JP2007293229A - Optical laminate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical laminate which exhibits a high surface hardness, while effectively suppressing or preventing fringe patterns. <P>SOLUTION: On a light transmitting base material of the laminate, at least (1) a hard coat layer A adjacent to the base material and (2) a hard coat layer B as an outermost surface layer are formed. The optical laminate is characterized in that an interface between the base material and the hard coat layer A does not substantially exist. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a novel optical laminate.

  A plate-shaped transparent material such as glass or plastic is used in various display devices including a display of an electronic device such as a word processor, a computer, and a television. These transparent materials have a problem that transparency is easily lost due to adhesion of dust due to static electricity, adhesion of dirt, scratches, scratches, or the like.

  Therefore, a hard coat is formed on the transparent material, or another layer is formed on the hard coat to give a desired function (for example, antistatic property, antifouling property, antireflection property, etc.). Has been done.

  However, when a hard coat or the like is formed on the transparent substrate, the reflected light on the transparent substrate surface interferes with the reflected light on the hard coat surface, resulting in uneven patterns called interference fringes due to film thickness unevenness. This appears and the appearance is damaged.

In order to solve this problem, there is optically a method of extremely increasing the thickness of the hard coat layer or the like to several tens of μm or more, or a method of reducing the thickness to about 100 nm. However, the former lacks practicability for reasons such as cracking and cost. The latter has a problem that sufficient surface hardness cannot be secured.
JP2005-107005

  Accordingly, a main object of the present invention is to provide an optical laminate that can exhibit high surface hardness while effectively suppressing or preventing the occurrence of interference fringes.

  As a result of intensive studies in view of the problems of the prior art, the present inventor has found that the above object can be achieved by adopting a specific layer structure, and has completed the present invention.

That is, the present invention relates to the following optical laminate.
1. A laminate in which at least (1) a hard coat layer A adjacent to the substrate and (2) a hard coat layer B are formed on a light transmissive substrate, the substrate and the hard coat layer A An optical laminated body characterized by substantially not having an interface with.
2. Item 2. The optical laminate according to Item 1, wherein the hard coat layer B is formed using a composition B containing a urethane (meth) acrylate-based compound having 6 or more functional groups.
3. Item 3. The optical laminate according to Item 2, wherein the urethane (meth) acrylate compound has a weight average molecular weight of 1,000 to 50,000.
4). Item 4. The optical component according to any one of Items 1 to 3, wherein the hard coat layer A is formed using a composition A having a weight average molecular weight of 200 or more and containing a compound A having three or more functional groups. Laminated body.
5). Item 5. The optical laminate according to Item 4, wherein Compound A is at least one of a (meth) acrylate compound and a urethane (meth) acrylate compound.
6). Item 6. The optical laminate according to Item 4 or 5, wherein the composition A contains a solvent having permeability or solubility with respect to the substrate.
7). Item 7. The optical laminate according to any one of Items 1 to 6, wherein interference fringes are substantially absent.
8). Item 8. The optical laminate according to any one of Items 1 to 7, wherein the pencil hardness of the hard coat layer A and the hard coat layer B is 4H or more.
9. Item 8. The optical laminate according to any one of Items 1 to 7, wherein the hard coat layer A has a Vickers hardness of 450 N / mm or more, and the hard coat layer B has a Vickers hardness of 550 N / mm or more.
10. 1) Between hard coat layer A and hard coat layer B 2) Above hard coat layer B or 3) Below hard coat layer A, antistatic layer, antiglare layer, low refractive index layer, antifouling layer Or the optical laminated body in any one of said claim | item 1-9 formed by forming these 2 or more types of layers.
11. Item 11. The optical laminate according to any one of Items 1 to 10, which is used as an antireflection laminate.

  The optical layered body of the present invention can realize a state in which the interface between the base material and the hard coat layer A does not substantially exist by forming at least two specific hard coat layers. Thereby, generation | occurrence | production of an interference fringe can be suppressed thru | or prevented, and high surface hardness can be exhibited. Further, the laminate of the present invention can also effectively suppress curling during processing due to the above configuration.

  The optical laminate according to the present invention can be suitably used as a hard coat laminate, preferably as an antireflection laminate (including use as an antiglare 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 preferably used for the surface of displays such as CRT, LCD, PDP, ELD and the like.

  The optical laminate of the present invention is a laminate in which at least (1) a hard coat layer A adjacent to the substrate and (2) a hard coat layer B are formed on a light transmissive substrate, The interface between the base material and the hard coat layer A is substantially absent.

  In this specification, acrylate and methacrylate may be collectively referred to as (meth) acrylate.

  Hereinafter, each layer of the optical layered body of the present invention will be described. In the present invention, curable resin precursors such as monomers, oligomers, and prepolymers are collectively referred to as “resins” unless otherwise specified.

Light transmissive substrate The material of the light transmissive substrate may be any material that transmits light, and may be colorless and transparent or colored and transparent. Further, it may be translucent. As such a material, either an inorganic material or an organic material can be used. Examples of the inorganic material include glass. Organic materials include cellulose resins such as triacetate cellulose (TAC), diacetyl cellulose, acetate butyrate cellulose, polyethylene terephthalate (PET), polyether sulfone, acrylic resins, polyurethane resins, polycarbonates, polyethers Examples include ketone, meta (acrylonitrile), polysulfone, and polyether. Among these, cellulosic resins are preferable, and triacetate cellulose is more preferable.

  A commercial item can also be used for these materials. For example, as the polyester resin, product names “A-4100” and “A-4300” manufactured by Toyobo Co., Ltd. are preferable. Further, as the triacetate cellulose, product names “TF80UL”, “FT TDY80UL” manufactured by Fuji Photo Film Co., Ltd. and the like are preferable.

In addition, an amorphous olefin polymer (Cyclo-Olefin-Polymer: COP) film having an alicyclic structure can be used as the light-transmitting substrate. This is a base material mainly composed of a norbornene polymer, a monocyclic olefin polymer, a cyclic conjugated diene polymer, a vinyl alicyclic hydrocarbon polymer resin, etc. Can be used. Examples of commercially available products include “Zeonex” and “Zeonoa” (norbornene resin) manufactured by Nippon Zeon Co., Ltd., “Sumilite FS-1700” manufactured by Sumitomo Bakelite Co., Ltd.,
"Arton" (modified norbornene resin) manufactured by JSR Corporation, "Appel" (cyclic olefin copolymer) manufactured by Mitsui Chemicals, "Topas" (cyclic olefin copolymer) manufactured by Ticona, Hitachi Chemical ( "Optrez OZ-1000" series (alicyclic acrylic resin), etc. manufactured by KK As an alternative substrate for triacetylcellulose, FV series (low birefringence, low photoelastic modulus film) manufactured by Asahi Kasei Chemicals Corporation can also be suitably used.

