WO2006038481A1 - ハードコートフィルム、反射防止ハードコートフィルム、光学素子および画像表示装置 - Google Patents
ハードコートフィルム、反射防止ハードコートフィルム、光学素子および画像表示装置 Download PDFInfo
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- WO2006038481A1 WO2006038481A1 PCT/JP2005/017601 JP2005017601W WO2006038481A1 WO 2006038481 A1 WO2006038481 A1 WO 2006038481A1 JP 2005017601 W JP2005017601 W JP 2005017601W WO 2006038481 A1 WO2006038481 A1 WO 2006038481A1
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- hard coat
- layer
- film
- antireflection
- coat film
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
- B32B23/04—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B23/08—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/671—Unsaturated compounds having only one group containing active hydrogen
- C08G18/672—Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
- C08G18/673—Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen containing two or more acrylate or alkylacrylate ester groups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
- C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
- C09D175/16—Polyurethanes having carbon-to-carbon unsaturated bonds having terminal carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/006—Anti-reflective coatings
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/66—Additives characterised by particle size
- C09D7/67—Particle size smaller than 100 nm
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
- G02B1/111—Anti-reflection coatings using layers comprising organic materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/26—Silicon- containing compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/256—Heavy metal or aluminum or compound thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/256—Heavy metal or aluminum or compound thereof
- Y10T428/257—Iron oxide or aluminum oxide
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/259—Silicic material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
Definitions
- Hard coat film, antireflection hard coat film, optical element and image display device are hard coat film, antireflection hard coat film, optical element and image display device
- the present invention relates to a hard coat film and an antireflection hard coat film in which at least one hard coat layer is provided on at least one surface of a transparent plastic film substrate. Furthermore, the present invention relates to an optical element such as a polarizing plate using the hard coat film and the antireflection hard coat film.
- the hard coat film, antireflection hard coat film and optical element of the present invention are suitably used for image display devices, particularly CRT, liquid crystal display (LCD), plasma display (PDP) and EL display (ELD).
- the power of LCDs as one of various image display devices
- applications that use LCDs are also notebook computers and monitors
- the power is also changing to television.
- the basic structure of the LCD is that a gap with a fixed interval is provided between the flat glass with two transparent electrodes by a spacer, and liquid crystal material is injected and sealed there.
- a polarizing plate is attached to the front and back surfaces of the flat glass. Since polarizing plates are easily scratched, in the past, glass cover plates with a glassy plastic power were attached to the LCD surface and attached to the LCD surface to prevent damage to the polarizing plate.
- a cover plate is disadvantageous in terms of cost and weight, and a polarizing plate having a hard coat treatment on the surface has gradually been used.
- the hard coat treatment is usually carried out by providing on the surface of the polarizing plate a node coat film in which a hard coat layer is provided on a transparent plastic film substrate.
- the hard coat layer is usually a thin film having a thickness of about 2 to 10 ⁇ m on a transparent plastic film substrate using ionizing radiation curable resin such as thermosetting resin or ultraviolet curable resin. Formed as.
- ionizing radiation curable resin such as thermosetting resin or ultraviolet curable resin.
- the thickness of the hard coat layer is not sufficient at the above thickness, even if it is a hard coat resin having a pencil hardness of 4H or more when coated on glass, a transparent plastic film substrate as a base is used. Transparent plastic affected by the material
- the surface hardness of the node coat layer formed on the film substrate is generally 2H or less in pencil hardness.
- Patent Document 1 discloses that a protective film for a polarizing plate in which a cured coating layer (node coating layer) made of a composition containing an ultraviolet curable polyol acrylate-based resin is formed on at least one surface of a transparent plastic film substrate.
- a cured coating layer node coating layer
- As the UV curable polyol acrylate resin dipentaerythritol hexane acrylate is mainly exemplified.
- the resin is coated on a plastic film substrate, it is possible to secure a pencil hardness of 4 mm or more by setting the thickness of the cured coating layer to 10 ⁇ m or more. It is difficult to suppress curling due to the same.
- Patent Document 2 a thickness of 3 to 5 is provided on at least one surface of a transparent plastic film substrate.
- Patent Document 2 requires a buffer layer in addition to the hard coat layer and requires at least a two-layer structure, which has the disadvantage of placing a burden on the production process.
- Patent Document 3 after providing a cured resin layer containing inorganic or organic internal crosslinked ultrafine particles as a first hard coat layer on at least one surface of a transparent plastic film or sheet base material, A second hard coat layer is proposed that is provided with a thin film of clear cured resin that does not contain internal cross-linked particles in the inorganic or organic cost.
- Patent Document 3 has a drawback in that it has a load on the production process by adopting a two-layer structure like Patent Document 2.
- Patent Document 4 discloses a hard coat film in which at least one hard coat layer is formed on at least one surface of a transparent plastic film substrate, and the hard coat layer forming material is 100 wt. It has been proposed to contain 20 to 80 parts by weight of inorganic fine particles per part, the total thickness of the hard coat layer is 10 ⁇ m to 50 ⁇ m, and the surface pencil hardness is 4H or more. However, the hard coat forming material containing inorganic fine particles in the above ratio with respect to the resin such as polyester acrylate or polyurethane acrylate used in Patent Document 4 has a thickness of 10 m or more on the transparent plastic film substrate. When a hard coat layer is formed by this method, it is difficult to balance the securing of sufficient hardness and curling suppression due to curing shrinkage. Patent Document 1: JP-A-9 113728
- Patent Document 2 Japanese Patent Laid-Open No. 11-300873
- Patent Document 3 Japanese Patent Laid-Open No. 2000-52472
- Patent Document 4 Japanese Patent Laid-Open No. 2000-112379
- the present invention is a hard coat film having a hard coat layer that is a cured coating film layer on at least one surface of a transparent plastic film substrate, and has a high hardness and is also cracked or hard.
- An object of the present invention is to provide a hard coat film having a hard coat layer in which curling due to chemical shrinkage is suppressed.
- Another object of the present invention is to provide an antireflection hard coat film having an antireflection layer on the hard coat layer of the hard coat film.
- an object of the present invention is to provide an optical element using the hard coat film or the antireflection hard coat film, and further to provide an image display device having the film or the optical element.
- the present invention is a hard coat film having a hard coat layer which is a cured coating layer on at least one surface of a transparent plastic film substrate,
- the hard coat layer is provided with elasticity and flexibility (flexibility) by using urethane acrylate (A) as the hard coat layer forming material. Also, by using isocyanuric acid acrylate (B), the degree of cross-linking of the hard coat layer is increased and high hardness is achieved. Furthermore, the use of inorganic ultrafine particles (C) alleviates the curing shrinkage that occurs when the resin forming the hard coat layer is cured. As a result, the hard coat film of the present invention has a pencil hardness of 3H or higher, and can effectively suppress cracking and curling.
- the hard coat film of the present invention has high hardness even when the hard coat layer is formed of a single layer of the forming material containing the component (A) to the component (C), and has a high hardness. Curling can be effectively suppressed, which is also advantageous in terms of productivity.
- the ultrafine particles (C) used as a material for forming the hard coat layer include titanium oxide, acid silica (silica), acid aluminum, zinc oxide, tin oxide, and the like.
- Acid Zirconium Power At least one selected metal oxide is suitable for use. I can.
- the inorganic ultrafine particles (C) preferably have an average particle size of lOOnm or less.
- the thickness of the hard coat layer is preferably controlled to 15 to 50 ⁇ m.
- a film having a pencil hardness of at least the hard coat film can be obtained.
- the thickness of the hard coat film of the present invention is not particularly limited. However, in order to obtain a hard coat layer having a high surface hardness, the thickness may be increased in the range of 15 to 50 ⁇ m. , Cracking and curling can be suppressed. Even when the pencil hardness is 4H or higher, it can be cracked and curled.
- the difference between the refractive index of the transparent plastic film substrate and the refractive index of the hard coat layer is preferably 0.04 or less.
- the present invention also relates to an antireflection hard coat film comprising an antireflection layer on a hard coat layer of the hard coat film.
- An antireflection hard coat film in which an antireflection layer is provided on the hard coat layer exhibits a good antireflection effect.
- the antireflection layer contains hollow and spherical acid / silicon oxide ultrafine particles.
- the present invention relates to an optical element characterized in that the hard coat film or the antireflection hard coat film is laminated on one side or both sides of the optical element.
