WO2003026881A1 - Hard coat film, base on which hard coat film is formed, image display having them - Google Patents

Hard coat film, base on which hard coat film is formed, image display having them Download PDF

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Publication number
WO2003026881A1
WO2003026881A1 PCT/JP2002/004364 JP0204364W WO03026881A1 WO 2003026881 A1 WO2003026881 A1 WO 2003026881A1 JP 0204364 W JP0204364 W JP 0204364W WO 03026881 A1 WO03026881 A1 WO 03026881A1
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WO
WIPO (PCT)
Prior art keywords
hard coat
film
layer
coat film
coat layer
Prior art date
Application number
PCT/JP2002/004364
Other languages
French (fr)
Japanese (ja)
Inventor
Akihiro Matsufuji
Yuuzou Muramatsu
Seiya Sakurai
Kenichiro Hatayama
Original Assignee
Fuji Photo Film Co., Ltd.
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Application filed by Fuji Photo Film Co., Ltd. filed Critical Fuji Photo Film Co., Ltd.
Priority to JP2003530497A priority Critical patent/JPWO2003026881A1/en
Priority to KR1020047003621A priority patent/KR100905683B1/en
Publication of WO2003026881A1 publication Critical patent/WO2003026881A1/en

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10Optical coatings produced by application to, or surface treatment of, optical elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02Physical, chemical or physicochemical properties
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14Protective coatings, e.g. hard coatings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/40Properties of the layers or laminate having particular optical properties
    • B32B2307/416Reflective
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/50Properties of the layers or laminate having particular mechanical properties
    • B32B2307/51Elastic
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00Electrical equipment
    • B32B2457/20Displays, e.g. liquid crystal displays, plasma displays

Definitions

  • Hard coat film base material laminated with hard coat film, and image display device provided with these
  • the present invention provides a hard coat film having excellent scratch resistance and surface hardness, an anti-reflection layer, an ultraviolet / infrared absorption layer, a selective wavelength absorption layer, an antistatic layer, an electromagnetic wave shielding layer, and a hard coat film.
  • the present invention relates to a hard coat film with a functional thin film provided with a functional thin film such as an antiglare layer and an antifouling layer. Further, the present invention relates to a base material on which a hard coat film is laminated. Further, the present invention relates to an image display device provided with a hard coat film or a substrate on which the hard coat film is laminated.
  • Conventional hard coat films are usually prepared by coating an active energy ray-polymerizable resin such as a thermosetting resin or an ultraviolet-curing resin directly on a plastic substrate film or through a primer layer of about 1 zm or less. It is manufactured by forming a thin coating of about 15 1m.
  • an active energy ray-polymerizable resin such as a thermosetting resin or an ultraviolet-curing resin directly on a plastic substrate film or through a primer layer of about 1 zm or less. It is manufactured by forming a thin coating of about 15 1m.
  • the resin-forming component of the layer is a polyfunctional acrylate monomer, which contains a powdery inorganic filler such as alumina, silica, titanium oxide, and a polymerization initiator.
  • a coating composition is disclosed in Patent No. 1,815,116.
  • a photopolymerizable composition containing an inorganic filler made of silica or alumina surface-treated with an alkoxysilane or the like is disclosed in Japanese Patent No. 1416240.
  • filling with crosslinked organic fine particles has recently been studied.
  • Japanese Patent Application Laid-Open No. 2000-520472 proposes a method of satisfying curl and scratch resistance by forming a two-layer hard coat layer and adding fine particle silica to the first layer. ing.
  • Japanese Patent Application Laid-Open No. 2000-71392 discloses a hard coat layer having a two-layer structure, a lower layer using a cured resin layer composed of a blend of a radical-curable resin and a cation-curable resin, and an upper layer. Describes a hard coat film using a cured resin layer composed of only a radical curable resin. However, these were also not sufficiently hard.
  • Japanese Patent Laid-Open Publication No. 2000-15734 discloses that the cured resin film layer has a specific elastic modulus to achieve pencil hardness. It was difficult to do this. Disclosure of the invention
  • the first problem to be solved by the present invention is to provide a hard coat film using a base film such as a PET film, having a pencil hardness of 4 H or more and having a large surface hardness and improved curl and brittleness.
  • Another object of the present invention is to provide a hard coat film with a functional thin film having functions such as antireflection, antiglare, and antifouling.
  • a second problem to be solved by the present invention is to provide a substrate on which a hard coat film is laminated.
  • a third problem to be solved by the present invention is to provide an image display device provided with a hard coat film or a base material on which a hard coat film is laminated.
  • a substrate on which the hard coat film is laminated A substrate on which the hard coat film is laminated.
  • the surface elastic modulus in the present invention is a value obtained by using a micro surface hardness tester (Fisher's Instruments, Inc .: Fisher scope H100VP-HCU). Specifically, use a diamond pyramid indenter (tip-to-face angle: 1 36 °) and adjust the indentation depth under an appropriate test load within the indentation depth not exceeding 1 im. It is an elastic modulus that is measured and obtained from changes in load and displacement when the load is removed. BEST MODE FOR CARRYING OUT THE INVENTION
  • a plastic film is preferable, and polyester such as polyethylene terephthalate and polyethylene naphthate, and cellulose such as poly-carbonate, carbonate, triacetyl cellulose and diacetyl cellulose.
  • polystyrene such as polypropylene, polyethylene, polymethylpentene, and syndiotactic polystyrene, norbornene-based resins such as cyclic olefins (eg, Zeonor, Zeonex, and Oneton manufactured by Zeon Corporation, JSR Corporation) Etc.)
  • films of polysulfone, polyether sulfone, polyarylate, polyether imide, polymethyl methacrylate and polyether ketone are preferred.
  • the thickness of the film is preferably from 20 to 500 / m.
  • the substrate film is preferably transparent, and the light transmittance of the transparent substrate film is 400 ⁇ ! It is preferably at least 80%, more preferably at least 90%, in the wavelength range of up to 780 nm. It is of course possible to apply the hard coat layer of the present invention to a sheet-like or panel-like substrate other than a film, preferably to a transparent substrate.
  • the rigidity of the hard coat layer is proportional to the flexural rigidity, which is related to the elastic modulus and film thickness.
  • the bending stiffness of the hard coat layer is low, the node coat layer itself is easily deformed, and the load of the pencil test is applied to the base film, and the base film is deformed.
  • the bending stiffness of the hard coat layer By increasing the bending stiffness of the hard coat layer, deformation due to the load in the pencil test is reduced, and deformation of the base film can be suppressed. It is preferable to increase the bending stiffness, but it is necessary that the substrate film has a certain bending stiffness or less for handling by rolls.
  • Cube of the product of the surface elastic modulus and the hard coat layer thickness of the hard coat layer is preferably from 3 0 KP a 'mm 3 ⁇ 7 0 0 KP a ⁇ mm 3, 1 0 OKP a ⁇ mm 3 ⁇ 4 0 OKP a • mm 3 is particularly preferred.
  • the hard coat layer The surface elastic modulus of the hard coat layer is preferably at least 4. OGPa, and more preferably at least 4.5 GPa. With a hard coat layer having a surface elastic modulus of less than 4. OGPa, sufficient pencil hardness and scratch resistance may not be obtained.