  The thickness of the light-transmitting substrate is not limited, but generally it is preferably about 30 to 200 μm.

Hard coat layer The “hard coat layer” in the present invention refers to a layer having a hardness of “H” or higher in a pencil hardness test defined by JIS K5600-5-4 (1999).

  In the present invention, at least (1) a hard coat layer A adjacent to the substrate and (2) a hard coat layer B as the outermost surface layer are formed. The hard coat layer A can suppress or prevent the generation of interference fringes. Further, the hard coat layer A can effectively suppress curling of the laminate. The hard coat layer B can ensure a predetermined hardness. Thus, by using a layer structure having two hard coat layers, the problem of interference fringes and the problem of surface hardness can be solved all at once.

  The thickness of each hard coat layer can be appropriately set according to desired characteristics and the like, but it is usually desirable to form it so as to be 0.1 to 100 μm, particularly 0.8 to 20 μm.

  Each hard code layer is not limited as long as it has transparency. For example, a film can be formed by simply drying a solvent added to adjust the solid content during coating, such as a resin curable by ultraviolet rays or an electron beam (ionizing radiation curable resin) and a solvent-drying resin (thermoplastic resin). 1 type or 2 types or more, such as a resin that can be formed) and a thermosetting resin. As these resins themselves, known or commercially available resins can be used. In the present invention, it is preferable to use an ionizing radiation curable resin. Examples of the ionizing radiation curable resin include polyester resin, polyether resin, acrylic resin, epoxy resin, urethane resin, spiroacetal resin, polybutadiene resin, and polythiol polyene resin. These can be used alone or in combination of two or more.

  Each hard coat layer can be formed using, for example, a composition containing a raw material component (a composition for forming a hard coat layer). More specifically, a solution or dispersion obtained by dissolving or dispersing the raw material components and, if necessary, an additive in a solvent is used as a composition for forming a hard coat layer, and a coating film is formed using the composition. Each hard coat layer can be obtained by curing the coating film.

  The preparation method of the said composition should just be implemented according to a well-known method, if each component can be mixed uniformly. For example, it can mix using well-known apparatuses, such as a paint shaker, a bead mill, a kneader, and a mixer.

  The formation method of a coating film should just follow a well-known method. For example, various methods such as a spin coating method, a dip method, a spray method, a die coating method, a bar coating method, a roll coating method, a meniscus coating method, a flexographic printing method, a screen printing method, and a pea coating method are used. be able to.

  What is necessary is just to select the hardening method of the obtained coating film suitably according to the content etc. of the composition. For example, in the case of an ultraviolet curing type, the coating film may be cured by irradiating with ultraviolet rays.

  As the composition A or the composition B used for forming each hard coat layer A or hard coat layer B, what is used as a raw material component of the resin having transparency may be used, depending on the type of the resin and the like. Can be set. For example, monofunctional monomers such as ethyl (meth) acrylate, ethylhexyl (meth) acrylate, styrene, methylstyrene, N-vinylpyrrolidone; urethane (meth) acrylate, polyester (meth) acrylate, polymethylolpropane tri (meth) Acrylate, hexanediol (meth) acrylate, polyethylene glycol di (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, isocyanuric acid-modified di (or tri) acrylate, etc. One or more species of sexual Nomar like.

  In the present invention, among these, ethyl (meth) acrylate, ethylhexyl (meth) acrylate, urethane (meth) acrylate, polyester (meth) acrylate, polymethylolpropane tri (meth) acrylate, hexanediol (meth) acrylate, Polyethylene glycol di (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) ) At least one (meth) acrylate compound such as acrylate can be suitably used. That is, at least one of an acrylate compound and / or a methacrylate compound can be suitably used.

  In the composition A or the composition B, a solvent can be used as necessary. As a solvent, it can select suitably from well-known solvents according to the kind etc. of the raw material component to be used. For example, alcohols such as methanol, ethanol, isopropyl alcohol, butanol, isobutyl alcohol, methyl glycol, methyl glycol acetate, methyl cellosolve, ethyl cellosolve, butyl cellosolve; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, diacetone alcohol Esters such as methyl formate, methyl acetate, ethyl acetate, ethyl lactate and butyl acetate; nitrogen-containing compounds such as nitromethane, N-methylpyrrolidone and N, N-dimethylformamide; ethers such as diisopropyl ether, tetrahydrofuran, dioxane and dioxolane Class: Halogenated hydrocarbons such as methylene chloride, chloroform, trichloroethane, tetrachloroethane; dimethyl sulfoxide, carbonic acid Other things, such as propylene, or a mixture of two or more thereof. More preferable solvents include at least one of methyl acetate, ethyl acetate, butyl acetate, methyl ethyl ketone, and the like.

  In particular, as the solvent used in the composition A, a solvent having permeability to the light-transmitting substrate to be used (a material capable of swelling and dissolving the substrate material) can be preferably used. For example, when a cellulose resin is used as the light transmissive substrate, methyl ethyl ketone or the like can be preferably used.

When using a solvent in the composition A or the composition B, the amount of the solvent used may be appropriately set so that the solid content of each composition is about 5 to 80% by weight.
(Hard coat layer A)
In particular, as the composition A for forming the hard coat layer A, a composition (mixture) containing a compound (compound A) having a weight average molecular weight of 200 or more and having three or more functional groups as a raw material component. Is preferably used. By using such a compound A, generation of interference fringes can be effectively suppressed.

  The weight average molecular weight is usually 200 or more, preferably 250 or more, more preferably 300 or more, and most preferably 350 or more. The upper limit of the weight average molecular weight is not limited, but is usually about 40,000. The number of the functional groups is generally 3 or more, preferably more than 3, more preferably 4 or more, and most preferably 5 or more. Although the upper limit of the number of the functional groups is not limited, it is usually about 15.

  Although the said compound A should just have said weight average molecular weight and functional group number, as above-mentioned, it is preferable to use at least 1 sort (s) of a (meth) acrylate type compound and a urethane (meth) acrylate type compound suitably. it can. For example, at least one of polyester (meth) acrylate, urethane acrylate, polyethylene glycol di (meth) acrylate having the above weight average molecular weight and the number of functional groups can be preferably used. These may be known or commercially available.

