JP2009066757A - Antiglare film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antiglare film with a protective layer exhibiting an excellent antiglare effect in addition to basic performance such as hardenability, scratch resistance, hardness, adhesiveness and transparency, formed on the surface of a transparent film. <P>SOLUTION: The antiglare film is formed by laminating the particle-containing protective layer on the surface of the transparent film, wherein the protective layer is obtained by curing a resin composition containing a floc with an average particle diameter of 50-600 nm, and has a maximum height roughness Ry of 1-3.2 μm on the surface and an image clarity of 18% or more. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an antiglare film, and more particularly to a laminated antiglare film in which a protective layer is adhered to a transparent film.

Conventionally, polycarbonate (PC), polymethyl methacrylate (PMMA) and the like have been widely used as molding materials for optical applications. For example, optical applications include application to various displays such as plasma display devices, liquid crystal display devices such as mobile phones, PDAs (personal digital assistants), and video cameras.
In order to be used suitably for such optical applications, a clearer image is displayed, and glare that occurs in the display image due to reflection or scattering of light incident on or emitted from the screen is suppressed. There is a strict demand for higher performance, such as the generation of iridescent moire called so-called Newton rings, which occurs due to the interference of light.
Various antireflection treatments, antiglare treatments, and the like have been taken for such high performance, but the present situation has yet to be obtained that satisfies all of these requirements.
JP-A-8-12787 JP-A-5-306378 JP 2002-275392 A

  An object of the present invention is to provide an antiglare film in which a protective layer capable of exhibiting an excellent antiglare effect is formed on the surface of a transparent film.

  The present inventors have conducted extensive research on the characteristics of various optical molding materials such as so-called antireflection films and antiglare films. As a result, the basics of low birefringence, low moisture absorption, high transparency, high heat resistance, etc. In addition to ensuring a certain characteristic, partial display unevenness such as so-called white blur and / or black floating, or unclear display of background image, non-uniform display such as glare and / or glare, Newton ring We found that there are mainly three types of defects called light interference, and it is necessary to eliminate them in a well-balanced manner. Furthermore, a specific resin composition containing specific particles on the surface of a transparent film made of cyclic polyolefin The protective layer is coated with an object, and the average particle diameter of the particles constituting the protective layer is adjusted to display a clear image, and the maximum height roughness R on the surface of the protective layer It has also been found that three problems that are in a trade-off relationship with each other, such as preventing interference of light by adjusting, and preventing uneven display such as glare by adjusting image clarity, can be solved. The present invention has been completed.

  That is, according to the present invention, it is an antiglare film constituted by laminating a particle-containing protective layer on the surface of a transparent film (excluding those made of a cyclic olefin resin), and the protective layer has an average particle size of 50 to 50. It is a layer obtained by curing a resin composition containing 600 nm aggregated particles, and has a maximum height roughness Ry of 1 to 3.2 μm on its surface and an image clarity of 18% or more. An antiglare film is provided.

  According to the present invention, by forming a protective layer using specific particles in combination with a resin composition, the adhesion can be improved and a hard coat function can be imparted to the transparent film. Moreover, light that tends to be generated when the transparency is increased while ensuring transparency by using aggregated particles having a specific average particle diameter and preventing partial display unevenness such as so-called white blurring and black floating. It can satisfy all of the properties that are in a trade-off relationship, effectively preventing Newton's ring due to interference, and sufficiently exhibiting good image clarity that prevents the phenomenon of image flickering and glare. .

