JP2004341553A - Antidazzle film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an easier-to-see surface screen by improving optical characteristics of an antidazzle film used for surfaces of various displays of a word processor, a computer, a television, an on-vehicle instrument, etc. <P>SOLUTION: The antidazzle film for display is composed of a transparent film and an ionizing radiation setting type resin layer which is provided on the transparent film and has optical characteristics of ≥85% total light-beam transmissivity, a 3.0 to 35% haze degree, and 60° glossiness is 90% or lower and further has 0.05 to 0.25 μm of surface center-line mean roughness and a 5 to 150 μm surface unevenness pitch. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a type having a light source behind a screen such as a liquid crystal display, a CRT display, etc., such as various displays such as a word processor, a computer, a television, and an in-vehicle instrument panel. It is about a film.

  As the film used for the surface of the display, it is located on the outermost surface of the display, so it can be touched directly by hands, wiped with various chemicals including synthetic detergents, and may be exposed to sunlight, A specific coating is applied to the base film to impart abrasion resistance, chemical resistance, weather resistance, and the like. Further, in order to make the screen displayed on the display easier to see, anti-glare properties and other required performances are satisfied, the following various processes or processes are performed.

  For example, as disclosed in JP-A-59-151110, it is known to provide an antiglare effect by forming a concavo-convex shape on the surface or mixing a matting agent into a hard coat. In these methods, the 60-degree glossiness can be reduced by increasing the haze, but in contrast, this method may decrease the total light transmittance and the screen resolution.

In addition, in order to provide a high-precision, high-haze, low-gloss antiglare effect for use in a TET color display, a method of adding a large amount of a fine powder light diffusing agent to an antiglare film has been proposed. Proposed. However, when the amount of the light diffusing agent is increased, the suitability for coating is reduced, which causes streaks on the coated surface and lowers the yield. Furthermore, when such an antiglare film is applied to a polarizing plate, there is a problem that the quality of the polarizing plate is deteriorated.
JP-A-59-151110

  The present invention provides an antiglare film in which, when an image on a display surface is viewed, the displayed characters and other images have a good resolution and a clear contrast without feeling glare. It is intended to be.

  In order to achieve the above object, an antiglare film according to the present invention comprises a transparent film, a total light transmittance of 85% or more, a haze degree of 3.0 to 35%, and a degree of 60 degrees provided on the transparent film. An ionizing radiation-curable resin layer having an optical characteristic of a glossiness of 90% or less, a surface center line average roughness of 0.05 to 0.6 μm, and a surface roughness of 5 to 200 μm in pitch between surface irregularities. It is characterized by becoming.

  The antiglare film according to the present invention has a transparent film and optical properties provided on the transparent film, having a total light transmittance of 85% or more, a haze of 3.0 to 35%, and a 60 ° gloss of 90% or less. And an ionizing radiation-curable resin layer having a surface center line average roughness of 0.05 to 0.6 μm and a surface roughness of 5 to 200 μm.

  The higher the total light transmittance, the brighter the display is, and the better the display is. However, in the present invention, it has been found that if the total light transmittance is 85% or more, it can be used practically without any problem.

  It is necessary that the haze degree be in the range of 3.0 to 35% in order to obtain a good screen. If the haze exceeds the upper limit of the above range, the display screen looks whitish, and if it is less than the lower limit, the gloss increases and the antiglare effect sharply decreases.

  The 60-degree gloss is a value defined by the reflection of light incident on the screen from the outside. If this value exceeds 90%, the glare increases, and the object of the present invention is not met.

  In addition, the numerical range of the pitch between the surface irregularities and the surface roughness is a necessary condition in the present invention for obtaining the appropriate physical properties of the total light transmittance, the haze, and the 60-degree gloss.

  The above-mentioned 60-degree glossiness can be measured based on the method specified in JIS Z8741. As shown in FIG. 2, light P0 is applied to the uneven surface 2 at an incident angle of 60 degrees and reflected. The light receiving ratio of the light P1 is a value expressed in%. On the other hand, the total light transmittance can be measured based on the method specified in JIS K6714. As shown in FIG. 2, the light reception ratio of the transmitted light Q1 with respect to the reflected light Q0 is expressed in%. Value.

  Further, in the present invention, as an antiglare film particularly suitable for a display for high definition, it is preferable to control the surface center average roughness in the range of 0.05 to 0.4 μm among the above surface properties, More preferably, it is in the range of 0.05 to 0.25. Here, “high definition” means that the number of pixels per unit area is increased, for example, 640 × 480 pixels are further increased to 800 × 600 pixels in a 26 cm diagonal panel.

  As the transparent film, for example, a TAC (triacetylcellulose film) having a thickness of about 80 μm is mainly used for a polarizing plate, but is appropriately selected from other known transparent plastic films. be able to. Examples of the transparent plastic film include the following. Examples include polyester film, polyethylene film, polypropylene film, polyvinyl chloride film, acetylcellulose butyrate film, polystyrene film, polycarbonate film, polymethylpentene film, and polysulfone film.

  As the resin for forming the hard coat layer, an acrylic urethane-based ionizing radiation-curable resin or the like, which is often used, is a resin having a property of curing by UV / EB, and Adhesive and durable ones are selected.

  As a light diffusing agent to be used when producing a high haze antireflection film, silica beads or acrylic beads of 0.5 to 5 μm are mainly used. In the case of a transparent resin that does not contain any light diffusing agent, the one that gives the optical function entirely by the light diffusing agent may appear whitish in contrast to the appearance of whitish. It is desirable to mix a light diffusing agent to such an extent that the suitability is not lost. When the light diffusing agent is kneaded with the ionizing radiation-curable resin, the light diffusing agent is kneaded in an organic resin to coat the surface of the light diffusing agent to ensure transparency and wettability.

  The light diffusing agent having been subjected to the organic coating treatment is dispersed in the ionizing radiation-curable resin. The content of the light diffusing agent is not more than 10 parts by weight based on 120 parts of the ionizing radiation-curable resin. good.

  Further, it is also effective to limit the particle size to exhibit good properties as the light diffusing agent. Silica beads having an organic coating treatment and having a particle size of 0.5 to 5 μm are: Excellent effect was shown.

  In the present invention, the ionizing radiation-curable resin to be used is not particularly limited as long as it is a resin that is cured by ionizing radiation called UV / EB. Examples of the ultraviolet-curable resin used together with the photosensitizer include an ultraviolet-curable acrylic urethane-based resin, an ultraviolet-curable polyester acrylate-based resin, and an ultraviolet-curable epoxy acrylate-based resin.

  For example, an ultraviolet-curable acrylic urethane-based resin is obtained by reacting a polyester polyol with an isocyanate monomer or a prepolymer, and reacting the obtained product with an acrylate or methacrylate-based monomer having a hydroxyl group. As the photopolymerization initiator, benzophenone derivatives, acetophenone derivatives, anthraquinone derivatives and the like can be used alone or in combination.

  The ionizing radiation-curable resin may be appropriately selected and blended with a component for further improving the film formation, for example, an acrylic resin. In addition, a viscosity modifier, a solvent and the like are blended to form a coating liquid.

  As described above, for forming a liquid composition containing an ionizing radiation-curable resin as a main component on a base film, as a means for coating the ionizing radiation-curable resin, roll coating, reverse coating, gravure It can be carried out by a general coating method such as a coat or a slot orifice coat.

The coating amount is a coating amount after removing the solvent, and is 1 to 20 g / m ² , preferably 5 to 15 g / m ² .