The content ratio (solid content) of the compound A in the composition A is not limited, but is usually 50 to 100% by weight (particularly 90 to 100% by weight). As a component other than the compound A, a compound having a weight average molecular weight of less than 200 may be contained in addition to the polymerization initiator or the additives described later.
(Hard coat layer B)
In particular, the composition B for forming the hard coat layer B is a composition (mixture) containing a urethane (meth) acrylate compound having a functional group of 6 or more (preferably 6 or more and 15 or less) as a raw material component. It is desirable to use As the urethane (meth) acrylate compound, at least one urethane (meth) acrylate compound having a weight average molecular weight of 1000 to 50000 (preferably 1500 to 40000) can be suitably used.

  In the present invention, in addition to the urethane (meth) acrylate compound, a (meth) acrylate compound having a functional group of 3 or more and 6 or less (excluding the urethane (meth) acrylate compound) is also used. You can also As said (meth) acrylate type compound, at least 1 sort (s), such as a dipentaerythritol hexa (meth) acrylate and a pentaerythritol tri (meth) acrylate, can be used conveniently, for example.

  Although the total content (solid content) of the (meth) acrylate compound and the urethane (meth) acrylate compound in the composition B is not limited, it is usually 10 to 100% by weight (particularly 20 to 100% by weight). What should I do? As components other than these compounds, in addition to the additives described below, compounds having a functional group of less than 3 may be included.

  In addition, the ratio of the (meth) acrylate compound and the urethane (meth) acrylate compound is not limited, but usually a total of 100 of the (meth) acrylate compound and the urethane (meth) acrylate compound is 100. In the weight%, the (meth) acrylate compound is 0 to 90% by weight (especially 5 to 90% by weight), and the urethane (meth) acrylate compound is 100 to 10% by weight (particularly 10 to 95% by weight). It is desirable to do.

Other components In the present invention, the composition A or the composition B may contain additives such as a polymerization initiator, an antistatic agent, and an antiglare agent as necessary.

  As the polymerization initiator, it is preferable to use a photopolymerization initiator, particularly when the hard coat layer is formed of an ionizing radiation curable resin. Examples of the photopolymerization initiator include one or more of acetophenones, benzophenones, Michler benzoyl benzoate, α-amyloxime ester, tetramethylchuram monosulfide, and thioxanthones. In this case, it is preferable to mix and use a photosensitizer such as n-butylamine, triethylamine, poly-n-butylphosphine.

  Examples of the antistatic agent include various cationic compounds having cationic groups such as quaternary ammonium salts, pyridinium salts, and primary to tertiary amino groups; sulfonate groups, sulfate ester bases, phosphate ester bases, and phosphones. Anionic compounds having an anionic group such as acid bases; Amphoteric compounds such as amino acids and aminosulfate esters; Nonionic compounds such as amino alcohols, glycerins and polyethylene glycols; Organics such as tin and titanium alkoxides And metal chelate compounds such as metal compounds and acetylacetonate salts thereof. Furthermore, the compound which made high molecular weight said compound is mentioned. Also, a coupling agent having a tertiary amino group, a quaternary ammonium group or a metal chelate portion and having a monomer or oligomer that can be polymerized by ionizing radiation or a functional group that can be polymerized by ionizing radiation. Polymerizable compounds such as organometallic compounds can also be used as antistatic agents. These can be used by 1 type (s) or 2 or more types, and can also be used together with the following electroconductive ultrafine particle.

In the present invention, conductive ultrafine particles can also be used as an antistatic agent. Specific examples of the conductive fine particles include those made of a metal oxide. Examples of such metal oxides include ZnO (refractive index of 1.90 or less, the numerical value in parentheses represents the refractive index), CeO ₂ (1.95), Sb ₂ O ₂ (1.71), SnO _2. (1.997), indium tin oxide (1.95), In ₂ O ₃ (2.00), Al ₂ O ₃ (1.63), antimony-doped tin oxide (abbreviation; often abbreviated as ITO) ATO, 2.0), aluminum-doped zinc oxide (abbreviation: AZO, 2.0), and the like. In addition, carbon nanotubes, fullerene carbon materials, and the like can be given. Furthermore, a conductive polymer (organic polymer) can also be used. Specific examples include aliphatic conjugated polyacetylene, aromatic conjugated poly (paraphenylene), heterocyclic conjugated polypyrrole, polythiophene, heteroatom-containing polyaniline, and mixed conjugated poly (phenylene). Vinylene) and the like. In addition to these, a double-chain conjugated system that is a conjugated system having a plurality of conjugated chains in the molecule, a conductive complex that is a polymer obtained by grafting or block copolymerizing the conjugated polymer chain to a saturated polymer, etc. Can be mentioned.

  The fine particles preferably have a so-called sub-micron size of 1 micron or less, and fine particles having an average particle size of 0.1 nm to 0.1 μm are particularly preferable.

  As the antiglare agent, for example, various fine particles can be used. The shape may be any of a true sphere, an ellipse, etc., preferably a true sphere. The fine particles include inorganic or organic particles. The fine particles exhibit anti-glare properties and are preferably transparent. Specific examples of the fine particles include silica beads for inorganic materials and plastic beads for organic materials. Specific examples of plastic beads include styrene beads (refractive index 1.60), melamine beads (refractive index 1.57), acrylic beads (refractive index 1.49), acrylic-styrene beads (refractive index 1.54), 1 type (s) or 2 or more types, such as a polycarbonate bead and a polyethylene bead, can be used.

  In this case, it is preferable to use an anti-settling agent in combination. This is because by adding an anti-settling agent, precipitation of the resin beads can be suppressed and the resin beads can be uniformly dispersed in the solvent. Specific examples of the anti-settling agent include silica beads having a particle size of 0.5 μm or less, preferably about 0.1 to 0.25 μm.

Other Layers As a basic layer structure of the present invention, it is sufficient that at least the hard coat layer A and the hard coat layer B are formed on the light-transmitting substrate. For example, a three-layer structure in which the hard coat layer A is formed adjacent to the light-transmitting substrate and the hard coat layer B is formed adjacent to the hard coat layer A can be mentioned. In this case, 1) between the hard coat layer A and the hard coat layer B, 2) on the hard coat layer B, or 3) hard as long as the light transmission property of the laminate of the present invention is not impaired. Under the coating layer A, one or two or more other layers (antistatic layer, antiglare layer, low refractive index layer, antifouling layer, adhesive layer, other hard coat layer, etc.) are appropriately formed. Can do. These layers may be the same as those of a known antireflection laminate.