- the present invention relates to an image display device having the hard coat film, the antireflection hard coat film, or the optical element.
- the hard coat film and antireflection hard coat film of the present invention can be suitably used for optical elements such as polarizers and polarizing plates, and can suppress cracking and curling while having high hardness, and can also be reflected. Interference fringes can be reduced, and LCDs such as LCDs for home TVs
- the present invention can also be suitably used for a display device.
- FIG. 1 is an example of a cross-sectional view of a hard coat film of the present invention.
- FIG. 2 is an example of a cross-sectional view of the antireflection hard coat film of the present invention.
- the hard coat film 4 of the present invention has a hard coat layer 2 on one side of a transparent plastic film substrate 1.
- the force hard coat layer 2 not shown in FIG. 1 can be provided on both surfaces of the transparent plastic film substrate 1.
- the antireflection hard coat film 5 of the present invention has an antireflection layer 3 on the hard coat layer 2 of the hard coat film 4 as shown in FIG.
- the hard coat layer 2 and the antireflection layer 3 can be provided on both surfaces of the transparent plastic film substrate 1.
- FIGS. 1 and 2 the case where the hard coat layer 2 and the antireflection layer 3 have one layer is illustrated, but if it has the hard coat layer of the present invention, these are two or more layers. There may be.
- a film that does not inhibit transparency can be used without any particular limitation.
- polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, polystyrene, polyarylate, cyclic olefin, triacetyl cellulose, acrylate resin, and polyvinyl chloride vinyl. .
- These can be stretched.
- a polyethylene terephthalate film that has been stretched, particularly biaxially stretched is preferred in terms of excellent mechanical strength and dimensional stability.
- film surface Triacetyl cellulose is also preferred because of its very small phase difference.
- the force that can be appropriately selected depending on the thickness of such a transparent plastic film substrate and the material to be applied is generally about 25 to 500 ⁇ m, preferably about 40 to 200 ⁇ m.
- the hard coat layer forming material is urethane acrylate (A), isocyanuric acid acrylate (B
- urethane acrylate (A) of the present invention one containing (meth) acrylic acid and Z or its ester, polyol, diisocyanate as a constituent component is used.
- a hydroxy (meth) acrylate having at least one hydroxyl group and at least one (meth) atalyloyl group is prepared from (meth) acrylic acid and Z or an ester thereof and a polyol. Those prepared by reacting with diisocyanate are used.
- (Meth) acrylic acid is acrylic acid and Z or methacrylic acid, and (meth) has the same meaning in the present invention. These components may be used alone or in combination of two or more.
- Examples of (meth) acrylic acid esters include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, and the like. And alkyl (meth) acrylate, and cycloalkyl (meth) acrylate such as cyclohexyl (meth) acrylate.
- the polyol is a compound having at least two hydroxyl groups, such as ethylene glycol, 1,3 propylene glycol, 1,2 propylene glycol, diethylene glycol, dipropylene glycol, neopentyl glycol, 1,3 butanediol.
- diisocyanate various aromatic, aliphatic or alicyclic diisocyanates can be used.
- diisocyanate various aromatic, aliphatic or alicyclic diisocyanates can be used.
- the urethane acrylate (A) is compared to the total amount of the resin component of the hard coat forming material (total amount of component (A) and component (B), including the total amount of Z-added resin material if any). 70 ⁇ 95% by weight is preferred 80 ⁇
- the isocyanuric acid acrylate (B) of the present invention includes an isocyanuric acid resin having at least one (meth) acrylate group.
- an isocyanuric acid resin having at least one (meth) acrylate group for example,
- R is a (meth) atallyloyl group or H, and n is an integer of 1 to 5, provided that at least one of R is a (meth) attalyloyl group].
- n is preferably in the range of 1 to 5, more preferably in the range of 2 to 3.
- At least one R may be a (meth) attaroyl group, but all are preferably (meth) attaloyl groups.
- the amount of isocyanuric acid acrylate (B) is not particularly limited, but it is preferably 5 to 25 parts by weight per 100 parts by weight of urethane acrylate (HA). More preferably, it is 8 to 23 parts by weight. Isocyanuric acid acrylate (B) is 25 weight When exceeding the part, flexibility is inferior, which is not preferable. Further, when the amount is less than 5 parts by weight, sufficient hardness cannot be obtained, which is preferable.
- the inorganic ultrafine particles (C) include titanium oxide, silicon oxide, acid aluminum, acid oxide zinc, tin oxide, acid zirconium, acid calcium, indium oxide, acid oxide. Antimony power S can be increased. These composites can also be used. Of these, titanium oxide, acid carbonate (silica), acid aluminum, zinc oxide, tin oxide, and acid zirconium are preferable. These ultrafine particles (C) may be used alone or in combination of two or more.
- the average particle size of the inorganic ultrafine particles (C) is preferably lOOnm or less! /. When the average particle size exceeds 10 Onm, light scattering occurs, and the transmittance of the hard coat layer is lowered or colored, which is not preferable in terms of transparency.
- the average particle size of the inorganic ultrafine particles (C) is preferably 50 nm or less, and more preferably 30 nm or less.
- the blending amount of the inorganic ultrafine particles (C) is preferably about 10 to 60% by weight based on the total amount of the resin component of the hard coat forming material. More preferably, it is 30 to 45% by weight.
- the blending amount of the inorganic ultrafine particles (C) is more than 60% by weight based on the total amount of the resin component of the hard coat forming material, the ultrafine particles are aggregated and the same disadvantages as described above are generated immediately. The Moreover, since coating property worsens, it is not preferable. On the other hand, a ratio of less than 10% by weight is not preferable because the generation of a force tends to increase.
- the inorganic ultrafine particles (C) have a function of adjusting the apparent refractive index of the hard coat layer according to the blending amount.
- the refractive index of the transparent plastic film substrate and the refractive index of the hard coat layer are preferably approximated. Therefore, in preparing the hard coat layer forming material, the inorganic ultrafine particles (C) are blended so that the difference (d) between the refractive index of the transparent plastic film substrate and the refractive index of the hard coat layer is reduced. It is preferable to adjust the amount accordingly.
- the refractive index difference (d) is large, a phenomenon called interference fringes in which reflected light of external light incident on the hard coat film exhibits an iridescent hue occurs, and the display quality is deteriorated.
- three-wavelength fluorescent lamps have increased greatly as fluorescent lamps.
- Three-wavelength fluorescent lamps have the characteristic that objects with strong emission intensity at a specific wavelength can be clearly seen. It has been found that interference fringes further appear under the lights.
- the refractive index difference (d) is preferably 0.04 or less. More preferably, it is 0.02 or less.
- titanium oxide is used as the inorganic ultrafine particles (C), and this is used for the entire hard coat forming material.
- the refractive index difference (d) of the polyethylene terephthalate film with respect to the refractive index of about 1.64 can be controlled to 0.04 or less, and the generation of interference fringes is suppressed. be able to.
- the hard coat forming material of the examples uses acid ultrafine particles (C), which are used as a node coat forming material.
- C acid ultrafine particles
- the hard coat forming material may contain a reactive diluent.
- the reactive diluent constitutes the rosin component.
- Examples of reactive diluents include 1,6-hexanediol di (meth) acrylate, tripropylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, and hexane diol di (meth) acrylate.
- Bifunctional or higher-functional monomers and oligomers such as phthalate, pentaerythritol tetra (meth) acrylate, trimethylol propane tri (meth) acrylate, dipentaerythritol hex (meth) acrylate, neopentyl alcohol recall di (meth) acrylate can give.
- acrylic acid esters such as N-butylpyrrolidone, ethyl acrylate, propyl acrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, butyl methacrylate, hexyl methacrylate, Methacrylic acid esters such as isooctyl methacrylate, 2-hydroxyethyl methacrylate, cyclohexyl methacrylate, norphenyl methacrylate, tetrahydrofurfuryl methacrylate, and derivatives thereof Prolatatone derivatives Monofunctional monomers such as styrene, a- methylstyrene, acrylic acid, and the like, and mixtures thereof can be used. These reactive diluents are 15 parts by weight or less, and 10 parts by weight per 100 parts by weight of urethane acrylate (A). It is preferable to use it in an amount of less than an amount
- the hard coat forming material can be cured by thermal curing, ionizing radiation curing such as ultraviolet rays, and various polymerization initiators can be used depending on the curing means.