  Next, the steps of the present invention will be described. The transparent film is coated with the coating liquid containing ionizing radiation-curable resin as a main component, applied, after drying the solvent, having flexibility, and at least, a molding film having fine irregularities on one surface thereof, The dried coating surface, the uneven surface is superimposed, through a transparent film, or through a shaping film, irradiated with ultraviolet light, after curing the ionizing radiation-curable resin, peeling off the shaping film, uneven To the surface of the coat layer.

  The above-mentioned coating liquid may be applied to the uneven surface of the shaping film, and after drying the solvent of the coating liquid as described above, a transparent film is superimposed. Follow the same procedure.

  The performance of the thus obtained film as a scratch-resistant antiglare film falls within the following range of physical properties, and is extremely useful in practice.

In the present invention, the optical properties of the antiglare film can be further improved by further forming an antireflection layer made of a metal compound on the surface of the ionizing radiation-curable resin layer. As such an antireflection layer, for example, a vapor deposition layer of a metal compound such as Al ₂ O ₃ , ZnO _2, and MgF ₂ can be used. , For example, _Al 2 _{O 3} about 1400 Å, ZnO ₂ to about 2800 _angstroms, may also be provided an antireflection layer by sequentially providing a deposited layer of MgF 2 1400 angstroms.

Use of shaped film Next, in obtaining the above-mentioned present invention, describes another embodiment for the film surface to a desired state.

  That is, in this embodiment, the surface of the imprint film is formed into a desired uneven shape by coating the imprint film with one layer of resin, whereby the haze and gloss are low, and the anti-glare effect has high scratch resistance and chemical resistance. An antiglare film having excellent properties can be obtained.

  That is, in this method, a resin is applied to a matted film provided with an uneven shape on the film surface to form a shaped film in which the film surface is improved to a desired uneven shape, and the base film is formed using the shaped film. Is formed on the ionizing radiation-curable resin layer formed on the substrate film to form a concavo-convex shape on the surface of the base film.

  In still another embodiment, a matte film having a roughened surface formed on a film is coated with a resin to improve the film surface to a desired roughened shape, and then the shaped film is coated with an ionizing radiation-curable resin. After laminating on the ionizing radiation-curable resin-coated surface of the base film and irradiating ionizing radiation from the forming sheet side or the base side of the laminated film to cure the ionizing radiation-curable resin, the forming film is peeled off Thus, a predetermined antiglare film can be obtained.

  Next, in the above-mentioned manufacturing method, the imprinting film coated with the resin is formed into a matted film by coating a transparent resin or a resin to which fine particles having a particle size of 0.5 to 10 μm are added to form an uneven shape. And the ionizing radiation-curable resin may be an ultraviolet-curable resin, and the ionizing radiation may be ultraviolet light.

  Further, the surface roughness of the shaping film is preferably 0.1 to 10 μm in terms of center line average roughness (Ra).

  Then, in the above manufacturing method, after the imprinting film is peeled off, the ionizing radiation-curable resin is cured again by irradiating the ionizing radiation to form an antiglare film having improved scratch resistance and chemical resistance. it can.

  According to the above method, the surface of the imprinted film can be formed into a desired uneven shape by coating the matted imprinted film base material with a single layer of resin, and therefore, the haze and gloss are low, and the antiglare effect is obtained. It is possible to produce an antiglare film having excellent scratch resistance and excellent chemical resistance.

  FIG. 3 is a schematic cross-sectional view showing an example of an anti-glare film manufactured using a shaping film.

  FIG. 4A is a cross-sectional view of a matted shaped film base material, and FIG. 4B is a cross-sectional view of a matted shaped film base material provided with a coating resin layer.

  FIGS. 5A to 5D are explanatory diagrams when an antiglare film is manufactured using a shaping film provided with a coating resin layer.

  FIG. 6A is a cross-sectional view of a molding film prepared by coating a resin obtained by adding fine silica to a matted molding film substrate, and FIG. 6B is an antiglare film produced using the molding film of FIG. 6A. FIG.

Hereinafter, an example in the case of producing the antiglare film of the present invention will be described.
First, as shown in FIG. 4A, a film having good dimensional stability, such as a polyethylene terephthalate (hereinafter referred to as PET) film, is formed into a concavo-convex shape by embossing, sandblasting or the like, and is matted. Make a mold film base.

  Next, as shown in FIG. 4B, a thermosetting resin or an ionizing radiation-curable resin is coated on the uneven surface of the shaping film substrate 11 to form a coating resin layer 12, and the uneven surface is formed. By adjusting the roughness, a shaped film 20 having a desired surface roughness is obtained.

  When making an anti-glare film using the shaping film, a transparent, heat-resistant and dimensional-stable film such as a triacetyl cellulose film is used as the base material 14 of the anti-glare film. The base material 14 is coated with an ionizing radiation-curable resin to form an ionizing radiation-curable resin layer 13a before curing, as shown in FIG. 5B. Next, on the ionizing radiation-curable resin layer 13a before curing of the film, the concavo-convex surface of the shaping film 20 is superimposed to form the concavo-convex shape on the ionizing radiation-curable resin layer as shown in FIG. Shape it. Ionizing radiation is irradiated from the imprint film side of the laminated sheet to cure the ionizing radiation curable resin layer.

  After the ionizing radiation-curable resin layer is sufficiently cured, as shown in FIG. 5B, the shaping film is peeled off from the laminated sheet to produce the antiglare film 10 having the unevenness formed on the surface of the base film.

  When the ionizing radiation-curable resin is cured with ionizing radiation, the resin may be cured by irradiating the resin with ionizing radiation from the opposite side.

  In addition, when using ultraviolet rays as ionizing radiation, the ultraviolet rays are irradiated from the side of the imprinting film, and after curing the ultraviolet curable resin, the shaping film is peeled off and irradiated with ultraviolet rays again to increase the crosslink density, In some cases, the antiglare film has improved solvent resistance and scratch resistance.

  In addition, when forming a shaped film, a matted shaped film substrate is coated with a resin to which fine particles having a particle size of 0.5 to 10 μm are added, and a shaped film as shown in FIG. 6A is prepared. Using this, an anti-glare film is produced, and an anti-glare film having a high anti-glare effect as shown in FIG. 6B can be obtained.

  The base film used in the above-mentioned imprinting film may be any one that has dimensional stability and heat resistance and transmits ionizing radiation. Since ultraviolet light such as a high-pressure mercury lamp is often used as ionizing radiation, a transparent PET film can be preferably used as the base film. Although a thickness of 10 to 200 μm can be used, the thickness is desirably about 25 μm in consideration of production, reuse, cost, and the like of the shaped film. However, when an electron beam is used as ionizing radiation, any film may be used as long as it transmits the electron beam, and the film need not necessarily be transparent.

  As the resin to be coated to adjust the roughness of the shaping film, generally, a thermosetting resin or an ionizing radiation-curable resin is used, but is applied to the surface of the antiglare film. The ionizing radiation-curable resin can be used as long as it can form a predetermined uneven shape on the ionizing radiation-curable resin layer without softening or swelling, and is not particularly limited. A thermoplastic resin can also be used in combination with the type of ionizing radiation-curable resin.

  Examples of the thermosetting resin to be coated on the molding film include phenol resin, urea resin, diallyl phthalate resin, melamine resin, guanamine resin, unsaturated polyester resin, polyurethane resin, epoxy resin, amino argide resin, melamine-urea cocondensation Resins, silicon resins, polysiloxane resins, cellulose acetate propionate, etc., and if necessary, additives such as a crosslinking agent, a curing agent such as a polymerization initiator, a polymerization accelerator, a solvent, a viscosity modifier, an extender, etc. Added.

  As the curing agent, isocyanate is usually used for unsaturated polyester resin or polyurethane resin, and peroxide such as methyl ethyl ketone peroxide and radical initiator such as azoisobutyronitrile are often used for unsaturated polyester. Further, as the isocyanate as a curing agent, divalent or higher valent aliphatic or aromatic isocyanate can be used.

