JP2010139591A - Anti-glare layer, anti-glare film and filter for display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anti-glare layer having excellent reflection preventive function and transparent image clearness and restraining glare, an anti-glare film using the anti-glare layer and a filter for a display using the anti-glare layer. <P>SOLUTION: In this anti-glare layer, spherical particulates (A) and elliptical particulates (B) are contained at a mixing proportion of 62:38 to 95:5 by mass ratio in resin, the mean particle diameter of the spherical particulates (A) is ≥0.1 μm and <10 μm, and the mean particle diameter of the elliptical particulates (B) is ≥0.1 μm and <15 μm. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides an antiglare layer that is excellent in anti-reflection and transmitted image clarity and suppresses the glare phenomenon of the screen, an antiglare film using the antiglare layer, and a display using the antiglare layer It relates to filters.

  In a display device such as a television or a personal computer monitor, external light such as sunlight or a fluorescent lamp is reflected and reflected on the surface, which makes it difficult to view a display image.

  As a method for preventing reflection, it is generally known that a base film is provided with an antiglare layer containing fine particles. However, even if the conventional general anti-glare layer has a sufficient effect of preventing reflection, the fine particles used in the anti-glare layer have a high haze value, and there is a problem that transmitted image clarity is lowered. . Furthermore, there is a problem that a glare feeling is generated on the film surface and visibility of a display image is lowered.

In addition, as an antiglare film, it has been proposed to provide an antiglare layer containing two kinds of fine particles such as spherical fine particles on a transparent substrate film (for example, Patent Documents 1 and 2). However, the antiglare layer of the above-mentioned patent document cannot sufficiently improve the reflection preventing property, the transmitted image clearness, and the glare feeling at the same time.
JP 2004-004777 A JP 2006-078710 A

  In view of the problems of the background art, an object of the present invention is to provide an antiglare layer excellent in a reflection preventing function and transmitted image clearness and having a suppressed glare, and an antiglare film using the antiglare layer. The present invention also provides a display filter using the antiglare layer.

The above object of the present invention has been basically achieved by the following invention.
1) A glare-proof layer characterized by containing spherical fine particles (A) and ellipsoidal fine particles (B) in a resin in a mass ratio of 62:38 to 95: 5.
2) The antiglare layer according to 1), wherein the spherical fine particles (A) have an average particle size of 0.1 μm or more and less than 10 μm.
3) The antiglare layer according to 1) or 2) above, wherein an average particle diameter of the ellipsoidal fine particles (B) is 0.1 μm or more and less than 15 μm.
4) The antiglare layer according to any one of 1) to 3), wherein the thickness is from 1 μm to less than 20 μm.
5) The antiglare layer according to any one of 1) to 4) above, wherein the surface 10-point average roughness (Rz) is 0.5 μm or more and less than 5 μm.
6) The antiglare layer according to any one of 1) to 5) above, wherein the surface centerline average roughness (Ra) is 0.05 μm or more and less than 1 μm.
7) An antiglare film in which the antiglare layer according to any one of 1) to 6) is provided on at least one surface of a base film.
8) A display filter having a conductive layer on a substrate film, and the antiglare layer according to any one of 1) to 6) provided on the conductive layer.
9) The display filter according to 8), wherein the conductive layer includes at least a conductive mesh.

  According to the present invention, an antiglare layer having an anti-reflection function and a clear transmitted image and having reduced glare on the screen can be obtained, and an antiglare film having the antiglare layer and a display filter are provided. Can be provided.

  The present invention, as a result of diligent investigation on the above-mentioned problem, that is, an antiglare film having an excellent anti-reflection function, excellent transmitted image clarity and screen visibility, and suppressing glare on the screen, It has been found that the above problem can be solved by providing an antiglare layer containing a combination of fine particles (A) and ellipsoidal fine particles (B). That is, the present invention is characterized by using an antiglare layer in which spherical fine particles (A) and ellipsoidal fine particles (B) are dispersed in a resin.

  The spherical fine particles (A) used in the antiglare layer of the present invention have an average aspect ratio of less than 1.1, preferably an average aspect ratio of 1.08 or less, more preferably an average aspect ratio of 1. 05 or less. The average aspect ratio of the spherical fine particles represents the ratio (Max / Min) of the minimum diameter (Min) and the maximum diameter (Max) of the spherical fine particles. A true sphere has an average aspect ratio of 1.0 (the lowest limit). The spherical fine particles (A) used in the antiglare layer of the present invention are preferably true spheres or particles close to true spheres, and particles having an average aspect ratio close to 1.0 are more preferable. The spherical fine particles (A) are obtained from commercially available products such as Chemisnow (registered trademark) MX series manufactured by Soken Chemical, Seahoster (registered trademark) KE series manufactured by Nippon Shokubai, and Tospearl (registered trademark) series manufactured by GE Toshiba Silicone. be able to.

  On the other hand, the average aspect ratio of the ellipsoidal fine particles (B) used in the antiglare layer of the present invention is 1.1 or more, preferably the average aspect ratio is 1.3 or more, more preferably the average aspect ratio is. 1.4 or more. The upper limit of the average aspect ratio is about 5 from the viewpoints of transmitted image clarity and screen visibility. The shape of the ellipsoidal fine particles (B) is a spindle shape, a shape in which the tip of the spindle shape is round (rugby ball shape), a meteorite shape, a disc shape, an oval shape, a tear drop shape, etc. Examples of the shape include a circle or an ellipse, a spindle shape, a rugby ball shape, an oval shape, a teardrop shape, and the like having a cross-sectional shape shown in FIG. The ellipsoidal fine particles (B) do not include conventionally known fine particles such as amorphous fine particles, cubic fine particles, and acicular fine particles. These irregular fine particles, cubic fine particles, and acicular fine particles do not improve the glare feeling or reduce the transmitted image sharpness. As the ellipsoidal fine particles (B), “Technopolymer (registered trademark) LMX series” manufactured by Sekisui Plastics is commercially available.

  As spherical fine particles (A) and ellipsoidal fine particles (B) used in the antiglare layer of the present invention, organic particles such as acrylic particles, styrene particles, crosslinked acrylic particles, crosslinked styrene particles, and crosslinked siloxane particles, silica particles, Examples include inorganic particles such as alumina particles and titanium oxide particles. In consideration of sedimentation stability, dispersibility in resin, light refraction, reflection, and the like, organic particles are preferable.

  The average particle diameter of the spherical fine particles (A) used in the antiglare layer of the present invention depends on the dispersibility of the particles and the thickness of the antiglare layer, but is preferably in the range of 0.1 μm to 10 μm, preferably 0.5 μm. The range of 8 μm or less is more preferable. The average particle diameter is defined as the maximum diameter (Max) of the above average aspect ratio as the average particle diameter.

  On the other hand, the average particle diameter of the ellipsoidal fine particles (B) is preferably in the range of 1 μm or more and 15 μm or less, more preferably in the range of 3 μm or more and 10 μm or less because the average aspect ratio may be large.

  The content ratio of the spherical fine particles (A) and the ellipsoidal fine particles (B) used in the antiglare layer of the present invention to the antiglare layer may be contained in a mass ratio of 62:38 to 95: 5. Important, when the content of the spherical fine particles (A) increases beyond this range, the glare feeling is not improved, while when the content of the ellipsoidal fine particles (B) exceeds the above range, The clarity of the transmitted image is reduced. The preferable content ratio of the spherical fine particles (A) and the ellipsoidal fine particles (B) is in the range of 65:35 to 90:10, and the more preferable content ratio is in the range of 70:30 to 90:10.

  The total content of the spherical fine particles (A) and the ellipsoidal fine particles (B) used in the antiglare layer of the present invention is 0.5 mass with respect to 100 mass% of all components of the antiglare layer (excluding the organic solvent). % Or more and 8 mass% or less is preferable, and the range of 1 mass% or more and 5 mass% or less is more preferable. When the content of the spherical fine particles (A) and the ellipsoidal fine particles (B) increases beyond this range, the glare and the transmitted image sharpness are lowered, while the spherical fine particles (A) and the ellipsoidal fine particles (B ) Is less than this range, the reflection is reduced.