- ionizing radiation curing such as ultraviolet rays
- various polymerization initiators can be used depending on the curing means.
- ultraviolet rays are used as the curing means, a conventionally known photopolymerization initiator can be used.
- benzoin and its alkyl ethers such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, N, N, N, N tetramethyl-4,4'-daminobenzophenone, benzyl methyl ketal; —Acetophenones such as methylacetophenone, 4-cyclopentabenzophenone, 4, 4'-dimethoxybenzophenone, 2, 2-dimethoxy 2-phenol-acetophenone, 1-hydroxycyclohexyl phenol ketone; methylanthraquinone, 2— Anthraquinones such as ethylanthraquinone and 2-amylanthraquinone; xanthone; thixanthones such as thixanthone, 2,4 jetylthioxanthone and 2,4 diisopropylthixanthone; acetofenone dimethyl ketal
- the amount of the photopolymerization initiator used is preferably about 5 parts by weight or less, more preferably 1 to 4 parts by weight with respect to the total resin component of the hard coat forming material ⁇ total amount of component (A) and component (B) ⁇ . .
- leveling agents can be added to the node coat forming material.
- a fluorine-based or silicone-based leveling agent it is preferable to select and use a fluorine-based or silicone-based leveling agent as appropriate. More preferred is a silicone leveling agent.
- the silicone leveling agent include polydimethylsiloxane, polyether-modified polydimethylsiloxane, and polymethylalkylsiloxane.
- the amount of the fluorine-based or silicone-based leveling agent is 5 parts by weight or less, and further 0.01 to 5 parts by weight with respect to 100 parts by weight of the total resin component of the hard coat layer forming material. Is preferred.
- the leveling agent In the case where ultraviolet rays are used as the means for curing the hard coat forming material, if the leveling agent is oriented to the node coat forming material, the leveling agent bleeds to the air interface during preliminary drying and solvent drying. Therefore, the hardness of UV curable resin with oxygen The hard coat layer having sufficient hardness on the outermost surface can be obtained. In addition, since the silicone leveling agent is provided with slipperiness by bleeding on the surface of the hard coat layer, the scratch resistance can be improved.
- the hard coat forming material may be a pigment, a filler, a dispersant, a plasticizer, an ultraviolet absorber, a surfactant, an antioxidant, a thixotropic lubricant as long as it does not impair performance. Etc. may be used. These may be used alone or in combination of two or more.
- the hard coat film of the present invention is produced by forming a hard coat layer, which is a cured coating layer, on at least one surface of a transparent plastic film substrate by applying the hard coat forming material and then curing.
- the hard coat forming material can be applied as a solution dissolved in a solvent. When the hard coat forming material is applied as a solution, it hardens after drying.
- Examples of the solvent include ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone cyclopentanone, and cyclohexanone; esters such as ethyl acetate and butyl acetate; alcohols such as isopropyl alcohol and ethyl alcohol.
- Aromatic hydrocarbons such as benzene, toluene, xylene, methoxybenzene, 1,2-dimethoxybenzene; , Halogenated hydrocarbons such as trichloroethylene, tetrachloroethylene, and black benzene.
- These solvents can be used alone or in combination of two or more.
- the solid concentration of the solution is usually 70% by weight or less, more preferably 30 to 60% by weight.
- the means for curing the hard coat forming material is not particularly limited, but ionizing radiation curing is preferable.
- ultraviolet rays capable of using various active energies are suitable.
- energy ray sources include high-pressure mercury lamps, halogen lamps, xenon lamps, metallo lamps, ride lamps, nitrogen lasers, electron beam accelerators, radioactive element lines, etc. Source is preferred.
- the irradiation amount of the energy ray source is preferably 50 to 5000 mjZcm 2 as an integrated exposure amount at an ultraviolet wavelength of 365 nm. When the irradiation amount is less than 50 miZcm 2 , the hardness of the hard coat layer may be lowered because of insufficient curing. On the other hand, if it exceeds 5000 mjZcm 2 , the hard coat layer is colored and the transparency is lowered.
- the thickness of the hard coat layer which is a cured coating layer obtained by curing the hard coat forming material, is not particularly limited, but is preferably 15 to 50 / ⁇ ⁇ as described above.
- the thickness of the node coat layer is more preferably 20 to 45 ⁇ m. If the thickness is less than 15 ⁇ m, the hardness tends to decrease. If the thickness is more than 50 m, the hard coat layer itself may crack, or the hard coat film may curl on the hard coat surface due to the hard coat shrinkage. is there.
- An antireflection layer may be provided on the hard coat layer. When light strikes an object, it repeatedly passes through the back of the object by repeatedly reflecting at the interface, absorbing inside, and scattering. When a hard coat film is attached to an image display device, one of the factors that lower the image visibility is the reflection of light at the interface between air and the hard coat layer. The antireflection layer reduces its surface reflection.
- an optical thin film (antireflection layer) whose thickness and refractive index are strictly controlled is laminated on the surface of the coated layer. This is a method of expressing the antireflection function by canceling out the reversed phases of incident light and reflected light using the light interference effect.
- each layer of the optical thin film is generally formed by a dry method such as vacuum deposition, sputtering, or CVD.
- Examples of the material for forming the antireflection layer include titanium oxide, zirconium oxide, and silicon oxide. Magnesium fluoride or the like can be used.
- a laminate of an acid titanium layer and an acid key layer As the laminate, a titanium oxide layer having a high refractive index (refractive index: about 1.8) is formed on the hard coat layer, and a silicon oxide layer having a low refractive index (refractive index) is formed on the titanium oxide layer. : Approximately 1.45), and a four-layer laminate in which an acid titanium layer and an acid key layer are formed in this order on the two-layer laminate. Is preferred ⁇ .
- the reflectance is minimized under the condition that the above relational expression is satisfied.
- the thickness of the antireflection layer that minimizes the reflectance is 95 nm with respect to incident light having a wavelength of 550 nm in visible light.
- the wavelength region of visible light that exhibits the antireflection function is 380 to 780 nm, and the wavelength region with particularly high visibility is in the range of 450 to 650 nm, and the reflectance at 550 nm, which is the central wavelength, is minimized. It is a common practice to perform design.
- the thickness accuracy is within ⁇ 10% of the design thickness, which is not as strict as the thickness accuracy of the multilayer antireflection coating, that is, when the design wavelength is 95 nm. If it is in the range of 86 nm to 105 nm, it can be used without any problem. For this reason, in general, wet methods such as fountain coating, die coating, spin coating, spray coating, gravure coating, roll coating, and bar coating are used to form a single antireflection layer. ing.
- a material for forming the antireflection layer as a single layer for example, a resin material such as an ultraviolet curable acrylic resin, or a nano- or IBRIBZ in which inorganic fine particles such as colloidal silica are dispersed in the resin is used.
- sol-gel materials using metal alkoxides such as tetraethoxysilane and titanium tetraethoxide.
- each material may be a fluorine group-containing compound in order to impart antifouling properties to the surface. From the viewpoint of scratch resistance, low refractive index layer materials with a high content of inorganic components tend to be superior, and sol-gel materials are particularly preferred.
- Sol-gel materials can be used after partial condensation.
- sol-gel material containing a fluorine group examples include perfluoroalkylalkoxysilane.
- perfluoroalkylalkoxysilane for example, a general formula: CF (CF) CH CH Si (OR) (wherein R represents an alkyl group having 1 to 5 carbon atoms)
- n represents an integer of 0 to 12).
- trifluoropropyltrimethoxysilane, trifluoropropyltriethoxysilane, tridecafluorooctyltrimethoxysilane, tridecafluorooctyltriethoxysilane, heptadecafluorodecyl examples include trimethoxysilane and heptadecafluorodecyltriethoxysilane. Of these, compounds having n of 2 to 6 are preferred.
- the inorganic fine particles used as the material for forming the antireflection layer it is preferable to use hollow and spherical acid ultrafine particles.
- Hollow spherical oxide silicon ultrafine particles preferably have an average particle diameter of about 5 to 300 nm, and the ultrafine particles are hollow spheres in which cavities are formed inside the outer shells having pores.
- the cavity contains the solvent and Z or gas at the time of preparation of the fine particles. It is preferable that a precursor material for forming the cavity remains in the cavity.
- the thickness of the outer shell is preferably in the range of about 1 to 50 nm and the average particle diameter is preferably in the range of about 1Z50 to 1Z5.