  • the surface elastic modulus is preferably 9. OGPa or less, more preferably 7. OGPa or less.
  • the surface elastic modulus of the hard coat layer is preferably from 4. OGPa to 9. OGPa, and more preferably from 4.5 GPa to 7.0 GPa.
  • the surface elastic modulus of the hard coat layer is adjusted by changing the cross-linking density by selecting a polyfunctional monomer used for the curable composition that is cured by heat or active energy rays, or by adding a polymer containing a polymerizable group. can do. It can also be adjusted by adding inorganic fine particles of a metal oxide such as silica, alumina or titania or organic fine particles such as a crosslinked polymer to the hard coat layer.
  • the thickness of the hard coat layer of the present invention is preferably at least 10 / m, more preferably at least 20 m. When the thickness is increased, the pencil hardness is improved, but it is difficult to bend the film, and cracking due to bending is more likely to occur. Therefore, the thickness is preferably 60 m or less, more preferably 5 Ozm or less. It is more preferably from 10 to 6 Om, particularly preferably from 20 to 60 m, most preferably from 20 to 50 zm.
  • the hard coat layer is composed of at least one layer, and may be in a form of two or more layers.
  • the hard coat layer be rounded with the outer side being rounded, so as to reduce the crackability of the hard coat represented by the diameter of the winding when cracks occur in the hard coat layer.
  • the crackability of the hard coat layer of the present invention is preferably 150 mm or less, and more preferably 8 Omm or less.
  • C Curable compositions include thermosetting compositions and active energy ray polymerizable compositions. It is possible to use a cross-linking reaction of prepolymers such as melamine resin, urethane resin, epoxy resin, etc., which is based on the sol-gel reaction of silicate, but the active energy ray is difficult to control the reaction. Polymerizable resin is preferred Commonly used.
  • the hard coat layer in the present invention is preferably a layer mainly composed of a curable composition hardened by irradiation with active energy rays.
  • a layer mainly composed of a curable composition cured by irradiation with active energy rays means, in addition to the curable composition by active energy rays, inorganic or organic fine particles described later, It means that an initiator and other additives may be contained.
  • curable compositions containing compounds having a polyfunctional polymerizable group or a bridging group that react by irradiation with active energy rays are subject to volume shrinkage during curing, and the curl increases as the film thickness increases. have.
  • the shrinkage at the time of hardening is small.
  • the volume shrinkage before and after curing at 25 ° C. is 0 to 15%, preferably 0 to 13%, and more preferably 0 to 11%.
  • the volume shrinkage due to curing can be determined from the change in density of the curable composition before and after curing.
  • MULTI VOLUME PYC manufactured by Micrometrics Inc.
  • the value of the curl value with respect to the thickness of the hard coat that is,
  • the value (absolute value) divided by the film thickness (jm) of the substrate be smaller, and the value be 0.45 (1 / (m ⁇ ⁇ -)) or less, more preferably 0 ⁇ 35 (1 / (m -jum)) It is preferred that:
  • the force value is a value obtained by the following formula B.
  • the volume of the hard coat layer may expand and contract depending on the amount of moisture absorption. twenty five
  • the absolute value of the difference between the curl value at 10% RH at 25 ° C and 80% RH at 25 ° C is 24 or less.
  • the curability of the curable composition after curing by irradiation with active energy rays is small, and the I / O value of the curable composition after curing related to hydrophilicity is 0. It is preferably from 1 to 0.85. More preferably, it is 0.25 to 0.8, most preferably 0.35 to 0.75.
  • the I / O value exceeds 0.85, the polymer produced by curing becomes more hydrophilic, and the volume expansion and hardness of the hard coat layer are greatly affected by humidity, and the high surface hardness is maintained. However, it tends to be difficult to obtain a hard coat film having good curl characteristics. If the I / O value is too small, the moisture expansion may be small and the curl at normal humidity may be large.
  • I / O values are described in Atsushi Fujita, "Systematic Organic Qualitative Analysis, Pure Products” (Kazama Publishing, 1970), Yoshio Koda, “Organic Conceptual Diagram” (Sankyo Publishing, 1984), etc. It is the “inorganic (I) / organic (0)” value obtained by the method. I / O values are used as a means to predict various physicochemical properties of organic compounds. Organic can be compared by comparing the number of carbon atoms, and inorganic can be compared by comparing the boiling points of hydrocarbons with the same number of carbons.
  • one (one CH 2 —) (actually C) is determined to have an organic value of 20, and the inorganic value is determined to be 100 due to the effect of the hydroxyl group (-OH) on the boiling point. is there.
  • the values of other substituents (inorganic groups) obtained based on the inorganic value of (-OH) of 100 are shown in the “Inorganic Group Table”.
  • the ratio of the above-mentioned inorganic value and organic value in the composition after irradiating the curable composition forming the hard coat layer with active energy rays and curing was used as the I / O value.
  • the I / O value of the curable composition cured by irradiation with active energy rays is calculated as the I / O value of each repeating unit of the polymer formed by irradiation with active energy rays, and the mass fraction of each repeating unit. Multiplied by the rate, the total value.
  • the I / O value of the curable composition hardened by irradiation with active energy rays can be adjusted to 0.1 to 0.85 by appropriately setting the composition of the curable composition before curing. is there.
  • the I / O value can be controlled to 0.1 to 0.85 by reducing the groups such as —OH, —COOR, —NH 2 , and —CO— in the cured composition.
  • the amount of moisture absorption can be reduced.
  • Moisture absorption of the hard coat layer of the present invention at 25 ° C and 60% RH The amount is preferably 3% by mass or less, more preferably 2.5% by mass or less, most preferably 2% by mass or less based on the hard coat layer at the time of drying.
  • the active energy ray polymerizable resin layer preferably used as the hard coat layer of the present invention contains a polyfunctional monomer and / or an oligomer, a polymer having a polymerizable functional group or a crosslinkable reactive group in a side chain, and a polymerization initiator. It can be formed by applying a coating liquid on the above-mentioned base film and polymerizing a polyfunctional monomer, oligomer or polymer.
  • a radical polymerizable unsaturated double bond group / open-opening polymerizable cyclic ether group is preferable.
  • Examples of the polymerizable unsaturated double bond group include an acryloyl group, a methyl acryloyl group, a vinyl group and an aryl group. From the viewpoint of reactivity, an acryloyl group and a methyl acryloyl group are preferably used.
  • a monomer having a polyfunctional polymerizable unsaturated double bond group examples include glycol-based (meth) acrylates such as ethylene glycol di (meth) acrylate and ethylene glycol di (meth) acrylate, and n— Hexanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, ditrimethylolpropanetri (meth) acrylate, ditrimethylolpropanetetra (meth) acrylate, pentaerythritol tri (meth) acrylate, pen Erythritol tetra (meth) acrylate, dipentyl erythritol pentyl (meth) acrylate, dipentyl erythritol hexyl (meth) acrylate, 1,4-cyclohexanedioldi (meth) acrylate, 1,3 , 5 —cyclohexanetrio
  • a polyisocyanate polyurethane oligomer composed of a condensation product of polyepoxyacrylates and polyisocyanate with a polyol and a hydroxyl group-containing acrylate such as hydroxyethyl (meth) acrylate. Obtained urethane evening Nakuri Rates and the like can be mentioned.
