JP4882328B2 - Optical laminate - Google Patents

Description

  The present invention relates to an optical laminate in which interface reflection and interference fringes are prevented, surface mechanical strength is excellent, and adhesion between a light-transmitting substrate and a hard coat layer is good.

  An image display surface in an image display device such as a liquid crystal display (LCD) or a cathode ray tube display device (CRT) is required to reduce reflection due to light rays emitted from an external light source and to improve its visibility. On the other hand, by using an optical laminate (for example, an antireflection laminate) in which an antiglare layer or an antireflection layer is formed on a light transmissive substrate, reflection of the image display surface of the image display device can be achieved. It is common to reduce and improve visibility.

  However, in an optical laminated body in which layers having a large difference in refractive index are laminated, it has often been observed that interface reflection and interference fringes occur at the interface between the layers that overlap each other. In particular, it has been pointed out that when black is reproduced on the image display surface of the screen display device, interference fringes are conspicuously generated, and as a result, the visibility of the image is lowered and the aesthetic appearance of the image display surface is impaired. Yes. In particular, when the refractive index of the light-transmitting substrate is different from the refractive index of the hard coat layer, interference fringes are likely to occur.

The hard coat layer is usually formed by forming a thin coating film on a transparent substrate film using an ionizing radiation curable resin such as a thermosetting resin or an ultraviolet curable resin. Therefore, the mechanical strength (pencil hardness) was not sufficiently high due to the influence of the deformation of the underlying base material.
If the thickness of the hard coat layer is increased, the hardness will improve, but the hard coat layer will be easily cracked and peeled off, and at the same time, the curl due to curing shrinkage of the hard coat layer will increase, and it will not be usable practically. It was.

On the other hand, in Patent Document 1, on the transparent substrate film, a medium refractive index layer having a refractive index of 1.5 to 1.7, a high refractive index layer having a refractive index of 1.6 to 1.8, By using an antireflection hard coat sheet in which a low refractive index layer made of a lower refractive index material than a high refractive index layer is laminated in this order from the transparent substrate film side, interfacial reflection and interference fringes can be eliminated. Proposals have been made to do this. This prior art can be said to have been made by paying attention to the refractive index of each layer. Patent Document 2 proposes a method of forming a hard coat layer on a base material using a resin containing a solvent that dissolves the base material.
On the other hand, in Patent Document 3, even if the thickness of the entire hard coat layer is 10 to 50 μm by containing a certain amount of inorganic fine particles in the hard coat layer forming material, the hard coat layer is cracked or peeled off as in the prior art, and A hard coat film having excellent hardness while preventing curling has been proposed.

JP 2003-75605 A JP 2003-205563 A JP 2000-112379 A

  The present invention effectively prevents the occurrence of interfacial reflection and interference fringes between a light-transmitting substrate and a hard coat layer, has excellent visibility, excellent surface mechanical strength, and light-transmitting substrate-hard coat layer. The object of the present invention is to provide an optical laminate having good adhesion.

  The present inventors form a thin layer using a resin having specific physical properties at the interface between the light-transmitting substrate and the hard coat layer, and specify fine particles having a specific average particle size in the hard coat layer. The optical lamination effectively prevents the occurrence of interface reflection and interference fringes, and has excellent visibility, excellent surface mechanical strength, and good adhesion between the light-transmitting substrate and the hard coat layer. The knowledge that a body can be obtained was obtained, and the present invention was completed.

The optical layered body according to the present invention is a thin layer formation containing a resin (A) having a weight average molecular weight of 200 or more and 1000 or less and having two or more (meth) acryl groups on a cellulose triacetate substrate. A thin layer formed by forming a coating film of the composition for use and cured with ultraviolet rays or ionizing radiation, and a prepolymer, an oligomer having a polymerizable unsaturated bond or an epoxy group at least in the molecule on the thin layer , And / or a resin (B) which is an ionizing radiation curable composition containing a monomer and a hard coat layer-forming composition coating film containing silica fine particles having an average particle size of 10 to 40 nm, and ultraviolet or ionized it was cured at a radiation hard coat layer containing 20 to 60 parts by weight the silica microparticles relative to the resin (B) 100 parts by weight is formed by at least laminated, image It shows an optical stack for the device.

  Such an optical layered body can prevent the occurrence of interface reflection and interference fringes by controlling the refractive index between the light-transmitting substrate and the hard coat layer due to the presence of the thin layer. Furthermore, since the hard coat layer has the above-described configuration, even if the entire thickness of the hard coat layer is increased to about 10 to 100 μm, the hard coat layer can be prevented from cracking and peeling, and excellent scratch resistance. An optical layered body that has adhesiveness, mechanical strength, and adhesion between a light-transmitting substrate and a hard coat layer can be realized.

In the optical layered body according to the present invention, the resin (B) contains an unsaturated dicarboxylic acid and a polyhydric alcohol condensate, polyester (meth) acrylate, epoxy (meth) acrylate, urethane (meth) acrylate, polyether (meta). ), Acrylate, polyol (meth) acrylate, melamine (meth) acrylate, and one or two or more selected from the group consisting of cationic polymerization type epoxy compounds are preferred.
In the optical layered body according to the present invention, the resin (B) preferably contains at least 30 to 70% by weight of urethane (meth) acrylate. In this case, the balance between elasticity and plasticity of the hard coat layer is improved, and the hardness is high, so that the hard coat layer is hardly damaged or broken during transportation and processing during production.

Further, in the optical laminate according to the present invention, the resin (A) is ethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, neopentyl glycol di (meth). Acrylate, 1,6-hexanediol di (meth) acrylate, triethylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, 1,4-butanediol di (meth) ) Acrylate, isocyanuric acid EO (ethylene oxide) modified di (meth) acrylate, bisphenol FEO (ethylene oxide) modified di (meth) acrylate, bisphenol AEO (ethylene oxide) modified di (meth) acrylate, 3 One selected from the group consisting of methylpentanediol di (meth) acrylate, poly 1,2-butadiene di (meth) acrylate, diethylene glycol bis β-acryloyloxypropinate, hydroxypivalate ester neopentyl glycol di (meth) acrylate Or it is preferable that it is a mixture of 2 or more types.

In the optical laminate according to the present invention, the hard coat layer may contain an antistatic agent and / or an antiglare agent.
The optical layered body according to the present invention can be formed by forming an antistatic layer, an antiglare layer, a low refractive index layer, or two or more of these layers on the hard coat layer.
The optical laminate according to the present invention is preferably used as an antireflection laminate.