(Antistatic layer)
The antistatic layer can be formed of a composition containing an antistatic agent and a resin. In this case, a solvent can also be used. As the antistatic agent and the solvent, those described in the section of the hard coat layer can be used. The thickness of the antistatic layer is not limited, but is preferably about 10 nm to 1 μm.

  As the resin, for example, 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. Among these, a thermosetting resin, an ionizing radiation curable resin, or an ionizing radiation curable compound is preferable. In particular, it is most preferable to use an ionizing radiation curable resin and / or an ionizing radiation curable compound. Further, the thermoplastic resin is particularly preferable when a conductive organic polymer is used.

  The ionizing radiation curable compound can be used as an ionizing radiation curable composition containing the ionizing radiation curable compound. As the ionizing radiation curable compound, at least one of monomers, oligomers and prepolymers having a polymerizable unsaturated bond or an epoxy group in the molecule can be used. 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 the prepolymer or oligomer in the ionizing radiation curable composition include unsaturated polyesters such as a condensate of unsaturated dicarboxylic acid and polyhydric alcohol; methacrylates such as polyester methacrylate, polyether methacrylate, polyol methacrylate, and melamine methacrylate. In addition to acrylates such as polyester acrylate, epoxy acrylate, urethane acrylate, polyether acrylate, polyol acrylate, and melamine acrylate, cationically polymerizable epoxy compounds and the like. These can be used alone or in combination of two or more.

  Examples of the monomer in the ionizing radiation curable composition include styrene monomers such as styrene and α-methylstyrene; methyl acrylate, acrylic acid-2-ethylhexyl, methoxyethyl acrylate, butoxyethyl acrylate, acrylic acid Acrylic esters such as butyl, methoxybutyl acrylate and phenyl acrylate; methacrylic acid such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, methoxyethyl methacrylate, ethoxymethyl methacrylate, phenyl methacrylate, lauryl methacrylate Esters: 2- (N, N-diethylamino) ethyl acrylate, 2- (N, N-dimethylamino) ethyl acrylate, 2- (N, N-dibenzylamino) methyl acrylate, acrylic acid -2- (N, N-diethyl Mino) Unsaturated substituted amino alcohol esters such as propyl; Unsaturated carboxylic acid amides such as acrylamide and methacrylamide; ethylene glycol diacrylate, propylene glycol diacrylate, neopentyl glycol diacrylate, 1,6-hexanediol Diacrylate compounds such as diacrylate and triethylene glycol diacrylate; polyfunctional compounds such as dipropylene glycol diacrylate, ethylene glycol ditalylate, propylene glycol dimethacrylate, and diethylene glycol dimethacrylate, and / or two or more in the molecule Polythiol compounds having a thiol group (for example, trimethylolpropane trithioglycolate, trimethylolpropane trithiopropylate, pen Taerythritol tetrathioglycolate etc.).

  Usually, as the monomer in the ionizing radiation curable composition, one or two or more of the above-mentioned compounds are mixed and used as necessary. However, in order to give ordinary application suitability to the ionizing radiation curable composition, The monomer 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 for the antistatic layer, it is desirable to reduce the amount of monomer or use an acrylate monomer having 1 or 2 functional groups. When the antistatic layer is required to have wear resistance, heat resistance, solvent resistance, etc., for example, it is preferable to use an acrylate monomer having three or more functional groups. Here, 2-hydroxy acrylate, 2-hexyl acrylate, phenoxyethyl acrylate, etc. are mentioned as those having 1 functional group. Examples of those having 2 functional groups include ethylene glycol diacrylate and 1,6-hexanediol diacrylate. Examples of those having 3 or more functional groups include trimethylolpropane triacrylate, Penque, lithitol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, and the like.

  In order to adjust physical properties such as flexibility and surface hardness of the antistatic layer, a resin that is not cured by irradiation with ionizing radiation can be added to the ionizing radiation curable composition as necessary. Examples of the resin include one or more thermoplastic resins such as polyurethane resin, cellulose resin, polyvinyl butyral resin, polyester resin, acrylic resin, polyvinyl chloride resin, and polyvinyl acetate. Among these, at least one of polyurethane resin, cellulose resin, polyvinyl butyral resin, and the like is preferable from the viewpoint of improving flexibility. When the ionizing radiation curable composition is cured by ultraviolet irradiation, a photopolymerization initiator or a photopolymerization accelerator may be added. In the case of a resin system having a radically polymerizable unsaturated group as the photopolymerization initiator, for example, acetophenones, benzophenones, thioxanthones, benzoin, benzoin methyl ether or the like can be used alone or in combination. In the case of a resin system having a cationically polymerizable functional group, as a photopolymerization initiator, for example, aromatic diazonium salt, aromatic sulfonium salt, aromatic iodonium salt, metallocene compound, benzoin sulfonate ester or the like The above can be used. The addition amount of the photopolymerization initiator may be appropriately set according to the type of the photopolymerization initiator to be used, but if it is about 0.1 to 10 parts by weight with respect to 100 parts by weight of the ionizing radiation curable composition. good.

  A reactive organosilicon compound can be used in combination with the ionizing radiation curable composition as necessary. For example, the general formula RmSi (OR ′) n (wherein R and R ′ are the same or different from each other and represent an alkyl group having 1 to 10 carbon atoms. M and n each satisfy the relationship of m + n = 4. A compound represented by the following formula can be used.

  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, methyldimethoxysilane, methyldi Tokishishiran, at least one such hexyl trimethoxysilane to.

  In this case, as the organosilicon compound that can be used in combination with the ionizing radiation curable composition, a silane coupling agent can be used together as necessary. Specific examples of the silane coupling agent include γ- (2-aminoethyl) aminopropyltrimethoxysilane, γ- (2-aminoethyl) aminopropylmethyldimethoxysilane, and β- (3,4-epoxycyclohexyl). ) Ethyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-methacryloxypropylmethoxysilane, N-β- (N-vinylbenzylaminoethyl) -γ-aminopropylmethoxysilane hydrochloride, γ-glycidoxy Propyltrimethoxysilane, aminosilane, methylmethoxysilane, vinyltriacetoxysilane, γ-mercaptopropyltrimethoxysilane, γ-chloropropyltrimethoxysilane, hexamethyldisilazane, vinyltris (β-methoxyethoxy) silane, octadecyldimethyl [3 − ( Trimethoxysilyl) propyl] ammonium chloride, methyltrichlorosilane, dimethyldichlorosilane and the like.