  • Examples of the ring-opening polymerizable cyclic ether compound include epoxy derivatives, oxetane derivatives, tetrahydrofuran derivatives, and cyclic imino ethers such as oxazoline derivatives.Epoxy derivatives, oxetane derivatives, and oxazoline derivatives are particularly preferable. .
  • ring-opening polymerizable cyclic ether compounds are preferably compounds having two or more, preferably three or more, of the above-mentioned cyclic structures in the same molecule.
  • trifunctional glycidyl ethers such as trimethylolethane triglycidyl ether, trimethylolpropane triglycidyl ether, glycerol triglycidyl ether, triglycidyl trishydroxyethyl isocyanurate, etc.
  • Epoxides with three or more functionalities are epoxy resin GT-301, such as sorbitol tetraglycidyl ether, pen erythritol tetraglycyl ether, polyglycidyl ether of cresol novolak resin, and polyglycidyl ether of phenol novolak resin.
  • a monofunctional monomer can be added to the polyfunctional monomer to adjust the surface elasticity, reduce curing shrinkage, and improve adhesion.
  • Monofunctional monomers alkyl esters of acrylic acid such as methyl (meth) acrylate and butyl (meth) acrylate; hydroxyethyl (meth) acrylate; dimethylaminoethyl (meth) acrylate; glycidyl (meth) acrylate
  • Acrylic esters containing polar groups such as acrylamides such as (meth) acrylamide, N-methylol (meth) acrylamide, and existing monomers such as N-vinylpyrrolidone, styrene, vinyl acetate, and maleic anhydride.
  • compounds having one or two ring-polymerizable groups in the same molecule can be used in combination, if necessary.
  • Preferred compounds are monofunctional or bifunctional glycidyl ethers, monofunctional or bifunctional glycidyl ethers.
  • Functional epoxies, monofunctional or two-functional Oxetanes, and various commercially available or known compounds can be used.
  • an oligomer or polymer containing at least two or more radically polymerizable groups to a polyfunctional monomer.
  • the oligomer or polymer containing a radical polymerizable group include oligomers and polymers having a polymerizable group such as a (meth) acryloyl group or an aryl group in a pendant group. Examples thereof include an oligomer having a hydroxyl group and a polymer having a hydroxyl group.
  • examples include epoxy ring polymer such as glycidyl (meth) acrylate, a polymer, an oligomer having a quenched acetyl group, and a polymer into which an acryloyl group is introduced by a dehydrochlorination reaction of a polymer.
  • the compound having three or more ring-opening polymerizable groups in the same molecule contains a crosslinkable polymer containing a repeating unit represented by the formula (1).
  • R 1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and is preferably a hydrogen atom or a methyl group.
  • L 1 is a single bond or a divalent linking group, preferably a single bond, a 10—, an alkylene group, an arylene group, and a * 0-CO *, * _CONH—, * — linked to the main chain on the * side. OCO— ⁇ * —NHCO—.
  • P 1 is a monovalent group containing a ⁇ polymerizable group, preferred P 1, epoxy ⁇ , Okisetan ring, a tetrahydrofuran ring, a lactone ring, the force - Boneto ring one, including Iminoeteru rings such Okisazorin ⁇ And a monovalent group containing an epoxy ring, an oxetane ring, or an oxazoline group.
  • the crosslinkable polymer of the present invention containing a repeating unit represented by the formula (1) is preferably synthesized simply by polymerizing a corresponding monomer.
  • radical polymerization is the simplest and preferable. Specific examples include polyglycidyl methacrylate, polymethyl glycidyl methacrylate, polyepoxycyclohexylmethyl methacrylate, and poly (3-ethyl) -3-oxenyl dimethylmethyl methacrylate. Rates and the like.
  • R 1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms
  • P 1 is a monovalent group containing a cyclic polymerizable group
  • L 1 is a single bond or a divalent linking group. is there.
  • the polyfunctional polymerizable unsaturated double bond group-containing monomer or polymer or polymer and the polyfunctional cyclic structure-containing compound may be used in combination.
  • a polyfunctional polymerizable unsaturated double bond When adding a monofunctional monomer, an oligomer containing at least two or more polymerizable unsaturated double bond groups or a polymer or a ring-opening polymerizable cyclic ether compound, a polyfunctional polymerizable unsaturated double bond
  • the amount added to the bond-containing monomer is preferably 50% by mass or less, more preferably 35% by mass or less. If the proportion of monofunctional monomers, oligomers or polymers containing at least two or more polymerizable unsaturated double bond groups or ring-opening polymerizable cyclic ether compounds becomes too large, the desired hardness cannot be obtained. .
  • Inorganic or organic fine particles are added to these active energy ray polymerizable resin layers to adjust the surface elastic modulus of the hard coat layer or reduce the curing shrinkage to reduce the force of the hard coat film. can do.
  • the fine particles include inorganic oxides and internally crosslinked polymer resin particles.
  • the inorganic oxide particles those having a high hardness are preferable, and inorganic oxide particles having a Mohs hardness of 6 or more are preferable.
  • Examples include silicon dioxide particles, titanium dioxide particles, zirconium oxide particles, aluminum oxide particles, and the like.
  • organic fine particles examples include resin particles such as acrylic resin, polystyrene, polysiloxane, melamine resin, benzoguanamine resin, polytetrafluoroethylene, cellulose acetate, polycarbonate, nylon, and the like. Particles composed of methyl acrylate (divinylbenzene copolymer), polysiloxane, polystyrene, melamine resin, benzoguanamine resin, and a complex thereof are preferred. Further, internally crosslinked polymer resin fine particles obtained by copolymerization with a monomer having a bifunctional or higher functional group are preferred.
  • the volume average particle diameter of these fine particles is 1 nm or more and 400 nm or less, more preferably 5 nm or more and 200 nm or less, and still more preferably 10 nm or more and 100 nm or less. At lnm or less, dispersion is difficult and aggregated particles are formed. At more than 400nm, the haze increases, and both are unfavorable because transparency is reduced.
  • the addition amount of these fine particles is more preferably from 5 to 80% by mass, and even more preferably from 10 to 50% by mass, based on the total amount of the active energy ray-polymerizable resin layer.
  • inorganic fine particles have a poor affinity for the active energy ray-polymerizable resin, so that the interface is easily broken by simply mixing the two, the film is easily broken, and it is difficult to improve the scratch resistance.
  • the surface of the inorganic fine particles can be treated with a surface modifier containing an organic segment.
  • the surface modifier preferably forms a bond with the inorganic fine particles on the one hand, and has a high affinity with the active energy linear polymerizable resin on the other hand.
  • Examples of the compound capable of forming a bond with the surface of the inorganic fine particles include metal alkoxide compounds such as silicon, aluminum, titanium, and zirconium, phosphate esters, phosphonate groups, sulfate esters, sulfonic acid groups, and carboxylic acid groups.
  • An anionic compound having the same is preferred.
  • a polymerizable unsaturated double bond group or a ring-opening polymerizable compound may be added to the terminal of the metal alkoxide compound or anionic compound. It preferably has a cyclic ether group.
  • the heat resistance of the plastic film itself is low. Therefore, when the curable resin is hardened by heating, it is preferable to cure at a temperature as low as possible.