- the outer shell is preferably composed of a plurality of coating layers. It is preferable that the pores are closed and the cavity is sealed by the outer shell.
- a porous or hollow structure is maintained, and the refractive index of the antireflection layer can be reduced, so that it can be preferably used.
- the average particle size of the hollow spherical ultrafine silicon oxide particles is about 5 to 300 nm. If the average particle diameter is less than 5 nm, the volume ratio of the outer shell in the spherical fine particles tends to increase and the volume ratio of the cavity tends to decrease, whereas if the average particle diameter exceeds 300 nm, it becomes difficult to obtain a stable dispersion. Moreover, the transparency of the antireflection layer containing the ultrafine particles is likely to be lowered. Power is also.
- the hollow and spherical ultrafine silicon oxide particles are preferred, and the average particle size is in the range of 10 to 200 nm.
- the average particle diameter can be determined by a dynamic light scattering method.
- the method for producing hollow and spherical ultrafine silicon oxide particles includes, for example, the following steps (a) to (c). Hollow, spherical ultrafine silica particles are obtained as a dispersion.
- a method for producing such hollow, spherical, ultrafine oxide silica particles for example, the method for producing silica-based fine particles disclosed in JP-A-2000-233611 is suitably employed.
- MO ZSiO molar ratio of other inorganic compounds expressed in MO
- a step of preparing a nuclear particle dispersion is a step of preparing a nuclear particle dispersion.
- An antireflection-forming coating solution can be prepared by mixing the dispersion of the hollow and spherical ultrafine silicon oxide particles with various matrix components.
- the various matrix components refer to components that can form a film on the surface of the hard coat layer, and can be selected and used in accordance with conditions such as adhesion to the hard coat layer, hardness, and coatability. .
- polyester resin acrylic resin, urethane resin, vinyl chloride resin, epoxy resin, melamine resin, fluorine resin, silicone resin, petital resin, phenolic resin
- vinyl acetate resin UV curable resin, electron beam curable resin, emulsion resin, water-soluble resin, hydrophilic resin, mixtures of these resins, and copolymers and modified products of these resins.
- organic resin is mentioned.
- sol-gel material exemplified as the material for forming the antireflection layer with the single layer can be used as the matrix component.
- the hollow and spherical acid obtained by replacing water as a dispersion medium of the silicon carbide ultrafine particles with an organic solvent such as alcohol. If necessary, the ultrafine particles are treated with a known coupling agent and then dispersed in an organic solvent. The organic solvent dispersion and the matrix can be diluted with an appropriate organic solvent to form an antireflection coating solution.
- a sol-gel material for example, by mixing water and an acid or alkali as a catalyst in a mixed solution of a metal alkoxide such as alkoxysilane and an alcohol. Then, a partially hydrolyzed product such as alkoxysilane is obtained, and the dispersion is mixed therewith, and diluted with an organic solvent as necessary to obtain a coating solution.
- a metal alkoxide such as alkoxysilane and an alcohol.
- the refractive index of the antireflection layer formed on the surface of the hard coat layer varies depending on the mixing ratio of the ultrafine silicon oxide particles and the matrix component and the refractive index of the matrix used. ⁇ 1.42 and low refractive index.
- the refractive index of the ultrafine silicon oxide particles of the present invention is 1.2-1.38.
- An antireflection hard coat film in which an antireflection layer is provided on the hard coat layer of the hard coat film is preferable in terms of pencil hardness.
- the surface of the hard coat layer containing the pre-ultra fine particles (C) has micro unevenness, which affects the sliding of the pencil (the pencil is easy to pull and transmit force).
- the antireflection layer is provided, the unevenness becomes smooth, and a hard coat layer having a pencil hardness of about 3H can usually have a pencil hardness of 4H.
- the antireflection layer is frequently mounted on the outermost surface of the image display device, it is easily contaminated by the external environment.
- fingerprints, dirt, sweat, hairdressing, and other contaminants may adhere to the surface, and the surface reflectance may change as soon as it adheres, or the display will appear white and appear blurred.
- Contamination is more conspicuous compared to simple transparent plates I'm going to In such a case, a fluorine group-containing silane-based compound, a fluorine group-containing organic compound, or the like can be laminated on the antireflection layer in order to provide the functions relating to the anti-adhesion property and easy removal property.
- the transparent plastic film substrate and the hard coat layer are subjected to various surface treatments, whereby the transparent plastic film substrate, the hard coat layer, The adhesion between the hard coat layer and the antireflection layer can be improved.
- the surface treatment low-pressure plasma treatment, ultraviolet irradiation treatment, corona treatment, flame treatment, acid or alkali treatment can be used. Further, as the surface treatment when triacetyl cellulose is used as a transparent plastic film substrate, an alkali treatment is preferable.
- the alkali hatching treatment is preferably carried out in a cycle in which the surface of the triacetyl cell mouth one film is crushed in an alkali solution, then washed with water and dried.
- the alkaline solution include a potassium hydroxide solution and a sodium hydroxide solution, and the specified concentration of hydroxide ions is preferably 0.1 to 3N, and more preferably 0.5N to 2N. preferable.
- the alkaline solution temperature is preferably in the range of 25 to 90 ° C, more preferably 40 to 70 ° C. Thereafter, washing treatment and drying treatment are performed to obtain a surface-treated triacetyl cellulose.
- Hard coat film and antireflection hard coat film are usually used by sticking the transparent plastic film substrate side to the surface of CRT, LCD, PDP, ELD with adhesive or adhesive. Can do.
- Hard coat films and antireflection hard coat films are usually bonded on the transparent plastic film substrate side to optical elements used in LCDs and ELDs via adhesives and adhesives. Can do. In bonding, the transparent plastic film substrate can be subjected to the same surface treatment as described above.
- Examples of the optical element include a polarizer and a polarizing plate.
- a polarizing plate having a transparent protective film on one side or both sides of a polarizer is generally used.
- the transparent protective films on the front and back sides may be the same material or different materials.
- the polarizing plates are usually disposed on both sides of the liquid crystal cell. Usually, the polarizing plate is so that the absorption axes of the two polarizing plates are substantially orthogonal to each other. Be placed.
- the polarizer is not particularly limited, and various types can be used.
- polarizers include hydrophilic polymer films such as polybulal alcohol film, partially formalized polybulal alcohol film, and ethylene / acetate copolymer partial ken film, iodine and dichroic dyes, etc. And uniaxially stretched by adsorbing these dichroic substances, and polyylene-based oriented films such as dehydrated polyvinyl alcohol and dehydrochlorinated polyvinyl chloride.
- a polarizer that has a dichroic substance power such as a polybutyl alcohol film and iodine is preferable.
- the thickness of these polarizers is not particularly limited. Generally, the thickness is about 5 to 80 m.
- a polarizer obtained by dyeing a polyvinyl alcohol film with iodine and uniaxially stretching it is prepared, for example, by dyeing polyvinyl alcohol in an aqueous solution of iodine and stretching it 3 to 7 times the original length. Can do. If necessary, it can be immersed in an aqueous solution of boric acid or potassium iodide. If necessary, the polybulal alcohol film may be immersed in water and washed before dyeing. In addition to washing the polybulal alcohol film surface with dirt and anti-blocking agents by washing the polybulal alcohol film, it is uneven due to swelling of the polybulu alcohol film. There is also an effect to prevent.
- the stretching may be performed after dyeing with iodine, may be performed while dyeing, or may be stretched and dyed with iodine.
- the film can be stretched in an aqueous solution of boric acid or potassium iodide or in a water bath.
- the polarizer is usually used as a polarizing plate with a transparent protective film provided on one side or both sides.
- the transparent protective film preferably has excellent transparency, mechanical strength, thermal stability, moisture shielding properties, and isotropic properties.
- the material for forming the transparent protective film include polyester-based resins such as polyethylene terephthalate and polyethylene naphthalate, cellulose-based resins such as diacetyl cellulose and triacetyl cellulose, acrylic resins such as polymethyl methacrylate, polystyrene, Styrene resins such as acrylonitrile styrene copolymer, acrylo-tolyl butadiene styrene copolymer, acrylonitrile ethylene styrene copolymer, styrene 'maleimide copolymer, styrene' maleic anhydride copolymer Film made of transparent resin such as polycarbonate resin .