The antiglare film of the present invention is mainly constituted by laminating a transparent film and a protective layer.
The transparent film is not particularly limited as long as it is a thin film having at least transparency, and various materials can be used. For example, polyester polymers (eg, polyethylene terephthalate, polyethylene naphthalate, etc.), unsaturated polyester polymers, cellulose polymers (eg, cellulose acetate (cellulose diacetate, cellulose triacetate, etc.), cellulose propionate, cellulose butyrate, Cellulose C _1-5 organic acid esters such as cellulose acetate propionate and cellulose acetate butyrate, cellulose ethers such as CMC (carboxymethyl cellulose), ethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, etc.], polycarbonate polymers, acrylic polymers ( For example, polymethyl methacrylate, etc.), styrenic polymers (eg, polystyrene, acrylonitrile)・ Styrene copolymers, styrene / methyl methacrylate copolymers, styrene / butadiene copolymers, etc.), olefin polymers (eg, polyethylene, polypropylene, ethylene / propylene copolymers, except for cyclic olefin polymers) , Vinyl chloride polymers (for example, polyvinyl chloride), amide polymers (for example, nylon and aromatic polyamide), imide polymers, sulfone polymers, polyurethane polymers, thermoplastic polyurethane polymers, polyether polymers, Polyether sulfone polymer, polyether ketone polymer, polyether ether ketone polymer, polyphenylene sulfide polymer, vinyl alcohol polymer (for example, polyvinyl acetal), vinylidene chloride poly -, Vinyl butyral polymer, arylate polymer, polyoxymethylene polymer, epoxy polymer, halogen-containing polymer, silicone polymer, organic acid vinyl ester resin (polyvinyl acetate, etc.), epoxy (meth) acrylate [epoxycyclohexenyl Epoxycyclo C _5-8 alkenyl (meth) acrylate such as (meth) acrylate, glycidyl (meth) acrylate, etc.], urethane (meth) acrylate, polyester (meth) acrylate, allyl glycidyl ether, diallyl phthalate and the like. These can be used alone or in combination of two or more. In addition, although a film rich in flexibility is preferable, plate-shaped films, such as a glass plate, may be sufficient.

The material of the protective layer is not particularly limited. For example, the protective layer is preferably formed of a resin composition that adheres to the above-described transparent film, is transparent, and can impart a protective function.
For example, melamine resin, urethane resin, acrylic resin, silicone resin and the like can be mentioned. In addition, these resins include polyarylate resins, sulfone resins, amide resins, imide resins, polyethersulfone resins, polyetherimide resins, polycarbonate resins, fluorine resins, polyolefin resins, styrene resins. A resin, vinyl pyrrolidone resin, cellulose resin, acrylonitrile resin, or the like may be mixed and used. Alternatively, from another point of view, an active energy ray-curable resin that cures directly or under the action of a photopolymerization initiator by ultraviolet rays or an electron beam, a mixture of an active energy ray-curable resin and a solvent-drying resin, thermosetting Examples thereof include resins. Of these, an active energy ray-curable resin is preferable.

Examples of the ultraviolet curable resin include acrylic urethane, polyester acrylate, epoxy acrylate, polyol acrylate, and epoxy resin.
Acrylic urethane resins generally react with polyester polyols with isocyanate monomers or prepolymers, and further with 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate (hereinafter referred to as acrylate, including methacrylate), 2- It can be produced by reacting an acrylate monomer having a hydroxyl group such as hydroxypropyl acrylate (for example, see JP-A-59-151110).

Polyester acrylate resins can be generally produced by reacting polyester polyols with 2-hydroxyethyl acrylate and 2-hydroxy acrylate monomers (for example, see JP-A-59-151112).
Examples of the epoxy acrylate resins include those obtained by reacting epoxy acrylate with an oligomer, a reactive diluent and a photoreaction initiator added thereto (for example, see JP-A-1-105738). As the photoreaction initiator, benzoin derivatives, oxime ketone derivatives, benzophenone derivatives, thioxanthone derivatives, and the like can be used.

    Examples of polyol acrylate resins include polyfunctional acrylate resins. Here, the polyfunctional acrylate resin is a compound having two or more acryloyloxy groups and / or methacryloyloxy groups in the molecule (see, for example, JP-A-2006-10923).

    Specific examples of the material for forming the protective layer include 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, tetraethylene glycol acrylate, 1,9-nonanediol diacrylate, tricyclodecane dimethanol diacrylate, neo Bifunctional acrylates such as pentyl glycol PO modified diacrylate, EO modified bisphenol A diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, ditrimethylolpropane tetraacrylate, dipentaerythritol hexaacrylate, trimethylolpropane EO modified tri Multifunctional like acrylate, PO-modified glycerin triacrylate, trihydroxyethyl isocyanurate triacrylate Crylate, etc., NK Oligo EA6310, 6320, 6340, NK Oligo U4HA, NK Oligo U24A, NK Oligo MA6 (manufactured by Shin Nakamura Chemical Co., Ltd.), Beam Set BS700, BS550B, BS575, BS575CB, BS371, BS374, BS-EM60, BS- EM-90 (made by Arakawa Chemical Co., Ltd.), purple light UV6300B (made by Nippon Synthetic Chemical Co., Ltd.), etc. are mentioned.