(Anti-glare layer)
The antiglare layer may be formed, for example, between a transparent substrate and a hard coat layer or a low refractive index layer (described later). The antiglare layer may be formed from a resin composition containing a resin and an antiglare agent.

  As said resin, it can select from what was demonstrated in the term of the hard-coat layer suitably, and can be used.

  Various fine particles can be used as the antiglare agent. The average particle size of the fine particles is not limited, but generally may be about 0.01 to 20 μm. Further, the shape of the fine particles may be any of a true sphere, an ellipse, etc., preferably a true sphere. The fine particles may be inorganic or organic.

  The fine particles exhibit anti-glare properties and are preferably transparent. Specific examples of the fine particles include silica beads for inorganic materials and plastic beads for organic materials. Specific examples of plastic beads include styrene beads (refractive index 1.60), 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 fine particles have an average particle size of R (μm), a ten-point average roughness of the antiglare layer unevenness is Rz (μm), an average unevenness interval of the antiglare layer is Sm (μm), and an average of the uneven portions. When the inclination angle is θa (degrees), the following formula:
30 ≦ Sm ≦ 600
0.05 ≦ Rz ≦ 1.60
0.1 ≦ θa ≦ 2.5
0.3 ≦ R ≦ 20
Those satisfying all of these are preferable.

  Sm (μm) represents the average interval of the irregularities of the antiglare layer, θa (degree) represents the average inclination angle of the irregularities, and (Rz) represents the 10-point average roughness. Yes, and its definition corresponds to the surface roughness measuring instrument: SE-3400 / Kosaka Laboratory Co., Ltd. instruction manual (revised 1995.07.20).

θa is a unit of angle, and when Δa is the slope expressed as an aspect ratio,
Δa = tan θa = (the sum of the difference between the minimum and maximum portions of each unevenness (corresponding to the height of each protrusion) / reference length). The reference length corresponds to the cut-off value λc of the roughness curve and the evaluation length that is actually touched by the measuring instrument SE-3400.

  According to another preferred embodiment of the present invention, when the refractive indexes of the fine particles and the resin composition are n1 and n2, respectively, Δn = | n1−n2 | <0.15 is satisfied, and An antiglare layer having a haze value of 55% or less inside the antiglare layer is preferred.

  The addition amount of the fine particles depends on the kind of fine particles to be used, desired antiglare property, etc., but is usually 2 to 30 parts by weight, preferably about 10 to 25 parts by weight with respect to 100 parts by weight of the resin composition. .

  An antisettling agent may be added when preparing the composition for the antiglare layer. This is because by adding an anti-settling agent, precipitation of the resin beads can be suppressed and the resin beads can be uniformly dispersed in the solvent. As a specific example of the anti-settling agent, beads such as silica beads can be used. The average particle size of the beads is not limited, but is generally 0.5 μm or less, preferably 0.1 to 0.25 μm.

  The film thickness (when cured) of the antiglare layer is generally about 0.1 to 100 μm, particularly preferably in the range of 0.8 to 10 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 a layer that plays a role of reducing the reflectance when external light (for example, fluorescent tower, natural light, etc.) is reflected on the surface of the optical laminate. The low refractive index layer is preferably 1) a resin containing silica or magnesium fluoride, 2) a fluorine resin which is a low refractive index resin, 3) a fluorine resin containing silica or magnesium fluoride, and 4) silica. Alternatively, either a magnesium fluoride thin film or the like is configured. For resins other than fluororesins, the same resins as those constituting the antistatic layer can be used.

  These low refractive index layers preferably have a refractive index of 1.45 or less, particularly 1.42 or less.

  Further, the thickness of the low refractive index layer is not limited, but it may be set appropriately from the range of about 30 nm to 1 μm.

  As the fluororesin, a polymerizable compound containing a fluorine atom in at least a molecule or a polymer thereof can be used. The polymerizable compound is not particularly limited, but for example, those having a curing reactive group such as a functional group that is cured by ionizing radiation and a polar group that is thermally cured are preferable. Moreover, the compound which has these reactive groups simultaneously may be sufficient. In contrast to this polymerizable compound, a polymer has no reactive groups as described above.

  As the polymerizable compound having an ionizing radiation curable group, fluorine-containing monomers having an ethylenically unsaturated bond can be widely used. More specifically, to illustrate fluoroolefins (eg, fluoroethylene, vinylidene fluoride, tetrafluoroethylene, hexafluoropropylene, perfluorobutadiene, perfluoro-2,2-dimethyl-1,3-dioxole, etc.) Can do. As having a (meth) acryloyloxy group, 2,2,2-trifluoroethyl (meth) acrylate, 2,2,3,3,3-pentafluoropropyl (meth) acrylate, 2- (perfluorobutyl) Ethyl (meth) acrylate, 2- (perfluorohexyl) ethyl (meth) acrylate, 2- (perfluorooctyl) ethyl (meth) acrylate, 2- (perfluorodecyl) ethyl (meth) acrylate, α-trifluoromethacryl (Meth) acrylate compounds having fluorine atoms in the molecule, such as methyl acrylate and ethyl α-trifluoromethacrylate; C 1-14 fluoroalkyl groups having at least 3 fluorine atoms in the molecule, fluorocyclo An alkyl group or a fluoroalkylene group and at least two (meta And fluorine-containing polyfunctional (meth) acrylic acid ester compounds having an acryloyloxy group.

  Preferable examples of the thermosetting polar group include hydrogen bond forming groups such as a hydroxyl group, a carboxyl group, an amino group, and an epoxy group. These are excellent not only in adhesion to the coating film but also in affinity with inorganic ultrafine particles such as silica. Examples of the polysynthetic compound having a thermosetting polar group include 4-fluoroethylene-perfluoroalkyl vinyl ether copolymer; fluoroethylene-hydrocarbon vinyl ether copolymer; epoxy, polyurethane, cellulose, phenol, polyimide, etc. Fluorine modified products of each resin can be mentioned.