- olefinic resin such as ethylene'propylene copolymer
- salt-bulu resin such as nylon or aromatic polyamide
- amide resin such as nylon or aromatic polyamide
- An example is a film made of a transparent resin.
- imide-based resins such as aromatic polyimides, polyimide amides, sulfone-based resins, polyethersulfone-based resins, polyetheretherketone-based resins, polyethylene-based resin resins, vinyl alcohol-based resins, salty resins
- a film made of a transparent resin such as a vinylidene resin, a vinyl propylar resin, an arylate resin, a polyoxymethylene resin, an epoxy resin, and a blend of the above resins.
- a polymer film described in JP-A-2001-343529 for example, (A) a thermoplastic resin having a substituted side chain and a Z or non-midamide group, and (B) side Examples thereof include a resin composition containing a thermoplastic resin having a substituted and Z or unsubstituted fullyl and -tolyl group in the chain.
- a specific example is a film of a resin composition containing an alternating copolymer of isobutylene and N-methylmaleimide and an acrylonitrile / styrene copolymer.
- a strong film such as a mixed extruded product of the resin composition can be used.
- These films have a small phase difference and a small photoelastic coefficient, so when applied to a protective film such as a polarizing plate, it is possible to eliminate defects such as unevenness due to distortion. Excellent in properties.
- Examples of the transparent protective film include cellulose-based resins such as triacetyl cellulose and norbornene-based resins from the viewpoint of polarization characteristics and durability.
- Cellulose-based resin is a product name “Fujitac” manufactured by Fuji Photo Film Co., Ltd.
- norbornene-based resin is a product name manufactured by Nippon Zeon Co., Ltd.
- the product name “Arton” is listed.
- the thickness of the transparent protective film is a force that can be determined as appropriate. Generally, it is about 1 to 500 / ⁇ ⁇ in terms of workability such as strength and handleability, and thin layer properties. More preferably, 5 to 200 / ⁇ ⁇ is preferable, and 10 to 150 / ⁇ ⁇ is more preferable. Within the above range, the polarizer is mechanically protected, and the polarizer does not shrink even when exposed to high temperature and high humidity, and stable optical characteristics can be maintained.
- a protective film having a retardation value of ⁇ 90 nm to +75 nm is preferably used.
- the thickness direction retardation value (Rth) is more preferably ⁇ 80 nm to +60 nm, and particularly preferably ⁇ 70 nm to +45 nm.
- the transparent protective film has an optimized retardation value because the retardation value in the film plane and the retardation value in the thickness direction may affect the viewing angle characteristics of the liquid crystal display device. Is preferably used. However, a transparent protective film for which optimization of the retardation value is desired is a transparent protective film that is laminated on the surface of the polarizer on the side close to the liquid crystal cell, and is laminated on the surface of the polarizer on the side far from the liquid crystal cell. The transparent protective film does not change the optical characteristics of the liquid crystal display device.
- the retardation value of the transparent protective film laminated on the surface of the polarizer on the side close to the liquid crystal cell is 0. It is preferably ⁇ 5nm. More preferably, it is 0-3 nm. More preferably, it is 0 to lnm.
- the retardation value (Rth) in the thickness direction is preferably 0 to 15 nm. More preferably, it is 0 to 12 nm. More preferably, 0 to: LOnm. Particularly preferably, it is 0 to 5 nm. Most preferably, it is 0 to 3 nm.
- the polarizing plate on which a hard coat film or the like is laminated may be a laminate in which a transparent protective film, a polarizer, and a transparent protective film are sequentially laminated on a hard coat film, or a polarizer and a transparent on a hard coat film. It may be a laminate of protective films one after another.
- the transparent protective film polarizer may not be bonded! /
- the surface of the hard coat layer may be subjected to treatment for preventing sticking or for the purpose.
- the hard coat treatment is applied for the purpose of preventing scratches on the polarizing plate surface.
- a hardened film with excellent hardness and slipping properties by an appropriate UV-curable resin such as acrylic or silicone is transparent. It can be formed by a method of adding to the surface of the protective film.
- the anti-sticking treatment is performed for the purpose of preventing adhesion between adjacent layers.
- the hard coat layer The anti-sticking layer and the like can be provided on the transparent protective film itself, and can also be provided separately from the transparent protective film as an optical layer.
- a hard coat layer, a primer layer, an adhesive layer, an adhesive layer, an antistatic layer, a conductive layer, a gas barrier layer, a water vapor barrier layer, a moisture barrier layer, or the like is inserted between the layers of the polarizing plate. It may be laminated on the surface of the plate. Also. In the step of forming each layer of the polarizing plate, for example, conductive particles or antistatic agents, various fine particles, plasticizer, etc. may be added to the material for forming each layer, and may be improved as necessary. .
- the method of laminating the transparent protective film with the polarizer is not particularly limited.
- an adhesive having an acrylic polymer or a butyl alcohol polymer, boric acid, borax, glutaraldehyde, melamine oxalic acid, or the like. This can be carried out via an adhesive comprising at least a water-soluble crosslinking agent of the butyl alcohol polymer.
- the adhesive it is preferable to use a polyvinyl alcohol-based adhesive from the viewpoint of excellent adhesiveness with polyvir alcohol which is a raw material of the polarizer.
- the polymer film containing the norbornene-based resin is used as a transparent protective film, and as a pressure-sensitive adhesive when laminated with a polarizer, it can be used as a thin layer having excellent transparency and low birefringence. Those capable of exhibiting adhesive strength are preferred.
- pressure-sensitive adhesives include adhesives for dry lamination that mix polyurethane resin solution and polyisocyanate resin solution, styrene butadiene rubber adhesive, epoxy two-component curable adhesive, For example, epoxy resin and polythiol can be used as a two-component, epoxy resin and polyamide can be used as a two-component, especially solvent-based adhesives and epoxy two-component curable adhesives. A preferable transparent one is preferable.
- Some adhesives can be improved in adhesion by using an appropriate adhesive primer. When using such an adhesive, it is preferable to use an adhesive primer.
- the adhesive primer is not particularly limited as long as it is a layer capable of improving adhesiveness.
- reactivity such as amino group, vinyl group, epoxy group, mercapto group, chloro group, etc. in the same molecule.
- Nate coupling agents and so-called coupling agents such as aluminate coupling agents having a hydrolyzable hydrophilic group containing aluminum in the same molecule and an organic functional group, epoxy resin, isocyanate
- a resin having an organic reactive group such as a resin, a urethane-based resin, and an ester-urethane-based resin can be used. Above all, it handles industrially
- a layer containing a silane coupling agent is preferred.
- an optical film in which another optical element (optical layer) is laminated on the polarizing plate can be used.
- the optical layer is not particularly limited.
- it can be used for the formation of liquid crystal display devices such as reflectors, transflectors, retardation plates (including wavelength plates such as 1Z2 and 1Z4), and viewing angle compensation films.
- One or more optical layers that may be used can be used.
- a reflective polarizing plate or a semi-transmissive polarizing plate in which a polarizing plate is further laminated with a reflecting plate or a semi-transmissive reflecting plate, an elliptical polarizing plate or a circular polarizing plate in which a retardation plate is further laminated on a polarizing plate,
- a wide viewing angle polarizing plate obtained by further laminating a viewing angle compensation film on the polarizing plate, or a polarizing plate obtained by further laminating a brightness enhancement film on the polarizing plate is preferable.
- a hard coat film is provided on the polarizing plate side.
- the reflective polarizing plate is a polarizing plate provided with a reflective layer, and is used to form a liquid crystal display device or the like of a type that reflects incident light from the viewing side (display side).
- a liquid crystal display device or the like of a type that reflects incident light from the viewing side (display side).
- the reflective polarizing plate can be formed by an appropriate method such as a method in which a reflective layer made of metal or the like is provided on one surface of the polarizing plate via the transparent protective film or the like, if necessary.
- a reflective layer is formed by attaching a foil vapor deposition film made of a reflective metal such as aluminum on one side of a transparent protective film matted as necessary. Etc.
- the reflecting plate can also be used as a reflection sheet in which a reflection layer is provided on an appropriate film according to the film. Since the reflective layer is usually made of metal, the usage pattern in which the reflective surface is covered with a transparent protective film or polarizing plate prevents the reflectance from being lowered due to oxidation, and thus the initial reflectance is long-term. It is more preferable in terms of sustainability and avoiding the separate provision of a protective layer.