The ultraviolet curable acrylate resin may be added with a photopolymerization initiator as described later.
The active energy ray-curable resin composition contains a polyfunctional acrylic monomer, for example, (A) a polyfunctional monomer having a surface tension of 37 mN / m or less and having 3 or more acryloyl groups (hereinafter referred to as (A ) Component), (B) a polymer acrylate obtained by addition reaction of acrylic acid to a glycidyl (meth) acrylate polymer (hereinafter referred to as (B) component), and (C) optionally other acrylic oligomer (hereinafter referred to as “component”). You may use the active energy ray-curable resin composition formed by mix | blending (C) component) by specific amount.

  The surface tension of the component (A) is suitably in the range of 37 mN / m or less, more preferably 30 mN / m or more, from the viewpoint that sufficient hardness and adhesion can be obtained. The surface tension is measured by a vertical plate method (wilhemy method) using a Kyowa CBVP surface tension meter.

Specific examples of the component (A) include trimethylolpropane triacrylate, ditrimethylolpropane tetraacrylate, triacrylate of glycerin propylene glycol adduct, triacrylate of trimethylolpropane propylene glycol adduct, and the like. Is high in hardness, trimethylolpropane triacrylate and ditrimethylolpropane tetraacrylate are preferable.
The compounding amount of the component (A) in the active energy ray-curable resin composition is 40 to 60% by weight (however, the total of the components (A), (B), and (C) is 100% by weight). It is appropriate that it is 50 to 60% by weight.

  As described above, the component (B) is a polymer acrylate obtained by adding acrylic acid to a glycidyl (meth) acrylate polymer. The addition amount of acrylic acid to the epoxy group is suitably about 1: 1 to 1: 0.8 because unreacted epoxy adversely affects the stability of the composition, and 1: 1 to 1: 0.9. The degree is preferred.

  Examples of the glycidyl (meth) acrylate polymer include homopolymers of glycidyl (meth) acrylate, copolymers of glycidyl (meth) acrylate and various α, β-unsaturated monomers not containing a carboxyl group, and the like. It is done. Examples of the α, β-unsaturated monomer not containing the carboxyl group include various (meth) acrylic acid esters, styrene, vinyl acetate, acrylonitrile and the like. When glycidyl (meth) acrylate and an α, β-unsaturated monomer not containing a carboxyl group are copolymerized to obtain a glycidyl (meth) acrylate polymer, crosslinking occurs during the reaction. Therefore, high viscosity and gelation can be effectively prevented. The molecular weight of the glycidyl (meth) acrylate polymer is a weight average molecular weight of about 5,000 to 100,000 and 10,000 to 50 from the viewpoint of curling reduction during curing and prevention of gelation during the acrylic addition reaction. About 1,000 is preferable. (B) 70 weight% or more is suitable for the usage-amount of the glycidyl (meth) acrylate in a component in consideration of the hardness of a protective layer, the transferability of a polymer, etc., and 75 weight% or more is preferable.

A known copolymerization method can be applied to the production of the component (B). The production of the glycidyl (meth) acrylate polymer is carried out by charging this monomer, a polymerization initiator, and, if necessary, a chain transfer agent and a solvent into a reaction vessel, under a nitrogen stream at 80 to 90 ° C. for about 3 to 6 hours. It is appropriate to do in The resulting glycidyl (meth) acrylate polymer and acrylic acid can be subjected to a ring-opening esterification reaction to obtain the component (B). Usually, in order to prevent polymerization of acrylic acid itself, The reaction temperature is suitably 100 to 120 ° C., and the reaction time is suitably about 5 to 8 hours.
The blending amount of the component (B) in the active energy ray-curable resin composition is 10 to 60% by weight (provided that the total of the components (A), (B), and (C) is 100% by weight). It is suitable and 20 to 50% by weight is preferred.