  • the heating temperature in that case is 140. C or lower, more preferably 100 ° C. or lower.
  • hardening by the action of light is often used because the crosslinking reaction often proceeds at a low temperature.
  • examples of the active energy ray include radiation, gamma ray, alpha ray, electron beam, and ultraviolet ray. Particularly preferred is a method of adding a polymerization initiator for generating the above, followed by curing with ultraviolet rays. In addition, by heating after irradiating with ultraviolet rays, it may be possible to further promote the stiffening.
  • the preferable heating temperature in this case is 140 ° C. or less.
  • Examples of the photoradical polymerization initiator include acetophenones, benzophenones, Michler's ketone, benzoylbenzoate, benzoins, hyacyloxime ester, tetramethylthiuram monosulfide, and thioxanthone.
  • a photosensitizer may be used in addition to the photopolymerization initiator. Examples of photosensitizers include n-butylamine, triethylamine, triethanolamine, tri-n-butylphosphine, thioxanthone, and the like.
  • photoacid generators that generate cations include compounds such as triarylsulfonium salts, diaryliodonium salts, and nitrobenzyl esters of sulfonic acids.
  • Various known photoacid generators such as the compounds described in "Materials" published by Bunshin Publishing Co., Ltd. (1997) can be used.
  • a sulfonium salt such as diphenyl 4-thiophenoxyphenylsulfonium hexafluoroantimonate or diphenyldonium salt, and a counter ion As PF 6- , S b F 6 _, A s F 6 —, B (C 6 F 5 ) 4 — and the like are preferred.
  • polymerization initiator is preferably used in the range of 0.1 to 15 parts by mass, more preferably in the range of 1 to 10 parts by mass, based on 100 parts by mass of the polyfunctional monomer. preferable.
  • the coating solution of the active energy ray polymerizable resin may be mixed with an organic solvent such as ketones such as methyl ethyl ketone and methyl isobutyl ketone, alcohols such as ethyl alcohol and isopropyl alcohol, esters such as ethyl acetate, and the above polyfunctional monomer. It is prepared by dissolving a nomer and a polymerization initiator mainly. In order to omit the drying step, it is possible to use a non-solvent.
  • an organic solvent such as ketones such as methyl ethyl ketone and methyl isobutyl ketone, alcohols such as ethyl alcohol and isopropyl alcohol, esters such as ethyl acetate, and the above polyfunctional monomer. It is prepared by dissolving a nomer and a polymerization initiator mainly. In order to omit the drying step, it is possible to use a non-solvent.
  • the hard coat film of the present invention is obtained by coating an active energy ray polymerizable resin paint on a base film by a dipping method, a spinner method, a spray method, a roll coat method, a gravure method, a wire bar method, or an extruder method. It can be formed by a known thin film forming method such as a blade method, a die coating method, and the like, dried, and irradiated with active energy rays.
  • one or both surfaces can be subjected to a surface treatment by an oxidation method, a roughening method, or the like, if desired.
  • the oxidation method include a corona discharge treatment, a glow discharge treatment, a plasma treatment, a chromic acid treatment (wet method), a flame treatment, a hot air treatment, and an ozone irradiation with ultraviolet rays.
  • one or more undercoat layers can be provided.
  • Examples of the material for the undercoat layer include copolymers or latexes such as vinyl chloride vinyl chloride, vinylidene chloride, butadiene, (meth) acrylate and vinyl ester, and water-soluble polymers such as low molecular weight polyester and gelatin.
  • copolymers or latexes such as vinyl chloride vinyl chloride, vinylidene chloride, butadiene, (meth) acrylate and vinyl ester
  • water-soluble polymers such as low molecular weight polyester and gelatin.
  • Metal oxides such as tin oxide, ITO and zinc oxide and ionic organic compounds can be added to the undercoat layer as a conductive substance.
  • the hard coat layer may be a single layer, but may be composed of two or more layers. Many The layered structure may be formed by sequentially laminating layers having different surface elastic moduli. In the case of a multi-layer structure, the elastic modulus, cure shrinkage, IZO value, and moisture absorption of each layer can be obtained as values obtained by correcting the characteristics of each layer with the thickness.
  • a functional thin film such as an antireflection layer, an antiglare layer, and an antifouling layer can be provided on the hard coat layer. Furthermore, it is also possible to laminate and combine an ultraviolet or infrared absorption layer, a selective wavelength absorption layer, an antistatic layer, and an electromagnetic wave shielding layer, and it is provided as a hard coat film with a highly functional thin film.
  • These functional thin films can be formed by a wet method of applying a solution of a known functional material, or a dry method of forming a vacuum film such as a sputter or vapor deposition.
  • FIG. 1 is a schematic diagram showing the layer structure of a hard coat film as one embodiment of the present invention
  • FIG. 2 is a layer structure of a hard coat film with a functional thin film as one embodiment of the present invention.
  • 1 is a substrate film
  • 2 is a hard coat layer
  • 3a is a high refractive index layer
  • 3b is a low refractive index layer
  • 4 is an antistatic undercoat layer.
  • a substrate on which these hard coat films are laminated is preferably used as a substrate having excellent scratch resistance and surface hardness.
  • a base material include a plastic sheet to which a hard coat film is attached to prevent surface damage, and a show window or window glass to which a hard coat film is attached to prevent scattering. And the like.
  • the hard coat film can be laminated with an adhesive and attached to a substrate.
  • the hard coat film may be attached to only one side of the substrate, or may be attached to both sides of the substrate.
  • Glass or plastic can be used as a substrate on which the hard coat film is laminated.
  • the plastic include cellulose esters, polyamides, polycarbonates, polyesters, polystyrenes, polyolefins, polysulfones, polyestersulfones, polyarylates, polyetherimides, polymethylmethacrylates and polyetherketones.
  • the substrate is preferably transparent, and the light transmittance of the substrate is 400 ⁇ ! It is preferably at least 80%, more preferably at least 90% in a wavelength range of up to 780 m. New
  • the thickness of the substrate is preferably 1 to 30 mm, and the substrate may be in any shape such as a sheet shape, a panel shape, and a plate shape.
  • the image display device provided with the hard coat film of the present invention or the substrate on which the laminated film is provided has excellent abrasion resistance, and is preferably used as an image display device having surface hardness.
  • the image display devices provided include flat panel displays (FPDs) such as liquid crystal displays (LCDs), plasma display panels (PDPs), field emission displays (FEDs), electroluminescence displays (ELDs), and cathode ray tube displays. (CRT), touch panels, and the like.
  • FPDs flat panel displays
  • LCDs liquid crystal displays
  • PDPs plasma display panels
  • FEDs field emission displays
  • ELDs electroluminescence displays
  • CTR cathode ray tube displays.
  • FIG. 3 is a schematic view showing a cross section of an image display device provided with a hard coat film as one embodiment of the present invention
  • FIG. 4 is a hard disk as one embodiment of the present invention
  • FIG. 3 is a schematic view showing a cross section of an image display device provided with a base material on which a tofilm is laminated. 3 or 4,
  • A indicates an image display device
  • B indicates a substrate
  • C indicates a hard coat film or a hard coat film with a functional thin film.