The antiglare layer of the present invention is a layer in which the above spherical fine particles are dispersed in a resin. Examples of such resins include thermosetting resins or photocurable resins such as acrylic resins, silicone resins, melamine resins, urethane resins, alkyd resins, and fluorine resins. Among these resins, acrylic resins are preferably applied in consideration of the balance of performance, cost, productivity, and the like.
The antiglare layer of the present invention is preferably formed of a curable composition that is cured by heat or active energy rays, more preferably formed of an active energy ray curable composition, and particularly formed of an ultraviolet curable composition. It is preferred that

  The composition for forming the antiglare layer of the present invention is preferably a curable composition using a polyfunctional acrylate compound as an acrylic resin. The polyfunctional acrylate compound is a monomer, oligomer or prepolymer having 3 or more (more preferably 4 or more, more preferably 5 or more) (meth) acryloyloxy groups in one molecule. 3 or more (meth) acryloyloxy groups in one molecule (in the present specification, "... (meth) acryl ..." means "... acryl ... or ... methacryl) ... ”))), The polyhydric alcohol having 3 or more alcoholic hydroxyl groups in one molecule has 3 hydroxyl groups. The compound etc. which become the esterified substance of the above (meth) acrylic acid can be mentioned.

  Specific examples include pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, Dipentaerythritol hexa (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane EO modified tri (meth) acrylate, pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer, pentaerythritol triacrylate toluene diisocyanate urethane prepolymer, Pentaerythritol triacrylate isophorone diisocyanate urethane prepolymer Or the like can be used. These may be used alone or in combination of two or more.

  The use ratio of the polyfunctional acrylate compound described above is preferably 50% by mass or more and 90% by mass or less, and more preferably 50% by mass or more and 80% by mass or less, with respect to 100% by mass of the total amount of the antiglare layer forming composition.

  In addition to the above-mentioned polyfunctional acrylate compound, it is preferable to use one or two functional acrylate compounds in combination for the purpose of relaxing the rigidity of the antiglare layer or reducing shrinkage during curing. Examples of such an acrylate compound include monomers having 1 to 2 ethylenically unsaturated double bonds in one molecule, and any ordinary monomer having radical polymerization can be used without particular limitation. Can do.

  As the monomer having two ethylenically unsaturated double bonds in one molecule, the following compounds (a) to (f) can be used.

  (A) C2-C12 alkylene glycol (meth) acrylic acid diesters: ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, neopentyl Glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and the like.

  (B) (Meth) acrylate diesters of polyoxyalkylene glycol: diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, Polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, etc.

  (C) Polyhydric alcohol (meth) acrylic acid diesters: pentaerythritol di (meth) acrylate and the like.

  (D) (Meth) acrylic diesters of ethylene oxide and propylene oxide adducts of bisphenol A or bisphenol A hydride: 2,2′-bis (4-acryloxyethoxyphenyl) propane, 2,2′-bis ( 4-acryloxypropoxyphenyl) propane and the like.

  (E) Two or more molecules in the molecule obtained by reacting a terminal isocyanate group-containing compound obtained by reacting a diisocyanate compound and two or more alcoholic hydroxyl group-containing compounds in advance with an alcoholic hydroxyl group-containing (meth) acrylate. Urethane (meth) acrylates having a (meth) acryloyloxy group.

(F) Epoxy (meth) acrylates having two or more (meth) acryloyloxy groups in the molecule obtained by reacting a compound having two or more epoxy groups in the molecule with acrylic acid or methacrylic acid.
Compounds having one ethylenically unsaturated double bond in one molecule include methyl (meth) acrylate, ethyl (meth) acrylate, n- and i-propyl (meth) acrylate, n-, sec-, and t-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, methoxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate, hydroxyethyl (meth) acrylate, polyethylene Glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, glycidyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, N-hydroxyethyl (meth) acrylamide, N-vinyl pyrrolide It can be used N- vinyl-3-methylpyrrolidone, and N- vinyl-5-methyl pyrrolidone. These monomers may be used alone or in combination of two or more.

  The use ratio of the monomer having 1 to 2 ethylenically unsaturated double bonds in one molecule is 10% by mass to 40% by mass with respect to 100% by mass of the total amount of the antiglare layer forming composition. Preferably, it is 20 mass% or more and 40 mass% or less.

  Moreover, a reactive diluent can be used suitably. A reactive diluent is a coating agent component having a group that reacts with a monofunctional or polyfunctional acrylic oligomer as well as serving as a solvent in the coating process as a coating medium. It will be. Specific examples of these acrylic oligomers, reactive diluents, and the like can be found in Shinzo Yamashita, Tosuke Kaneko, “Crosslinking Agent Handbook”, published in Taiseisha 1981, pages 267 to 275, pages 562 to 593. Can be referred to.

  In the present invention, as a modifier for the antiglare layer, a coating property improver, an antifoaming agent, a thickener, an antistatic agent, an organic lubricant, an organic polymer compound, an ultraviolet absorber, a light stabilizer, Dyes, pigments, stabilizers, and the like can be used, and these are used as a composition component of the coating layer constituting the antiglare layer within a range that does not impair the reaction due to actinic radiation or heat. The characteristics can be improved.

  In the present invention, as a method of curing the antiglare layer forming composition, for example, a method of irradiating ultraviolet rays as active energy rays or a high temperature heating method can be used, and when these methods are used, It is desirable to add a photopolymerization initiator or a thermal polymerization initiator to the antiglare layer forming composition.

  Specific examples of the photopolymerization initiator include acetophenone, 2,2-diethoxyacetophenone, p-dimethylacetophenone, p-dimethylaminopropiophenone, benzophenone, 2-chlorobenzophenone, 4,4′-dichlorobenzophenone, 4,4′-bisdiethylaminobenzophenone, Michler's ketone, benzyl, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, methyl benzoyl formate, p-isopropyl-α-hydroxyisobutylphenone, α-hydroxyisobutylphenone, 2, Carbonyl compounds such as 2-dimethoxy-2-phenylacetophenone and 1-hydroxycyclohexyl phenyl ketone, tetramethylthiuram monosulfide, tetramethylthio Sulfur compounds such as uranium disulfide, thioxanthone, 2-chlorothioxanthone, and 2-methylthioxanthone can be used. These photopolymerization initiators may be used alone or in combination of two or more. Moreover, as a thermal polymerization initiator, a peroxide compound such as benzoyl peroxide or di-t-butyl peroxide can be used.

  The amount of the photopolymerization initiator or thermal polymerization initiator used is suitably 0.01 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the total amount of the antiglare layer forming composition. When an electron beam or gamma ray is used as the curing means for the active energy ray-curable composition, it is not always necessary to add a polymerization initiator. Further, when thermosetting at a high temperature of 200 ° C. or higher, it is not always necessary to add a thermal polymerization initiator.

  In the antiglare layer forming composition used in the present invention, in order to prevent thermal polymerization during production and dark reaction during storage, thermal polymerization prevention such as hydroquinone, hydroquinone monomethyl ether or 2,5-t-butyl hydroquinone It is desirable to add an agent. The addition amount of the thermal polymerization inhibitor is preferably 0.005% by mass or more and 0.05% by mass or less with respect to the total mass of the antiglare layer forming composition.

  On the other hand, in the case where a laminated film is further provided on the antiglare layer, it is necessary that the coating properties and adhesiveness of the laminated film are not inhibited. In that case, it is preferable to use an acrylic leveling agent. As such a leveling agent, “ARUFON-UP1000 series, UH2000 series, UC3000 series (trade name): manufactured by Toagosei Co., Ltd.” or the like is preferably used. The addition amount of the leveling agent is preferably in the range of 0.01% by mass to 5% by mass with respect to 100% by mass of the total amount of the antiglare layer forming composition. Various coating methods such as reverse coating method, gravure coating method, rod coating method, bar coating method, die coating method or spray coating method may be used as a means for applying the coating comprising the antiglare layer forming composition. it can.

  Examples of the active energy rays used in the present invention include electromagnetic waves that polymerize acrylic vinyl groups such as ultraviolet rays, electron beams, and radiation (α rays, β rays, γ rays, etc.). It is preferable. As the ultraviolet ray source, an ultraviolet fluorescent lamp, a low pressure mercury lamp, a high pressure mercury lamp, an ultra high pressure mercury lamp, a xenon lamp, a carbon arc lamp, or the like can be used. Moreover, when irradiating an active energy ray, if it irradiates under a low oxygen concentration, it can harden | cure efficiently. Furthermore, the electron beam method is advantageous in that the apparatus is expensive and requires operation under an inert gas, but it is not necessary to include a photopolymerization initiator or a photosensitizer in the coating layer. is there.