  Specific examples of the component (C) include polyfunctional polyester acrylate, polyfunctional urethane acrylate, and epoxy acrylate. Of these, polyfunctional urethane acrylates are preferred from the viewpoints of scratch resistance and toughness of the cured coating film. For example, (a) a urethane reaction product of (meth) acrylate having a hydroxyl group and an isocyanate compound having two or more isocyanate groups in the molecule, and (b) an isocyanate compound having two or more isocyanate groups in the molecule. Examples include a reaction product obtained by reacting a polyol, polyester or polyamide-based diol to synthesize an adduct, and then adding a (meth) acrylate having a hydroxyl group to the remaining isocyanate group (for example, JP-A-2002-275392). Issue).

The polyfunctional urethane acrylate is a urethane reaction product composed of a (meth) acrylate having a hydroxyl group and a polyvalent isocyanate compound having two or more isocyanate groups. As the (meth) acrylate having a hydroxyl group, pentaerythritol tri (meth) acrylate, dipentaerythritol penta (meth) acrylate and the like are preferable.
The blending amount of the component (C) in the active energy ray-curable resin composition is suitably 0 to 50% by weight (however, the sum of the components (A), (B) and (C) is 100% by weight). ing.
The active energy ray-curable resin composition can be blended with an organic solvent in order to adjust the viscosity according to the individual application. As the organic solvent, those which do not dissolve the transparent film are suitable, and for example, ester solvents, alcohol solvents, and ketone solvents are preferable.

  As the active energy ray used for curing the active energy ray-curable resin composition, for example, any of ultraviolet rays, electron beams and the like may be used. When the resin composition is cured with an electron beam or the like, a photopolymerization initiator is not required, but when cured with ultraviolet rays, the photopolymerization initiator is usually 1 to 15 weights per 100 parts by weight of the resin composition. It is preferable to contain about a part. As a photoinitiator, it can select suitably by resin composition etc., For example, acetophenones (for example, 2, 2- dimethoxy acetophenone etc.), benzoins (for example, benzoin, benzoin methyl ether, etc.), benzophenones (For example, benzophenone, hydroxybenzophenone), α-amyloxime ester, phosphine oxides (for example, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, etc.), ketals, anthraquinones, thioxanthones, aromatic diazonium salts , Aromatic sulfonium salts, aromatic iodonium salts, metathelone compounds, onium salts, borate salts, active esters (eg, 1,2-octanedione, etc.), active halogens, inorganic complexes, coumarins (eg, 3-keto bears) Emissions, etc.) can be suitably selected from benzoin sulfonic esters. Moreover, you may mix and use a photosensitizer. Examples of the photosensitizer include n-butylamine, triethylamine, poly-n-butylphosphine and the like. In particular, in the resin composition comprising the components (A) to (C), Darocur 1173, Irgacure 651, Irgacure 184, Irgacure 907, Irgacure 754 (all manufactured by Ciba Specialty Chemicals), benzophenone Various known ones such as can be used.

If necessary, various additives other than those described above, for example, a polymerization inhibitor, an antioxidant, an ultraviolet absorber, an antistatic agent, a light stabilizer, a solvent, an antifoaming agent, a leveling agent and the like may be blended.
Examples of the solvent-drying resin used by mixing with the active energy ray curable resin include thermoplastic resins. Examples of the thermoplastic resin include cellulosic resins. Specific examples include nitrocellulose, acetylcellulose, cellulose acetate propionate, and ethylhydroxyethylcellulose.

  Thermosetting resins include phenolic resin, urea resin, diallyl phthalate resin, melanin resin, guanamine resin, unsaturated polyester resin, polyurethane resin, epoxy resin, aminoalkyd resin, melamine-urea cocondensation resin, silicon resin, polysiloxane Resins, vinyl ester resins, thermosetting polyimide resins, thermosetting polyamideimides, and the like can be given. Further, if necessary, a curing agent such as a crosslinking agent and a polymerization initiator, a polymerization accelerator, a solvent, a viscosity modifier and the like may be further added and used.