  • the product of the surface elastic modulus of the hard coat layer and the cube of the thickness is 3 OKP a-mm 3 or more 70
  • FIG. 1 is a schematic view showing the layer constitution of one embodiment of the hard coat film of the present invention.
  • FIG. 2 is a schematic diagram showing a layer configuration of one embodiment of the hard coat film with a functional thin film of the present invention.
  • FIG. 3 is a schematic view showing a cross section of an image display device provided with a hard coat film or a hard coat film with a functional thin film of the present invention.
  • FIG. 4 is a schematic view showing a cross section of an image display device provided with a substrate on which a hard coat film or a hard coat film with a functional thin film of the present invention is laminated.
  • the curable resin described in Table 1 was dissolved in methyl ethyl ketone (MEK), a polymerization initiator was added, and the mixture was filtered through a polypropylene filter having a pore size of 1 zm to prepare a curable yarn.
  • MEK methyl ethyl ketone
  • Latex made of styrene butadiene copolymer having a glass transition temperature of 37 ° C (LX407C5; manufactured by Nippon Zeon Co., Ltd.) previously treated with corona and a tin oxide-acid-antimony complex oxide (FS-10D; Ishihara (Manufactured by Co., Ltd.) in a ratio of 5: 5 by mass, and applied so that the film thickness after drying becomes 0.2 m, so that the antistatic undercoat layer is formed to a thickness of 175 mm.
  • a PET film (biaxially stretched polyester terephthalate film) and an 80 zm triacetyl cellulose film were separately manufactured.
  • the dangling composition was applied on the two antistatic films by an extrusion method so as to have a predetermined thickness (the thickness was determined by the dissolution concentration of the curable composition and the coating amount). Adjusted with.) After drying the curable composition at 100 ° C, irradiate ultraviolet rays with illuminance of 75 OmJ / cm 2 to form a hard coat film with a hard coat layer (samples with t added to triacetyl cellulose) was created.
  • irgacure 184 manufactured by Ciba Geigy Co., Ltd.
  • liposome dosyl 2074 manufactured by Rhodia
  • the calorie content was 4% by mass based on the curable resin.
  • the alumina dispersion ** is 234 parts of methyl isobutyl ketone, A mixture of 36 parts of M-530 (methacrylate containing a carboxylic acid group; manufactured by Toagosei Co., Ltd.) and 180 parts of fine-particle alumina (AKP-GO15; manufactured by Sumitomo Chemical Co., Ltd.)
  • M-530 methacrylate containing a carboxylic acid group
  • a mixture of fine-particle alumina (AKP-GO15; manufactured by Sumitomo Chemical Co., Ltd.)
  • This is a dispersion of alumina fine particles that has been surface-treated by dispersing with a ceramic-coated sand mill using zirconium aviation of 1 ⁇ as the medium.
  • the mass in the table is the mass of the solid component.
  • Table 1 shows the pencil hardness, curl value, cracking property, etc. of the hard coat film.
  • a hard coat material having a small curl can be obtained by using a hard coat material having a volume shrinkage of 15% or less after curing.
  • the surface elastic modulus of the hard coat layer is 9 GPa or more, the brittleness is remarkably deteriorated even if the curing shrinkage is small, and the hard coat layer may be easily broken.
  • the product of the cube of the surface elastic modulus and the thickness of the prepared hard coat layer, the surface elastic modulus, the thickness, the cure shrinkage of the cured composition, the I / O value, and the hard coat film when PET is used as the base film Table 2 shows the pencil hardness, curl value, cracking property, and the like.
  • the product of the surface elastic modulus and the cube of the film thickness is large, and the volume shrinkage of the curable composition after curing is 15% by volume or less and the I / O value is 0.85 or less.
  • Titanium dioxide fine particles (TTO-55B, manufactured by Ishihara Sangyo Co., Ltd.) 30.0 parts by mass, anionic monomer (M-5300, manufactured by Toagosei Co., Ltd.) 4.5 parts by mass and cyclohexanone 65.2 mass
  • the parts were dispersed by a sand grinder mill to prepare a titanium dioxide dispersion having a mass average diameter of 55 nm.
  • the titanium dioxide dispersion and dipentyl erythritol hexaacrylate (DPHA, manufactured by Nippon Kayaku Co., Ltd.), a photopolymerization initiator (Irgacure 907, manufactured by Ciba Geigy Co., Ltd.), a photosensitizer (Kayacure-DETX, Nippon Kagaku)
  • the total volume of monomers (total amount of dipentyl erythritol hexylacrylate and anionic monomer) and titanium dioxide is 60/40
  • the photopolymerization initiator and photosensitizer To the methyl ethyl ketone so that the mass ratio with the sensitizer is 3/1, and the mass ratio of the total amount of the photopolymerization initiator and the photosensitizer to the total amount of the monomers is 6/100
  • the mixture was mixed to prepare a high refractive index layer coating solution.
  • the refractive index was 1.80.
  • the coating liquid of the high refractive index layer (a-1) was applied to the hard coat film of Example 43 using a bar so as to have a dry film thickness of 9 Onm, dried, and irradiated with ultraviolet rays.
  • the low-refractive-index layer coating solution of (a-2) is dried on the high-refractive-index layer to a thickness of 85 nm.
  • a hard coat film with an antifouling antireflection layer having an antireflection layer formed by applying, drying, and irradiating ultraviolet rays was obtained.
  • Table 4 shows that the image display device provided with the hard coat film of the present invention has a large surface hardness, is hardly damaged, and has excellent image visibility.
  • Hardening shrinkage rate of hardening composition According to the method already described.
  • Pencil hardness test The hardness of the pencil pull test is 25 for the prepared hard coat film. After conditioning for 5 hours under the condition of 60% relative humidity, using a test pencil specified by JIS S 6006, in accordance with the pencil hardness evaluation method specified by JISK 5400, the scratches and dents were formed under a load of 9.8 N. This is a pencil hardness value that is not recognized.
  • Mechanical pencil drawing After conditioning the film for 5 hours at a temperature of 25 ° C and a relative humidity of 60%, use a HE I DON surface tester N-14 (manufactured by Shinto Kagaku Co., Ltd.). The tip of a metal tip of a mechanical pencil (PD 355, manufactured by Bentel) was rubbed while varying the load, and the load when scratches were generated was examined.
  • Curl value It is a value measured using the curl measurement template of method A of "Method for measuring curl of photographic film" in JIS K7619-1988.
  • the test condition for 60% curl is 25 ° relative humidity 60%.
  • curl is positive,
  • the curl where the coated side of the hard coat layer of LUM is inside the curve is defined as negative, and the curl where the coated side is outside the curve is defined as negative.
  • the larger the value the more the curl is significant.
  • Curl humidity difference The curl values were read at 80% and 10% relative humidity at 25 ° C and expressed as the absolute value of the difference between the two values.
  • Moisture absorption After drying for 2 hours in a dry atmosphere at a dew point of 40 ° C, the sample was left at 60 ° C at 25 ° C for 3 hours, and the moisture absorption was determined from the weight change before and after the storage.
  • Eraser rubbing The surface was reciprocated 50 times with a load of lkg using an eraser No. 50 manufactured by Lion Corporation, and the surface damage was visually evaluated. If no scratching or change was observed, it was marked as ⁇ .