  The thickness of the antiglare layer may be determined according to the use, but is preferably 0.1 μm or more and 20 μm or less, more preferably 1 μm or more and 15 μm or less, and particularly preferably 2 μm or more and 10 μm or less. When the thickness of the antiglare layer is less than 0.1 μm, even if it is sufficiently cured, the surface hardness is not sufficient because it is too thin, and the surface tends to be damaged. On the other hand, when the thickness exceeds 20 μm Tends to curl at the time of curing or cracks in the cured film due to stress such as bending, both of which are not preferred.

  By providing the above-described antiglare layer on at least one surface of the base film, the antiglare film of the present invention can be obtained. As such a base film, a film that can be formed by melt film formation or solution film formation is preferably used. Specific examples thereof include films made of polyester, polyolefin, polyamide, polyphenylene sulfide, acetate, polycarbonate, acrylic resin, and the like. Among these, a film made of a thermoplastic resin excellent in transparency, mechanical strength, dimensional stability and the like is particularly preferable. In order to use it for image display device applications, it is preferable that the light transmittance is high. Therefore, taking these into consideration, a film made of at least one selected from polyester, acetate and acrylic resin is preferably used. From the viewpoint of transparency and mechanical properties, a film made of polyester is particularly preferably used.

The base film used for the antiglare film of the present invention preferably has a total light transmittance of 40% or more, more preferably 60% or more, as shown in JIS K7361-1 (1997). Examples of the polyester preferably used as the base film of the antiglare layer of the present invention include polyethylene terephthalate, polyethylene naphthalate, polypropylene terephthalate, polybutylene terephthalate, and polypropylene naphthalate. Two or more of these may be mixed. In addition, these may be a polyester copolymerized with other dicarboxylic acid components and diol components, but the copolymerization ratio is preferably 25% or more in the degree of crystallinity in a film in which crystal orientation is completed. More preferred is 30% or more, and still more preferred is 35% or more. When the crystallinity is less than 25%, dimensional stability and mechanical strength tend to be insufficient. The crystallinity can be measured by a method described in “Practical Spectroscopy Series (3) Raman Spectroscopy” issued by IPC Corporation.

When the above-described polyester is used, its intrinsic viscosity (measured in o-chlorophenol at 25 ° C. according to JIS K7367 (2002)) is preferably 0.4 dl / g or more and 1.2 dl / g or less, More preferably, it is 0.5 dl / g or more and 0.8 dl / g or less. When the intrinsic viscosity is less than 0.4 dl / g, the mechanical strength is insufficient, which is not preferable. Further, even if the intrinsic viscosity exceeds this preferable range, not only is the quality excessive, but also the operability during film production is deteriorated, which is economically undesirable.

  As the acetate, triacetyl cellulose, diacetyl cellulose, and the like can be used, and as the acrylic resin, polymethyl methacrylate and the like can be used.

  The base film used for the antiglare film of the present invention may be a composite film having a laminate structure of two or more layers. As the composite film, for example, a composite film that is substantially free of particles in the inner layer portion and provided with a layer containing particles in the surface layer portion, has coarse particles in the inner layer portion, and fine particles in the surface layer portion. And a composite film having a layer in which the inner layer portion contains fine bubbles can be used. In the composite film, the polymer constituting the inner layer portion and the surface layer portion may be a chemically different polymer or the same kind of polymer.

  The base film used for the antiglare film of the present invention is provided with an antiglare layer from the viewpoint of ensuring sufficient thermal stability, particularly dimensional stability and mechanical strength of the film, and improving flatness. In this state, the film is preferably a crystal oriented by biaxial stretching. The crystal orientation by biaxial stretching means that the thermoplastic film before unstretched, that is, before the crystal orientation is completed, is preferably stretched about 2.5 to 5 times in the longitudinal direction and the width direction, respectively, and then heat-treated. The crystal orientation is completed by the above, and it indicates a biaxial orientation pattern by wide-angle X-ray diffraction.

  The thickness of the base film used for the antiglare film of the present invention is appropriately selected according to the use for which the antiglare film of the present invention is used, but is preferable from the viewpoint of mechanical strength and handling properties. Is from 10 μm to 500 μm, more preferably from 20 μm to 300 μm.

  The base film used for the antiglare film of the present invention may contain various additives, resin compositions, crosslinking agents, and the like within a range that does not impair the effects of the present invention. For example, antioxidants, heat stabilizers, UV absorbers, organic and inorganic particles, pigments, dyes, antistatic agents, nucleating agents, acrylic resins, polyester resins, urethane resins, polyolefin resins, polycarbonate resins, alkyd resins, epoxy resins , Urea resin, phenol resin, silicone resin, rubber resin, wax composition, melamine crosslinking agent, oxazoline crosslinking agent, methylolated, alkylolized urea crosslinking agent, acrylamide, polyamide, epoxy resin, isocyanate compound , Aziridine compounds, various silane coupling agents, various titanate coupling agents, and the like.

  Among these, when inorganic particles such as silica, colloidal silica, alumina, alumina sol, kaolin, talc, mica, calcium carbonate, barium sulfate, carbon black, zeolite, titanium oxide, metal fine powder, etc. are added, it is easy to slip. This is particularly preferable since the property and scratch resistance are improved. The average particle size of the inorganic particles is preferably 0.005 μm or more and 5 μm or less, and more preferably 0.05 μm or more and 1 μm or less. The particle size referred to here is a value obtained using a laser diffraction particle size distribution measuring apparatus. The average particle size is 50% distributed particle size. The 50% distribution particle size refers to the particle size where the particle size distribution is 50%. Moreover, the addition amount of the inorganic particles is preferably 0.05 parts by mass or more and 20 parts by mass or less, more preferably 0.1 parts by mass or more and 10 parts by mass or less, in 100 parts by mass of the base film.

The base film used in the antiglare film of the present invention has a configuration in which an easy-adhesion layer is provided on at least one surface for the purpose of improving the adhesion, and the adhesion with a layer laminated on the easy-adhesion layer. It is preferable for improving. Such an easy-adhesion layer preferably has a refractive index in the range of 1.52 to 1.66, and moreover, (refractive index of the easy-adhesion layer) = {(refractive index of the base film) × (easy adhesion). Refractive index of the layer laminated on the layer)} ^1/2 ± 0.02
It is preferable to satisfy the condition because interference fringes generated when laminated on the easy-adhesion layer are reduced. Such an easy-adhesion layer is not particularly limited as long as it has excellent adhesion to the layer laminated on the easy-adhesion layer and has the above-mentioned refractive index. A flexible polyurethane resin is preferably used. The easy adhesion layer is preferably applied in the middle of the film forming process and formed simultaneously with the film formation, and the thickness is preferably 0.04 μm or more and 0.20 μm or less.

  The 10-point average roughness (Rz) of the antiglare layer of the present invention is preferably in the range of 0.5 μm or more and less than 5 μm, more preferably in the range of 0.5 μm or more and less than 3 μm, particularly in the range of 1 μm or more and less than 2.5 μm. preferable. When Rz is less than 0.5 μm, the reflection function of the antiglare layer becomes insufficient, which is not preferable. On the other hand, when Rz is 5 μm or more, the glare of the screen is remarkably deteriorated.

  The centerline average roughness (Ra) of the antiglare layer of the present invention is preferably in the range of 0.05 μm or more and less than 0.8 μm, more preferably in the range of 0.05 μm or more and less than 0.5 μm. A range of less than 3 μm is preferred. When Ra is less than 0.05 μm, the reflection function of the antiglare layer becomes insufficient, which is not preferable. On the other hand, when Ra is 0.8 μm or more, the glare of the screen is remarkably deteriorated.

  In addition, the antiglare layer of the present invention can be further laminated with an antireflection layer. As such an antireflection layer, for example, a single structure of a low refractive index layer having a refractive index of 1.25 or more and 1.45 or less, or a high refractive index layer having a refractive index of 1.5 or more and 1.7 or less and a refractive index. Examples include a laminated structure of low refractive index layers having a refractive index of 1.25 or more and 1.45 or less.

