion dB (of which 0.149 parts by mass is blue pigment), and 181.39 parts of non-volatile content adjusting solvent were added and the mixture was uniformly stirred to prepare a curable resin mixture. Next, 1.92 parts of curing agent b-15 and 441.60 parts of the curable resin mixture were mixed and uniformly stirred to prepare a curable resin composition liquid 57. Then, an optical component for evaluation of Example 57 was obtained in the same manner as in Example 1.

[0124] <Example 58> A curable resin mixture was prepared in the same manner as in Example 57. Next, 1.03 parts by mass of curing agent b-16 and 495.85 parts by mass of the curable resin mixture were mixed according to Table 6 to produce a curable resin composition liquid, and then the evaluation optical member for Example 58 was obtained in the same manner as in Example 1.

[0125] <Example 59> A curable resin mixture was prepared in the same manner as in Example 57. Next, 20.0 parts by mass of curing agent b-17 and 495.85 parts by mass of the curable resin mixture were mixed according to Table 6 to produce a curable resin composition liquid, and then the evaluation optical member for Example 59 was obtained in the same manner as in Example 1.

[0126] <Comparative Example 10> A curable resin composition liquid was prepared by adding 100 parts of resin a-29, 10.0 parts of photopolymerization initiator Irgacure OXE03, 8.50 parts of UV absorber c-1, 1.87 parts of blue pigment dispersion dB (non-volatile content 20.0%, pigment concentration in non-volatile content 47.8%) (of which blue pigment content is 0.179 parts), and 117.4 parts of adjusting solvent (s-3) to bring the non-volatile content to 50%, and stirring uniformly. The mixture was then coated onto a 50 μm thick light-transmitting substrate (polyethylene terephthalate (PET) film (Toray Industries, Ltd.: Lumirror U403)) with a transmittance of 85% at 80 nm and 88% at 420 nm using a bar coater, drying in a hot air oven at 100°C for 2 minutes, and exposing it to ultraviolet light at 400 mJ / cm² using a high-pressure mercury lamp with an output of 80 w / cm². 2 An evaluation optical component was obtained by irradiating and curing the coating layer, resulting in a coating film (ultraviolet shielding layer) with a thickness of 5 μm after curing.

[0127] [Table 1]

[0128] [Table 2]

[0129] [Table 3]

[0130] [Table 4]

[0131] [Table 5]

[0132] [Table 6]

[0133] [Table 7]

[0134] [Table 8]

[0135] [Table 9]

[0136] Using the obtained evaluation optical material, the film thickness, transmittance, and a were determined using the following method. * , b * We measured and evaluated the pencil hardness, adhesion, warping, whiteness, flexibility, and bleeding properties. The results are shown in Tables 9-16.

[0137] <Film thickness measurement> The thickness of the coating on the obtained evaluation optical components was measured using an MH-15M measuring instrument (manufactured by Nikon Corporation).

[0138] <Measurement of Transmittance> The obtained optical components were evaluated using a Hitachi High-Tech U-4100 spectrophotometer to measure their transmittance at 380 nm (ta) and 420 nm (tb) under conditions of 23°C and 50% relative humidity (hereinafter 50%RH). The obtained measurement results were evaluated based on the following criteria. [TB evaluation criteria] ◎: 85% or higher (Excellent) ○: 75% to less than 85% (Good) △: 65% or more but less than 75% (no practical problems) ×: Less than 65% (Not practical) [TA evaluation criteria] ◎: Less than 1.5% (Excellent) ○: 1.5% or more and less than 2.0% (Good) △: 2.0% to 3% (no practical problems) ×: Greater than 3% (not practical)

[0139] * , b * Measurement > The obtained evaluation optical components were subjected to L25 light using a D65 light source under conditions of 23°C and 50% RH, using a spectroscopic haze meter "SH7000" manufactured by Nippon Denshoku Industries Co., Ltd. * a * b * a in color system * , b * The following criteria were used to evaluate the obtained measurement results. [b * [Evaluation Criteria] ◎: -0.3 or higher and less than 0.3 (Excellent) ○: -1.0 or higher and less than -0.3, or 0.3 or higher and less than 0.8 (good) △: -1.5 or greater and less than -1.0, or 0.8 or greater and 1.2 or less (no practical problems) ×: Less than -1.5 or greater than 1.2 (not practical) [a * [Evaluation Criteria] ◎: -0.3 or higher and less than 0.3 (Excellent) ○: -1.0 or higher and less than -0.3, or 0.3 or higher and less than 0.8 (good) △: -2.5 or greater and less than -1.0, or 0.8 or greater and 1.5 or less (no practical problems) ×: Less than -2.5 or greater than 1.5 (not practical)

[0140] <Pencil hardness> The obtained optical components for evaluation were cut to a size of 100 mm (long side) x 50 mm (short side) to create test films. The surface of the coating (UV shielding layer) of the obtained test films was measured five times according to the test method conforming to JIS K5600-5-4 scratch hardness (pencil method) (2002). The obtained measurement results were judged based on the following evaluation criteria. [Evaluation Criteria] ◎: Pencil hardness F or higher (excellent, no scratches at all) ○: Pencil hardness is HB (good; scratches from pencils occur less than once out of 5 attempts)​ △: Pencil hardness is B (No more than 3 pencil scratches out of 5 attempts, and no exposed surface on the base material. No practical problems.) ×: Pencil hardness 2B or lower (Scratches from the pencil may expose the surface of the base material. Not suitable for practical use.)