- the transflective polarizing plate can be obtained by using a transflective reflective layer such as a half mirror that reflects and transmits light in the reflective layer.
- the transflective polarizing plate is usually provided on the back side of the liquid crystal cell.
- the incident light from the viewing side is reflected to display an image.
- it can be formed into a liquid crystal display device of a type that displays an image by using a built-in light source such as a backlight that is built in the back side of a transflective polarizing plate, relatively in an atmosphere.
- the transflective polarizing plate can save energy when using a light source such as a knocklight in a bright atmosphere, and can be used with a built-in light source in a relatively low atmosphere. It is useful for the formation of
- a phase difference plate or the like is used when changing linearly polarized light into elliptically or circularly polarized light, changing elliptically or circularly polarized light into linearly polarized light, or changing the polarization direction of linearly polarized light.
- a so-called 1Z4 wavelength plate also called a ⁇ 4 plate
- a 1Z2 wavelength plate (also referred to as ⁇ 2 plate) is usually used to change the polarization direction of linearly polarized light.
- the elliptically polarizing plate compensates (prevents) coloring (blue or yellow) caused by double bending of the liquid crystal layer of the super twist nematic (STN) type liquid crystal display device, and displays the above-mentioned coloring! It is used effectively in some cases. Further, the one having a controlled three-dimensional refractive index is preferable because it can compensate (prevent) coloring that occurs when the screen of the liquid crystal display device is viewed from an oblique direction.
- the circularly polarizing plate is effectively used, for example, when adjusting the color tone of an image of a reflective liquid crystal display device in which the image is displayed in color, and also has an antireflection function.
- the above-mentioned retardation plate include polycarbonate, polybutyl alcohol, polystyrene, polymethyl metatalylate, polypropylene and other polyolefins, polyarylate, poly Examples thereof include a birefringent film obtained by stretching a film having an appropriate polymer strength such as amide, a liquid crystal polymer alignment film, and a liquid crystal polymer alignment layer supported by the film.
- the retardation plate may have an appropriate retardation according to the purpose of use, such as those for the purpose of compensating for viewing angles, etc., due to the birefringence of various wavelength plates and liquid crystal layers, and two or more types of retardation plates may be used. It is also possible to control the optical characteristics such as retardation by laminating the above retardation plates.
- the elliptically polarizing plate and the reflective elliptical polarizing plate are obtained by laminating a polarizing plate or a reflective polarizing plate and a retardation plate in an appropriate combination.
- a powerful elliptical polarizing plate or the like can also be formed by laminating them separately in the manufacturing process of the liquid crystal display device so as to be a combination of a (reflection type) polarizing plate and a retardation plate.
- an optical film such as an elliptically polarizing plate is excellent in stability of quality and laminating workability, and has an advantage of improving the manufacturing efficiency of a liquid crystal display device.
- the viewing angle compensation film is a film for widening the viewing angle so that the image can be seen relatively clearly even when the screen of the liquid crystal display device is viewed in a slightly oblique direction rather than perpendicular to the screen.
- a viewing angle compensation retardation plate include a retardation film, an alignment film such as a liquid crystal polymer, and a support in which an alignment layer such as a liquid crystal polymer is supported on a transparent substrate.
- a normal retardation plate uses a birefringent polymer film uniaxially stretched in the plane direction, whereas a retardation plate used as a viewing angle compensation film is biaxially stretched in the plane direction.
- Birefringent polymer films biaxially stretched films such as polymer films and birefringent films that have birefringence with a controlled refractive index in the thickness direction, uniaxially stretched in the plane direction and stretched in the thickness direction Etc. are used.
- the tilted orientation film include a heat-shrinkable film adhered to a polymer film and the polymer film stretched or Z and shrunk under the action of its contraction force by heating, or a liquid crystal polymer obliquely oriented.
- the raw material polymer for the phase difference plate is the same as the polymer described in the previous phase difference plate, preventing coloration due to a change in the viewing angle based on the phase difference of the liquid crystal cell and expanding the viewing angle for good viewing. Anything suitable for such purposes can be used.
- the alignment layer of the liquid crystal polymer can be obtained because it achieves a wide viewing angle with good visibility.
- An optically compensated phase difference plate in which an optically anisotropic layer composed of an inclined alignment layer of a sotic liquid crystal polymer is supported by a triacetylcellulose film can be preferably used.
- a polarizing plate obtained by bonding a polarizing plate and a brightness enhancement film is usually provided on the back side of a liquid crystal cell.
- the brightness enhancement film reflects the linearly polarized light with a predetermined polarization axis or circularly polarized light in a predetermined direction when natural light is incident due to a backlight of a liquid crystal display device or the like, or reflection from the back side, and transmits other light.
- a polarizing plate in which a brightness enhancement film is laminated with a polarizing plate allows light from a light source such as a backlight to be incident to obtain transmitted light in a predetermined polarization state, and reflects light without transmitting the light other than the predetermined polarization state. Is done.
- the light reflected on the surface of the brightness enhancement film is further inverted through a reflective layer provided behind the brightness enhancement film and reincident on the brightness enhancement film, and part or all of the light is transmitted as light having a predetermined polarization state.
- a reflective layer provided behind the brightness enhancement film and reincident on the brightness enhancement film, and part or all of the light is transmitted as light having a predetermined polarization state.
- the light having a polarization direction that does not coincide with the polarization axis of the polarizer is It is almost absorbed by the polarizer and does not pass through the polarizer. That is, although depending on the characteristics of the polarizer used, approximately 50% of the light is absorbed by the polarizer, and the amount of light that can be used for liquid crystal image display or the like is reduced accordingly, resulting in a dark image.
- the brightness enhancement film allows light having a polarization direction that is absorbed by the polarizer to be reflected by the brightness enhancement film without being incident on the polarizer, and further through a reflective layer or the like provided behind the brightness enhancement film.
- Inverting and re-entering the brightness enhancement film is repeated, and only the polarized light whose polarization direction is such that the polarization direction of the light reflected and inverted between the two can pass through the polarizer is obtained. Is transmitted to the polarizer so that light such as a backlight can be efficiently used for displaying images on the liquid crystal display device, and the screen can be brightened.
- a diffusion plate may be provided between the brightness enhancement film and the reflective layer.
- the polarized light reflected by the brightness enhancement film is directed to the reflection layer and the like, but the installed diffuser diffuses the light passing therethrough at the same time and simultaneously cancels the polarization state to become a non-polarized state. That is, the diffuser plate returns the polarized light to the original natural light state.
- This unpolarized state i.e. The light in the light state is directed to the reflection layer, reflected through the reflection layer, etc., and again passes through the diffusion plate and re-enters the brightness enhancement film.
- the brightness of the display screen is maintained while at the same time reducing the unevenness of the brightness of the display screen.
- a dielectric multilayer thin film or a multilayer laminate of thin film films having different refractive index anisotropies transmits linearly polarized light having a predetermined polarization axis and transmits other light.
- Reflecting the cholesteric liquid crystal polymer alignment film or its alignment liquid crystal layer supported on a film substrate, reflecting either the left-handed or right-handed circularly polarized light and transmitting the other light Appropriate things such as those showing the characteristics to be used can be used.
- the transmission light is directly incident on the polarization plate with the polarization axis aligned, thereby suppressing absorption loss due to the polarization plate.
- it can be transmitted efficiently.
- a brightness enhancement film of a type that transmits circularly polarized light such as a cholesteric liquid crystal layer
- it can be directly incident on a polarizer, but the circularly polarized light is linearly polarized through a retardation plate in order to suppress absorption loss. It is preferable to make it enter into a polarizing plate.
- circularly polarized light can be converted to linearly polarized light by using a 1Z4 wavelength plate as the retardation plate.
- a retardation plate that functions as a 1Z4 wavelength plate in a wide wavelength range such as the visible light region has, for example, a retardation layer that functions as a 1Z4 wavelength plate and other retardation characteristics for light light with a wavelength of 550 nm.
- the retardation plate disposed between the polarizing plate and the brightness enhancement film may have a retardation layer force of one layer or two or more layers.
- the cholesteric liquid crystal layer also reflects circularly polarized light in a wide wavelength range such as the visible light region by combining two or more layers with different reflection wavelengths in an overlapping structure. Based on this, it is possible to obtain transmitted circularly polarized light in a wide wavelength range.