  An ionizing radiation-curable resin is also used as a coating resin. Since the ionizing radiation-curable resin is used for producing an antiglare film, it will be described in detail in the section of the antiglare film.

  The substrate film used for the anti-glare film may be any film as long as it is transparent, has dimensional stability and heat resistance, and transmits ionizing radiation. When used for display devices such as LCDs, CRTs, and LEDs, triacetyl cellulose films are often used.

  When the ionizing radiation-curable resin applied to the base film is cured, ultraviolet rays such as a high-pressure mercury lamp are often used as the ionizing radiation. Therefore, a film that transmits ultraviolet rays is usually used. In the case where is cured by irradiating ultraviolet rays only from the molding film side, it is not always necessary to transmit ultraviolet rays.

  Although a thickness of 10 to 200 μm can be used, it is preferably about 80 μm in consideration of workability, cost, and the like.

  As the ionizing radiation-curable resin that forms an uneven shape on the surface of the antiglare film, an ultraviolet-curable resin or an electron beam-curable resin is usually used.

  As the ionizing radiation-curable resin, a (meth) acryloyl group, a (meth) acryloyloxy group ((meth) acryloyl is used in the meaning of acryloyl or methacryloyl in the molecule, and hereinafter (meth) has the same meaning) And the like. A composition in which a prepolymer, an oligomer, and / or a monomer having a polymerizable unsaturated bond or an epoxy group, such as), is appropriately mixed is used.

  Examples of these prepolymers and oligomers include acrylates such as urethane (meth) acrylate, polyester (meth) acrylate, and epoxy (meth) acrylate; silicon resins such as siloxane; unsaturated polyesters and epoxies.

  Examples of the monomer include styrene monomers such as styrene and α-methylstyrene, methyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, pentaerythritol (meth) acrylate, dipentaerythritol hexa (Meth) acrylate, dipentaerythritol penta (meth) acrylate, trimethylolpropane tri (meth) acrylate, and / or a polyol compound having two or more thiol groups in a molecule, for example, trimethylolpropane trithioglycolate , Trimethylolpropane trithiopropylate, pentaerythritol tetrathioglycol and the like.

  The above compounds may be used alone or in combination of two or more, if necessary. In order to impart ordinary coating suitability to the resin composition, the prepolymer or oligomer is added in an amount of 5% by weight or more, And / or 95% by weight or less of polythiol.

  When the flexibility of the cured product is required at the time of selecting the monomer, the amount of the monomer may be reduced or the monofunctional or bifunctional acrylate monomer may be used within a range that does not affect the coating suitability. A structure with a relatively low crosslink density is used.

  Further, when the heat resistance, hardness, solvent resistance, etc. of the cured product are required, the amount of the monomer may be increased within a range that does not impair the coating suitability, or a trifunctional or higher functional acrylate monomer may be used. It is preferred to use a high crosslink density structure.

  By mixing monofunctional and difunctional monomers and trifunctional or higher functional monomers, it is also possible to adjust coating suitability and physical properties of the cured product.

  Examples of the monofunctional acrylate monomer as described above include 2-hydroxyacrylate, 2-hexyl acrylate, and phenoxyethyl acrylate.

  Examples of bifunctional acrylate monomers include ethylene glycol diacrylate and 1,6-hexanediol diacrylate. Examples of trifunctional acrylate monomers include trimethylolpropane triacrylate, pentaerythritol tetraacrylate, and pentaerythritol triacrylate. And dipentaerythritol hexaacrylate.

  When the ionizing radiation-curable resin is cured with ultraviolet rays, it is necessary to use a transparent resin. In addition, as the photopolymerization initiator in the ionizing radiation-curable resin composition, acetophenones, benzophenones, Michler benzoyl benzoate, α-amyloxime ester, tetramethylmeuram monosulfide, thioxanthone, and / or photosensitization As an agent, n-butylamine, triethylamine, tri-n-butylphosphine and the like can be mixed and used.

  In the present invention, ionizing radiation irradiation is used as a method for completely curing a resin composition containing an ionizing radiation-curable resin applied to an antiglare film substrate.

  On the resin layer formed on the base material, after superimposing the imprinting film and shaping the resin layer into an irregular shape, the resin layer is completely cured by irradiating with ionizing radiation such as ultraviolet rays and electron beams. .

  In the case where ultraviolet rays are used as ionizing radiation, if one irradiation from the top of the imprinting film does not cure sufficiently, after exfoliating the imprinting film, ultraviolet rays are again irradiated and the resin layer is completely cured.

  As the ionizing radiation irradiation device, an ultraviolet irradiation device or an electron beam irradiation device is usually used.

  For example, a light source such as an ultra-high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc, a black light, and a metal halide lamp is used as an ultraviolet irradiation device.

  As the electron beam source, various electron beam accelerators such as Cockloft-Wald type, Bande graph type, Resonant transformer type, Insulated core transformer type or linear type, Dynamitron type and high frequency type are used, and 100 to 1000 KeV, preferably 100 Irradiate with electrons having energy of ~ 300 KeV. The irradiation dose is usually about 0.5 to 30 KGy (kilo gray).

Production of a transparent protective substrate having an antiglare film and a polarizing plate A conventional transparent protective substrate having an antiglare property is provided with a coating film made of a resin composition containing amorphous silica on the surface. This amorphous silica is obtained by applying a paint containing amorphous silica to the surface of the transparent substrate in order to impart antiglare properties to the surface of the transparent protective substrate. In order to provide the anti-glare property, silica is blended at about 2 parts by weight with respect to 100 parts by weight of the resin. In the case of using a triacetate film for the transparent substrate, when the saponification treatment is performed on the coating containing silica for the purpose of improving the adhesion and preventing static electricity, the value indicating the haze value of the obtained triacetate film increases, The film had reduced resolution, contrast, and transparency. Here, the haze value is a value represented by diffuse transmittance / total light transmittance, and indicates a ratio of diffused light among transmitted light.

  Thus, in the present embodiment, a method for producing a transparent protective substrate having excellent anti-glare properties and excellent transparency as well as excellent resolution, contrast, surface hardness, and solvent resistance, is obtained by the method. Provided is a transparent protective substrate obtained, and a polarizing plate using the transparent protective substrate.

  Further, in the present embodiment, particularly when an acetylcellulose-based film is used as the transparent substrate, the haze value even after saponification treatment, a method for producing a transparent protective substrate that does not decrease in contrast and transparency, a method for producing the same. The obtained transparent protective substrate and a polarizing plate using the transparent protective substrate are provided.

  In a preferred embodiment of the present embodiment, a coating composition consisting essentially of resin beads having a refractive index of 1.40 to 1.60 and an ionizing radiation-curable resin composition is applied on a transparent substrate, A transparent protective substrate having an antiglare film can be obtained by irradiating ionizing radiation onto the uncured coating film of the coating composition to cure the coating film of the coating composition.

  The transparent substrate, triacetyl cellulose film, diacetyl cellulose film, acetate butyrate cellulose film, polyether sulfone film, polyacrylic resin film, polyurethane resin film, polyester film, polycarbonate film, polysulfone film, polyether film And a trimethylpentene film, a polyetherketone film, a (meth) acrylonitrile film, and the like. Among them, a triacetylcellulose film is particularly preferably used because of its excellent transparency.