  Polymerizable compounds having both ionizing radiation curable groups and thermosetting polar groups include acrylic or methacrylic acid moieties and fully fluorinated alkyl, alkenyl, aryl esters, fully or partially fluorinated vinyl ethers, fully or partially fluorine. Illustrative examples include fluorinated vinyl esters, fully or partially fluorinated vinyl ketones, and the like.

Moreover, as a fluoropolymer, the following can be mentioned, for example.
Polymer of monomer or monomer mixture containing at least one fluorine-containing (meth) acrylate compound of a polymerizable compound having an ionizing radiation curable group; at least one of the fluorine-containing (meth) acrylate compound and methyl (meth) Copolymers with (meth) acrylate compounds containing no fluorine atom in the molecule such as acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate; fluoroethylene , Fluorine-containing compounds such as vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, 3,3,3-trifluoropropylene, 1,1,2-trichloro-3,3,3-trifluoropropylene, hexafluoropropylene Monomer homopolymer or Copolymer such as. Silicone-containing vinylidene fluoride copolymers obtained by adding a silicone component to these copolymers can also be used. The silicone component in this case includes (poly) dimethylsiloxane, (poly) diethylsiloxane, (poly) diphenylsiloxane, (poly) methylphenylsiloxane, alkyl-modified (poly) dimethylsiloxane, azo group-containing (poly) dimethylsiloxane, Dimethyl silicone, phenylmethyl silicone, alkyl aralkyl modified silicone, fluorosilicone, polyether modified silicone, fatty acid ester modified silicone, methyl hydrogen silicone, silanol group containing silicone, alkoxy group containing silicone, phenol group containing silicone, methacryl modified silicone, acrylic Modified silicone, amino modified silicone, carboxylic acid modified silicone, carbinol modified silicone, epoxy modified silicone, mercapto modified silicone Over emissions, fluorine-modified silicones, polyether-modified silicone and the like. Among them, those having a dimethylsiloxane structure are preferable.

  Furthermore, non-polymers or polymers composed of the following compounds can also be used as the fluororesin. That is, a fluorine-containing compound having at least one isocyanato group in the molecule is reacted with a compound having at least one functional group in the molecule that reacts with an isocyanato group such as an amino group, a hydroxyl group, or a carboxyl group. Compound obtained: a compound obtained by reacting a fluorine-containing polyol such as fluorine-containing polyether polyol, fluorine-containing alkyl polyol, fluorine-containing polyester polyol, fluorine-containing ε-caprolactone modified polyol with a compound having an isocyanato group Can be used.

  Further, together with the above-described polysynthetic compound or polymer having a fluorine atom, each resin component as described in the hard coat layer can be mixed and used. Furthermore, various additives and solvents can be used as appropriate in order to improve the curing agent for curing reactive groups and the like, to improve the coating property, and to impart antifouling properties.

In addition, the low refractive index layer can also be configured by a thin film made of SiO ₂ . For example, it may be formed by any one of a vapor phase method such as an evaporation method, a sputtering method, a plasma CVD method, a liquid phase method for forming a SiO ₂ gel film from a sol solution containing a SiO ₂ sol. Furthermore, in addition to SiO ₂ , a material such as a thin film of MgF ₂ can constitute the low refractive index layer. In particular, a SiO ₂ thin film is preferable because it has high adhesion to the lower layer. Further, among the above methods, when the plasma CVD method is used, it is preferable to use an organic siloxane as a raw material gas under a condition in which no other inorganic vapor deposition source exists. In this case, it is preferable that the deposition target is maintained as low as possible.

  According to a preferred embodiment of the present invention, it is preferable to use “fine particles having voids”. By using “fine particles having voids”, the refractive index can be lowered while maintaining the layer strength of the low refractive index layer. In the present invention, “fine particles having voids” are structures in which fine particles are filled with gas and / or a porous structure containing gas. This is because the refractive index decreases as the gas occupancy in the fine particles increases compared to the original refractive index of the fine particles without voids. The present invention also includes fine particles capable of forming a nanoporous structure inside and / or at least part of the surface depending on the form, structure, aggregation state, and dispersion state of the fine particles inside the coating film. .

  As a specific example of the inorganic fine particles having voids, silica fine particles prepared by using the technique disclosed in Japanese Patent Application Laid-Open No. 2001-233611 are preferable. In addition, silica fine particles obtained by the production methods described in JP-A-7-133105, JP-A-2002-79616, JP-A-2006-106714, and the like may be used. Since silica fine particles having voids are easy to manufacture and have high hardness, when a low refractive index layer is formed by mixing with a binder, the layer strength is improved and the refractive index is 1.20-1. It is possible to prepare within the range of about 45. In particular, as a specific example of the organic fine particles having voids, hollow polymer fine particles prepared using a technique disclosed in JP-A-2002-80503 are preferable.

  In addition to the silica fine particles, the fine particles capable of forming a nanoporous structure inside and / or at least a part of the surface of the coating film are manufactured for the purpose of increasing the specific surface area. For example, a controlled release material that adsorbs various chemical substances to the mass part, a porous fine particle used for catalyst fixation, or a dispersion or agglomerate of hollow fine particles intended to be incorporated into a heat insulating material or a low dielectric material Can do. Specifically, as a commercial product, for example, aggregates of porous silica fine particles from the product names “Nipsil” and “Nipgel” manufactured by Nippon Silica Industry Co., Ltd., silica fine particles manufactured by Nissan Chemical Industries, Ltd. From the colloidal silica UP series (trade name) having a structure in which are connected in a chain, those within the preferred particle diameter range of the present invention can be used.

  The average particle diameter of the “fine particles having voids” is 5 nm or more and 300 nm or less, preferably the lower limit is 8 nm or more and the upper limit is 100 nm or less, more preferably the lower limit is 10 nm or more and the upper limit is 80 nm or less. When the average particle diameter of the fine particles is within this range, excellent transparency can be imparted to the low refractive index layer.

(Anti-fouling layer)
The antifouling layer is a layer that plays a role of preventing dirt (fingerprints, water-based or oily inks, pencils, etc.) from adhering to the outermost surface of the optical layered body or being able to wipe off easily even when adhering. . According to a preferred embodiment of the present invention, an antifouling layer may be provided for the purpose of preventing the outermost surface of the low refractive index layer from being stained, and in particular, one surface of the light-transmitting substrate on which the low refractive index layer is formed; It is preferable to provide an antifouling layer on both opposite sides. By forming the antifouling layer, it becomes possible to further improve the antifouling property and the scratch resistance with respect to the optical laminate (antireflection laminate). Even when there is no low refractive index layer, an antifouling layer may be provided for the purpose of preventing contamination on the outermost surface.