  • a quick-drying oil-based ink (Zebra, “Maduki” (registered trademark)) written on the film surface was rubbed several times with “Toray Shi” (registered trademark) manufactured by Toray Industries, Inc. ( ⁇ indicates a state where the written mark has been completely wiped off, ⁇ indicates a state where a part has not been wiped off, and X indicates a state where most of the trace has been wiped off).
  • Fingerprint wiping property Evaluated the ease with which fingerprints on the surface could be wiped off using Toray Co., Ltd.'s "Treshi-1" (registered trademark). X is the one that can be rubbed with force, ⁇ is the middle one).
  • Scratch resistance The number of times a slight visual scratch occurs when the surface of a hard-coated film is rubbed with a load of 1.96 N / cm 2 using # 1000 steel wool. was observed.

Abstract

A hard coat film which is excellent in abrasion resistance and surface hardness and the curling and brittleness of which are improved, a base on which hard coat film is formed, and an image display having them are disclosed. The hard coat film having a hard coat layer on at least one side of its base film is characterized in that the product of the surface elastic modulus of the hard coat layer and the cube of the thickness of the hard coat layer lies in the range from 30 KPa·mm3 to 700 KPa·mm3. The surface elastic modulus of the hard coat layer preferably lies in the range from 4.0 to 9.0 GPa. The hard coat layer is preferably made mainly of a cured composition cured by irradiation with an active energy beam, and the volume shrinkage factor after the curing of the cured composition is preferably 0 to 15%.

Description

明 細 書 ハードコートフィルム、 ハードコートフィルムを積層した基材、 及びこれらを設 けた画像表示装置 技術分野  Description Hard coat film, base material laminated with hard coat film, and image display device provided with these
本発明は、 優れた耐擦傷性、 表面硬度を有するハードコートフィルム、 及ぴハ —ドコートフィルム上に反射防止層、 紫外線 ·赤外線吸収層、 選択波長吸収層、 帯電防止層、 電磁波シールド層、 防眩層、 防汚性層などの機能性薄膜を設けた機 能性薄膜付きハードコートフィルムに関する。 また、 本発明は、 ハードコ一トフ イルムを積層した基材に関する。 さらに、 本発明は、 ハードコートフィルム又は これを積層した基材を設けた画像表示装置に関する。 背景技術  The present invention provides a hard coat film having excellent scratch resistance and surface hardness, an anti-reflection layer, an ultraviolet / infrared absorption layer, a selective wavelength absorption layer, an antistatic layer, an electromagnetic wave shielding layer, and a hard coat film. The present invention relates to a hard coat film with a functional thin film provided with a functional thin film such as an antiglare layer and an antifouling layer. Further, the present invention relates to a base material on which a hard coat film is laminated. Further, the present invention relates to an image display device provided with a hard coat film or a substrate on which the hard coat film is laminated. Background art
近年、 プラスチック製品が、 加工性、 軽量化の観点でガラス製品と置き換わり つつあるが、 これらプラスチック製品の表面は傷つきやすいため、 耐擦傷性を付 与する目的でハードコートフィルムを貼合して用いる場合が多い。 また、 従来の ガラス製品に対しても、 飛散防止のためにプラスチックフィルムを貼合する場合 が增えているが、 フィルム表面の硬度不足のため、 その表面にハードコート層を 形成することが広く行われている o  In recent years, plastic products have been replaced by glass products from the viewpoint of processability and weight reduction.However, since the surface of these plastic products is easily damaged, a hard coat film is used for the purpose of imparting scratch resistance. Often. In addition, plastic films are sometimes bonded to conventional glass products to prevent shattering, but due to insufficient hardness of the film surface, it is widely practiced to form a hard coat layer on the surface. O
従来のハードコートフィルムは、 通常、 熱硬化型樹脂、 あるいは紫外線硬化型 樹脂などの活性エネルギー線重合性樹脂をプラスチック基材フィルム上に直接、 或いは 1 zm程度あるいはそれ以下のプライマ一層を介して 3〜 1 5〃m程度の 薄い塗膜を形成して製造している。  Conventional hard coat films are usually prepared by coating an active energy ray-polymerizable resin such as a thermosetting resin or an ultraviolet-curing resin directly on a plastic substrate film or through a primer layer of about 1 zm or less. It is manufactured by forming a thin coating of about 15 1m.
しかしながら、 前記従来のハードコートフィルムは、 そのハードコート層の硬 度が不十分であったこと、 また、 その塗膜厚みが薄いことに起因して、 下地のプ ラスチック基材フィルムが変形した場合に、 それに応じてハードコート層も変形 し、 ハードコートフィルム全体としての硬度が低下してしまうため、 十分に満足 できるものではなかった。 例えば、 プラスチック基材フィルムとして広く利用さ れているポリエチレンテレフ夕レートフィルム上に、 紫外線硬化型塗料を上記の 厚みで塗工したハ一ドコ一トフイルムにおいては、 鉛筆硬度で 2から 3 Hレベル が一般的であり、 ガラスの鉛筆硬度である 9 Hには全く及ばないものである。 ハードコート層の硬度を上げるために、 該層の樹脂形成成分を多官能性ァクリ ル酸エステル系モノマーとし、 これにアルミナ、 シリカ、 酸化チタン等の粉末状 無機充填剤および重合開始剤を含有する被覆用組成物が特許第 1 8 1 5 1 1 6号 に開示されている。 また、 アルコキシシラン等で表面処理したシリカもしくはァ ルミナからなる無機質の充填材料を含む光重合性組成物が特許第 1 4 1 6 2 4 0 号に開示されている。 さらに架橋有機微粒子を充填することも近年検討されてレ、 る。 これらは若干のハードコートフィルムの表面硬度を上げる効果を持っている が、 ヘイズ増加、 脆性劣化の問題も持っており、 これのみでは近年要求されてい るハードコートフイルムの表面硬度性能に十分に応えうるものではなかった。 また、 特開 2 0 0 0 - 5 2 4 7 2号公報にハードコート層を 2層構成とし、 第 一層に微粒子のシリカを添加することで、 カールと耐傷性を満足させる方法が提 案されている。 さらに、 特開 2 0 0 0— 7 1 3 9 2号公報にはハードコート層を 2層構成とし、 下層をラジカル硬化性樹脂とカチォン硬化性樹脂のプレンドから なる硬化樹脂層を使用し、 上層にラジカル硬化性樹脂のみからなる硬化樹脂層を 使用したハードコートフィルムの記載がある。 しかし、 これらも十分満足できる 硬度ではなかった。 However, in the conventional hard coat film, when the hardness of the hard coat layer is insufficient, and when the thickness of the coating film is thin, the plastic base film as an underlayer is deformed. In addition, the hard coat layer is deformed accordingly, and the hardness of the hard coat film as a whole is lowered, and thus it is not sufficiently satisfactory. For example, widely used as plastic substrate film Hard films with UV curable coatings of the above thickness on polyethylene terephthalate film, which has been coated on a polyethylene terephthalate film, generally have a pencil hardness of 2 to 3 H, and a pencil hardness of glass. It is far below 9 H. In order to increase the hardness of the hard coat layer, the resin-forming component of the layer is a polyfunctional acrylate monomer, which contains a powdery inorganic filler such as alumina, silica, titanium oxide, and a polymerization initiator. A coating composition is disclosed in Patent No. 1,815,116. A photopolymerizable composition containing an inorganic filler made of silica or alumina surface-treated with an alkoxysilane or the like is disclosed in Japanese Patent No. 1416240. In addition, filling with crosslinked organic fine particles has recently been studied. These have the effect of slightly increasing the surface hardness of the hard coat film, but also have the problems of increased haze and brittleness, which alone can sufficiently meet the surface hardness performance of hard coat films that has been required in recent years. It wasn't good. Also, Japanese Patent Application Laid-Open No. 2000-520472 proposes a method of satisfying curl and scratch resistance by forming a two-layer hard coat layer and adding fine particle silica to the first layer. ing. Japanese Patent Application Laid-Open No. 2000-71392 discloses a hard coat layer having a two-layer structure, a lower layer using a cured resin layer composed of a blend of a radical-curable resin and a cation-curable resin, and an upper layer. Describes a hard coat film using a cured resin layer composed of only a radical curable resin. However, these were also not sufficiently hard.