  The film-forming component used in the ionizing radiation-curable resin composition is preferably one having an acrylate-based functional group, for example, a relatively low molecular weight polyester resin, polyether resin, acrylic resin, epoxy resin, urethane resin. , Alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, oligomers or prepolymers of polyfunctional compounds such as polyhydric alcohols, such as (meth) acrylates, and ethyl (meth) acrylate, ethylhexyl (meth) as a reactive diluent Monofunctional monomers such as acrylate, styrene, methylstyrene, N-vinylpyrrolidone and polyfunctional monomers, for example, trimethylolpropane tri (meth) acrylate, hexanediol (meth) acrylate, tripropylene glycol Di (meth) acrylate, diethylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate And the like can be used.

  Particularly preferably, a mixture of a polyester acrylate and a polyurethane acrylate is used. The reason is that polyester acrylate has a very hard coating and is suitable for obtaining a hard coat.However, polyester acrylate alone has low impact resistance and becomes brittle, so that the coating has high impact resistance and flexibility. Polyurethane acrylate is used in combination to impart properties. The mixing ratio of the polyurethane acrylate to 100 parts by weight of the polyester acrylate is 30 parts by weight or less. If it exceeds this value, the coating film is too soft and loses the hard property.

  Furthermore, in order to make the above-mentioned ionizing radiation-curable resin composition into an ultraviolet-curable resin composition, acetophenones, benzophenones, Michler benzoyl benzoate, α-amyloxime ester, Methylthiuram monosulfide, thioxanthones, and n-butylamine, triethylamine, tri-n-butylphosphine, and the like as a photosensitizer can be mixed and used. In particular, in the present invention, it is preferable to mix urethane acrylate as an oligomer and dipentaerythritol hexaacrylate as a monomer.

  The ionizing radiation-curable resin composition is preferably mixed with resin beads having a refractive index of 1.40 to 1.60 in order to impart antiglare properties. The reason for limiting the refractive index of the resin beads to such a value is that the refractive index of the ionizing radiation-curable resin is usually 1.40 to 1.50, so that the refractive index is as close as possible to the refractive index of the ionizing radiation-curable resin. This is because, if a resin bead having a ratio is selected, the transparency of the coating film is not impaired, and the antiglare property can be increased. Incidentally, resin beads having a refractive index close to the refractive index of the ionizing radiation-curable resin are shown below.

Resin beads name Refractive index MMA (polymethyl methacrylate) beads 1.49
Polycarbonate beads 1.58
Polystyrene beads 1.50
Polyacryl styrene beads 1.57
Polyvinyl chloride beads 1.54
The resin beads having a particle diameter of 3 to 8 μm are suitably used, and 2 to 10 parts by weight, usually about 4 parts by weight, per 100 parts by weight of the resin.

  When such resin beads are mixed into the coating composition, it is necessary to stir and thoroughly disperse the resin beads settled at the bottom of the container when using the coating. In order to eliminate such inconvenience, the coating composition may contain silica beads having a particle diameter of 0.5 μm or less, preferably 0.1 to 0.25 μm, as an anti-settling agent for resin beads. The more the silica beads are added, the more effective at preventing the sedimentation of the organic filler, but it has a bad influence on the transparency of the coating film. Therefore, the amount is preferably not more than 0.1 parts by weight, which does not impair the transparency of the coating film, and which can prevent sedimentation, based on 100 parts by weight of the resin.

  Further, an antistatic agent may be added to the coating composition for forming a hard coat coating film having antiglare properties used in the present invention for the purpose of preventing the coating film from being charged. As the antistatic agent, a metal filler, tin oxide, indium oxide, or the like can be used.

  The coating composition for forming the anti-glare film used in the present invention may contain 10 parts by weight or more and 100 parts by weight or less of the solvent-drying resin with respect to 100 parts by weight of the resin. As the solvent drying type resin, a thermoplastic resin is mainly used. In particular, when a mixture of polyester acrylate and polyurethane acrylate is used for the ionizing radiation-curable resin composition, the solvent-dried resin used is preferably poly (methyl methacrylate) or poly (butyl methacrylate) or cellulose acetate propionate. Used for

  In the present invention, the reason for including the solvent-drying resin in the ionizing radiation-curable resin composition is described below. The paint used in the present invention, for example, a roll coater having a metalling roll, for example, when applied to a transparent substrate with a slit reverse coater, the solvent-drying resin is essentially from the ionizing radiation-curable resin composition as described above. This is because when the composition is contained in the constituted coating composition, a coating film defect does not occur during roll coating.

  FIG. 7 shows a specific example of the slit reverse coating. In this coating apparatus, the base material is transferred to the backup roll 102, and the composition is coated on the base material by the nozzle coating apparatus 101. The coating composition is adjusted in part B by the metalling roll 103, and the unnecessary composition is removed by the doctor 104.

  The method of curing a coating composition consisting essentially of such an ionizing radiation-curable resin composition can be performed by a usual method of curing an ionizing radiation-curable resin composition, that is, by irradiation with an electron beam or ultraviolet rays. For example, in the case of electron beam curing, 50 to 1000 KeV emitted from various electron beam accelerators such as Cockloft-Walton type, Bande graph type, Resonant transformation type, Insulating core transformer type, Linear type, Dynamitron type, High frequency type, Preferably, an electron beam having an energy of 100 to 300 KeV is used. In the case of ultraviolet curing, ultraviolet rays emitted from light beams such as an ultra-high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc, a xenon arc, and a metal halide lamp can be used. .

  Further, in the present invention, a polarizing plate is formed by laminating a polarizing element on the transparent protective substrate on which the hard coat coating film having antiglare properties manufactured as described above is formed. As the polarizing element, a polyvinyl alcohol film, a polyvinyl formal film, a polyvinyl acetal film, a saponified ethylene-vinyl acetate copolymer film, or the like, which is dyed and stretched with iodine or a dye, can be used. In the case where the transparent protective substrate is, for example, a triacetyl cellulose film, a saponification treatment is performed on the triacetyl cellulose film in order to increase adhesiveness and prevent static electricity in the lamination process. This saponification treatment may be performed before or after applying the hard coat to the triacetyl cellulose film.

Production Example of Polarizing Plate Next, a preferred embodiment for improving the durability of the liquid crystal cell by adjusting the moisture permeability of the polarizing plate provided on the surface of the liquid crystal cell, particularly, the sheet used for the polarizing plate will be described.

  In recent years, the development of display devices such as LCDs, CRTs, and plasma displays has been remarkable. In particular, LCDs have been required to have a large size, color, and high definition, and require a polarizing plate with excellent durability. Have been. A cellulose triacetate sheet (hereinafter, referred to as a TAC sheet) excellent in light transmittance and adhesion to other materials has been used as a polarizing plate of an LCD having high definition.

  Conventionally, a transparent sheet used for a polarizing plate is a TAC sheet having excellent optical functions such as haze, reflectance, light transmittance, and image clarity, and an anti-glare layer considers adhesion to the transparent sheet. As a material satisfying abrasion resistance, abrasion resistance and the like, a material using an ionizing radiation-curable resin as a binder has been selected and used.

  Some TAC sheets used for conventional polarizing plates have excellent optical properties, but have a disadvantage that they are inferior in moisture resistance and have high moisture permeability as compared with other polyester and other plastic sheets. is there. Therefore, a polarizing plate using a TAC sheet is inferior in durability such that the sheet itself is hydrolyzed by environmental moisture to be deteriorated, or the function of a polarizer made of polyvinyl alcohol is reduced due to transmitted moisture. There was a problem.

  Therefore, in this embodiment, a TAC sheet having excellent optical properties is used as a polarizing plate to provide moisture resistance, prevent hydrolysis thereof, and a polarizer made of polyvinyl alcohol has excellent durability without functional deterioration. Provide a polarizing plate.

In order to achieve the above object, in this embodiment, in a polarizing plate provided with a polarizer between two transparent sheets, at least one sheet is defined in JIS Z0208. Moisture-proof packaging material 500 g / m ² · 24 hrs. It has the following moisture permeability.