  Since the antiglare layer of the present invention has high surface hardness and scratch resistance, it can be used in a wide range of applications. For example, it can be applied to the surface of membrane switches, curved mirrors, rearview mirrors, goggles, window glass, posters, advertising towers, nameplates and instrument covers, and other various commercial displays. Especially for image display members such as liquid crystal display (LCD), plasma display panel (PDP), electroluminescence display (ELD), cathode ray tube display (CRT), portable digital assistant (PDA), adhesive layer or adhesive layer It can stick and apply to the surface of an image display surface and / or the front plate through it.

  A display filter can be obtained by laminating the above-described antiglare layer of the present invention and another functional film such as a near-infrared shielding film, an electromagnetic wave shielding film, an antireflection film and the like.

  The display filter of the present invention can be obtained by laminating the above-described antiglare layer of the present invention on a conductive layer provided on a base film used for an antiglare film. Hereinafter, the display filter of this embodiment will be described in detail. Examples of the base film used for the display filter include base films similar to those used for the antiglare film.

  The conductive layer provided on the base film is used, for example, to shield electromagnetic waves generated from a plasma display or the like. The sheet resistance of the conductive layer is preferably 3Ω / □ or less, more preferably 1Ω / □ or less, from the viewpoint of electromagnetic wave shielding. A lower sheet resistance is preferable because the electromagnetic wave shielding property is improved, but a practical lower limit is considered to be about 0.01Ω / □.

  A conventionally well-known conductive layer can be used as a conductive layer provided on the base film used for the anti-glare film of the present invention. For example, a conductive thin film, a conductive mesh, etc. are mentioned. As the conductive thin film, a metal thin film, an oxide semiconductor film, a laminate thereof, or the like can be used. As a material for the metal thin film, a metal selected from silver, gold, palladium, copper, indium and tin, an alloy of silver and other metals, or the like is used. As a method for forming the metal thin film, a known method such as sputtering, ion plating, vacuum deposition, or plating can be used. As a material of the oxide semiconductor film, an oxide or sulfide of zinc, titanium, indium, tin, zirconium, bismuth, antimony, tantalum, cerium, neodymium, lanthanum, thorium, magnesium, gallium, or a mixture of these oxides Etc. are used. As a method for forming the oxide semiconductor, a known method such as sputtering, ion plating, ion beam assist, vacuum deposition, or wet coating can be used. As the conductive mesh, for example, a fiber mesh obtained by metal coating a synthetic fiber or metal fiber mesh, a metal mesh obtained by forming a metal mesh pattern, or the like can be used.

  The conductive layer used in the display filter of the present invention is preferably a conductive layer containing a conductive mesh. The configuration of the conductive layer including the conductive mesh is, for example, an aspect in which the entire conductive layer is configured by a mesh pattern, or when the display filter provided with the conductive layer is installed on the display, The aspect which the electroconductive layer of the corresponding part was comprised by the mesh pattern, and the electroconductive layer of the part corresponding to the outer periphery (non-image display area) was comprised by the metal solid part is mentioned.

  A known method can be used as a method of forming a conductive layer including a conductive mesh on a base film. For example, 1) A method of printing a conductive ink in a pattern on a substrate film. 2) Method of performing plating after pattern printing with ink containing catalyst core for plating, 3) Method of using conductive fiber, 4) Method of patterning after bonding metal foil on base film with adhesive, 5 Examples thereof include a method of patterning after forming a metal thin film on a base film by vapor deposition or plating, 6) a method using a photosensitive silver salt, and 7) a method of laser ablating the metal thin film. However, it is not limited to these.

  The manufacturing method of the conductive layer including the conductive mesh will be described in detail.

  1) The method of printing the conductive ink on the base film in a pattern is a method of printing the conductive ink on the base film in a pattern by a known printing method such as screen printing or gravure printing.

  2) The method of plating after pattern printing with an ink containing catalyst cores for plating is, for example, printing in a pattern using a catalyst ink made of a palladium colloid-containing paste and immersing this in an electroless copper plating solution. Electroless copper plating, followed by electrolytic copper plating, and further by electrolytic plating of a Ni-Sn alloy to form a conductive mesh pattern.

  3) A method using conductive fibers is a method in which a knitted fabric made of conductive fibers is bonded through an adhesive or an adhesive.

  4) The method of patterning after laminating a metal foil on a base film with an adhesive was performed by laminating a metal foil (copper, aluminum, nickel, etc.) on the base film via an adhesive or an adhesive. Thereafter, a resist pattern is produced from the metal foil using a photolithography method or a screen printing method, and then the metal foil is etched. As a method for forming the above resist pattern, a photolithography method is preferable, and the photolithography method is a method of applying a photosensitive resist on a metal foil or laminating a photosensitive resist film, adhering a pattern mask, and exposing, This is a method of forming an etching resist pattern by developing with a developing solution, and further eluting metals other than the pattern portion with an appropriate etching solution to form a desired conductive mesh.

  5) A method of patterning after forming a metal thin film on a base film by vapor deposition or plating is performed by using a metal thin film (copper, aluminum, silver, gold, palladium, indium, tin, or A metal made of an alloy of silver and other metals) is formed by vapor deposition such as vapor deposition, sputtering, ion plating, or plating, and this metal thin film is formed by photolithography or screen printing. This is a method of etching a metal thin film after producing a resist pattern using it. As a method of forming the above resist pattern, a photolithography method is preferable, and the photolithography method is a method of applying a photosensitive resist on a metal thin film or laminating a photosensitive resist film, adhering a pattern mask, and exposing, This is a method of forming an etching resist pattern by developing with a developing solution, and further eluting metals other than the pattern portion with an appropriate etching solution to form a desired conductive mesh. In this method, it is preferable to form a metal thin film on a transparent substrate without using an adhesive or a pressure-sensitive adhesive.

  6) A method using a photosensitive silver salt is a method in which a silver salt emulsion layer such as silver halide is coated on a base film, and after photomask exposure or laser exposure, development processing is performed to form a silver mesh. is there. The formed silver mesh is preferably further plated with a metal such as copper or nickel. This method is described in WO 2004/7810, JP-A 2004-221564, JP-A 2006-12935, and the like, and can be referred to.

  7) The method of laser ablating a metal thin film is a method of producing a mesh pattern of a metal thin film by a laser ablation method using a metal thin film formed on a substrate film by the same method as in 5) above.

  Laser ablation means that when a solid surface that absorbs laser light is irradiated with laser light with a high energy density, the bonds between the irradiated parts are broken and evaporated, causing the solid surface of the irradiated part to break. It is a phenomenon that is cut away. By utilizing this phenomenon, the solid surface can be processed. Since laser light is highly straight and condensing, it is possible to selectively process a fine area about 3 times the wavelength of the laser light used for ablation, and high processing accuracy is obtained by the laser ablation method. I can do it.

  The laser used for such ablation can be any laser having a wavelength that is absorbed by the metal. For example, a gas laser, a semiconductor laser, an excimer laser, or a solid laser using a semiconductor laser as an excitation light source can be used. A second harmonic light source (SHG), a third harmonic light source (THG), or a fourth harmonic light source (FHG) obtained by combining these solid-state lasers and a nonlinear optical crystal can be used.

  Among such solid-state lasers, an ultraviolet laser having a wavelength of 254 nm to 533 nm is preferably used from the viewpoint of not processing a plastic film. Among them, it is preferable to use a solid laser SHG (wavelength 533 nm) such as Nd: YAG (neodymium: yttrium, aluminum, garnet), and more preferably a solid laser THG (wavelength 355 nm) ultraviolet laser such as Nd: YAG. .

  As a laser oscillation method, any type of laser can be used. From the viewpoint of processing accuracy, a pulse laser is preferably used, and a Q-switch type pulse laser having a pulse width of ns or less is more preferable.

  After forming a metal oxide layer of 0.01 μm or more and 0.1 μm or less on the metal thin film (viewing side), it is preferable to laser ablate the metal thin film and the metal oxide layer. As the metal oxide, metal oxides such as copper, aluminum, nickel, iron, gold, silver, stainless steel, chromium, titanium, and tin can be used. However, copper oxide is used from the viewpoint of price and film stability. preferable. As a method for forming the metal oxide, a vacuum deposition method, a sputtering method, an ion plate method, a chemical vapor deposition method, an electroless method, an electrolytic plating method, or the like can be used.