[0141] <Adhesion> The coating surface of the obtained optical components for evaluation was subjected to a grid-pattern peel test in accordance with ASTM (American Society for Testing Materials) D3359-23, and evaluated according to the following criteria. [Evaluation Criteria] ◎: Number of peeled pieces 0 / 100 (Excellent) ○: Number of peeled areas 1-5 / 100 (good) △: Number of peeled areas: 6-35 / 100 (No practical problems) ×: Number of peeled pieces 36-100 / 100 (Not practical)

[0142] <Warpage Test> The obtained optical components for evaluation were punched out using an SD-type lever-type sample cutter (SDL-100, manufactured by Dumbbell Co., Ltd.) with a 100mm (long side) x 50mm (short side) cutting die set in it, creating a test film of 100mm (long side) x 50mm (short side). This test film was left in a constant temperature and humidity chamber at 23°C and 50%RH for 6 hours. The test film was placed with the coated side down, with the long side in contact with the horizontal surface of the laboratory bench, and the distance between the two ends of the convexly curved short side was measured using a microgauge, and the average value was calculated. [Evaluation Criteria] ◎: 45mm or more (Excellent) ○: 35mm or more and less than 45mm (good) △: 30mm or more but less than 35mm (no practical problems) ×: Cylindrical or less than 30mm (not practical)

[0143] <White clarity> White clarity was evaluated by placing the obtained evaluation optical component with the coated surface facing upwards on a Konica Minolta colorimeter calibration plate (CIE Y=94.9, x=0.3135, y=0.3205, hereinafter referred to as the standard plate), visually assessing the difference in color between it and the standard plate, and determining the result according to the evaluation criteria below. [Evaluation Criteria] ◎: No noticeable difference in color compared to the standard board (superior) ○: Has a slight color tint compared to the standard board (good) △: It clearly has a color tint compared to the standard board, but the color of the standard board is still discernible (no practical problems). ×: The color is too dark, making it impossible to distinguish the color of the standard board (unusable).

[0144] <Flexibility Test> The obtained optical components for evaluation were cut into 180 mm long x 30 mm wide pieces to form test films. Under conditions of 23°C and 50% RH, these test films were subjected to a flexibility test using a Yuasa System Equipment Co., Ltd. DLDMLH-FS planar unloaded U-shaped stretch tester, with a bending interval of 5 mm and the coated surface facing outward, repeating the process 10,000 times. After the test, the bent portions of the test films were magnified 20 times under an optical microscope and evaluated according to the following evaluation criteria. [Evaluation Criteria] ◎: No change in appearance compared to before the test (Excellent) ○: Fewer than 5 minor scratches were observed on the folded portion (good). △: Five to ten small cracks or scratches were observed in the folded area (no practical problems). ×: More than 10 cracks or other damage were observed in the folded area (unsuitable for practical use).

[0145] <Breeding properties> Under conditions of 23°C and 50%RH, the haze of the evaluation optical component was measured three times using a D65 light source with a spectroscopic haze meter "SH7000" manufactured by Nippon Denshoku Industries, Ltd., and the average value was defined as haze h1. Next, the same evaluation optical component was stored in a high-temperature, high-humidity oven at 85°C and 85%RH for 48 hours, and then stored in a constant temperature and humidity chamber at 23°C and 50%RH for 6 hours. The haze was then measured three times in the same manner as above, and the average value was defined as haze h2. The difference between the obtained h1 and h2 (h2-h1) was calculated, and the bleedability was judged based on the evaluation criteria below. [Evaluation Criteria] ◎: (h2-h1)≦0.1 (Excellent) ○:0.1<(h2-h1)≦0.2(good) △: 0.2 < (h2 - h1) ≤ 0.3 (No practical problems) ×: 0.3 < (h2-h1) (Not practical)

[0146] As shown in Tables 10 to 18, the optical component and curable resin composition of the present invention can provide an electronic device comprising an optical component in which an ultraviolet shielding layer is disposed on at least one surface of a light-transmitting substrate, which protects the display area from external ultraviolet rays, improves white clarity, prevents scratches during the production process, prevents curling due to curing shrinkage, conforms to curved surfaces, prevents defects such as coating breakage and peeling from the substrate when bent, does not bleed ultraviolet absorbers, can accommodate thinning of the ultraviolet shielding layer, and improves adhesion to the light-transmitting substrate.

[0147] [Table 10]

[0148] [Table 11]

[0149] [Table 12]

[0150] Table 13

[0151] Table 14

[0152] Table 15

[0153] Table 16

[0154] Table 17

[0155] Table 18

Claims

1. An optical member comprising a light-transmitting substrate with an ultraviolet shielding layer disposed on at least one surface thereof, wherein the ultraviolet shielding layer comprises a cured product of a resin having hydroxyl groups (A) and a curing agent (B) that can react with hydroxyl groups, an ultraviolet absorber (C), and a chromaticity adjuster (D), and the transmittance (ta) of the ultraviolet shielding layer at a wavelength of 380 nm is 3% or less, and the transmittance (tb) at a wavelength of 420 nm is 65% or more.

2. The optical member according to claim 1, wherein the resin (A) having hydroxyl groups includes an aromatic polyester resin or a cellulose ester resin.

3. L * a * b * In a color system, b * The optical member according to claim 1, wherein the value is -1.5 or more and 1.2 or less.

4. L * a * b * In a color system, a * The optical member according to claim 1, wherein the value is -2.5 or more and 1.5 or less.

5. A curable resin composition for forming an ultraviolet shielding layer in an optical member having an ultraviolet shielding layer disposed on at least one surface of a light-transmitting substrate, comprising a resin having hydroxyl groups (A), a curing agent that can react with hydroxyl groups (B), an ultraviolet absorber (C), and a chromaticity adjuster (D).

6. An electronic device comprising an optical member according to any one of claims 1 to 4.

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