  Further, the transparent sheet is a cellulose triacetate sheet, and the hard coat layer, and the thickness of the hard coat layer provided on the sheet surface and comprising pentaerythritol triacrylate and a polymerization initiator is 3 μm. It is a polarizing plate having a thickness of 20 μm.

  As shown in FIG. 8, the antiglare polarizing plate AB of this embodiment has a transparent sheet 201 on which at least one surface is provided with an antiglare film 3b according to the present invention. A polarizer 202 made of alcohol and a transparent sheet 201 are sequentially laminated.

The moisture permeability of the transparent sheet provided with the anti-glare film layer 203b is 500 g / m ² · 24 hrs. (Hereinafter, the moisture permeability is simply described as g / m ² ).

  The transparent sheet used in this embodiment includes a stretched polyester sheet, a polycarbonate sheet, a polymethyl methacrylate sheet, a polyvinyl chloride sheet, a saponified ethylene / vinyl acetate copolymer sheet, a polymethylpentene sheet, and the like. Preferably, it is a necessary condition that the optical functions are excellent, such as excellent haze, reflectance, light transmittance, and image clarity, and that there is no unevenness in sheet thickness and high accuracy. An 80 μm TAC sheet is often used.

  A polarizer composed of a polyvinyl alcohol film is obtained by laminating two 20 μm-thick films each having uniaxial stretching and having polarizability due to unidirectional molecular orientation. The liquid crystal cell for LCD is configured by sealing a liquid crystal cell provided with a color filter in the middle of two glass plates with transparent electrodes, and laminating a polarizing plate on each outer surface via an adhesive layer. .

  Then, as shown in FIG. 8, for example, the polarizing plate is configured such that a polarizer 202 is interposed between a transparent sheet 201 and an anti-glare sheet SB provided with an anti-glare hard coat layer 203b.

  As the binder of the antiglare hard coat layer 203b provided on the surface of the transparent sheet 201, an ultraviolet curable resin which is easy to handle is selected as a binder from ionizing radiation curable resins in consideration of adhesion to the sheet and scratch resistance. .

  As the ionizing radiation-curable resin, a composition obtained by appropriately mixing a prepolymer, oligomer, and / or monomer having a polymerizable unsaturated bond or an epoxy group in a molecule is used.

  These resin systems include acrylates such as urethane acrylate, unureta methacrylate, polyester acrylate, polyester methacrylate, epoxy acrylate, and epoxy methacrylate, silicon resins such as methacrylate and siloxane, and polyester epoxy.

  The prepolymers and oligomers include unsaturated polyesters such as condensates of unsaturated dicarboxylic acids and polyhydric alcohols.

  Monomers include multifunctional acrylate monomers such as pentaerythritol triacrylate, trimethylolpropane triacrylate, pentaerythritol hexaacrylate, and styrene, α-methylstyrene, methyl acrylate, methyl methacrylate, acrylamide, Examples include ethylene glycol diacrylate and trimethylolpropane trithioglycolate.

  In particular, when ultraviolet curing is performed, the ionizing radiation-curable resin composition is added to a photopolymerization initiator such as acetophenones, benzophenones, Michler benzoyl benzoate, thioxanthones, and / or triethylamine or tri- n-Butylphosphine and the like can be mixed and used.

  A surfactant having an antistatic effect for the purpose of preventing adhesion of dust due to static electricity to the antiglare hard coat layer of the polarizing plate used on the surface of the liquid crystal cell can be included in the coating liquid for the antiglare hard coat layer. .

  The surfactant is appropriately selected from nonionic surfactants, cationic surfactants, and amphoteric surfactants.

  For the purpose of improving the scratch resistance of the antiglare hard coat layer of the polarizing plate used on the surface of the liquid crystal cell, a lubricant is appropriately selected from among hydrocarbons, fatty acids, fatty acid esters, amides, amines, silicones and the like. It can also be added.

  As the light diffusing agent, silica, calcium carbonate, precipitated barium sulfate, aluminum hydroxide powder, polyethylene particles, polymethyl methacrylate particles, appropriately selected from organic fine particles such as polycarbonate particles, used. In particular, silica powder has a high transmittance with respect to ultraviolet rays and is an excellent substance which does not hinder the curing of the ultraviolet-curable resin as a binder.

  The thickness of the antiglare hard coat layer capable of obtaining a desired moisture permeability is 3 μm or more, preferably 5 μm or more and 20 μm or less.

  When the thickness of the coat layer is 3 μm or less, the defects of the projections of the raw material cannot be covered. When the thickness is 20 μm or more, the curling becomes severe and the mechanical aptitude deteriorates. 8 μm.

  One or more of the above compounds and additives may be used as needed. The resin varnish has a viscosity of 200 to 1500 centipoise suitable for a reverse roll coating method for smoothing the application surface, has a leveling property after application, and has a solid content of 60 to cover fine projections. % Or more is better. In order to satisfy the above conditions, it is preferable that the viscosity is adjusted by adding a curing agent and a solvent to 100 parts of pentaerythritol triacrylate from the above monomers.

  Depending on the amount of the light diffusing agent used in the antiglare hard coat layer, the moisture permeability may increase. In some cases, the transparent layer and the antiglare layer are formed on the same surface of the sheet by using an ionizing radiation-curable resin varnish. A layer having a desired moisture permeability can also be provided by a two-layer coating with a hard coat layer.

  The coating method for forming the antiglare hard coat layer is determined by the properties and amount of the coating solution, but in order to obtain a smooth surface, from direct or reverse roll coating, bar coating, gravure coating, etc. After the application, before the coating is cured, the coating surface is flowed, and a smooth uniform surface is obtained. The viscosity is 200 to 1500 centipoise, which is a viscosity suitable for flowability.

The polarizing plate of the present invention includes those shown in FIGS. That is,
(1) A diagram in which an antiglare sheet SB in which an antiglare hard coat layer (antiglare film layer) 203b is provided on a transparent sheet 201, a polarizer 202, and a transparent sheet 201 without a hard coat layer are sequentially laminated. 8. The antiglare polarizing plate AB shown in 8.

(2) Moisture proof is obtained by sequentially laminating a moisture proof sheet SC provided on a transparent sheet 201, a polarizer 202, and a transparent sheet 201 not provided with a hard coat layer, as shown in FIG. Polarizing plate AC.

(3) A polarizing plate AA in which a transparent sheet 201 without a hard coat layer, a polarizer 202, and a transparent sheet 201 without a hard coat layer are sequentially laminated as shown in FIG.

(4) As the transparent sheet, a polyethylene terephthalate sheet which is slightly inferior in optical and surface strength but is superior in moisture resistance can be used. That is, the moisture-proof polarizing plate AD shown in FIG. 11, in which a transparent sheet 201, a polarizer 202, and a moisture-proof transparent sheet (polyethylene terephthalate) 1D without a hard coat layer are sequentially laminated.

The above-mentioned polarizing plate is appropriately selected depending on the required degree of durability, and the liquid crystal 4 is used to constitute a “liquid crystal cell” for LCD. That is,
(1) A “liquid crystal cell” constituted by using a polarizing plate AA in which a hard coat layer is not provided on both polarizing plates as shown in 4AA of FIG. 12A.

(2) "Anti-glare liquid crystal cell" for LCDs, comprising an anti-glare polarizer AB on one surface and a polarizer AA without a hard coat layer on the other surface as shown in 4AB of FIG. 12B.