  According to the present invention, it is possible to effectively prevent the occurrence of interface reflection and interference fringes between a light-transmitting substrate and a hard coat layer, excellent visibility, excellent surface mechanical strength, and light-transmitting substrate-hard. An optical laminate having good adhesion between the coat layers can be provided.

The optical layered body according to the present invention comprises a thin layer formed of a resin (A) having a weight average molecular weight of 200 or more and 1000 or less and having two or more functional groups on a light-transmitting substrate. On the thin layer, at least the resin (B) and silica fine particles having an average particle diameter of 10 to 40 nm are formed. The silica fine particles are 20 to 60 parts by weight with respect to 100 parts by weight of the resin (B). The contained hard coat layer is at least laminated.
Such an optical layered body can prevent the occurrence of interface reflection and interference fringes by controlling the refractive index between the light-transmitting substrate and the hard coat layer due to the presence of the thin layer. Furthermore, even if the hard coat layer contains a specific amount of silica fine particles having a specific average particle diameter, the hard coat layer is cracked and peeled even if the entire thickness of the hard coat layer is increased to about 10 to 100 μm. Thus, an optical laminate having excellent scratch resistance, mechanical strength, and adhesion between the light-transmitting substrate and the hard coat layer can be realized.

  FIG. 1 shows the basic layer structure of the optical laminate of the present invention. The optical laminate 1 is formed of a light-transmitting substrate 2, a thin layer 3 and a hard coat layer 4 thereon. Furthermore, in consideration of the function or application as an optical laminate, other layers such as an antistatic layer, an antiglare layer, a low refractive index layer, etc. are formed on the hard coat layer, or two or more layers. Also good. Hereafter, each layer which comprises the optical laminated body of this invention is demonstrated in order.

1. Optical laminate (thin layer)
In the optical layered body according to the present invention, a thin layer is formed on the light transmissive substrate with a resin (A) having a weight average molecular weight of 200 or more and 1000 or less and having two or more functional groups. By forming this thin layer, in the case of a laminate in which a hard coat layer is provided directly on a light transmissive substrate, interfacial reflection and interference occurred at the interface between the light transmissive substrate and the hard coat layer. It is possible to effectively prevent the generation of fringes. In the present invention, the “thin layer” includes concepts such as a thin film and a thin coating film. According to a preferred embodiment of the present invention, the thickness of the thin layer is 0.001 μm or more and 50 μm or less, preferably the lower limit is 0.01 μm or more and the upper limit is 20 μm or less.

1) Resin (A)
The resin (A) used for forming the thin film has two or more functional groups and has a weight average molecular weight of 200 or more and 1000 or less, preferably a lower limit of 220 or more and an upper limit of 900 or less.
Specific examples of such a resin (A) include (meth) acrylic resin (in this specification, acrylic and / or methacryl is described as (meth) acrylic), polyester resin, polyolefin resin, polycarbonate resin, polyamide. Resin, polyether resin, epoxy resin, urethane resin, alkyd resin, spiroacetal resin, polybutadiene resin, polythiol polyether resin, polyhydric alcohol, ethylene glycol (meth) acrylate (in this specification, acrylate and / or methacrylate 1 or a mixture of two or more selected from the group consisting of (meth) acrylate resins such as (meth) acrylate) and pentaerythritol (meth) acrylate monostearate, preferably ureta Resins.

  Specific examples of the resin (A) belonging to these include ethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6 -Compounds such as hexanediol di (meth) acrylate, triethylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate , Isocyanuric acid EO (ethylene oxide) modified di (meth) acrylate, bisphenol FEO (ethylene oxide) modified di (meth) acrylate, bisphenol AEO (ethylene oxide) modified di (meth) acrylate, -(Meth) acrylic such as methylpentanediol di (meth) acrylate, poly 1,2-butadiene di (meth) acrylate, diethylene glycol bis β-acryloyloxypropinate, hydroxypivalate ester neopentyl glycol di (meth) acrylate, etc. Acid esters, and urethane resins such as tolylene diisocyanate, 4-4′-diphenylmethane diisocyanate, xylylene diisocyanate, 3-isopropylene-dimethylbenzyl isocyanate hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated xylylene diisocyanate, and mixtures thereof Is mentioned.

  The resin has two or more functional groups. Specific examples of such “functional groups” include (meth) acrylate functional groups, hydroxyl groups, carboxyl groups, epoxy groups, amino groups, vinyl groups, An alkoxyl group etc. and a mixture thereof are mentioned, Preferably (meth) acrylate type functional groups are mentioned.

  Such functional groups are preferably used in such a combination as to cause a curing reaction by ionizing radiation and / or heat after the formation of the coating film. In the case of a thin layer subjected to a curing reaction, the resin (A) contains a curing reaction product in the thin layer of the completed optical laminate. The curing reaction product of the resin (A) usually has a higher molecular weight than the resin (A) used.

2) Solvent When forming the thin film, the resin can be used by mixing with a solvent. Specific examples of the solvent include alcohols such as isopropyl alcohol, methanol and ethanol; ketones such as methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone; esters such as methyl acetate, ethyl acetate and butyl acetate; halogenated hydrocarbons; Aromatic hydrocarbons such as xylene; or mixtures thereof. Examples of more specific solvents include acetone, methyl acetate, ethyl acetate, butyl acetate, chloroform, methylene chloride, trichloroethane, tetrahydrofuran, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, nitromethane, 1,4-dioxane, dioxolane, N- Examples include methyl pyrrolidone, N, N-dimethylformamide, methanol, ethanol, isopropyl alcohol, butanol, isobutyl alcohol, diisopropyl ether, methyl cellosolve, ethyl cellosolve, and butyl cellosolve, more preferably methyl acetate, ethyl acetate, and acetic acid. Examples include butyl and methyl ethyl ketone. These solvents are effective in preventing interference fringes.

(Light transmissive substrate)
The light-transmitting substrate may be transparent, translucent, colorless, or colored as long as it transmits light, but is preferably colorless and transparent. Specific examples of the light-transmitting substrate include glass plates; triacetate cellulose (TAC), polyethylene terephthalate (PET), diacetyl cellulose, acetate propionate cellulose, acetate butyrate cellulose, polyethersulfone, (meth) acrylic Examples include a resin, a polyurethane resin, a polyester, a polycarbonate, a polysulfone, a polyether, a trimethylpentene, a polyether ketone, and a thin film formed of (meth) acrylonitrile. According to a preferred embodiment of the present invention, triacetate cellulose (TAC) is preferably mentioned. The thickness of the light-transmitting substrate is about 30 μm to 200 μm, preferably 40 μm to 200 μm.