  In general, the antifouling layer can be formed of a composition containing an antifouling layer agent and a resin. Specific examples of the antifouling layer agent include fluorine compounds that have low compatibility with ionizing radiation curable resin compositions having fluorine atoms in the molecule and are difficult to add to the low refractive index layer, and Examples thereof include a silicon compound, an ionizing radiation curable resin composition having a fluorine atom in the molecule, and a fluorine compound and / or a silicon compound having compatibility with fine particles. These may be known or commercially available.

  The antifouling layer can be formed on the hard coat layer B, for example. In particular, it is desirable that the antifouling layer be formed to be the outermost surface. The antifouling layer can be replaced, for example, by imparting antifouling performance to the hard coat layer B itself.

It is desirable that the optical laminate of the present invention has substantially no interface, such as an interface in the optical laminate. Here, “the interface is (substantially) nonexistent” means that 1) the two layer surfaces overlap each other but there is actually no interface, and 2) there is an interface on both surfaces in terms of the refractive index. It is included that it is determined not to.

  As a specific criterion of “the interface is (substantially) absent”, it is based on observation of interference fringes of the optical laminate. That is, a black tape is attached to the back surface of the optical laminate, and the optical laminate is visually observed from above under irradiation of a three-wavelength fluorescent lamp. At this time, when interference fringes can be confirmed, the interface is confirmed by separately observing the cross section with a laser microscope, and this is recognized as “the interface exists”. On the other hand, when the interference fringes cannot be confirmed or extremely weak, when the cross section is separately observed with a laser microscope, the interface cannot be seen or can only be seen very thin. "No." The laser microscope can read the reflected light from each interface and observe the cross section nondestructively. This is observed as an interface only when each layer has a refractive index difference. Therefore, when the interface is not observed, it can be considered that there is no difference in refractive index and there is no interface.

  Moreover, it is preferable that the optical layered body of the present invention has substantially no interface. It is desirable that at least interference fringes are not visually recognized.

  In the optical layered body of the present invention, both the hard coat layers A and B can achieve a predetermined hardness. In this case, it is desirable that the hard coat layer A has a pencil hardness of 4H or higher. The hard coat layer A preferably has a Vickers hardness of 450 N / mm or more. The hard coat layer B preferably has a pencil hardness of 4H or higher. The hard coat layer B preferably has a Vickers hardness of 550 N / mm or more.

  The features of the present invention will be described more specifically with reference to the following examples and comparative examples. However, the scope of the present invention is not limited to the examples.

<Production Example 1>
As the composition for forming the hard coat layer A, the following compositions A to G were prepared.

Composition A
Polyester acrylate (manufactured by Toagosei; M9050, trifunctional, molecular weight 418): 10 parts by weight Polymerization initiator (manufactured by Ciba Specialty Chemicals; IRGACURE 184): 0.4 parts by weight Methyl ethyl ketone (hereinafter referred to as “MEK”) ): 10 parts by weight

Composition B
Polyester acrylate (manufactured by Toagosei Co., Ltd .; M9050, trifunctional, molecular weight 418): 5 parts by weight
-Urethane acrylate (manufactured by Nippon Kayaku Co., Ltd .; DPHA 40H, 10 functional, molecular weight of about 7000): 5 parts by weight-Polymerization initiator (manufactured by Ciba Specialty Chemicals; IRGACURE 184): 0.4 parts by weight-MEK: 10 parts by weight

Composition C
Polyethylene glycol diacrylate (manufactured by Toagosei; M240, bifunctional, molecular weight 302): 2 parts by weight Urethane acrylate (manufactured by Nippon Kayaku Co., Ltd .; DPHA 40H, 10 functional, molecular weight of about 7000): 6 parts by weight Urethane acrylate ( Arakawa Chemical Co., Ltd .; BS371, 10 or more functional, molecular weight of about 40,000): 2 parts by weight Polymerization initiator (Ciba Specialty Chemicals; IRGACURE 184): 0.4 parts by weight MEK: 10 parts by weight

Composition D
Polyethylene glycol diacrylate (manufactured by Toagosei; M240, bifunctional, molecular weight 302): 10 parts by weight Polymerization initiator (manufactured by Ciba Specialty Chemicals; IRGACURE 184): 0.4 parts by weight MEK: 10 parts by weight

Composition E
・ Urethane acrylate (manufactured by Nippon Gosei Co., Ltd .; purple light UV3520-TL, bifunctional, molecular weight 14000): 10 parts by weight ・ Polymerization initiator (manufactured by Ciba Specialty Chemicals; IRGACURE 184): 0.4 parts by weight ・ MEK: 10 parts by weight

Composition F
-Urethane acrylate (Nippon Gosei Co., Ltd .; purple light UV1700B, 10 functional, molecular weight 2000): 10 parts by weight-Polymerization initiator (Ciba Specialty Chemicals; IRGACURE 184): 0.4 parts by weight-MEK: 10 parts by weight

Composition G
Polyester acrylate (manufactured by Toagosei; M9050, trifunctional, molecular weight 418): 10 parts by weight Polymerization initiator (Ciba Specialty Chemicals; IRGACURE 184): 0.4 parts by weight Toluene: 10 parts by weight

<Production Example 2>
As the composition for forming hard coat B, the following composition a to composition e and composition a ′ were prepared.

Composition a
Dipentaerythritol hexaacrylate (DPHA, Nippon Kayaku Co., Ltd., 6 functional, molecular weight 547): 5 parts by weight Urethane acrylate (manufactured by Arakawa Chemical Co., Ltd .: BS371, 10 functional or higher, molecular weight about 40,000): 5 parts by weight Polymerization Initiator (Ciba Specialty Chemicals; IRGACURE 184): 0.4 parts by weight MEK: 10 parts by weight

Composition b
Pentaerythritol triacrylate (Nippon Kayaku Co., Ltd., PET 30, trifunctional, molecular weight 298): 5 parts by weight Urethane acrylate (Negami Kogyo Co., Ltd .; HDP, 10 functional, molecular weight 4500): 5 parts by weight Polymerization initiator (Ciba・ Specialty Chemicals; IRGACURE 184): 0.4 parts by weight ・ MEK: 10 parts by weight