(3) An anti-glare polarizing plate AB having an anti-glare hard coat layer provided on one of the polarizing plates and a moisture-proof polarizing plate AC having a moisture-proof hard coat layer provided on the other surface as shown by 4BC in FIG. 12C. In addition, three types of “glare-proof and moisture-proof liquid crystal cell” for LCD in which both transparent sheets 201 are provided with a coating layer made of an ionizing radiation curable resin can be constituted.

(4) Further, as shown in 4BD in FIG. 12D, one of the polarizing plates is not provided with a hard coat layer, but a transparent moisture-proof polarizing plate AD formed of a moisture-proof polyethylene terephthalate sheet 1D and the other surface are provided. The "glare-proof and moisture-proof liquid crystal cell" for LCD can be constituted by the glare-proof polarizing plate AB.

As described above, the polarizing plate provided with the antiglare hard coat layer made of the ionizing radiation curable resin formed on the surface of the transparent sheet has a moisture permeability of 500 g / m2 due to the antiglare hard coat layer and the moisture proof hard coat layer. ^It is composed of ² or less.

  Then, it prevents moisture from the outside from penetrating into the inside of the transparent sheet, thereby preventing a chemical change such as hydrolysis of the transparent sheet and preventing the liquid crystal function of the polarizer from lowering.

Example 1
A UV-curable resin 2 having the following composition was applied to a triacetylcellulose film [TAC 80 μml (manufactured by Fuji Photo Film Co., Ltd., FT-UV-80)] by a roll coating method so as to be 7 to 8 g / m ² .

100 parts by weight of polyfunctional acrylate (pentaerythritol triacrylate)
Cellulose acetate propionate 1.2 parts by weight Benzophenone 4 parts by weight Irgacure 4 parts by weight (toluene)
Next, after drying the solvent, a matted PET (Ra: 0.47, Sm: 47.5) was laminated as a shape-imparting film, and irradiation with a 160 W × 2 mercury lamp from a distance of 15 cm was performed under ultraviolet curing conditions. The ultraviolet curable resin was cured under the condition of 10 m / min. Further, the shaped film was peeled off to obtain an antiglare film.

The measurement results of the optical properties of the film are as follows.
Total light transmittance 87.5%
Haze 28.9%
60 ° gloss 25.6% or less Center line average roughness Ra 0.42 μm
Concavo-convex pitch Sm 70.8μm
The antiglare film thus obtained had no glare due to light reflection and was excellent in image clarity.

  The measuring methods and measuring instruments for the optical properties and surface roughness are as follows. The same applies to embodiments described later.

Haze <Haze>: JIS K6714 / Toyo Seiki direct reading haze meter Total light transmittance: JIS K6714 / Toyo Seiki direct reading haze meter Gloss <Gross>: JIS K8741 / Murakami Color Research Laboratory GM -3D
Center line average roughness <Ra>: JIS B0601
Average spacing of unevenness <Sm>: Kosaka Laboratory SEF-30.

Example 2
Triacetylcellulose film (TAC 80 μm (FT-UV-80 manufactured by Fuji Photo Film Co., Ltd.)) Polyester film 75 μm (T-60 manufactured by Toray Industries Inc.) A solution containing 5 parts by weight of an agent (silica beads) was applied by a roll coating method so as to have a concentration of 7 to 8 g / m ² . After the solvent was dried, matted PET (Ra: 0.46, Sm: 45.0) was laminated as a shape-imparting film, and as a UV curing condition, a mercury lamp of 160 W × 2 was used, and a distance of 15 cm was set to 10 m / min. After curing the ultraviolet curable resin under the conditions described above, the imprinting film was peeled off to obtain an antiglare film.

The measurement results of the optical properties of the film are as follows.
Total light transmittance 87.0%
Haze 30.1%
60 ° gloss 24.6%
Surface roughness 46μm
Uneven pitch 70.7μm
As in the case of Example 1, glare due to light reflection was prevented, and an antiglare film in which an image was clearly visible was obtained.

Comparative Example 1
AG30 manufactured by Nitto Denko Corporation has optical characteristics of total light transmittance of 87%, HAZE 3.5%, glossiness of 110% at 60 °, a surface center line average roughness of 0.2 μm, and a pitch between surface irregularities of 170 μm. It was a hard coat film having a surface roughness and had glare on the surface.

  The anti-glare film of the following example was manufactured according to the following manufacturing conditions.

Example 3
(1) Base material: TAC (triacetyl cellulose)
Thickness: 80 μm
Manufacturer: Fuji Photo Film Co., Ltd.
Product name: FT-UV-80
(2) Coating resin Material name Parts by weight
Resin: pentaerythritol triacrylate 98.8
Cellulose acetate propionate 1.2
Photoinitiator: Irgacure 184 (manufactured by Ciba Geigy) 2.7
Benzophenone 2.7
Particles: Material: Silane treated silica 4.2
Size: average particle size 3 μm
Additive: ether-modified silicone 0.1
Diluent solvent: toluene 84.8
Ethyl acetate 5.0
(3) Coating Coating method: slit reverse method
Coating thickness: 5 g / m ² (DRY)
(4) Drying Drying temperature: about 70 ° C
Drying time: about 1 min
(5) No shaping film (6) UV irradiation Lamp used: High-pressure mercury lamp (Ushio Inc.)
With conveyor
Lamp output: 160W / cm
Line speed: 10m / min
Number of irradiations: 2 pass.

Example 4
(1) Base material: TAC (triacetyl cellulose)
Thickness: 80 μm
Manufacturer: Fuji Photo Film Co., Ltd.
Product name: FT-UV-80
(2) Coating resin Material name Parts by weight
Resin: pentaerythritol triacrylate 98.8
Cellulose acetate propionate 1.2
Photoinitiator: Irgacure 184 (manufactured by Ciba Geigy) 2.7
Benzophenone 2.7
Particles: Material: Acrylic 2.8
Size: average particle size 5 μm
Additive: ether-modified silicone 0.1
Diluent solvent: Toluene 94.8
Ethyl acetate 5.0
(3) Coating Coating method: slit reverse method
Coating thickness: 5 g / m ³ (DRY)
(4) Drying Drying temperature: about 80 ° C
Drying time: about 1 min
(5) No shaping film (6) UV irradiation Lamp used: High-pressure mercury lamp (Ushio Inc.)
With conveyor
Lamp output: 160W / cm
Line speed: 10m / min
Number of irradiations: 2 pass.

Example 5
(1) Base material: TAC (triacetyl cellulose)
Thickness: 80 μm
Manufacturer: Fuji Photo Film Co., Ltd.
Product name: FT-UV-80
(2) Coating resin Material name Parts by weight
Resin: pentaerythritol triacrylate 98.8
Cellulose acetate propionate 1.2
Photoinitiator: Irgacure 184 (manufactured by Ciba Geigy) 2.7
Benzophenone 2.7
Particles: Material: Silane-treated silica 3.8
Size: 1.5 μm average particle size
Additive: ether-modified silicone 0.1
Diluent solvent: toluene 104.4
Ethyl acetate 5.0
(3) Coating Coating method: slit reverse method
Coating thickness: 5 g / m ³ (DRY)
(4) Drying Drying temperature: about 40 ° C
Drying time: about 1 min
(5) No shaping film (6) UV irradiation Lamp used: High-pressure mercury lamp (Ushio Inc.)
With conveyor
Lamp output: 160W / cm
Line speed: 10m / min
Number of irradiations: 2 pass.