- the polarizing plate may be formed by laminating a polarizing plate such as the above-described polarization-separating polarizing plate and two or more optical layers. Therefore, a reflective elliptical polarizing plate, a semi-transmissive elliptical polarizing plate, or the like, which is a combination of the above-described reflective polarizing plate, semi-transmissive polarizing plate, and retardation plate, may be used.
- Lamination of the hard coat film to the optical element, and further lamination of various optical layers to the polarizing plate can be performed by a method of sequentially laminating separately in the manufacturing process of a liquid crystal display device or the like. Those laminated in advance are excellent in quality stability and assembly work, and have the advantage of improving the manufacturing process of liquid crystal display devices and the like. Appropriate adhesion means such as an adhesive layer can be used for lamination. When bonding the polarizing plate and other optical films, their optical axes can be set at an appropriate arrangement angle in accordance with the target retardation characteristics.
- the surface on which the hard coat film is not provided an adhesive layer for adhering to other members such as a liquid crystal cell can be provided.
- the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is not particularly limited.
- an acrylic polymer, silicone polymer, polyester, polyurethane, polyamide, polyether, fluorine-based or rubber-based polymer is appropriately selected.
- an acrylic adhesive having excellent optical transparency, suitable wettability, cohesiveness and adhesive properties, and excellent weather resistance and heat resistance can be preferably used.
- a liquid crystal display device that prevents foaming and peeling due to moisture absorption, prevents optical characteristics from being deteriorated due to thermal expansion differences, prevents warping of the liquid crystal cell, and is high quality and has excellent durability. From the standpoint of formability, an adhesive layer having a low moisture absorption rate and excellent heat resistance is preferred.
- the adhesive or pressure-sensitive adhesive may contain a crosslinking agent according to the base polymer.
- the adhesive layer and the like are, for example, natural or synthetic fats, especially tackifiers, fillers or pigments made of glass fibers, glass beads, metal powders, other inorganic powders, coloring agents,
- An additive to be added to the pressure-sensitive adhesive layer such as an anti-oxidation agent may be contained. It may also be an adhesive layer containing fine particles and exhibiting light diffusivity!
- Attaching an adhesive layer to an optical element such as a polarizing plate or an optical film can be performed by an appropriate method.
- an adhesive solution of about 10 to 40% by weight is prepared by dissolving or dispersing a base polymer or a composition thereof in a solvent composed of a single solvent or a mixture of appropriate solvents such as toluene and ethyl acetate. Then, it is attached directly on the optical element by an appropriate spreading method such as a casting method or a coating method, or an adhesive layer is formed on the separator according to the above and transferred onto the optical element. The method to do.
- the adhesive layer can also be provided as an overlapping layer of different compositions or types in each layer.
- the thickness of the adhesive layer can be appropriately determined according to the purpose of use and adhesive strength, and is generally 1 to 500 m, preferably 5 to 200 111, particularly 10 to: LOO / zm force preferred! / ,.
- the exposed surface of the adhesive layer is temporarily covered with a ceno-router for the purpose of preventing contamination until it is put into practical use. This prevents contact with the adhesive layer under normal handling conditions.
- a ceno-router for example, an appropriate thin leaf body such as plastic film, rubber sheet, paper, cloth, non-woven fabric, net, foamed sheet, metal foil, laminate thereof, or the like may be used.
- an appropriate one according to the prior art such as those coated with an appropriate release agent such as a long-chain alkyl group or a fluorine-based molybdenum sulfide, can be used.
- the polarizer, transparent protective film, optical layer, etc. that form the optical element described above, and the adhesive layer, etc. each include, for example, a salicylic acid ester compound, a benzophenol compound, a benzoate.
- a triazole compound, a cyanoacrylate compound, a nickel complex salt compound, or the like that is treated with an ultraviolet absorber such as a compound may be provided with ultraviolet absorbing ability.
- the optical element provided with the hard coat film of the present invention can be preferably used for forming various devices such as a liquid crystal display device.
- the liquid crystal display device can be formed according to conventional methods. That is, a liquid crystal display device is generally formed by appropriately assembling components such as a liquid crystal cell, an optical element, and an illumination system as necessary, and incorporating a drive circuit. Except for the point of using the optical element according to the present invention, it can be based on the conventional method without any particular limitation.
- the liquid crystal cell any type such as a TN type, STN type, or ⁇ type can be used.
- An appropriate liquid crystal display device such as one using a backlight or a reflecting plate as a stem can be formed.
- the optical element according to the present invention can be placed on one or both sides of the liquid crystal cell.
- optical elements are provided on both sides, they may be the same or different.
- a single layer of appropriate parts such as a diffusing plate, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet, a light diffusing plate, a backlight, etc. Or two or more layers can be arranged.
- an organic electroluminescence device (organic EL display device) will be described.
- an organic EL display device is formed by sequentially laminating a transparent electrode, an organic light emitting layer, and a metal electrode on a transparent substrate to form a light emitting body (organic electroluminescent light emitting body).
- the organic light emitting layer is a laminate of various organic thin films, for example, a laminate of a hole injection layer made of a triphenylamine derivative and a light emitting layer made of fluorescent organic solid force such as anthracene, or Structures with various combinations, such as a laminate of such a light-emitting layer and a perylene derivative or other electron injection layer, or a stack of these hole injection layer, light-emitting layer, and electron injection layer Is known.
- an organic EL display device holes and electrons are injected into an organic light-emitting layer by applying a voltage to a transparent electrode and a metal electrode, and energy generated by recombination of these holes and electrons. Emits light on the principle that it excites the fluorescent material and emits light when the excited fluorescent material returns to the ground state.
- the mechanism of recombination in the middle is the same as that of a general diode, and as can be expected from this, the current and emission intensity show strong nonlinearity with rectification with respect to the applied voltage.
- an organic EL display device in order to extract light emitted from the organic light emitting layer, at least one of the electrodes must be transparent, and is usually formed of a transparent conductor such as indium tin oxide (ITO).
- ITO indium tin oxide
- a transparent electrode is used as the anode.
- metal electrodes such as Mg Ag and A1-Li are used.
- the organic light emitting layer is formed of a very thin film with a thickness of about lOnm. For this reason, the organic light emitting layer also emits almost the same light as the transparent electrode. Fully transparent. As a result, light that is incident on the surface of the transparent substrate when not emitting light, passes through the transparent electrode and the organic light emitting layer, and is reflected by the metal electrode again returns to the surface side of the transparent substrate. When viewed, the display surface of the OLED display looks like a mirror.
- an organic EL display device including an organic electroluminescent light emitting device including a transparent electrode on a front surface side of an organic light emitting layer that emits light when a voltage is applied and a metal electrode on a back surface side of the organic light emitting layer
- a polarizing plate can be provided on the surface side of the electrode, and a retardation plate can be provided between the transparent electrode and the polarizing plate.
- the retardation plate and the polarizing plate have a function of polarizing light incident from the outside and reflected by the metal electrode, the effect of preventing the mirror surface of the metal electrode from being visually recognized by the polarization action. is there.
- the retardation plate is a 1Z4 wavelength plate and the angle between the polarization directions of the polarizing plate and the retardation plate is adjusted to ⁇ Z4, the mirror surface of the metal electrode can be completely shielded.
- linearly polarized light is generally elliptically polarized by the retardation plate, but it is circularly polarized when the retardation plate is a 1Z4 wavelength plate and the angle between the polarization direction of the polarizing plate and the retardation plate is ⁇ ⁇ 4. .
- This circularly polarized light is transmitted through the transparent substrate, the transparent electrode, and the organic thin film, is reflected by the metal electrode, is again transmitted through the organic thin film, the transparent electrode, and the transparent substrate, and is linearly polarized again on the retardation plate. Become. And since this linearly polarized light is orthogonal to the polarization direction of the polarizing plate, it cannot be transmitted through the polarizing plate. As a result, the mirror surface of the metal electrode can be completely shielded.
- a 80 ⁇ m-thick triacetyl cellulose film (refractive index: 1.48) was used.
- Pentaerythritol acrylate and hydrogenated xylene diamine as urethane acrylate (A) 100 parts of urethane acrylate obtained from sulfonate, 20 parts of isocyanuric acid-tris [2- (atallyloyloxy) ethyl] as isocyanuric acid acrylate (B), and average particles as inorganic ultrafine particles (C) 40% ultrafine silica with a diameter of 10 to 20 nm with respect to the total solid content, 3% of the polymerization initiator (Ciba Specialty Chemicals, Irgacure 184) with respect to the total solid content, butyl acetate Z methyl
- a hard coat forming material (solution) was prepared by diluting with a mixed solvent of ethyl ketone (1Z2: weight ratio) to a solid content concentration of 45%.