[Hard coat layer]
The “hard coat layer” refers to a layer having a hardness of “H” or higher in a pencil hardness test specified by JIS 5600-5-4 (1999). The thickness of the hard coat layer (during curing) is in the range of 0.1 to 100 μm, preferably 0.8 to 20 μm. The hard coat layer is formed by laminating a composition for forming a hard coat layer formed of resin, silica fine particles, and optional components on the thin layer, followed by drying, and if necessary by ionizing radiation and / or heat. Obtained by curing.

1) Resin (B)
The resin (B) is preferably transparent, and specific examples thereof include ionizing radiation curable resins that are cured by ultraviolet rays or electron beams, or ionizing radiation curable compounds, ionizing radiation curable resins, and solvent-drying resins. And an ionizing radiation curable composition containing an ionizing radiation curable resin or an ionizing radiation curable compound.

  Examples of the ionizing radiation curable composition include those obtained by appropriately mixing a polymerizable unsaturated bond or a prepolymer having an epoxy group, an oligomer, and / or a monomer in the molecule. Here, the ionizing radiation refers to an electromagnetic wave or a charged particle beam having an energy quantum capable of polymerizing or crosslinking molecules, and usually an ultraviolet ray or an electron beam is used.

  Examples of prepolymers and oligomers in ionizing radiation curable compositions include unsaturated polyesters such as unsaturated dicarboxylic acid and polyhydric alcohol condensates, polyester (meth) acrylate, epoxy (meth) acrylate, urethane (meta ) Acrylates, polyether (meth) acrylates, polyol (meth) acrylates, (meth) acrylates such as melamine (meth) acrylates, and cationically polymerizable epoxy compounds. Among these, urethane (meth) acrylate is preferably used as an essential component, and further combined with polyester (meth) acrylate.

The polyester (meth) acrylate is composed of a polyester polyol oligomer (meth) acrylate or a mixture thereof. Further, the urethane (meth) acrylate is constituted by (meth) acrylate of an oligomer composed of a polyol compound and a diisocyanate compound.
The monomers used for the above (meth) acrylate formation are methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, methoxyethyl (meth) acrylate, butoxyethyl (meth) ) Acrylate, phenyl (meth) acrylate, and the like.

  In addition, a polyfunctional monomer can be used in combination when further imparting hardness to the coating film during the (meth) acrylate conversion. For example, trimethylolpropane tri (meth) acrylate, hexanediol (meth) acrylate, tripropylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and the like.

  Polyester oligomers are a condensation of adipic acid and glycol (ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, butylene glycol, polybutylene glycol, etc.) and triol (glycerin, trimethylolpropane, etc.), sebacic acid and glycol or triol. There are polyadipate polyol and polysebacate polyol as products. In addition, some or all of the aliphatic dicarboxylic acids can be replaced with other organic acids. For example, isophthalic acid, terephthalic acid, phthalic anhydride, or the like can be used as a component for imparting excellent hardness to the hard coat layer.

  The polyurethane-based oligomer can be obtained from an addition product of a polyisocyanate and a polyol. For example, adducts of methylene bis (p-phenylene diisocyanate), hexamethylene diisocyanate hexanetriol, hexamethylene diisocyanate, tolylene diisocyanate, tolylene diisocyanate / trimethylolpropane, 1,5-naphthylene diisocyanate, thio Selected from propyl diisocyanate, ethylbenzene-2,4-diisocyanate, 2,4-tolylene diisocyanate dimer, hydrogenated xylylene diisocyanate, tris (4-phenylisocyanate) thiophosphate, and the following polyols: It is obtained by reaction.

  Examples of polyols include polyether polyols such as polyoxytetramethylene glycol, polyester polyols such as polyadipate polyol and polycarbonate polyol, copolymers of (meth) acrylic acid esters and hydroxyethyl (meth) acrylate, and the like. .

  As commercially available products of urethane (meth) acrylate, purple light UV-1700B, purple light UV-6300B, and purple light UV-7600B (manufactured by Nippon Synthetic Chemical Co., Ltd.) are preferably used.

  Of all the resins (B) contained in the hard coat layer, the weight ratio of urethane (meth) acrylate is preferably 30 to 70% by weight, more preferably 50 to 70% by weight. In this case, the balance between elasticity and plasticity of the hard coat layer is improved, and the hardness is high, so that the hard coat layer is hardly damaged or broken during transportation and processing during production.

  Examples of the monomer in the ionizing radiation curable composition include styrene monomers such as styrene and α-methylstyrene, methyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and methoxyethyl (meth) acrylate. (Meth) acrylate esters such as butoxyethyl (meth) acrylate, butyl (meth) acrylate, methoxybutyl (meth) acrylate, phenyl (meth) acrylate, lauryl (meth) acrylate, (meth) Acrylic acid-2- (N, N-diethylamino) ethyl, (meth) acrylic acid-2- (N, N-dimethylamino) ethyl, (meth) acrylic acid-2- (N, N-dibenzylamino) methyl Unsaturated substituted alcohol alcohol esters such as (meth) acrylic acid-2- (N, N-diethylamino) propyl, ( T) Unsaturated carboxylic acid amides such as acrylamide, ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, triethylene Compounds such as glycol di (meth) acrylate, polyfunctional compounds such as dipropylene glycol di (meth) acrylate, ethylene glycol di (meth) acrylate, propylene glycol di (meth) methacrylate, diethylene glycol di (meth) acrylate, in the molecule A polythiol compound having two or more thiol groups, such as trimethylolpropane trithioglycolate, trimethylolpropane trithiopropylate, pentaerythritol tetrathioglycolate And the like.

  When using an ionizing radiation curable resin as an ultraviolet curable resin, it is preferable to use a photopolymerization initiator. Specific examples of the photopolymerization initiator include acetophenones, benzophenones, Michler benzoylbenzoate, α-amyloxime ester, tetramethylchuram monosulfide, and thioxanthones. Further, it is preferable to use a mixture of photosensitizers, and specific examples thereof include n-butylamine and triethylamine tri-n-butylphosphine.

  The solvent-drying resin used by mixing with the ionizing radiation curable resin mainly includes a thermoplastic resin. As the thermoplastic resin, those generally exemplified are used. By adding the solvent-drying resin, coating film defects on the coated surface can be effectively prevented. According to a preferred embodiment of the present invention, when the material of the transparent substrate is a cellulose resin such as TAC, as a preferred specific example of the thermoplastic resin, a cellulose resin such as nitrocellulose, acetylcellulose, cellulose acetate propionate, Examples thereof include ethyl hydroxyethyl cellulose.