  In a preferred embodiment of the display filter of the present invention, the above-described antiglare layer of the present invention is directly laminated on a conductive layer including a conductive mesh provided on a base film. The antiglare layer of the present invention is more preferably formed by coating directly on the conductive layer.

From the viewpoint of coating suitability when the antiglare layer of the present invention is directly formed on the conductive layer containing the conductive mesh, the thickness of the conductive layer containing the conductive mesh is preferably smaller. Specifically, the range of 1 μm to 8 μm is preferable, the range of 2 μm to 7 μm is more preferable, and the range of 2.5 μm to 5 μm is particularly preferable. When the thickness of the conductive layer is less than 1 μm, sufficient electromagnetic wave shielding properties may not be obtained. On the other hand, if the thickness of the conductive layer exceeds 8 μm, the coating property of the antiglare layer is lowered, so that it is difficult to stably form the antiglare layer having a uniform surface roughness in the surface. .
Among the above-described methods for producing a conductive layer including a conductive mesh, a conductive mesh having a relatively small thickness (for example, a conductive mesh having a thickness of 8 μm or less) can be easily produced, and high electromagnetic shielding properties are ensured. From the viewpoint of being able to do so, the above production methods 2), 5), 6) and 7) are preferably used.

  Moreover, from the viewpoint of the coating properties of the antiglare layer of the present invention and the adhesion between the antiglare layer and the conductive layer, the conductive mesh produced by the production methods of 2), 5) and 7) above is used. Preferably used. In particular, the production method 5) is particularly preferably used because the coating property of the antiglare layer is good and the production cost of the conductive mesh is low.

  The production method 5) will be described in more detail. As a method for forming a metal thin film on a substrate film, a vapor deposition method is preferred. Examples of the vapor deposition method include sputtering, ion plating, electron beam vapor deposition, vacuum vapor deposition, and chemical vapor deposition. Among these, sputtering and vacuum vapor deposition are preferable. As a metal for forming a metal thin film, an alloy or a multilayer of one or more of metals such as copper, aluminum, nickel, iron, gold, silver, stainless steel, chromium and titanium is used. can do. Among these, copper is preferably used from the viewpoints of obtaining good electromagnetic shielding properties, easy mesh pattern processing, and low cost. Moreover, when using copper as a metal of a metal thin film, it is preferable to further use a nickel thin film with a thickness of 5 to 100 nm between the base film and the copper thin film. Thereby, the adhesiveness of a base film and a copper thin film improves. In addition, the thickness of the electroconductive mesh in such an aspect shall mean the sum total thickness of a nickel thin film layer and a copper thin film layer.

  As a method for forming a resist pattern on the metal thin film, photolithography is preferably used. In such a photolithography method, a photosensitive resist layer is laminated on a metal thin film, the resist layer is exposed to a mesh pattern, developed to form a resist pattern, and then the metal thin film is etched to form a mesh pattern. In this method, the resist layer on the mesh is peeled and removed. As the photosensitive resist layer, a negative resist in which the exposed portion is cured or a positive resist in which the exposed portion is dissolved by development can be used. The photosensitive resist layer may be coated and laminated directly on the metal thin film, or a film made of a photoresist may be bonded. As a method for exposing the photoresist layer, there can be used a method of exposing with an ultraviolet ray or the like through a photomask, or a method of directly scanning and exposing using a laser. Etching methods include chemical etching methods. Chemical etching is a method in which a metal other than a metal portion protected by a resist pattern is dissolved and removed with an etching solution. Examples of the etching solution include a ferric chloride aqueous solution, a cupric chloride aqueous solution, and an alkaline etching solution.

  The conductive layer including the conductive mesh provided on the base film used for the antiglare layer of the present invention is preferably blackened. By applying a blackening treatment, reflection from the viewer side and reflection from the display side due to the metallic luster of the conductive mesh can be reduced, and further reduction in image visibility can be reduced. An excellent display filter can be obtained. The pitch of the conductive mesh in the conductive layer including the conductive mesh is preferably in the range of 50 μm to 500 μm, more preferably in the range of 75 to 450 nm, and still more preferably in the range of 100 μm to 350 μm. If the pitch of the conductive mesh is smaller than 50 μm, the transmittance tends to decrease, and if it exceeds 500 μm, the conductivity tends to decrease, which is not preferable. Here, the pitch of the conductive mesh is the interval between the portions where the conductive mesh does not exist (opening portions surrounded by the thin lines of the conductive mesh). Specifically, the center of gravity of one opening portion, The distance between the center of gravity of the opening and the center of gravity of the adjacent opening sharing one side.

  The line width of the conductive mesh in the conductive layer including the conductive mesh is preferably in the range of 3 μm to 30 μm, and more preferably in the range of 5 μm to 20 μm. When the line width of the conductive mesh is smaller than 3 μm, the electromagnetic shielding property tends to be lowered. On the other hand, when the line width is larger than 30 μm, the transmittance tends to be lowered. The shape of the mesh pattern of the conductive mesh (the shape of the opening) is, for example, a lattice mesh pattern formed of a quadrangle such as a square, a rectangle, or a rhombus, a triangle, a pentagon, a hexagon, an octagon, or a dodecagon. Examples thereof include a mesh pattern made of a polygon, a mesh pattern made of a circle and an ellipse, a mesh pattern made of the composite shape, and a random mesh pattern. Among these, a lattice mesh pattern made of a tetragon and a mesh pattern made of a hexagon are preferable, and a regular mesh pattern is more preferably used.

  When the antiglare layer of the present invention is applied and formed on a conductive layer including a conductive mesh, the thickness of the antiglare layer (thickness from the base film) is 110% with respect to 100% of the thickness of the conductive layer. The above is preferable, 120% or more is more preferable, and 130% or more is particularly preferable. An upper limit of about 400% is appropriate. Here, the thickness of the antiglare layer is the thickness after coating and drying (after curing when curing after coating and drying). In the display filter of the present invention, the center line average roughness Ra of the antiglare layer is preferably in the range of 0.1 μm or more and less than 1 μm, and preferably 0.2 μm or more and less than 0.8 μm. Further, an antireflection layer can be further laminated on the antiglare layer. As such an antireflection layer, for example, a single structure of a low refractive index layer having a refractive index of 1.25 or more and 1.45 or less, or a high refractive index layer having a refractive index of 1.5 or more and 1.7 or less and a refractive index. Examples include a laminated structure of low refractive index layers having a refractive index of 1.25 or more and 1.45 or less.

(Other functional layers)
The display filter of the present invention preferably has a functional layer having at least one function selected from the group consisting of a near infrared blocking function, a color tone correction function, an ultraviolet blocking function, and a Ne cut function. These functional layers may be functional layers having a plurality of functions in one layer. The functional layer may be a stack of a plurality of layers. The functional layer constituting the display filter of the present invention will be described below.

(Color tone correction layer)
A color correction layer having a color correction function, which is a kind of functional layer, is a layer containing a dye having a color correction function, and performs color correction of transmitted visible light to improve the image characteristics of a display panel. In order to achieve high contrast and high color. Moreover, the transmittance of the entire display filter can be adjusted by the color tone correction layer, and it also plays a role of adjusting the reflection performance.

  The color tone correction is achieved by selectively absorbing visible light having a specific wavelength out of visible light transmitted through the display filter. Accordingly, the dye contained in the color tone correction layer selectively absorbs visible light having a specific wavelength, and the dye can be either a dye or a pigment. “Selectively absorb visible light having a specific wavelength” refers to specifically absorbing light in a specific wavelength region out of light in the visible light wavelength region (wavelength 380 to 780 nm). Here, the wavelength region specifically absorbed by the dye may be a single wavelength region or a plurality of wavelength regions.

  Specific examples of the dye that absorbs such a specific wavelength include, for example, azo, condensed azo, phthalocyanine, anthraquinone, indigo, perinone, perylene, dioxazine, quinacridone, methine, Well-known organic pigments and organic dyes such as isoindolinone-based, quinophthalone-based, pyrrole-based, thioindigo-based, and metal complex-based materials, and inorganic pigments can be used. Among these, phthalocyanine-based and anthraquinone-based dyes are particularly preferable because of their good weather resistance. In addition, any one of the above-described dyes may be contained in the color correction layer, or two or more kinds may be contained.