Composition c
-Urethane acrylate (manufactured by Nippon Gosei Co., Ltd .; purple light UV 1700B, 10 functional, molecular weight 2000): 10 parts by weight-Polymerization initiator (manufactured by Ciba Specialty Chemicals; IRGACURE 184): 0.4 parts by weight

Composition d
Isocyanuric acid EO-modified diacrylate (manufactured by Toagosei Co., Ltd .; M215, bifunctional, molecular weight 369): 10 parts by weight
・ Polymerization initiator (Ciba Specialty Chemicals; IRGACURE 184): 0.4 parts by weight

Composition e
Dipentaerythritol hexaacrylate (Nippon Kayaku DPHA, 6 functional, molecular weight 547): 10 parts by weight Polymerization initiator (Ciba Specialty Chemicals; IRGACURE 184): 0.4 parts by weight

Composition a '
Dipentaerythritol hexaacrylate (DPHA, Nippon Kayaku Co., Ltd., 6 functional, molecular weight 547): 5 parts by weight Urethane acrylate (manufactured by Arakawa Chemical Co., Ltd .; BS371, 10 functional or higher, molecular weight of about 40,000): 5 parts by weight Fouling agent (Nippon Kayaku Co., Ltd. UT3971): 0.5 parts by weight Polymerization initiator (Ciba Specialty Chemicals; IRGACURE 184): 0.4 parts by weight MEK: 10 parts by weight

<Example 1>
The lower layer hard coat (composition A) resin was applied to one side of a cellulose triacetate film (thickness 80 μm) at a wet weight of 26 g / m ² (dry weight 13 g / m ² ). It dried at 70 degreeC for 60 ^second, and irradiated the ultraviolet-ray 50mJ / cm < ² >, and formed the hard-coat layer A for foundation | substrate. Further, on the hard coat layer A, an upper layer hard coat (composition a) resin was applied at a wet weight of 26 g / m ² (dry weight 13 g / m ² ). It dried at 70 degreeC for 60 second, the hard coat layer B was formed by irradiating ultraviolet-ray 200mJ / cm < ² >, and the target optical laminated body was obtained.

<Examples 2 to 9>
In the formation of the hard coat layer, Example 2 was performed in the same manner as in Example 1 except that each layer was formed as a combination of the resin compositions shown in Table 1 as the base hard coat layer A and the upper hard coat layer B. ˜9 optical laminates were obtained.

<Comparative Examples 1-6>
In the formation of the hard coat layer, Comparative Example 1 was performed in the same manner as in Example 1 except that each layer was formed as a combination of the resin compositions shown in Table 2 as the base hard coat layer A and the top hard coat layer B. The optical laminated body of -6 was obtained.

<Test Example 1>
About the optical laminated body obtained by each Example and the comparative example, it evaluated based on the following evaluation criteria. The results are shown in Tables 1 and 2.
(1) Interference fringe presence / absence test On the surface opposite to the hard coat layer of the optical laminate, a black tape for preventing back reflection is applied, and the optical laminate is visually observed from the surface of the hard coat layer. Evaluated.

Evaluation criteria Evaluation ○: No interference fringes were generated.

Evaluation x: Interference fringes were generated.
(2) Pencil hardness test Pencil hardness test; The hardness of the pencil scratch test was controlled for 2 hours under conditions of a temperature of 25 ° C. and a relative humidity of 60% on the prepared hard coat film (the optical laminate (hereinafter the same)). Then, it implemented by the load of 4.9N according to the pencil hardness evaluation method which JIS-K-5400 prescribed | regulated using the test pencil (hardness 4H) which JIS-S-6006 prescribed | regulates.

Evaluation criteria Evaluation ○: No scratch / number of measurements = 4/5, 5/5
Evaluation x: No scratch / number of measurements = 0/5, 1/5, 2/5, 3/5
(3) Curl test The prepared hard coat film was cut into a size of width x length = 10 cm x 10 cm, and measured to lift the four corners when left on a flat plate at a temperature of 20 ° C and a relative humidity of 60%. The average value was taken as the curl height.

Evaluation ○: 25 mm or less Evaluation ×: Larger than 26 mm (also marked as “X” when it is in a cylindrical shape and cannot be measured)
(4) Crack test The prepared hard coat film was cut into a size of 10 cm x 5 cm, wound around a cylindrical metal pipe with a diameter of 16 mm, and after winding, the film was returned to its original state and visually checked for cracks. It was confirmed.

Evaluation ○: No crack Evaluation ×: Crack present

  As is apparent from the results of Tables 1 and 2, it can be seen that in the present invention, a laminate having excellent hardness, crack resistance, etc. and no interference fringes can be obtained.

It is a figure which shows the layer structure (cross section) of the optical laminated body produced in the Example of this invention.

Claims (11)

A laminate in which at least (1) a hard coat layer A adjacent to the substrate and (2) a hard coat layer B are formed on a light transmissive substrate, the substrate and the hard coat layer A An optical laminated body characterized by substantially not having an interface with. The optical laminated body of Claim 1 formed by using the composition B in which the hard-coat layer B contains the urethane (meth) acrylate type compound which has a 6 or more functional group. The optical laminated body of Claim 2 whose said urethane (meth) acrylate type compound is the weight average molecular weight 1000-50000. The optical according to any one of claims 1 to 3, wherein the hard coat layer A is formed using a composition A having a weight average molecular weight of 200 or more and containing a compound A having three or more functional groups. Laminated body. The optical laminated body of Claim 4 whose compound A is at least 1 sort (s) of a (meth) acrylate type compound and a urethane (meth) acrylate type compound. The optical laminated body of Claim 4 or 5 in which the composition A contains the solvent which has a permeability or solubility with respect to the said base material. The optical laminate according to claim 1, wherein interference fringes are substantially absent. The optical laminate according to any one of claims 1 to 7, wherein the pencil hardness of the hard coat layer A and the hard coat layer B is 4H or more. The optical laminated body according to any one of claims 1 to 7, wherein the Vickers hardness of the hard coat layer A is 450 N / mm or more, and the Vickers hardness of the hard coat layer B is 550 N / mm or more. 1) Between hard coat layer A and hard coat layer B 2) Above hard coat layer B or 3) Below hard coat layer A, antistatic layer, antiglare layer, low refractive index layer, antifouling layer Or the optical laminated body in any one of Claims 1-9 formed by forming these 2 or more types of layers. The optical laminated body in any one of Claims 1-10 used as a laminated body for reflection prevention.

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