  The particles contained in the protective layer are not particularly limited, but may be any of those usually used as fillers, such as carbon black, copper, nickel, silver, iron, or a composite powder thereof; zinc oxide, tin oxide , Metal oxides such as titanium oxide, tin monoxide, calcium oxide, magnesium oxide, beryllium oxide, aluminum oxide, silica (fumed silica, fused silica, precipitated silica, ultra fine powder amorphous silica, crystalline silica, anhydrous silicic acid, etc.) Metal carbonates such as calcium carbonate, potassium carbonate, sodium carbonate, magnesium carbonate, barium carbonate; metal nitrides such as boron nitride, silicon nitride, and aluminum nitride; metal carbides such as SiC; aluminum hydroxide, magnesium hydroxide, etc. Metal hydroxides: aluminum borate, barium titanate, calcium phosphate , Calcium silicate, clay, gypsum, barium sulfate, mica, diatomaceous earth, white clay, talc, zeolites, pigments, and the like. Of these, silica is preferable. Specific examples include Aerosil 50, 90G, 130, 200, 200V, 200CF, 300, 380, R972, R972V, R974, RX200, R202, R805, R812S, and OX50 manufactured by Nippon Aerosil Co., Ltd.

  The primary average particle size of the particles used for forming the protective layer is not particularly limited, and for example, about 1 nm to 100 nm, about 1 nm to 50 nm, and further about 1 nm to 25 nm are suitable.

  On the other hand, the particles in the protective layer after formation show the form of secondary, tertiary or higher aggregated particles, and the average particle size is preferably about 50 to 600 nm, particularly about 50 to 400 nm, More preferably, it is about 50 to 200 nm. By having such an average particle diameter, the transparency of the resin composition can be secured and the haze value can be adjusted to an appropriate value. As a result, when the antiglare film of the present invention is arranged on the surface of a black background image, such as so-called white blur or black float, it is possible to effectively prevent the occurrence of a blurred whitish portion in the black background image. The background image can be projected clearly.

The protective layer is usually stirred or mixed so that the particles are mixed in the above-mentioned active energy ray-curable resin composition in a liquid or suspension state, and the particles are uniformly dispersed. At this time, by adjusting known parameters such as stirring method, stirring speed, stirring force, stirring time and the like, the distribution and agglomeration state of the particles can be controlled, and predetermined particles different from the primary particles used as the raw material are used. Agglomerated particles such as secondary particles having a diameter are formed, and a part of the agglomerated particles partially collapses or aggregates to form tertiary particles or the like. In the present invention, it is preferable that the average particle diameter is in the above-described range in the state where the protective layer is completed, regardless of the particle diameter of the particles before and during the formation of the protective layer. However, the average particle diameter in the state where the protective layer is completed is a value in the active energy ray-curable resin composition. At this time, the average particle diameter (d: hydrodynamic diameter) means a value obtained by a cumulant method from an autocorrelation function obtained by a photon correlation method. The autocorrelation function can be directly obtained from the temporal change of the scattering intensity, and the second-order autocorrelation function G2 (τ) is expressed by the following equation.
G ₂ (τ) = 1 + β | G ₁ (τ) | ²
(Where G ₁ (τ) is a first-order autocorrelation function and β is a constant)

When the particles are monodisperse, G ₁ (τ) becomes a single exponential decay curve and is expressed as follows using the decay constant Γ.
G ₁ (τ) = exp (−Γτ)
ln (G ₁ (τ)) = − Γτ

Further, Γ is expressed as follows using the diffusion coefficient D.
Γ = q ² D
q = (4πn ₀ / λ ₀ ) · sin (θ / 2)
(Where q is the scattering vector, n ₀ is the refractive index of the solvent, and λ ₀ is the wavelength of the laser light)

The average particle diameter d can be obtained from the diffusion coefficient D using the Einstein-Stokes equation.
d = kT / 3πη ₀ D
(Where d is the average particle size, k is the Boltzmann constant, T is the absolute temperature, and η ₀ is the viscosity of the solvent)
This average particle diameter can be measured by, for example, FPAR-1000 manufactured by Otsuka Electronics.

  In addition, since the particles have a small average particle diameter in the protective layer after formation, transparency in the protective layer can be ensured, while relatively large particles are dispersed in some places to effectively make Newton rings. While preventing, glare can be minimized. In particular, when applied to a display device such as a touch panel and a film or the like is further laminated on the surface of the antiglare film of the present invention, Newton's rings generated by contact with the film can be more effectively prevented.