  Further, the display filter may be required to have a transmission color of neutral gray or blue gray. This is because, when it is necessary to maintain or improve the light emission characteristics and contrast of the plasma display panel, white having a slightly higher color temperature than standard white may be preferred. The above dyes can also be applied to achieve such requirements.

  The color correction layer can take various forms as long as it contains a dye having a color correction capability. The color tone correction layer may be formed by a suitable method depending on the mode. For example, in the case of a mode in which a dye having a color tone correcting ability is contained in the pressure-sensitive adhesive, a color tone having a desired thickness is applied by adding a dye having a color tone correcting ability as a dye or pigment in the pressure-sensitive adhesive. A layer may be formed. Commercially available pressure-sensitive adhesives can be used as the pressure-sensitive adhesive, but preferred specific examples include acrylate copolymer, polyvinyl chloride, epoxy resin, polyurethane, vinyl acetate copolymer, styrene-acrylic. Mention may be made of pressure-sensitive adhesives such as copolymers, polyesters, polyamides, polyolefins, styrene-butadiene copolymer rubbers, butyl rubbers, or silicone resins.

  In the case of a mode in which a color tone correction layer is formed by coloring a base film and a transparent substrate, a dye having a color tone correction ability is used as a dye or a pigment as it is or dissolved in a solvent, and is applied and dried. A color tone correction layer having a thickness may be formed. Solvents used for this purpose include ketone solvents such as cyclohexanone, ether solvents, ester solvents such as butyl acetate, ether alcohol solvents such as ethyl cellosolve, ketone alcohol solvents such as diacetone alcohol, toluene, etc. Aromatic solvents and the like.

  Further, when the color tone correction layer is a base film containing a colorant having a color tone correction ability, a thermoplastic resin as a raw material of the base film is dissolved in a desired solvent, and the colorant having a color tone correction ability is dyed Alternatively, a solution obtained by adding as a pigment may be applied and dried to form a color correction layer having a desired thickness. The solvent used here only needs to be able to dissolve the resin as a raw material and to dissolve or disperse the added dye or pigment. Solvents used for this purpose include ketone solvents such as cyclohexanone, ether solvents, ester solvents such as butyl acetate, ether alcohol solvents such as ethyl cellosolve, ketone alcohol solvents such as diacetone alcohol, toluene, etc. Aromatic solvents and the like.

  In a method of forming a color correction layer by applying a solution containing a dye having color tone correction ability, or a solution containing a dye having color tone correction ability and a raw material resin for a base film, as a coating method, for example, a dip coating method is used. A roll coating method, a spray coating method, a gravure coating method, a comma coating method, a die coating method and the like can be selected. These coating methods can be continuously processed, and are more productive than batch-type vapor deposition methods. Alternatively, a spin coating method capable of forming a thin and uniform coating film can also be employed.

  The thickness of the color tone correction layer is preferably 0.5 μm or more in order to obtain a sufficient color tone correction capability. Further, it is preferably 40 μm or less, and particularly preferably 1 μm or more and 25 μm or less, because of its excellent light transmittance, more specifically visible light transmittance. When the thickness of the color correction layer is 40 μm or more, the solvent tends to remain when forming a color correction layer by applying a solution containing a desired dye, pigment, and transparent resin, and operations for forming the color correction layer It is not preferable because the property becomes difficult.

  When the color tone correction layer is a pressure-sensitive adhesive layer containing a colorant having a color tone correction ability or a base film containing a colorant having a color tone correction ability, the colorant is 0.1% relative to the pressure sensitive adhesive or the thermoplastic resin. The content is preferably at least 1% by mass, particularly preferably at least 1% by mass. Moreover, in order to maintain the physical properties of the pressure-sensitive adhesive layer or the base film, it is preferable to suppress the amount of the dye having a color tone correcting ability to 10% by mass or less.

(Near infrared blocking layer)
Next, a near-infrared blocking layer having a near-infrared blocking function, which is a type of functional layer, will be described. The near-infrared rays generated from the plasma display panel act on peripheral electronic devices such as a remote controller and a cordless phone to cause a malfunction. Therefore, it is necessary to cut the light in the near-infrared region to a level at which there is no practical problem. The problem wavelength region is 800 to 1000 nm, and the transmittance in the wavelength region is required to be 20% or less, preferably 10% or less. The near-infrared shielding layer is usually a pigment having a near-infrared absorption ability having a maximum absorption wavelength of 750 to 1100 nm for blocking near-infrared rays, specifically, polymethine, phthalocyanine, naphthalocyanine, metal complex, Aminium-based, imonium-based, diimonium-based, anthraquinone-based, dithiol-metal complex-based, naphthoquinone-based, indolephenol-based, azo-based, triallylmethane-based compounds, etc. are preferably applied, metal complex-based, aminium-based, phthalocyanine-based, Particularly preferred are naphthalocyanine and diimonium. In addition, when using the pigment | dye which has a near-infrared absorptivity, you may contain any 1 type and may contain 2 or more types.

  The structure, formation method, thickness, and the like of the near infrared absorption layer are the same as those of the color tone correction layer described above. The near-infrared absorbing layer may be the same layer as the color tone correcting layer, that is, the color tone correcting layer may contain a colorant having a color tone correcting ability and a colorant having a near infrared ray absorbing ability. You may provide the near-infrared shielding layer different from a layer. The amount of the near-infrared absorbing pigment is preferably 0.1% by mass or more, particularly preferably 2% by mass or more, based on the binder resin, but the physical properties of the pressure-sensitive adhesive layer or substrate film containing the infrared absorber are preferred. In order to maintain this, it is preferable to keep the total amount of the dye having the color tone correcting ability and the near-infrared absorber to 10% by mass or less.

(Ne cut layer)
Next, a functional layer having a Ne cut function, which is a kind of functional layer, will be described. For the near-infrared shielding layer or color tone correction layer, an extra luminescent color (mainly in the wavelength region of 560 to 610 nm) from the discharge gas sealed in the plasma display panel, for example, a binary gas of neon and xenon, is selectively used. It is preferable to mix and contain one or more kinds of color correction agents for absorption / attenuation. By adopting such a dye structure, of the visible light emitted from the display screen of the plasma display panel, excess light due to the emission of the discharge gas is absorbed and attenuated. As a result, the visible light emitted from the plasma display panel is absorbed. The display color can be brought close to the display color of the display target, and a natural color tone can be displayed.

(UV blocking layer)
Next, an ultraviolet blocking layer having an ultraviolet blocking function, which is a kind of functional layer, will be described. In the display filter of the present invention, the ultraviolet blocking layer has a role of preventing the photodegradation of the dye contained in the color correction layer, the infrared blocking layer and the like located on the panel side of this layer. For the ultraviolet blocking layer, a substrate film containing an ultraviolet absorber, an adhesive layer, and the like are used.
Moreover, it is preferable that Tg of the layer containing a ultraviolet absorber is 60 degreeC or more, and it is more preferable that it is 80 degreeC or more. When a UV absorber is contained in a thermoplastic resin having a low Tg, the UV absorber may move to the pressure-sensitive adhesive interface or the adhesive interface, thereby hindering the stickiness or adhesiveness. If the Tg of the thermoplastic resin containing the ultraviolet absorber is 60 ° C. or more, the possibility of the ultraviolet absorber moving in the base film is reduced, and other components of the display filter, specifically, for example, When the transparent substrate, the color tone correction layer, or another base film forming part of the antireflection layer is bonded via the interlayer adhesive layer, the tackiness is not hindered.

  Examples of the resin having a Tg of 60 ° C. or higher constituting the base film include polyethylene terephthalate, aromatic polyester typified by polyethylene naphthalate, nylon 6 and aliphatic polyamide typified by nylon 66, aromatic polyamide, polycarbonate and the like. Illustrated. Among these, aromatic polyester is preferable, and polyethylene terephthalate that can form a biaxially stretched film excellent in heat resistance and mechanical strength is particularly preferable.

  Preferred examples of the ultraviolet absorber include salicylic acid compounds, benzophenone compounds, benzotriazole compounds, cyanoacrylate compounds, benzoxazinone compounds, and cyclic imino ester compounds, but at 380 nm to 390 nm. A benzoxazinone-based compound is most preferable from the viewpoint of ultraviolet blocking properties, color tone, and the like. These compounds may be used alone or in combination of two or more. Moreover, combined use of stabilizers, such as HALS (hindered amine light stabilizer) and antioxidant, is more preferable.