  Specific examples of the thermosetting resin include phenol resin, urea resin, diallyl phthalate resin, melanin resin, guanamine resin, unsaturated polyester resin, polyurethane resin, epoxy resin, aminoalkyd resin, melamine-urea cocondensation resin, silicon resin. And polysiloxane resin. When a thermosetting resin is used, a curing agent such as a crosslinking agent and a polymerization initiator, a polymerization accelerator, a solvent, a viscosity modifier and the like can be further added as necessary.

2) Silica fine particles As the silica fine particles, powdered fine particle silica that does not contain a dispersion medium may be used. However, the dispersion step can be omitted, and colloidal silica using silica fine particles as a colloidal solution is used from the viewpoint of high productivity. Is preferred. The average particle diameter of silica is 10 to 40 nm from the viewpoint of hardness, more preferably 10 to 30 nm, and particularly preferably 10 to 20 nm. Although the dispersion medium to be used is not particularly limited, for example, alcohols such as water, methanol, ethanol, isopropanol, n-butanol and n-propanol, polyhydric alcohols such as ethylene glycol and propylene glycol, ethylene glycol monomethyl, etc. Polyethers such as ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, ketones such as methyl ethyl ketone, methyl isobutyl ketone and diacetone alcohol , Aromatic hydrocarbons such as toluene and xylene, amides such as dimethylacetamide, and the like. Of these, alcohols or ketones are preferable. The silica fine particles are preferably dispersed in a proportion of 10 to 60% by weight, more preferably 30 to 50% by weight, with respect to the dispersion medium.

  The content of silica fine particles is preferably more than 20 parts by weight and less than 60 parts by weight, and further 25 parts by weight or more and 40 parts by weight or less with respect to 100 parts by weight of the resin. If it is 20 parts by weight or less, the hardness of the hard coat layer surface may be insufficient, and if it is 60 parts by weight or more, the adhesion at the interface between the hard coat layer and the thin layer may be insufficient.

3) Antistatic agent and / or antiglare agent The hard coat layer according to the present invention preferably comprises an antistatic agent and / or an antiglare agent.

(Antistatic agent (conductive agent))
Specific examples of the antistatic agent that forms the antistatic layer include quaternary ammonium salts, pyridinium salts, various cationic compounds having a cationic group such as first to third amino groups, sulfonate groups, and sulfate esters. Anionic compounds having anionic groups such as bases, phosphate ester bases, phosphonate bases, amphoteric compounds such as amino acids and aminosulfate esters, nonionic compounds such as amino alcohols, glycerols, and polyethylene glycols, tin And organic metal compounds such as alkoxides of titanium and metal chelate compounds such as acetylacetonate salts thereof, and compounds obtained by increasing the molecular weight of the compounds listed above. Coupling having a tertiary amino group, a quaternary ammonium group, or a metal chelate moiety, and a monomer or oligomer polymerizable by ionizing radiation, or a polymerizable functional group polymerizable by ionizing radiation Polymerizable compounds such as organometallic compounds such as agents can also be used as antistatic agents.

Moreover, electroconductive ultrafine particles are mentioned. Specific examples of the conductive fine particles include those made of a metal oxide. Examples of such metal oxides include ZnO (refractive index 1.90, the numerical value in parentheses below represents the refractive index), CeO ₂ (1.95), Sb ₂ O ₂ (1.71), SnO. ₂ (1.997), indium tin oxide (1.95) often referred to as ITO, In ₂ O ₃ (2.00), Al ₂ O ₃ (1.63), antimony-doped tin oxide (abbreviation) ATO, 2.0), aluminum-doped zinc oxide (abbreviation: AZO, 2.0), and the like. The fine particles refer to those having a so-called submicron size of 1 micron or less, and preferably those having an average particle size of 0.1 nm to 0.1 μm.

(Anti-glare agent)
As the anti-glare agent, the same anti-glare agent as described in the item of the anti-glare layer described later is contained in an amount of 20 to 30 parts by weight, preferably 10 to 25 parts by weight based on 100 parts by weight of the resin. it can.

4) Solvent To form the hard coat layer, a hard coat layer composition in which the above components are mixed with a solvent is used. Specific examples of the solvent include alcohols such as isopropyl alcohol, methanol and ethanol; ketones such as methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone; esters such as ethyl acetate and butyl acetate; halogenated hydrocarbons; toluene, xylene and the like Aromatic hydrocarbons; or a mixture thereof, preferably ketones and esters.

[Other layers]
The optical layered body according to the present invention is basically composed of a light-transmitting substrate, a thin layer formed thereon, and a hard coat layer as described above. However, one or two or more layers described below may be formed on the hard coat layer in consideration of the function or application as an optical laminate. Furthermore, you may form including a middle refractive index layer and a high refractive index layer.

[Antistatic layer]
The antistatic layer comprises an antistatic agent and a resin. The antistatic agent and the solvent may be the same as described in the hard coat layer.

(resin)
As specific examples of the resin, a thermoplastic resin, a thermosetting resin, an ionizing radiation curable resin, or an ionizing radiation curable compound (including an organic reactive silicon compound) can be used. Although a thermoplastic resin can be used as the resin, it is more preferable to use a thermosetting resin, and more preferably an ionizing radiation curable composition containing an ionizing radiation curable resin or an ionizing radiation curable compound. .
The ionizing radiation curable composition is a mixture of a polymerizable unsaturated bond or a prepolymer, an oligomer, and / or a monomer having an epoxy group in a molecule.
Examples of the prepolymer, oligomer, and monomer in the ionizing radiation curable composition may be the same as those mentioned for the hard coat layer.

  Usually, as the monomer in the ionizing radiation curable composition, one or two or more kinds are mixed and used as necessary. In order to give the ionizing radiation curable composition normal application suitability, The prepolymer or oligomer is preferably 5% by weight or more, and the monomer and / or polythiol compound is preferably 95% by weight or less.

  When flexibility is required when an ionizing radiation curable composition is applied and cured, it is preferable to reduce the amount of monomer or use a (meth) acrylate monomer having 1 or 2 functional groups. When wear resistance, heat resistance, and solvent resistance are required when an ionizing radiation curable composition is applied and cured, a (meth) acrylate monomer having three or more functional groups is used. An ionizing radiation curable composition can be designed. Here, 2-hydroxy acrylate, 2-hexyl acrylate, and phenoxyethyl acrylate are exemplified as those having one functional group. Examples of those having 2 functional groups include ethylene glycol diacrylate and 1,6-hexanediol diacrylate. Examples of the functional group having 3 or more include trimethylolpropane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, and dipentaerythritol hexaacrylate.