  In the protective layer, the particles are preferably contained in an amount of about 10 to 30%, more preferably 17 to 22%, based on the total weight of the protective layer. As a result, unevenness such as white blurring and black floating can be prevented, and the background image can be clearly displayed. In addition, anti-Newton ring properties and glare can be prevented, and the three types of balance can be adjusted appropriately.

  The protective layer has a maximum surface roughness Ry (μm) of about 1.0 to 5 μm, about 1.0 to 4 μm, particularly about 1.0 to 3.2, and about 1.8 to 3.2. 2.0 to about 3.2 and about 2.0 to 2.6 are more preferable. By adjusting to such a maximum height roughness, the anti-Newton ring property can be effectively exhibited in combination with the above-mentioned average particle diameter of particles and / or the content ratio of relatively large particles. The surface height roughness Ry is the sum of the maximum value of the peak height of the contour curve and the maximum value of the valley depth at the reference length specified in JIS B0601'94. The maximum height roughness Ry can be measured using, for example, a surface roughness shape measuring machine, Handy Surf E-35A (manufactured by Tokyo Seimitsu Co., Ltd.).

  For example, in order to realize the above-mentioned surface height roughness (Ry), for example, in the protective film after formation, the maximum particle size Rm is usually about 30 μm or less, preferably about 20 μm or less, particularly about 10 μm or less. It is preferable. From another viewpoint, it is preferable that the particles having a particle diameter of 1300 nm or more are 1.5 to 7%, more preferably 1.5 to 5%, particularly 2.0 to 5% of all particles. % Is preferred. As described above, the generation of the Newton ring described above can be more reliably prevented by containing a specific relatively large particle diameter within this range. Further, particles having a relatively large particle size are effective for preventing glare, which will be described later. However, if too many particles are contained, glare may be manifested. Therefore, the balance can be achieved so that the effects of anti-Newton ring and glare prevention can be maximized.

  The protective layer preferably has an image clarity of about 18% or more, and more preferably about 20% or more, about 30% or more, about 40% or more, or about 45% or more. Here, the image clarity is a so-called glare, that is, an index representing the degree of discomfort caused to the observer due to light scattering, etc. When this value is large, the image clarity is good and the glare, etc. Means that it is hard to occur. Specifically, it indicates the ratio of light passing through a slit in an optical comb having a slit (interval) of a predetermined width, and for example, it is measured using a clarity measuring machine ICM-1T (manufactured by Suga Test Instruments). Can do. In the present invention, an optical comb having an interval of 0.5 mm is used. This glare is likely to appear when a protective layer is formed by interspersing particles having a relatively large particle size among particles having a uniform particle size. Therefore, in order to prevent this, it is conceivable to uniformly disperse particles having a small particle size without including particles having a relatively large particle size. However, in this case, Newton rings are likely to occur. Therefore, it is necessary to balance parameters so as to minimize the occurrence of both. In the present invention, by adjusting the image clarity together with the average particle diameter of the particles and the maximum height roughness Ry in the protective layer, All the factors that are trade-offs to each other can be satisfied.

  The protective layer preferably has a haze value of about 12% or less, more preferably about 10% or less, and particularly preferably 5% or less. The haze value is also called haze value, and represents the degree of haze and the degree of diffusion. By setting this value in the above-described range, so-called white blur can be prevented. The haze value is related to the average particle size, particle size distribution, etc. of the particles contained in the protective layer. Therefore, the background image can be displayed more clearly in combination with the average particle diameter and / or the content ratio of relatively large particles.

  As described above, the protective layer of the present invention is prepared by mixing particles with a resin composition, and optionally preparing a liquid or suspension using an appropriate organic solvent, etc., and applying / drying this to a transparent film. It can be formed by irradiating with active energy rays. As the coating method of the active energy ray-curable resin composition, bar coater coating, air knife coating, gravure coating, gravure reverse coating, reverse roll coating, lip coating, die coating, dip coating, Various methods such as offset printing, flexographic printing, and screen printing can be employed. Irradiation of the active energy ray is not particularly limited, and may be appropriately adjusted by a method known in the art depending on the composition of the resin composition to be used, the type of active energy ray, the thickness of the resin composition, and the like. Can do. Although the film thickness of a protective layer is not specifically limited, Usually, it is preferable about 1-20 micrometers, it is more preferable that it is about 1-10 micrometers, More preferably, it is about 1-5 micrometers.