- the hard coat layer forming material is applied to the surface of the transparent plastic film substrate with a bar coater, and the coating film is dried by heating at 100 ° C for 1 minute.
- a hard coat film in which a hard coat layer having a thickness of 20 m was formed was obtained by irradiating an ultraviolet ray with an integrated light quantity of 300 mj / cm 2 and curing.
- Example 1 in preparing the hard coat layer forming material, the amount of isocyanuric acid acrylate (B) used was changed to 10 parts by weight, and 8 parts by weight of pentaerythritol tetraatrate was added.
- a hard coat layer forming material was prepared in the same manner as in 1.
- a hard coat film was obtained in the same manner as in Example 1 except that the hard coat layer forming material was used and the thickness of the hard coat layer was changed to 18 m.
- a 75 ⁇ m-thick triacetyl cellulose film (refractive index: 1.65) was used.
- Example 1 in preparing the hard coat layer forming material, the ultrafine particle titanium oxide having an average particle size of 10 to 20 nm as inorganic ultrafine particles (C) was 36% A hard coat layer forming material was prepared in the same manner as in Example 1 except that was added. [0138] (Preparation of hard coat film)
- a hard coat film was obtained in the same manner as in Example 1, except that the transparent plastic film base material and the hard coat layer forming material were used and the thickness of the hard coat layer was changed to 21 ⁇ m.
- a hard coat film was obtained in the same manner as in Example 1 except that the thickness of the hard coat layer was changed to 42 m in Example 1.
- a hard coat film was obtained in the same manner as in Example 1 except that the thickness of the hard coat layer in Example 1 was changed to 31 ⁇ m.
- Example 1 in preparing the hard coat layer forming material, the amount of the inorganic ultrafine particles (C) was changed to 50% with respect to the total amount of the resin component. A coating layer forming material was prepared.
- a hard coat film was obtained in the same manner as in Example 1 except that the hard coat layer forming material was used and the thickness of the hard coat layer was changed to 19 m.
- Example 1 in preparing the hard coat layer forming material, the amount of the inorganic ultrafine particles (C) was changed to 20% with respect to the total amount of the resin component, and the hard coat layer was formed by the same method as in Example 1. A coating layer forming material was prepared.
- Example 8 A hard coat film was obtained in the same manner as in Example 1 except that the hard coat layer forming material was used in Example 1. [0145] Example 8
- Example 1 On the hard coat layer of the node coat film obtained in Example 1, the following anti-reflection layer forming material was applied with a bar coater and dried by heating at 120 ° C for 3 minutes. Then, it was cured to obtain an antireflection hard coat film having an antireflection layer having a thickness of 98 nm.
- Example 1 in preparation of the hard coat layer forming material, 36% of ultrafine oxide titanium oxide having an average particle size of 10 to 20 nm was added as inorganic ultrafine particles (C) to the total resin components.
- a hard coat layer forming material was prepared in the same manner as in Example 1 except that.
- a hard coat film was obtained in the same manner as in Example 1, except that the transparent plastic film base material and the hard coat layer forming material were used and the thickness of the hard coat layer was changed to 21 ⁇ m.
- Example 1 in preparation of the hard coat layer forming material, instead of inorganic ultrafine particles (C), ultrafine silica having an average particle size of 200 to 300 nm was blended by 40% with respect to the total fat components. Prepared a hard coat layer forming material in the same manner as in Example 1. [0150] (Preparation of hard coat film)
- a hard coat film was obtained in the same manner as in Example 1 except that the hard coat layer forming material was used in Example 1.
- Example 1 a hard coat layer forming material was prepared in the same manner as in Example 1 except that the preparation of the hard coat layer forming material did not include inorganic ultrafine particles (C).
- a hard coat film was obtained in the same manner as in Example 1 except that the hard coat layer forming material was used and the thickness of the hard coat layer was changed to 21 ⁇ m.
- Example 1 the preparation of the hard coat layer forming material was carried out in the same manner as in Example 1 except that the compound was not mixed with isocyanuric acid acrylate (B), and instead 20 parts by weight of pentaerythritol tetraacrylate was mixed. A hard coat layer forming material was prepared in the same manner.
- a hard coat film was obtained in the same manner as in Example 1 except that the hard coat layer forming material was used and the thickness of the hard coat layer was changed to 19 m.
- Example 1 in preparing the hard coat layer-forming material, there was no effort to blend isocyanuric acid acrylate (B) and inorganic ultrafine particles (C). Instead, 20 parts by weight of pentaerythritol tetraacrylate was used. A hard coat layer-forming material was prepared in the same manner as in Example 1 except that it was blended.
- Example 1 was the same as Example 1 except that the hard coat layer forming material was used. In this way, a hard coat film was obtained.
- a hard coat film was obtained in the same manner as in Example 1 except that the hard coat layer forming material was used in Example 1.
- the measurement light is incident on the measurement surface of the transparent plastic film substrate and the node coat layer, and the measurement is performed according to the specified measurement method shown in the apparatus. went.
- Measurement was performed with a micro gauge thickness gauge manufactured by Mitutoyo Corporation.
- the thickness of the hard coat film provided with a hard coat layer on a transparent plastic film substrate was measured, and the thickness of the node coat layer was calculated by subtracting the thickness of the substrate.
- MCPD2000 (trade name), an instantaneous multi-side optical system manufactured by Otsuka Electronics Co., Ltd., was used to calculate from the interference spectrum waveform.
- the obtained hard coat film (including the antireflection hard coat film) was evaluated as follows. The results are shown in Table 1.
- the surface of the hard coat film on which the hard coat layer is not formed is attached to a glass plate with an adhesive having a thickness of about 20 m, it is attached to the surface of the hard coat layer (or antireflection layer).
- the test was conducted in accordance with the pencil hardness test described in JIS K-5400.
- the hard coat film was brazed so as to be in direct contact with metal rolls having different diameters with the transparent plastic film substrate inside, and the presence or absence of cracks in the hard coat layer (or antireflection layer) was visually determined.
- the diameter of the cracked force was measured as the value of flexibility.
- the haze was measured using a haze meter HR300 (manufactured by Murakami Color Research Laboratory) according to JIS—K7136 haze (cloudiness).
- ⁇ A change in interference color can be confirmed thinly on the hard coat layer surface, or interference defects are hardly noticeable.
- Interference fringes can be confirmed at intervals of several mm, or interference fringes can be confirmed at intervals of several cm.
- Mitsubishi Rayon black acrylic board (thickness: 2. Omm) is bonded with an adhesive of about 20 m in thickness to eliminate reflection on the back side.
- the reflectance of the hard coat layer (or antireflection layer) surface was measured.
- the reflectance was measured using a UV2400PC (with 8 ° tilt integrating sphere) spectrophotometer manufactured by Shimadzu Corporation, and the spectral reflectance (specular reflectance + diffuse reflectance) was measured.
- the reflectance (Y value) was calculated.
- TAC triacetyl cellulose
- PET polyethylene terephthalate
- DPEA dipentaerythritol hexaacrylate
- the hard coat film and antireflection hard coat film of the present invention are applied to optical elements such as polarizing plates, and these are used for image display devices, particularly CRTs, liquid crystal displays (L
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Abstract
Description
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US10/588,548 US7569269B2 (en) | 2004-10-06 | 2005-09-26 | Hard coat film, antireflection hard coat film, optical element and image display |
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JP2004293935A JP4429862B2 (ja) | 2004-10-06 | 2004-10-06 | ハードコートフィルム、反射防止ハードコートフィルム、光学素子および画像表示装置 |
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KR (1) | KR100816700B1 (ja) |
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JP4429862B2 (ja) | 2010-03-10 |
JP2006106427A (ja) | 2006-04-20 |
US20070178297A1 (en) | 2007-08-02 |
TWI298728B (ja) | 2008-07-11 |
CN100469821C (zh) | 2009-03-18 |
KR20060071407A (ko) | 2006-06-26 |
CN1906235A (zh) | 2007-01-31 |
US7569269B2 (en) | 2009-08-04 |
TW200628523A (en) | 2006-08-16 |
KR100816700B1 (ko) | 2008-03-27 |
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