Example 6
(1) Base material: TAC (triacetyl cellulose)
Thickness: 80 μm
Manufacturer: Fuji Photo Film Co., Ltd.
Product name: FT-UV-80
(2) Coating resin Material name Parts by weight
Resin: pentaerythritol triacrylate 98.8
Cellulose acetate propionate 1.2
Photoinitiator: Irgacure 184 (manufactured by Ciba Geigy) 2.7
Benzophenone 2.7
Particles: Material: Silane-coupling treated silica 5.6
Size: 1.5 μm average particle size
Additive: ether-modified silicone 0.1
Diluent solvent: toluene 106.4
Ethyl acetate 5.0
(3) Coating Coating method: slit reverse method
Coating thickness: 5 g / m ³ (DRY)
(4) Drying Drying temperature: about 40 ° C
Drying time: about 1 min
(5) No shaping film (6) UV irradiation Lamp used: High-pressure mercury lamp (Ushio Inc.)
With conveyor
Lamp output: 160W / cm
Line speed: 10m / min
Number of irradiations: 2 pass.

Example 7
(1) Base material: TAC (triacetyl cellulose)
Thickness: 80 μm
Manufacturer: Fuji Photo Film Co., Ltd.
Product name: FT-UV-80
(2) Coating resin Material name Parts by weight
Resin: pentaerythritol triacrylate 98.8
Cellulose acetate propionate 1.2
Photoinitiator: Irgacure 184 (manufactured by Ciba Geigy) 3.3
Benzophenone 3.3
Particles: Material: Silane-coupling-treated silica 26.4
Size: average particle size 1 μm
Additive: ether-modified silicone 0.1
Diluent solvent: toluene 128.0
Ethyl acetate 5.0
(3) Coating Coating method: slit reverse method
Coating thickness: 5 g / m ³ (DRY).

Example 8
(1) Base material: TAC (triacetyl cellulose)
Thickness: 80 μm
Manufacturer: Konica Corporation
Product name: KC80UVS
(2) Coating resin Material name Parts by weight
Resin: pentaerythritol triacrylate 98.8
Cellulose acetate propionate 1.2
Photoinitiator: Irgacure 184 (manufactured by Ciba Geigy) 3.0
Benzophenone 3.0
Particles: None
Additive: ether-modified silicone 0.2
Diluent solvent: toluene 125.0
Ethyl acetate 5.0
(3) Coating Coating method: slit reverse method
Coating thickness: 8 g / m ³ (DRY)
(4) Drying Drying temperature: about 40 ° C
Drying time: about 1 min
(5) Molding film material: PET (polyester) (kneading matting agent)
Thickness: 26 μm
Manufacturer: Diamond Foil Hoechst Co., Ltd.
Product name: E-130
(6) UV irradiation Lamp used: High-pressure mercury lamp (Ushio Inc.)
With conveyor
Lamp output: 160W / cm
Line speed: 10m / min
Number of irradiations: 2 pass.

Example 9
(1) Base material: TAC (triacetyl cellulose)
Thickness: 80 μm
Manufacturer: Fuji Photo Film Co., Ltd.
Product name: FT-UV-80
(2) Coating resin Material name Parts by weight
Resin: pentaerythritol triacrylate 98.8
Cellulose acetate propionate 1.2
Photoinitiator: Irgacure 184 (manufactured by Ciba Geigy) 3.0
Benzophenone 3.0
Particles: None
Additive: ether-modified silicone 0.2
Diluent solvent: toluene 125.0
Ethyl acetate 5.0
(3) Coating Coating method: slit reverse method
Coating thickness: 8 g / m ³ (DRY)
(4) Drying Drying temperature: about 70 ° C
Drying time: about 1 min
(5) Molding film material: PET (polyester) (kneading matting agent)
Thickness: 26 μm
Manufacturer: Diamond Foil Hoechst Co., Ltd.
Product name: E-130
(6) UV irradiation Lamp used: High-pressure mercury lamp (Ushio Inc.)
With conveyor
Lamp output: 160W / cm
Line speed: 10m / min
Number of irradiations: 2 pass.

Example 10
(1) Base material: TAC (triacetyl cellulose)
Thickness: 80 μm
Manufacturer: Konica Corporation
Product name: KC80UVS
(2) Coating resin Material name Parts by weight
Resin: pentaerythritol triacrylate 98.8
Cellulose acetate propionate 1.2
Photoinitiator: Irgacure 184 (manufactured by Ciba Geigy) 3.0
Benzophenone 3.0
Particles: None
Additive: ether-modified silicone 0.2
Diluent solvent: toluene 125.0
Ethyl acetate 5.0
(3) Coating Coating method: slit reverse method
Coating thickness: 8 g / m ₃ (DRY)
(4) Drying Drying temperature: about 40 ° C
Drying time: about 1 min
(5) Molding film Material: PET (polyester)
Thickness: 25 μm
Manufacturer: Toray Industries, Inc.
Product name: E-06
(6) UV irradiation Lamp used: High-pressure mercury lamp (Ushio Inc.)
With conveyor
Lamp output: 160W / cm
Line speed: 10m / min
Number of irradiations: 2 pass.

Example 11
(1) Base material: TAC (triacetyl cellulose)
Thickness: 80 μm
Manufacturer: Konica Corporation
Product name: KC80UVS
(2) Coating resin Material name Parts by weight
Resin: pentaerythritol triacrylate 98.8
Cellulose acetate propionate 1.2
Photoinitiator: Irgacure 184 (manufactured by Ciba Geigy) 3.0
Benzophenone 3.0
Particles: None
Additive: ether-modified silicone 0.2
Diluent solvent: toluene 125.0
Ethyl acetate 5.0
(3) Coating Coating method: slit reverse method
Coating thickness: 8 g / m ³ (DRY)
(4) Drying Drying temperature: about 40 ° C
Drying time: about 1 min
(5) Molding film material: PET (polyester) (kneading matting agent)
Thickness: 25 μm
Manufacturer: Unitika Ltd.
Product name: PTH-25
(6) UV irradiation Lamp used: High-pressure mercury lamp (Ushio Inc.)
With conveyor
Lamp output: 160W / cm
Line speed: 10m / min
Number of irradiations: 2 pass.

Example 12
(1) Base material: TAC (triacetyl cellulose)
Thickness: 80 μm
Manufacturer: Fuji Photo Film Co., Ltd.
Product name: FT-UV-80
(2) Coating resin Material name Parts by weight
Resin: Ventaerythritol triacrylate 98.8
Cellulose acetate propionate 1.2
Photoinitiator: Irgacure 184 (manufactured by Ciba Geigy) 3.0
Benzophenone 3.0
Particles: None
Additive: ether-modified silicone 0.2
Diluent solvent: toluene 125.0
Ethyl acetate 5.0
(3) Coating Coating method: slit reverse method
Coating thickness: 8 g / m ³ (DRY)
(4) Drying Drying temperature: about 40 ° C
Drying time: about 1 min
(5) Imprinted film Base material: Material: PET
Thickness: 26 μm
Manufacturer: Diamond Foil Hoechst Co., Ltd.
Product name: E-130
Coating resin: cellulose acetate propionate 100.0 parts by weight
Xylene di-isocyanate 22.0
Silicone 1.5
MEK 490.3
Ethyl acetate 7.4
Toluene 414.1
Anon 416.8
Coating: Coating method: Matrix berth method
Coating thickness: 3 g / m ³ (DRY)
Drying: temperature: 80 ° C
Time: about 1 min
Deposition: 70 ° C for 5 days (6) UV irradiation Lamp used: High-pressure mercury lamp (Ushio Inc.)
With conveyor
Lamp output: 160W / cm
Line speed: 10m / min
Number of irradiations: 2 pass.