  In the antiglare film of the present invention, the active energy ray-curable resin composition (which may optionally contain the filler described above) is further provided on the surface opposite to the surface on which the particle-containing protective layer of the transparent film is formed. It is preferable that the back surface protective layer which consists of is formed. In this case, the film thickness of the back surface protective layer is not particularly limited, and examples thereof include the same film thickness as the above protective layer. Thus, by providing a protective layer on both surfaces, warping of the film can be prevented.

  The surface of the protective layer preferably has a pencil hardness of HB or higher, more preferably F or higher, and H or higher. Thereby, sufficient surface hardness as a protective layer can be maintained. Further, it is preferable that 10 or less scratches are generated when the surface of the protective layer is rubbed 10 times with steel wool at a load of 500 g, and it is particularly preferable in terms of surface hardness that no scratches are generated.

  Further, a conductive layer or a deflecting plate may be further formed on the transparent film via the particle-containing protective layer (and / or via the back surface protective layer described above). By forming these, a further function can be imparted to the antiglare film of the present invention, and it can be used for various applications.

  The conductive layer may be any material and aspect used for optical applications, and is particularly preferably transparent. For example, it can be formed of indium-tin composite oxide (ITO), tin oxide, gold, silver, palladium, copper, aluminum, nickel, chromium, titanium, cobalt, tin, or the like. These can be formed by, for example, a PVD method such as a sputtering method, a vacuum deposition method, or an ion plating method, a CVD method, a coating method, a printing method, or the like. Before forming the conductive layer, an undercoat layer or the like may be provided in order to improve transparency, optical properties, or the like. In order to improve adhesion, for example, between the undercoat layer and the film. A metal layer made of a single metal element or an alloy of two or more metal elements may be provided. The metal layer can be formed of silicon, titanium, tin, zinc, or the like.

  The deflecting plate may be any material as long as it is used for optical applications. For example, polyvinyl alcohol film, partially formalized polyvinyl alcohol film, ethylene / vinyl acetate copolymer system partially saponified film and other hydrophilic polymer films that are stretched by adsorbing iodine or dye, etc., dehydration of polyvinyl alcohol Examples include treated products and polyvinyl chloride dehydrochlorinated products.

  When the antiglare film of the present invention is used for, for example, a touch panel, a conductive layer made of ITO, a particle-containing protective layer, a transparent film, a particle-containing or non-containing protective layer, an adhesive layer, and a deflecting plate in this order, or A conductive layer made of ITO, a particle-containing protective layer, a transparent film, a particle-containing or non-containing protective layer, an adhesive layer, and a liquid crystal layer can be laminated in this order.

Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples. All “parts” are based on weight.
Examples 1 and 2
UV curable resin composition (adjusted to 80% solid content with ethyl acetate, beam set 371, manufactured by Arakawa Chemical Co., Ltd.) 65.1 parts methyl ethyl ketone (MEK) 25.8 parts silica (aerosil (average particle size: about (12 nm), manufactured by Nippon Aerosil Co., Ltd.) 9.17 parts The above ingredients were mixed in an open drum for stirring (inner diameter: about 40 cm, inner height: 58 cm), and stirred with a wing having a diameter of about 11 cm for 150 minutes. Then, it diluted with MEK and obtained the coating material for protective layers of 40% of solid content.

The obtained paint was applied by a gravure reverse method to various transparent films (film thickness: about 100 μm) shown in Table 1 at an application amount of 8 g / m ² . The film was dried at 80 ° C. for 60 seconds, irradiated with ultraviolet rays of 150 mJ / cm ² and cured to form an antiglare film having a protective layer with a thickness of 4 μm.

Comparative Examples 1 and 2
A coating material was prepared in the same manner as in Example 1 except that each component of Example 1 was stirred for 30 to 45 minutes with a roll mill, and various films shown in the table were used to prevent the film from having a protective layer with a thickness of 4 μm. A dazzling film was formed.