一方、 ハードコート層の厚みを通常の 3〃mから 1 0 mよりも厚くすること が硬度増加に有効であることが知られている。 特にハードコート層に無機、 有機 の充填剤を含有した層を厚くすることで、 ハードコートフィルムの硬度をさらに 向上できるが、 厚くすることでヘイズの増加が大きくなり、 ハードコート層の割 れゃ剥がれが生じやすくなると同時に硬化収縮によるハードコートフィルムの力 ールが大きくなるという問題がある。 このため従来の技術では、 実用上使用でき る良好な特性を有するハードコ一トフイルムを得ることは困難であった。  On the other hand, it is known that increasing the thickness of the hard coat layer from the usual 3 m to more than 10 m is effective for increasing the hardness. In particular, by increasing the thickness of the hard coat layer containing an inorganic or organic filler, the hardness of the hard coat film can be further improved. However, increasing the thickness increases the haze and increases the crack of the hard coat layer. At the same time, peeling tends to occur, and at the same time, the force of the hard coat film due to curing shrinkage increases. For this reason, it has been difficult to obtain a hard coat film having good characteristics that can be practically used by the conventional technique.
さらに、 硬化樹脂皮膜層を特定の弾性率にすることで、 鉛筆硬度を実現するこ とが特開 2 0 0 0 - 1 5 7 3 4号公報に記載されているが、 鉛筆硬度を 5 H以上 にすることは困難であった。 発明の開示 Japanese Patent Laid-Open Publication No. 2000-15734 discloses that the cured resin film layer has a specific elastic modulus to achieve pencil hardness. It was difficult to do this. Disclosure of the invention
本発明が解決しょうとする第 1の課題は、 P E Tフィルムなどの基材フィルム を用いた鉛筆硬度が 4 H以上と表面の硬度が大きく、 カールや脆性を改良したハ ードコートフィルムを提供すること、 さらには、 反射防止、 防眩、 防汚等の機能 を有する機能性薄膜付きハードコートフィルムを提供することである。 本発明が 解決しょうとする第 2の課題はハードコートフィルムを積層した基材を提供する ことである。 本発明が解決しょうとする第 3の課題はハードコートフィルム又は これを積層した基材を設けた画像表示装置を提供することである。  The first problem to be solved by the present invention is to provide a hard coat film using a base film such as a PET film, having a pencil hardness of 4 H or more and having a large surface hardness and improved curl and brittleness. Another object of the present invention is to provide a hard coat film with a functional thin film having functions such as antireflection, antiglare, and antifouling. A second problem to be solved by the present invention is to provide a substrate on which a hard coat film is laminated. A third problem to be solved by the present invention is to provide an image display device provided with a hard coat film or a base material on which a hard coat film is laminated.
上記第 1の課題は、 以下の解決手段によって達成できることを見出した。 基材フィルムの少なくとも片面にハ一ドコ一ト層を積層してなるハードコート フィルムであって、 該ハードコート層の表面弾性率とハ一ドコート層厚みの三乗 の積が 3 0 K P a · mm3以上 7 0 O K P a · mm3以下であることを特徴とす るハ一ドコートフイルム。 It has been found that the first problem described above can be achieved by the following solutions. A hard coat film in which a hard coat layer is laminated on at least one surface of a base film, wherein the product of the surface elastic modulus of the hard coat layer and the cube of the thickness of the hard coat layer is 30 KPa · Hard coat film characterized by being not less than mm 3 and not more than 70 OKP a · mm 3 .
また、 上記第 2の課題は以下の解決手段によって達成できることを見出した。 前記ハードコートフィルムを積層した基材。  Further, they have found that the second problem can be achieved by the following means. A substrate on which the hard coat film is laminated.
また、 上記第 3の課題は以下の解決手段によつて達成できることを見出した。 前記ハードコートフィルム又はこれを積層した基材を設けた画像表示装置。 本発明における表面弾性率は微小表面硬度計 ( (株) フィッシャー 'インスヅ ルメンッ製:フィッシャースコープ H 1 0 0 V P— H C U) を用いて求めた値で ある。 具体的には、 ダイヤモンド製の四角錐圧子 (先端対面角度; 1 3 6 ° ) を 使用し、 押し込み深さが 1 imを超えない範囲で、 適当な試験荷重下での押し込 み深さを測定し、 除荷重時の荷重と変位の変化から求められる弾性率である。 発明を実施するための最良の形態  In addition, they have found that the third problem can be achieved by the following means. An image display device provided with the hard coat film or a substrate on which the hard coat film is laminated. The surface elastic modulus in the present invention is a value obtained by using a micro surface hardness tester (Fisher's Instruments, Inc .: Fisher scope H100VP-HCU). Specifically, use a diamond pyramid indenter (tip-to-face angle: 1 36 °) and adjust the indentation depth under an appropriate test load within the indentation depth not exceeding 1 im. It is an elastic modulus that is measured and obtained from changes in load and displacement when the load is removed. BEST MODE FOR CARRYING OUT THE INVENTION
以下、 本発明の実施の形態を詳しく説明する。 本発明のハードコートフィルム に用いられる基材フィルムとしては、 プラスチックフィルムが好ましく、 ポリエ チレンテレフ夕レート、 ポリエチレンナフ夕レートなどのポリエステル、 ポリ力 —ボネート、 トリァセチルセルロース、 ジァセチルセルロースなどのセルロース 樹脂、 ポリオレフイン (ポリプロピレン、 ポリエチレン、 ポリメチルペンテン、 シンジオタクチヅクポリスチレンなどのポリスチレン、 環状ォレフィンのノルボ ルネン系樹脂 (例えば、 日本ゼオン (株) 製ゼォノア、 ゼォネックス、 J S R ( 株) 製ァ一トン) など) 、 ポリスルホン、 ポリエーテルスルホン、 ポリアリレー ト、 ポリエーテルイミ ド、 ポリメチルメタクリレートおよびポリエーテルケトン などのフィルムが好ましい。 フィルムの厚みは 2 0〜5 0 0 /mが好ましく、 薄 すぎると膜強度が弱く、 厚いとスティフネスが大きくなり過ぎ、 8 0〜2 0 0〃 mがより好ましい。 ここで、 2 0〜5 0 0 /mとは 「2 0 zm以上 5 0 0 /m以 下」 を意味する。 本発明において、 以下同様である。 基材フィルムは透明である ことが好ましく、 透明基材フィルムの光透過率は、 4 0 0 ηπ!〜 7 8 0 nmの波 長範囲において 8 0 %以上、 より好ましくは 9 0 %以上であることが好ましい。 フィルム以外のシート状、 パネル状の基材、 好ましくは透明基材に本発明におけ るハードコート層を適用することも当然可能である。 Hereinafter, embodiments of the present invention will be described in detail. As the substrate film used in the hard coat film of the present invention, a plastic film is preferable, and polyester such as polyethylene terephthalate and polyethylene naphthate, and cellulose such as poly-carbonate, carbonate, triacetyl cellulose and diacetyl cellulose. Resins, polyolefins (polystyrene such as polypropylene, polyethylene, polymethylpentene, and syndiotactic polystyrene, norbornene-based resins such as cyclic olefins (eg, Zeonor, Zeonex, and Oneton manufactured by Zeon Corporation, JSR Corporation) Etc.), films of polysulfone, polyether sulfone, polyarylate, polyether imide, polymethyl methacrylate and polyether ketone are preferred. The thickness of the film is preferably from 20 to 500 / m. If it is too thin, the film strength is low, and if it is too thick, the stiffness becomes too large, and more preferably from 80 to 200 m. Here, 20 to 500 / m means “not less than 20 zm and not more than 500 / m”. In the present invention, the same applies hereinafter. The substrate film is preferably transparent, and the light transmittance of the transparent substrate film is 400 ηπ! It is preferably at least 80%, more preferably at least 90%, in the wavelength range of up to 780 nm. It is of course possible to apply the hard coat layer of the present invention to a sheet-like or panel-like substrate other than a film, preferably to a transparent substrate.