  In order to adjust physical properties such as flexibility and surface hardness when an ionizing radiation curable composition is applied and cured, a resin that is not cured by ionizing radiation irradiation can be added to the ionizing radiation curable composition. . Specific examples of the resin include the following. Thermoplastic resins such as polyurethane resin, cellulose resin, polyvinyl butyral resin, polyester resin, acrylic resin, polyvinyl chloride resin, and polyvinyl acetate. Among these, addition of a polyurethane resin, a cellulose resin, a polyvinyl butyral resin, or the like is preferable from the viewpoint of improving flexibility.

  When hardening after application | coating of an ionizing radiation curable composition is performed by ultraviolet irradiation, a photoinitiator and a photoinitiator are added. As the photopolymerization initiator, in the case of a resin system having a radical polymerizable unsaturated group, acetophenones, benzophenones, thioxanthones, benzoin, benzoin methyl ether and the like are used alone or in combination. In the case of a resin system having a cationic polymerizable functional group, an aromatic diazonium salt, an aromatic sulfonium salt, an aromatic iodonium salt, a metatheron compound, a benzoin sulfonic acid ester or the like is used alone or as a mixture as a photopolymerization initiator. . The addition amount of a photoinitiator is 0.1-10 weight part with respect to 100 weight part of ionizing radiation-curable compositions.

In the ionizing radiation curable composition, the following organic reactive silicon compound may be used in combination.
1 of the organosilicon compound can be represented by the general formula R _m Si (OR ′) _n , R and R ′ represent an alkyl group having 1 to 10 carbon atoms, a subscript m of R and a subscript n of OR ′. Each is an integer satisfying the relationship m + n = 4.

  Specifically, tetramethoxysilane, tetraethoxysilane, tetra-iso-propoxysilane, tetra-n-propoxysilane, tetra-n-butoxysilane, tetra-sec-butoxysilane, tetra-tert-butoxysilane, tetrapenta Ethoxysilane, tetrapenta-iso-propoxysilane, tetrapenta-n-propoxysilane, tetrapenta-n-butoxysilane, tetrapenta-sec-butoxysilane, tetrapenta-tert-butoxysilane, methyltriethoxysilane, methyltripropoxysilane, methyltri Butoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, dimethylethoxysilane, dimethylmethoxysilane, dimethylpropoxysilane, dimethylbutoxysilane, methyl Silane, methyl diethoxy silane, hexyl trimethoxy silane and the like.

The organosilicon compound that can be used in combination with the ionizing radiation curable composition is a silane coupling agent. Specifically, γ- (2-aminoethyl) aminopropyltrimethoxysilane, γ- (2-aminoethyl) aminopropylmethyldimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ- Aminopropyltriethoxysilane, γ-methacryloxypropylmethoxysilane, N-β- (N-vinylbenzylaminoethyl) -γ-aminopropylmethoxysilane / hydrochloride, γ-glycidoxypropyltrimethoxysilane, aminosilane, methyl Methoxysilane, vinyltriacetoxysilane, γ-mercaptopropyltrimethoxysilane, γ-chloropropyltrimethoxysilane, hexamethyldisilazane, vinyltris (β-methoxyethoxy) silane, octadecyldimethyl [3- (trimethoxysilyl) propyl ] Ammonium chloride, methyltrichlorosilane, dimethyldichlorosilane and the like.
The thickness of the antistatic layer is preferably about 30 nm to 1 μm.

[Anti-glare layer]
The antiglare layer may be formed between the transparent substrate and the hard coat layer or the low refractive index layer. The antiglare layer may be formed of a resin and an antiglare agent, and the resin may be the same as described in the section of the hard coat layer.

According to a preferred aspect of the present invention, the antiglare layer has an average particle diameter of R (μm), and the maximum value from the substrate surface in the vertical direction of the convex and concave portions of the antiglare layer is Hmax (μm). And the average interval between the irregularities of the antiglare layer is Sm (μm), and the average inclination angle of the irregularities is θa, the following formula:
8R ≦ Sm ≦ 30R
R <Hmax <3R
1.3 ≦ θa ≦ 2.5
1 ≦ R ≦ 8
What satisfies all simultaneously is preferable.

  According to another preferred embodiment of the present invention, when the refractive indexes of the fine particles and the transparent resin composition are n1 and n2, respectively, Δn = | n1−n2 | <0.1 is satisfied. And the glare-proof layer whose haze value inside a glare-proof layer is 55% or less is preferable.

(Anti-glare agent)
Examples of the antiglare agent include fine particles, and the shape of the fine particles may be a true sphere or an ellipse, and preferably a true sphere. The fine particles may be inorganic or organic, but those formed of an organic material are preferred. The fine particles exhibit anti-glare properties and are preferably transparent. Specific examples of the fine particles include plastic beads, and more preferably those having transparency. Specific examples of plastic beads include styrene beads (refractive index 1.59), melamine beads (refractive index 1.57), acrylic beads (refractive index 1.49), acrylic-styrene beads (refractive index 1.54), Examples thereof include polycarbonate beads and polyethylene beads. The addition amount of the fine particles is about 2 to 30 parts by weight, preferably about 10 to 25 parts by weight with respect to 100 parts by weight of the transparent resin composition.

It is preferable to add an antisettling agent when adjusting the composition for the antiglare layer. This is because, by adding an anti-settling agent, precipitation of the anti-glare agent can be suppressed and the anti-glare agent can be uniformly dispersed in the solvent. Specific examples of the anti-settling agent include silica beads having an average particle size of 0.5 μm or less, preferably about 0.1 to 0.25 μm.
The film thickness (when cured) of the antiglare layer is 0.1 to 100 μm, preferably 0.8 to 20 μm. When the film thickness is within this range, the function as an antiglare layer can be sufficiently exhibited.

[Low refractive index layer]
The low refractive index layer is composed of a resin containing silica or magnesium fluoride, a fluorine resin as a low refractive index resin, silica or a fluorine resin containing magnesium fluoride, and a refractive index of 1.46 or less. The film can also be composed of a thin film of about 30 nm to 1 μm, or a thin film of silica or magnesium fluoride by chemical vapor deposition or physical vapor deposition. The resin other than the fluororesin is the same as the resin used for constituting the antistatic layer.