Comparative Example 2
(1) Base material: TAC (triacetyl cellulose)
Thickness: 80 μm
Manufacturer: Fuji Photo Film Co., Ltd.
Product name: FT-UV-80
(2) Coating resin Material name Parts by weight
Resin: pentaerythritol triacrylate 98.8
Cellulose acetate propionate 1.2
Photoinitiator: Irgacure 184 (manufactured by Ciba Geigy) 3.0
Benzophenone 3.0
Particles: None
Additive: ether-modified silicone 0.2
Diluent solvent: toluene 125.0
Ethyl acetate 5.0
(3) Coating Coating method: slit reverse method
Coating thickness: 8 g / m ³ (DRY)
(4) Drying Drying temperature: about 70 ° C
Drying time: about 1 min
(5) Molding film material: PET
Thickness: 25 μm
Manufacturer: Toray Industries, Inc.
Product name: MT-HP
(6) UV irradiation Lamp used: High-pressure mercury lamp (Ushio Inc.)
With conveyor
Lamp output: 160W / cm
Line speed: 10m / min
Number of irradiations: 2 pass.

  All of Examples 3 to 12 described above exhibited excellent antiglare effects and also exhibited excellent image display quality.

  On the other hand, the display screen to which the anti-glare film of Comparative Example 2 was applied was inferior in image display quality, and particularly, the screen was entirely white and had low contrast.

The following table shows the optical characteristics and surface characteristics of the above examples and comparative examples.

FIG. 1 is a schematic sectional view showing an embodiment of the present invention. FIG. 2 is a conceptual diagram showing light reflection and transmission with respect to the antiglare film of the present invention. FIG. 3 is a schematic cross-sectional view illustrating an example of a case where the antiglare film of the present invention is manufactured. FIG. 4A is a schematic cross-sectional view showing an example of a matted film base, and FIG. 4B is a cross-sectional view of a formed film obtained by applying a resin to the formed film base. 5A and 5B are explanatory views showing steps in the case of manufacturing an antiglare film. FIG. 5A is a cross-sectional view of a molding film obtained by applying a resin to a molding film base, and FIG. 5C is a cross-sectional view of a laminated film in which an ionizing radiation-curable resin before curing is formed on a material, FIG. 5C is a cross-sectional view of a laminated sheet in which the molding film of FIG. 5A is laminated on the laminated film of FIG. 5B, and FIG. Sectional view of the imprinting film and the anti-glare film when the immobilizing film is peeled off after irradiating the laminated sheet with ionizing radiation to cure the ionizing radiation-curable resin layer FIG. 6A is a cross-sectional view of a shaping film coated with a resin to which fine silica particles are added, and FIG. 6B is a cross-sectional view of an antiglare film manufactured using the shaping film of FIG. 6A. FIG. 7 is a diagram illustrating an example of a coating apparatus used when applying the ionizing radiation-curable resin composition. FIG. 8 is a cross-sectional view of a polarizing plate to which the antiglare film of the present invention is applied. FIG. 9 is a cross-sectional view of a polarizing plate to which the antiglare film of the present invention has been applied. FIG. 10 is a sectional view showing a specific example of a polarizing plate to which a moisture-proof sheet is applied. FIG. 11 is a sectional view showing a specific example of a polarizing plate to which a moisture-proof sheet is applied. 12A to 12D are cross-sectional views each showing a specific example of a liquid crystal cell to which the polarizing plate of the present invention is applied.

Claims (21)

A transparent film,
Provided on the transparent film, has optical characteristics of total light transmittance of 85% or more, haze of 3.0 to 35%, and 60 ° gloss of 90% or less, and has a surface center line average roughness of 0.05 to 0.05%. An antiglare film for a display, comprising an ionizing radiation-curable resin layer having a surface roughness of 0.25 μm and a pitch between surface irregularities of 5 to 150 μm.   The antiglare film according to claim 1, wherein an antireflection layer made of a metal compound is further formed on the surface of the ionizing radiation-curable resin layer. The antireflection layer _is made of Al ₂ O 3, at least one of ZnO ₂ and MgF _2, antiglare film according to claim 1.   The anti-glare film according to claim 1, wherein the anti-glare film is obtained using a shaped film substrate formed into a mat by providing an uneven shape on the surface.   A molding film having a desired uneven shape is prepared by applying a resin to the uneven surface of the shaping film base material formed into a mat by providing an uneven shape on the surface, if desired. The anti-glare film according to claim 1, obtained by shaping an ionizing radiation-curable resin layer formed on a substrate film into a concavo-convex shape by using the resin. In order to obtain the anti-glare film according to claim 1, a desired irregular shape is formed by applying a resin, if desired, to the irregular surface of the shaping film substrate formed by matting by providing the irregular surface on the surface. To obtain a shaped film,
The shaping film obtained in this way, the one obtained by coating and forming an ionizing radiation-curable resin on a base film, such that the ionized radiation-curable resin-coated surface and the uneven surface of the shaping film are in contact with each other. Laminating, further irradiating ionizing radiation from the molding film side or the base film side of the laminate to cure the ionizing radiation-curable resin, and further removing the molding film from the laminate.
A method for producing an antiglare film comprising:   The imprinting film coated with the resin is a imprinting film formed by forming a concavo-convex shape by coating a matted film with a transparent resin or a resin to which fine particles having a particle size of 0.5 to 10 μm are added, and an ionizing radiation-curable resin. 7. The method of claim 6, wherein is a UV curable resin and the ionizing radiation is UV light.   The method according to claim 6, wherein the surface roughness of the shaping film is 0.1 to 10 m in center line average roughness (Ra).   7. The method according to claim 6, further comprising a step of irradiating ionizing radiation again to cure the ionizing radiation-curable resin after removing the imprinting film.   The anti-glare film according to claim 1, wherein the ionizing radiation-curable resin layer contains organic beads or inorganic beads.   The antiglare film according to claim 1, wherein the electron radiation-curable resin layer contains resin beads having a refractive index of 1.40 to 1.60. On a transparent substrate, a coating composition consisting essentially of organic beads or inorganic beads, preferably resin beads having a refractive index of 1.40 to 1.60, and an ionizing radiation-curable resin composition,
The method for producing a transparent protective substrate on which an antiglare film is formed according to claim 1, wherein the coating film of the coating composition is cured by irradiating ionizing radiation onto the uncured coating film of the coating composition. .   The method according to claim 12, wherein the coating composition further contains silica beads having a particle diameter of 0.5 µm or less as a resin bead settling inhibitor in an amount of less than 0.1 part by weight based on 100 parts by weight of the resin.   13. The method according to claim 12, wherein the coating composition contains 10 parts by weight or more and 100 parts by weight or less of the solvent-drying resin based on 100 parts by weight of the resin.   13. The method of claim 12, wherein the ionizing radiation curable resin composition consists essentially of polyester acrylate and polyurethane acrylate.   A polarizing plate obtained by laminating the transparent protective substrate obtained according to claim 12 on a polarizing element.   A polarizing plate comprising the antiglare film according to claim 1. Further comprising a transparent sheet following moisture permeability 500g ^/ m 2 · 24hrs by moistureproof packaging material moisture permeability test method prescribed in JIS Z0208, polarizing plate according to claim 17.   The polarizing plate according to claim 18, wherein the transparent sheet is made of cellulose triacetate.   The coating surface formed by coating an ionizing radiation-curable resin composition containing organic or inorganic beads, preferably a resin bead having a refractive index of 1.40 to 1.60, on a substrate film has an uneven surface. The antiglare film according to claim 1, which is obtained by shaping with a shaping film formed into a mat by providing. Prepare a molding film that is matted by providing irregularities on the surface,
Irregularities on the coating surface formed by applying and coating an ionizing radiation-curable resin composition containing organic or inorganic beads, preferably resin beads having a refractive index of 1.40 to 1.60, on a substrate film Laminate to form a laminate by touching the surface,
Irradiating ionizing radiation from the molding film side or the base film side of the laminate to cure the ionizing radiation-curable resin, and further peeling the molding film from the laminate.
A method for producing an antiglare film comprising:

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