Comparative Examples 3 and 4
A coating material was prepared in the same manner as in Example 1 except that the compounding ingredients of Example 1 were stirred so that silica was overdispersed for 210 minutes, and using this, various films shown in the table had a thickness of 4 μm. An antiglare film having a protective layer was formed.

The following evaluation was performed about the obtained anti-glare film. The results are shown in the table.
(Average particle size)
It measured using FPAR-1000 made from Otsuka Electronics, and calculated the average particle diameter by the cumulant analysis.
(Maximum particle size)
It measured using FPAR-1000 made from Otsuka Electronics, and calculated the maximum particle size by cumulant analysis.
(Measurement of haze value)
Based on JIS-K7361-1 (ISO13468-1), it measured using the Nippon Denshoku Industries Co., Ltd. NDH2000 haze meter, and computed with the following formula | equation.
Haze value (%) = diffuse transmittance (%) / total light transmittance (%)

(White blur evaluation)
Black tape is pasted on the back side of the protective layer, visually observed with a three-wavelength fluorescent lamp, ◎ has almost no whiteness on the surface, ○ has little whiteness on the surface, but there is no practical problem, △ indicates the surface Rated as clearly white.
(Measurement of maximum height roughness Ry)
Based on ISO "97 / JIS '01, it measured using the maximum height roughness shape measuring machine (HANDYSURF E-35A by Tokyo Seimitsu Co., Ltd.).
(Anti-Newton ring evaluation)
Place a glass plate on a black mount under a three-wavelength fluorescent lamp and visually observe the interference unevenness when the coating surface is pressed with a finger. ◎ indicates no interference unevenness, ○ indicates interference unevenness Was evaluated as having a slight interference, and Δ indicating that interference unevenness was visible.

(Evaluation of image clarity)
An optical comb having an interval of 0.5 mm was applied to an image clarity measuring instrument ICM-1T (manufactured by Suga Test Instruments Co., Ltd.), and light (%) transmitted from the optical comb interval was measured.
(Glare evaluation)
The glare evaluation was performed by visually observing the glare of the image using a display having a resolution, horizontal of 1280 dots, and vertical of 1024 lines, and evaluated that there was almost no glare, ○ had little glare, and Δ had glare. .

(Adhesion evaluation)
According to the JIS grid pattern method (25 grid pattern), 25 square grids of 2 mm square were formed on the protective layer using a cutter, the area was peeled off with cellophane tape, and the number of grids remaining was evaluated. ○ was 25/25, and x was 23/25 or less.
(Steel wool resistance evaluation)
Apply a load of 500 g to 1 cm square # 0000 steel wool and visually observe the degree of scratching on the surface after 10 reciprocations at a movable distance of 2 cm. evaluated.

The present invention relates to various optical devices, specifically from various displays such as word processors, computers, televisions, display panels, mobile phones, and the like, polarizing plate surfaces used in liquid crystal display devices, touch panel surfaces, and transparent plastics. It can be used as an anti-glare film for optical lenses such as sunglasses lenses, prescription glasses lenses, camera finder lenses, display parts of various instruments, window glass of automobiles, trains, optical filters, functional films, and the like.

Claims (6)

An anti-glare film comprising a particle-containing protective layer laminated on the surface of a transparent film (excluding those made of a cyclic olefin resin),
The protective layer is a layer obtained by curing a resin composition containing aggregated particles having an average particle size of 50 to 600 nm,
An anti-glare film having a maximum height roughness Ry of 1 to 3.2 μm on its surface and an image clarity of 18% or more.   The antiglare film according to claim 1, wherein the protective layer exhibits a haze value of 12% or less.   The antiglare film according to claim 1 or 2, wherein the protective layer is formed by containing particles having a particle diameter of 1300 nm or more in an amount of 1.5 to 7% of all particles.   The antiglare film according to any one of claims 1 to 3, wherein the protective layer is formed by containing particles in an amount of 10 to 30% by weight with respect to the total protective layer.   The antiglare film according to any one of claims 1 to 4, wherein a back surface protective layer is further formed on the surface opposite to the surface on which the particle-containing protective layer of the transparent film is formed. The antiglare film according to any one of claims 1 to 5, wherein a conductive layer or a deflecting plate is further formed on the transparent film via a particle-containing protective layer.