  More preferably, the low refractive index layer can be composed of a silicone-containing vinylidene fluoride copolymer. Specifically, this silicone-containing vinylidene fluoride copolymer is a monomer containing 30 to 90% vinylidene fluoride and 5 to 50% hexafluoropropylene (including percentages below, all in terms of mass). It is obtained by copolymerization using the composition as a raw material, and comprises 100 parts of a fluorine-containing copolymer having a fluorine content of 60 to 70% and 80 to 150 parts of a polymerizable compound having an ethylenically unsaturated group. A low refractive index having a refractive index of less than 1.60 (preferably 1.46 or less) which is a thin film having a film thickness of 200 nm or less and is provided with scratch resistance by using this resin composition. Form a layer.

  In the silicone-containing vinylidene fluoride copolymer constituting the low refractive index layer, the proportion of each component in the monomer composition is such that the vinylidene fluoride is 30 to 90%, preferably 40 to 80%, particularly preferably 40 to 40%. 70% and hexafluoropropylene is 5 to 50%, preferably 10 to 50%, particularly preferably 15 to 45%. This monomer composition may further contain 0 to 40%, preferably 0 to 35%, particularly preferably 10 to 30% of tetrafluoroethylene.

  In the above monomer composition, other copolymer components are, for example, in the range of 20% or less, preferably in the range of 10% or less, as long as the intended purpose and effect of the silicone-containing vinylidene fluoride copolymer are not impaired. Specific examples of such other copolymerization components are fluoroethylene, trifluoroethylene, chlorotrifluoroethylene, 1,2-dichloro-1,2-difluoroethylene, 2-bromo-3,3,3-trifluoroethylene, 3-bromo-3,3-difluoropropylene, 3,3,3-trifluoropropylene, 1,1,2-trichloro-3,3,3-tri Examples thereof include polymerizable monomers having fluorine atoms such as fluoropropylene and α-trifluoromethacrylic acid.

  The fluorine-containing copolymer obtained from the monomer composition as described above needs to have a fluorine content of 60 to 70%, preferably a fluorine content of 62 to 70%, particularly preferably 64 to 68. %. When the fluorine content is in such a specific range, the fluorine-containing polymer has good solubility in a solvent, and contains such a fluorine-containing polymer as a component. Since it has excellent adhesion to various substrates, it forms a thin film with high transparency and low refractive index and sufficiently excellent mechanical strength, so the scratch resistance of the surface on which the thin film is formed The mechanical properties such as the above can be made sufficiently high, which is extremely suitable.

  The fluorine-containing copolymer preferably has a molecular weight of 5,000 to 200,000, particularly 10,000 to 100,000 in terms of polystyrene-equivalent number average molecular weight. By using a fluorine-containing copolymer having such a molecular weight, the viscosity of the resulting fluorine-based resin composition becomes a suitable size, and therefore surely has a suitable coating property. It can be. The fluorine-containing copolymer preferably has a refractive index of 1.45 or less, particularly 1.42 or less, more preferably 1.40 or less. When a fluorine-containing copolymer having a refractive index exceeding 1.45 is used, a thin film formed from the obtained fluorine-based paint may have a small antireflection effect.

In addition, the low refractive index layer also can be formed of a thin film made of SiO _2, an evaporation method, a sputtering method, or a plasma CVD method or the like, or to form a SiO ₂ gel film from the sol solution containing SiO ₂ sol It may be formed by a method. The low refractive index layer, in addition to SiO ₂ also, the or a thin film MgF _2, but may be configured in other materials, in terms of high adhesion to the lower layer, it is preferable to use a SiO ₂ thin film. Among the above methods, when the plasma CVD method is used, it is preferable to use organosiloxane as a raw material gas under the condition that there is no other inorganic vapor deposition source, and to maintain the deposition target as low as possible. It is preferable.

2. Manufacturing method of optical laminate 1) Preparation of liquid composition Compositions for forming each layer such as a thin layer, a hard coat layer, and an antistatic layer are mixed and dispersed according to a general preparation method. May be adjusted accordingly. For mixing and dispersing, it is possible to appropriately disperse with a paint shaker or a bead mill.

2) Coating As specific examples of the coating method of the composition for forming each layer on the surface of each layer, such as the surface of the light transmissive substrate, spin coating method, dipping method, spray method, slide coating method, bar coating method, roll Various methods such as a coater method, a meniscus coater method, a flexographic printing method, a screen printing method, and a speed coater method can be used.

3. Use of optical laminate The optical laminate according to the present invention is used as a hard coat laminate, preferably as an antireflection laminate. The optical laminate according to the present invention is used for a transmissive display device. In particular, it is used for display displays of televisions, computers, word processors and the like. In particular, it is used on the surface of displays such as CRTs and liquid crystal panels.

  Hereinafter, the present invention will be described more specifically with reference to examples. These descriptions do not limit the present invention. In the examples, parts represent parts by weight unless otherwise specified.

The evaluation method performed in the Example mentioned later is as follows.
(1) Pencil hardness The pencil hardness of the surface of the hard coat layer of the obtained optical laminate was evaluated according to JIS K5400. The test was conducted 5 times, and the hardness of the pencil used when the appearance abnormality such as scratches was not recognized once or more was expressed. For example, the test was conducted 5 times using a 3H pencil, and if the scratch did not occur once or more, the hardness was indicated as 3H.

(2) Interference fringes The surface opposite to the hard coat layer of the optical laminate is rubbed with sandpaper, then black tape is applied for matting, and the optical laminate is visually observed from the surface of the hard coat layer. Evaluation was made based on evaluation criteria.
<Evaluation criteria>
Evaluation ○: No interference fringes were generated.
Evaluation x: Interference fringes were generated.

(3) Adhesiveness The adhesiveness of the obtained hard coat film was evaluated using the method of a cross cut test (JIS K5400). A case where there was a slight peeling at the intersection of the cuts, there was no peeling at a glance at a square, and the area of the defect portion was within 5% of the total square area, and a case where it exceeded 5% was rated as x.

Production Example 1: Preparation of thin layer forming composition A thin layer forming composition prepared by mixing and filtering in accordance with the composition table of Table 1 below was prepared.