  Examples of benzoxazinone-based compounds that are preferable materials include 2-p-nitrophenyl-3,1-benzoxazin-4-one and 2- (p-bezoylphenyl) -3,1-benzoxazine-4. -One, 2- (2-naphthyl) -3,1-benzoxazin-4-one, 2-2'-p-phenylenebis (3,1-benzoxazin-4-one), 2,2 '-( 2,6-naphthylene) bis (3,1-benzoxazin-4-one) and the like can be exemplified. The amount of these compounds added is preferably 0.5% by mass or more and 5% by mass or less in the base film.

  Moreover, it is preferable to use a cyanoacrylate-based tetramer compound in combination in order to impart further excellent light resistance. It is preferable to contain 0.05 mass% or more and 2 mass% or less of a cyanoacrylate type | system | group tetramer compound in a base film. The cyanoacrylate-based tetramer compound is a compound based on a tetramer of cyanoacrylate, such as 1,3-bis (2′cyano-3,3-diphenylacryloyloxy) -2, 2-bis-. (2 'cyano-3,3-diphenylacryloyloxymethylpropane). When used in combination with this, the above-mentioned ultraviolet absorber is preferably 0.3% by mass or more and 3% by mass or less in the base film.

  In the ultraviolet blocking layer, the transmittance at a wavelength of 380 nm is preferably 5% or less, so that the base material, the dye pigment, and the like can be protected from ultraviolet rays.

  The content of the ultraviolet absorber in the ultraviolet blocking layer is preferably 0.1% by mass or less and 5% by mass or more, and more preferably 0.2% by mass or more and 3% by mass or less. When the content of the ultraviolet absorber is 0.1% by mass or more and 5% by mass or less, the ultraviolet ray incident from the viewer side of the display filter is absorbed, and the effect of preventing photodegradation of the dye contained in the color tone correction layer And does not impair the strength of the base film or adhesive layer.

  The method of adding the ultraviolet absorber to the ultraviolet blocking layer, particularly the base film, is not particularly limited, but the polymerization process of the thermoplastic resin, the kneading into the thermoplastic resin in the melting process before film formation, the biaxially stretched film Examples of impregnation are described. In particular, it is preferable to knead into the thermoplastic resin in the melting step before film formation in order to prevent a decrease in the polymerization degree of the thermoplastic resin. The kneading of the ultraviolet absorber at that time can be performed by a direct addition method of the powder of the agent, a master batch method in which a master polymer containing the agent in a high concentration is added to the film-forming polymer, or the like.

  The ultraviolet cut layer preferably has a thickness in the range of 5 μm to 250 μm, more preferably 50 μm to 200 μm, and still more preferably 80 μm to 200 μm. When the thickness of the ultraviolet absorbing layer is in the range of 5 μm or more and 250 μm or less, it is excellent in the effect of absorbing the ultraviolet rays incident from the viewer side of the display filter, and has light transmittance, specifically visible light transmittance. Is excellent.

(Adhesive layer)
In the present invention, an adhesive layer having adhesiveness may be used to bond the various functional layers described above or to bond a display filter to a display. The adhesive used at this time is not particularly limited as long as it is an adhesive that adheres two objects by its adhesive action, and an adhesive made of rubber, acrylic, silicone or polyvinyl ether is used. it can.

  Furthermore, the pressure-sensitive adhesive is roughly classified into two types, a solvent-type pressure-sensitive adhesive and a solventless pressure-sensitive adhesive. Solvent-type pressure-sensitive adhesives excellent in dryness, productivity, and processability are still mainstream, but in recent years, they are changing to solvent-free pressure-sensitive adhesives in terms of pollution, energy saving, resource saving, safety, and the like. Among these, it is preferable to use an actinic radiation curable pressure sensitive adhesive that is a pressure sensitive adhesive that is cured in seconds by irradiation with actinic radiation and has excellent properties such as flexibility, adhesion, and chemical resistance.

  Specific examples of the actinic radiation curable acrylic pressure-sensitive adhesive can be referred to the Japan Adhesive Society, “Adhesive Data Book”, published by Nikkan Kogyo Shimbun, 1990, pages 83 to 88. It is not limited to. Hitachi Chemical Polymer Co., Ltd. (trade name XY (registered trademark) series, etc.), Toho Kasei Kogyo Co., Ltd. (trade name Hilock (registered trademark) series, etc.), stock, etc. Company Three Bond; (trade name Three Bond (registered trademark) series, etc.), Toa Gosei Chemical Industry Co., Ltd. (trade name Arontite (registered trademark) series, etc.), Cemedine Co., Ltd. ) Etc. can be used, but is not limited to these.

  EXAMPLES Next, although this invention is demonstrated based on an Example, this invention is not limited to these. The physical property value measurement method and the effect evaluation method are defined as follows.

1) Centerline average roughness (Ra)
Based on JIS B0601 (1982), it measured on condition of the following using surface roughness measuring device SE-3400 by Kosaka Laboratory.
Measurement conditions: SPEED; 0.5 mm / S, cut-off value: 0.25 mm, measurement length: 8 mm.

2) 10-point average roughness (Rz)
Based on JIS B0601 (1982), it measured on condition of the following using surface roughness measuring device SE-3400 by Kosaka Laboratory.
Measurement conditions: SPEED; 0.5 mm / S, cut-off value: 0.25 mm, measurement length: 8 mm.

3) Evaluation of reflection property The produced anti-glare film was stuck on the surface of a commercially available liquid crystal TV, a daylight fluorescent lamp (8000 cd / cm ² ) was projected, and the degree of the reflected image was evaluated in the following three stages.
○: The outline of the fluorescent lamp is hardly understood.
Δ: The fluorescent lamp is blurred, but the outline can be seen.
X: A fluorescent lamp is clearly visible.
Judgment was made by three persons, and the most frequent judgment result was taken as the evaluation result.

4) Evaluation of transmitted image sharpness The produced antiglare film was attached to the surface of a commercially available liquid crystal TV, a test pattern image was projected on the image, and the sharpness was evaluated in the following three stages.
○: The linearity of the image is clearly identified.
Δ: The linearity of the image looks blurry but can be identified.
×: The linearity of the image is blurred and cannot be identified.
Judgment was made by three persons, and the judgment result with the highest frequency was taken as the evaluation result.

5) Evaluation of glaring feeling of display image The produced anti-glare film was stuck on the surface of a commercially available liquid crystal TV, a test pattern image was projected on the image, and evaluated in the following three stages.
○: No glare.
Δ: Slightly glaring.
X: Great feeling of glare.
Judgment was made by three persons, and the most frequent judgment result was taken as the evaluation result.

6) The cross section of the film having a film thickness antiglare layer is observed using a transmission electron microscope (H-7100FA type manufactured by Hitachi) at an acceleration voltage of 100 kV. Sample preparation uses an ultrathin section method. Observation is performed at a magnification of 100,000 times or 200,000 times, and the thickness of the antiglare layer is measured.

7) The cross section of the average aspect ratio and the average particle size antiglare layer is observed at an acceleration voltage of 100 kV using a transmission electron microscope (Hitachi H-7100FA type). Sample preparation uses an ultrathin section method. Observe at a magnification of 100,000 or 200,000, and photograph any 10 particles with a photograph, and for each particle, as shown in FIG. The maximum is obtained and set as the minimum diameter (Min) and the maximum diameter (Max), respectively. For the aspect ratio, the ratio (Max / Min) of the minimum diameter (Min) and the maximum diameter (Max) of the particles was determined for each of 10 particles, and the obtained aspect ratio values were averaged. Moreover, the average particle diameter averaged the value obtained about the maximum diameter (Max).

(Spherical fine particles (A) used in Examples and Comparative Examples)
<Acrylic (A1) particles>: average aspect ratio 1.0, average particle size 1.0 μm, (Chemisnow (registered trademark) MX series manufactured by Soken Chemical).

  <Acrylic (A2) particles>: average aspect ratio 1.0, average particle size 3.0 μm, (Chemisnow (registered trademark) MX series manufactured by Soken Chemical).

(Ellipsoidal fine particles (B) used in Examples and Comparative Examples)
<Acrylic (B) particles>: average aspect ratio 1.8, average particle size 6.0 μm, (Techpolymer (registered trademark) LMX series manufactured by Sekisui Plastics).