（実施例１）
透明基材フィルムとして、８０μｍセルローストリアセテートフィルム（ＴＦ８０ＵＦ：商品名、富士写真フィルム（株）製）を用い、基材上に製造例１で調整した薄層形成用組成物を、乾燥厚みで１０μｍとなるように塗工し、９０ｍＪの紫外線にて硬化させた。その後、ポリエステルアクリレート（アロニックスＭ−９０５０：商品名、東亜合成（株）製）とウレタンアクリレートオリゴマー（紫光ＵＶ−１７００Ｂ：商品名、日本合成化学（株）製）の重量比が５０：５０となるように調製した樹脂１００重量部に対して、平均粒子径１０〜２０ｎｍのコロイダルシリカ（日産化学工業株式会社製、商品名「ＩＰＡ−ＳＴ」）をシリカ微粒子として２５重量部含有するように混合して得られたハードコート層形成用組成物を、乾燥膜厚で１０μｍとなるように薄層上に塗工し、９０ｍＪの紫外線にて硬化させることにより本発明の光学積層体を得た。

Example 1
Using a 80 μm cellulose triacetate film (TF80UF: trade name, manufactured by Fuji Photo Film Co., Ltd.) as the transparent substrate film, the composition for forming a thin layer prepared in Production Example 1 on the substrate was 10 μm in dry thickness. It was coated so that it was, and cured with 90 mJ ultraviolet rays. Thereafter, the weight ratio of polyester acrylate (Aronix M-9050: trade name, manufactured by Toa Gosei Co., Ltd.) and urethane acrylate oligomer (purple UV-1700B: trade name, manufactured by Nippon Synthetic Chemical Co., Ltd.) is 50:50. 100 parts by weight of the resin prepared as described above was mixed so that 25 parts by weight of colloidal silica having an average particle size of 10 to 20 nm (manufactured by Nissan Chemical Industries, Ltd., trade name “IPA-ST”) was contained as silica fine particles. The optical layered product of the present invention was obtained by applying the hard coat layer-forming composition obtained in this way onto a thin layer so as to have a dry film thickness of 10 μm and curing it with 90 mJ of ultraviolet light.

(Example 2)
As a resin (B), the weight ratio of polyester acrylate (Aronix M-9050: trade name, manufactured by Toa Gosei Co., Ltd.) and urethane acrylate oligomer (purple UV-1700B: trade name, manufactured by Nippon Synthetic Chemical Co., Ltd.) is 75: 25 parts by weight of colloidal silica having an average particle size of 10 to 20 nm (manufactured by Nissan Chemical Industries, Ltd., trade name “MEK-ST”) as silica fine particles is contained with respect to 100 parts by weight of the resin prepared to be 25. The optical layered body of the present invention was obtained in the same manner as in Example 1 except that the composition for forming a hard coat layer was obtained by mixing with the above.

(Example 3)
As a resin (B), a weight ratio of polyester acrylate (Aronix M-9050: trade name, manufactured by Toa Gosei Co., Ltd.) and urethane acrylate oligomer (purple UV-1700B: trade name, manufactured by Nippon Synthetic Chemical Co., Ltd.) is 25: The optical laminate of the present invention was obtained in the same manner as in Example 2 except that the hard coat layer-forming composition was obtained using the resin prepared to be 75.

Example 4
In the composition for forming the hard coat layer, mixed so as to contain 25 parts by weight of colloidal silica (manufactured by Mitsubishi Rayon Co., Ltd., trade name “Diabeam UK-3901T”) having an average particle size of 10 to 20 nm as silica fine particles, The optical layered body of the present invention was obtained in the same manner as in Example 1 except that the obtained composition for forming a hard coat layer was coated on a thin layer so as to have a dry film thickness of 20 μm.

(Example 5)
The weight ratio of polyester acrylate (Aronix M-9050: trade name, manufactured by Toagosei Co., Ltd.) and urethane acrylate oligomer (purple UV-1700B: trade name, manufactured by Nippon Synthetic Chemical Co., Ltd.) is 50:50. To 100 parts by weight of the prepared resin, a colloidal silica having an average particle diameter of 10 to 20 nm (trade name “Diabeam RQ-5001” manufactured by Mitsubishi Rayon Co., Ltd.) is mixed so as to contain 45 parts by weight as silica fine particles. An optical laminate of the present invention was obtained in the same manner as in Example 1 except that the composition for forming a hard coat layer was obtained.

(Example 6)
The weight ratio of polyester acrylate (Aronix M-9050: trade name, manufactured by Toa Gosei Co., Ltd.) and urethane acrylate oligomer (purple UV-1700B: trade name, manufactured by Nippon Synthetic Chemical Co., Ltd.) is 25:75. Hardened by mixing 45 parts by weight of colloidal silica (manufactured by Nissan Chemical Industries, Ltd., trade name “MIBK-ST”) having an average particle diameter of 10 to 20 nm with respect to 100 parts by weight of the prepared resin. An optical layered body was obtained in the same manner as in Example 1 except that the composition for forming a coat layer was obtained and coating was performed on a thin layer so that the dry film thickness was 15 μm.

(Comparative Example 1)
The weight ratio of polyester acrylate (Aronix M-9050: trade name, manufactured by Toagosei Co., Ltd.) and urethane acrylate oligomer (purple UV-1700B: trade name, manufactured by Nippon Synthetic Chemical Co., Ltd.) is 50:50. An optical laminate was obtained in the same manner as in Example 1 except that 100 parts by weight of the prepared resin was used as the composition for forming a hard coat layer, and colloidal silica was not used.

(Comparative Example 2)
The weight ratio of polyester acrylate (Aronix M-9050: trade name, manufactured by Toa Gosei Co., Ltd.) and urethane acrylate oligomer (purple UV-1700B: trade name, manufactured by Nippon Synthetic Chemical Co., Ltd.) is 80:20. An optical laminate was obtained in the same manner as in Example 1 except that 100 parts by weight of the prepared resin was used as the composition for forming a hard coat layer, and colloidal silica was not used.

(Comparative Example 3)
The weight ratio of polyester acrylate (Aronix M-9050: trade name, manufactured by Toagosei Co., Ltd.) and urethane acrylate oligomer (purple UV-1700B: trade name, manufactured by Nippon Synthetic Chemical Co., Ltd.) is 50:50. Hardened by mixing 10 parts by weight of colloidal silica (manufactured by Nissan Chemical Industries, Ltd., trade name “IPA-ST”) having an average particle diameter of 10 to 20 nm with respect to 100 parts by weight of the prepared resin. An optical laminate was obtained in the same manner as in Example 1 except that the composition for forming a coat layer was obtained.

(Comparative Example 4)
The weight ratio of polyester acrylate (Aronix M-9050: trade name, manufactured by Toagosei Co., Ltd.) and urethane acrylate oligomer (purple UV-1700B: trade name, manufactured by Nippon Synthetic Chemical Co., Ltd.) is 50:50. Hard coat layer by mixing 25 parts by weight of colloidal silica (manufactured by Nissan Chemical Industries, Ltd., trade name “Snowtex 20L”) having an average particle diameter of 50 nm with 100 parts by weight of the prepared resin. An optical laminate was obtained in the same manner as in Example 1, except that the forming composition was obtained.

(Comparative Example 5)
The weight ratio of polyester acrylate (Aronix M-9050: trade name, manufactured by Toagosei Co., Ltd.) and urethane acrylate oligomer (purple UV-1700B: trade name, manufactured by Nippon Synthetic Chemical Co., Ltd.) is 50:50. Hard coat layer by mixing 45 parts by weight of colloidal silica (manufactured by Nissan Chemical Industries, Ltd., trade name “Snowtex 20L”) with an average particle diameter of 50 nm as silica fine particles with respect to 100 parts by weight of the prepared resin An optical laminate was obtained in the same manner as in Example 1 except that the composition for formation was obtained and coating was performed on a thin layer so as to have a dry film thickness of 20 μm.

(Comparative Example 6)
The weight ratio of polyester acrylate (Aronix M-9050: trade name, manufactured by Toagosei Co., Ltd.) and urethane acrylate oligomer (purple UV-1700B: trade name, manufactured by Nippon Synthetic Chemical Co., Ltd.) is 50:50. Hardened by mixing 70 parts by weight of colloidal silica (manufactured by Nissan Chemical Industries, Ltd., trade name “MIBK-ST”) having an average particle diameter of 10 to 20 nm with 100 parts by weight of the prepared resin. An optical layered body was obtained in the same manner as in Example 1 except that the composition for forming a coat layer was obtained and coating was performed on a thin layer so that the dry film thickness was 20 μm.

(Comparative Example 7)
The weight ratio of polyester acrylate (Aronix M-9050: trade name, manufactured by Toagosei Co., Ltd.) and urethane acrylate oligomer (purple UV-1700B: trade name, manufactured by Nippon Synthetic Chemical Co., Ltd.) is 50:50. Hardened by mixing 70 parts by weight of colloidal silica (manufactured by Nissan Chemical Industries, Ltd., trade name “MIBK-ST”) having an average particle diameter of 10 to 20 nm with 100 parts by weight of the prepared resin. An optical laminate was obtained in the same manner as in Example 1 except that the composition for forming a coat layer was obtained.

(Comparative Example 8)
Without forming a thin layer on the transparent substrate, colloidal silica (manufactured by Nissan Chemical Industries, Ltd., trade name “IPA-ST”) having an average particle size of 10 to 20 nm as silica fine particles in the hard coat layer forming composition. An optical laminate was obtained in the same manner as in Example 1 except that the composition for forming a hard coat layer was mixed so as to contain 25 parts by weight and the obtained composition for forming a hard coat layer was coated on a transparent substrate film.

<Summary of results>
The optical laminates obtained in the above examples and comparative examples were evaluated by the above evaluation methods. The evaluation results are shown in Table 2.

The optical laminates of the present invention obtained in Examples 1 to 6 had no interference fringes, and the hard coat layer surface had sufficient hardness and adhesion.
On the other hand, the optical laminates obtained in Comparative Examples 1 to 3 having a colloidal silica content less than that of the present invention as a material for the hard coat layer had no interference fringes and sufficient adhesion, but had insufficient hardness. It was enough. In particular, the optical layered body of Comparative Example 2 in which the content of urethane acrylate in the hard coat layer was less than the preferred range had low hardness on the surface of the hard coat layer.

  Further, the optical laminates obtained in Comparative Examples 4 and 5 in which the average particle size of colloidal silica as the material of the hard coat layer exceeded the range of the present invention had no interference fringes and sufficient adhesion, The hardness of the layer surface was insufficient.

Further, the optical laminates obtained in Comparative Examples 6 and 7 in which the content of colloidal silica exceeded the present invention had no interference fringes and had sufficient hardness on the surface of the hard coat layer, but the adhesion was insufficient. .
In addition, the optical laminate obtained in Comparative Example 8 in which the hard coat layer was directly laminated on the transparent base material without using a thin layer had sufficient hardness and adhesion on the surface of the hard coat layer. There has occurred.

It is a figure which shows the basic layer structure of the optical laminated body which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical laminated body 2 Light transmissive base material 3 Thin layer 4 Hard-coat layer

Claims (7)

On the cellulose triacetate substrate , a coating film of a composition for forming a thin layer containing a resin (A) having a weight average molecular weight of 200 or more and 1000 or less and having two or more (meth) acryl groups is formed. A thin layer formed by curing with ultraviolet rays or ionizing radiation , and an ionizing radiation containing a prepolymer, an oligomer and / or a monomer having a polymerizable unsaturated bond or an epoxy group in the molecule at least on the thin layer. Forming a coating film of a composition for forming a hard coat layer containing a resin (B) that is a curable composition and silica fine particles having an average particle size of 10 to 40 nm, and cured by ultraviolet rays or ionizing radiation, An optical laminate for an image display device , comprising at least a hard coat layer containing 20 to 60 parts by weight of silica fine particles based on 100 parts by weight of the resin (B). The resin (B) is a condensation product of unsaturated dicarboxylic acid and polyhydric alcohol, polyester (meth) acrylate, epoxy (meth) acrylate, urethane (meth) acrylate, polyether (meth) acrylate, polyol (meth) acrylate, The optical laminated body of Claim 1 containing 1 type, or 2 or more types selected from the group which consists of a melamine (meth) acrylate and a cationic polymerization type epoxy compound. The optical laminate according to claim 2, wherein the resin (B) contains at least 30 to 70% by weight of urethane (meth) acrylate. The resin (A) is ethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth). ) Acrylate, triethylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, isocyanuric acid EO (ethylene oxide) modified di (Meth) acrylate, bisphenol FEO (ethylene oxide) modified di (meth) acrylate, bisphenol AEO (ethylene oxide) modified di (meth) acrylate, 3-methylpentanediol di (meta) One or a mixture of two or more selected from the group consisting of acrylate, poly 1,2-butadiene di (meth) acrylate, diethylene glycol bis β-acryloyloxypropionate, hydroxypivalate ester neopentyl glycol di (meth) acrylate The optical laminated body according to any one of claims 1 to 3.   The optical laminate according to any one of claims 1 to 4, wherein the hard coat layer comprises an antistatic agent and / or an antiglare agent.   The optical laminate according to any one of claims 1 to 5, wherein an antistatic layer, an antiglare layer, a low refractive index layer, or two or more of these layers are formed on the hard coat layer.   The optical laminate according to any one of claims 1 to 6, which is used as an antireflection laminate.

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