Example 1
An antiglare film was prepared as follows.
A commercially available hard coat agent (Opstar (registered trademark) Z7534 manufactured by JSR; solid content concentration 60% by weight) was diluted with methyl ethyl ketone so that the solid content concentration was 50% by weight, and acrylic (A1) particles and acrylic The system (B) particles were added at a mass ratio of 90:10 in a total of 2% by mass and dispersed at room temperature for 10 minutes to prepare an antiglare layer (antiglare hard coat layer) coating. In addition, the density | concentration of said acrylic particle is a density | concentration with respect to 100 mass% of all the components except the organic solvent of a glare-proof layer, and the following Examples are also synonymous. Use a commercially available optically-adhesive polyester film for optical use (Lumirror (registered trademark) QT90 manufactured by Toray Industries, Inc., thickness 100 μm) as the base film, and apply the antiglare layer paint prepared above on the easy-adhesion surface with a microgravure coater. Then, after drying at 80 ° C., ultraviolet ray 400 mJ / cm ² was irradiated and cured, and an antiglare film having a thickness of about 3 μm was provided to produce an antiglare film. Table 1 shows the evaluation results of the obtained antiglare film. The antiglare film of Example 1 had good transparency, no glare, and good reflection prevention function.

(Comparative Example 1)
In the antiglare layer coating material of Example 1, the additive particle configuration is replaced with acrylic (A1) particles and acrylic (B) particles, except that only 2% by mass of acrylic (A1) particles are added. The antiglare layer coating material was prepared in the same manner as in Example 1, and an antiglare film was obtained in the same manner as in Example 1. Table 1 shows the evaluation results of the obtained antiglare film. As is clear from Table 1, Comparative Example 1 does not contain acrylic (B) particles, so that the transmitted image is clear but has a glare feeling and an anti-reflection function. It was.

(Comparative Example 2)
In the antiglare layer coating material of Example 1, the additive particle configuration is replaced with acrylic (A1) particles and acrylic (B) particles, except that only 2% by mass of acrylic (B) particles are added. The antiglare layer coating material was prepared in the same manner as in Example 1, and an antiglare film was obtained in the same manner as in Example 1. Table 1 shows the evaluation results of the obtained antiglare film. As is apparent from Table 1, Comparative Example 2 does not contain acrylic (A) particles, and thus has an excellent anti-reflection function, but has a glare feeling and poor transmitted image clarity. It was.

(Examples 2-3)
In the antiglare layer coating material of Example 1, the antiglare layer coating material was changed in the same manner as in Example 1 except that the content ratio of the acrylic (A1) particles and the acrylic (B) particles was changed as shown in Table 1. And an antiglare film was obtained in the same manner as in Example 1. Table 1 shows the evaluation results of the obtained antiglare film. Examples 2 to 3 had good transparency of the transmitted image, no glare, and good anti-reflection function.

(Comparative Example 3)
In the antiglare layer coating material of Example 1, the hard coat (A) having the characteristics shown in Table 1 in the same manner except that the content ratio of the acrylic (A1) particles and the acrylic (B) particles was changed to 55:45. An antiglare film was obtained in the same manner as in Example 1 except that the layer was produced. Table 1 shows the evaluation results of the obtained antiglare film. As is clear from Table 1, Comparative Example 3 has a higher content ratio of acrylic (B) particles than Example 1, and thus has an anti-reflection function, but has a glare feeling and a transmitted image. The sharpness was inferior.

Example 4
A nickel layer (thickness 0) is formed on one side of an optically easy-adhesive polyester film (Lumirror (registered trademark) U46, manufactured by Toray Industries, Inc., thickness 100 μm) under a vacuum of 3 × 10 ⁻³ Pa at room temperature. .05 μm) was formed. Furthermore, a copper layer (thickness 3 μm) was formed thereon by a vacuum vapor deposition method at a room temperature and under a vacuum of 3 × 10 ⁻³ Pa. Thereafter, a photoresist layer is applied and formed on the surface of the copper layer, and the photoresist layer is exposed and developed through a square mesh pattern mask, followed by etching, and a line width of 10 μm and a line pitch of 250 μm. A conductive mesh having a height of 3 μm was prepared. Further, the surface and both side surfaces of the conductive mesh were subjected to blackening treatment (oxidation treatment) to produce an electromagnetic wave shielding film. On the conductive mesh of the electromagnetic wave shielding film produced above, the same antiglare layer paint as in Example 3 was applied with a microgravure coater so that the thickness after curing was 5 μm, dried at 80 ° C. 400 mJ / cm ² was irradiated for curing, an antiglare layer was formed on the conductive mesh, and a display filter was obtained. The evaluation results of the obtained display filter are shown in Table 1. In Example 4, the clearness of the transmitted image was good, there was no glare, and the anti-reflection function was also good.

(Example 5)
A square mesh pattern was printed on one side of an optically easy-to-adhesive polyester film (Lumirror (registered trademark) U46 manufactured by Toray Industries, Inc., thickness 100 μm) using a catalyst ink made of a palladium colloid-containing paste. Electroless copper plating is performed by dipping in an electrolytic copper plating solution, followed by electrolytic copper plating, and further by electrolytic plating of a Ni-Sn alloy, thereby producing a copper having a line width of 20 μm, a line pitch of 300 μm, and a height of 5 μm. An electromagnetic wave shielding film in which a mesh pattern was formed was produced. On the conductive mesh of the electromagnetic wave shielding film produced above, the same antiglare layer coating material as in Example 3 was applied with a microgravure coater so that the thickness after curing was 8 μm, dried at 80 ° C. 400 mJ / cm ² was irradiated for curing, an antiglare layer was formed on the conductive mesh, and a display filter was obtained. The evaluation results of the obtained display filter are shown in Table 1. In Example 5, the clearness of the transmitted image was good, there was no glare, and the anti-reflection function was also good.

(Example 6)
In the antiglare layer coating material of Example 1, the antiglare layer coating material was prepared in the same manner as in Example 1 except that 2% by mass of the added particles (A1) particles were changed to acrylic (A2) particles and added. Further, an antiglare film was obtained in the same manner as in Example 1. Table 1 shows the evaluation results of the obtained antiglare film. In Example 6, the clearness of the transmitted image was good, there was no glare, and the anti-reflection function was also good.

(Examples 7 to 8)
In the antiglare layer paint of Example 6, the antiglare layer paint was changed in the same manner as in Example 1 except that the content ratio of the acrylic (A2) particles and the acrylic (B) particles was changed as shown in Table 1. And an antiglare film was obtained in the same manner as in Example 6. Table 1 shows the evaluation results of the obtained antiglare film. In Examples 7 to 8, the transmitted image clarity was good, there was no glare, and the anti-reflection function was also good.

  Since the antiglare film provided with the antiglare layer of the present invention and the display filter using the antiglare layer are excellent in the reflection preventing function and the transmitted image clearness, for example, a large screen such as a PDP. It is suitable as an anti-glare film applied to the front filter and the like.

Sectional view of ellipsoidal fine particles (B) used in the present invention Length of aspect ratio of ellipsoidal particles (B) used in the present invention

Claims (9)

An antiglare layer comprising spherical fine particles (A) and ellipsoidal fine particles (B) in a resin in a mixing ratio of 62:38 to 95: 5 by mass ratio. The antiglare layer according to claim 1, wherein the spherical fine particles (A) have an average particle size of 0.1 μm or more and less than 10 μm. The antiglare layer according to claim 1 or 2, wherein an average particle size of the ellipsoidal fine particles (B) is 0.1 µm or more and less than 15 µm. The antiglare layer according to any one of claims 1 to 3, which has a thickness of 1 µm or more and less than 20 µm. The antiglare layer according to any one of claims 1 to 4, wherein the surface 10-point average roughness (Rz) is 0.5 µm or more and less than 5 µm. The antiglare layer according to any one of claims 1 to 5, wherein the center line average roughness (Ra) of the surface is 0.05 µm or more and less than 1 µm. The anti-glare film in which the anti-glare layer in any one of Claims 1-6 is provided in the at least single side | surface of the base film. A display-use filter comprising a conductive layer on a base film, and the antiglare layer according to claim 1 provided on the conductive layer. The display filter according to claim 8, wherein the conductive layer includes at least a conductive mesh.

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