基材フィルムの変形を少なくするためには、 基材フィルムの弾性率を大きくす ることが有効であるが、 もう一方で、 ハードコート層の変形を少なくし、 基材フ ィルムへの応力を少なくすることを検討した結果、 ハードコ一ト層の剛直性を大 きくすることが有効であることを見出した。 ハードコート層の剛直性は弾性率と 膜厚に関係する曲げ剛性の大きさに比例する。 ハードコート層の曲げ剛性に関係 する弾性率 X (膜厚の三乗) を特定の範囲にし、 剛直性を大きくすることにより、 目的の鉛筆硬度の向上を達成できる。 ハードコート層の曲げ剛性が小さいと、 ノヽ —ドコート層自身が変形し易く鉛筆試験の荷重が基材フィルムにかかってしまい、 基材フィルムが変形してしまう。 ハードコート層の曲げ剛性を大きくすることに より、 鉛筆試験の荷重による変形が少なくなり、 基材フィルムの変形を抑えるこ とができる。 曲げ剛性を大きくすることが好ましいが、 ロールで取り扱う等のた め、 基材フィルムとしては一定の曲げ剛性以下である必要がある。 ハードコート 層の表面弾性率とハードコート層厚みの三乗の積は、 3 0 K P a ' mm3〜7 0 0 K P a · mm3 であることが好ましく、 1 0 O K P a · mm3〜4 0 O K P a • mm3 であることが特に好ましい。 In order to reduce the deformation of the base film, it is effective to increase the elastic modulus of the base film, but on the other hand, to reduce the deformation of the hard coat layer and reduce the stress on the base film. As a result of studying the reduction, it was found that it is effective to increase the rigidity of the hard coat layer. The rigidity of the hard coat layer is proportional to the flexural rigidity, which is related to the elastic modulus and film thickness. By increasing the elasticity X (thickness of the film thickness) related to the bending stiffness of the hard coat layer to a specific range and increasing the rigidity, the desired improvement in pencil hardness can be achieved. If the bending stiffness of the hard coat layer is low, the node coat layer itself is easily deformed, and the load of the pencil test is applied to the base film, and the base film is deformed. By increasing the bending stiffness of the hard coat layer, deformation due to the load in the pencil test is reduced, and deformation of the base film can be suppressed. It is preferable to increase the bending stiffness, but it is necessary that the substrate film has a certain bending stiffness or less for handling by rolls. Cube of the product of the surface elastic modulus and the hard coat layer thickness of the hard coat layer is preferably from 3 0 KP a 'mm 3 ~7 0 0 KP a · mm 3, 1 0 OKP a · mm 3 ~4 0 OKP a • mm 3 is particularly preferred.
鉛筆硬度試験による傷を防止するためにはハードコート層自身の硬度がある程 度大きいことが好ましく、 ハードコート層の表面弾性率は 4. OGPa以上、 好 ましくは 4. 5 GP a以上である。 表面弾性率が 4. OGPa未満のハードコー ト層では、 十分な鉛筆硬度及び耐傷性が得られない場合がある。 To prevent scratches due to the pencil hardness test, the hard coat layer The surface elastic modulus of the hard coat layer is preferably at least 4. OGPa, and more preferably at least 4.5 GPa. With a hard coat layer having a surface elastic modulus of less than 4. OGPa, sufficient pencil hardness and scratch resistance may not be obtained.
一方、 硬度を高めるには表面弾性率を大きくすることが有効であるが、 脆性が 悪化することがあり、 表面弾性率は好ましくは 9. OGPa以下、 より好ましく は 7. OGPa以下である。  On the other hand, it is effective to increase the surface elastic modulus to increase the hardness, but the brittleness may deteriorate, and the surface elastic modulus is preferably 9. OGPa or less, more preferably 7. OGPa or less.
ハードコート層の表面弾性率は、 4. OGPa以上 9. OGPa以下であるこ とが好ましく、 4. 5GPa以上 7. 0 G P a以下であることがさらに好ましい。 ハードコート層の表面弾性率は、 熱又は活性エネルギー線により硬化する硬化 性組成物に用いられる多官能モノマーの選択や重合性基を含有するポリマーの添 加により、 架橋密度を変化させることで調整することができる。 また、 ハードコ —ト層に、 シリカ、 アルミナ、 チタニアなどの金属酸化物の無機微粒子や架橋ポ リマーなどの有機微粒子を添加することによつても調整することができる。  The surface elastic modulus of the hard coat layer is preferably from 4. OGPa to 9. OGPa, and more preferably from 4.5 GPa to 7.0 GPa. The surface elastic modulus of the hard coat layer is adjusted by changing the cross-linking density by selecting a polyfunctional monomer used for the curable composition that is cured by heat or active energy rays, or by adding a polymer containing a polymerizable group. can do. It can also be adjusted by adding inorganic fine particles of a metal oxide such as silica, alumina or titania or organic fine particles such as a crosslinked polymer to the hard coat layer.
本発明のハードコート層の厚みは、 10 /m以上が好ましく、 さらに 20 m 以上が好ましい。 厚みを厚くすると鉛筆硬度は向上するが、 フィルムを曲げるこ とが難しくなり、 さらに曲げによる割れが発生しやすくなることから、 60〃m 以下、 さらに 5 O zm以下が好ましい。 より好ましくは 10〜6 O mであり、 特に好ましくは 20〜60〃mであり、 最も好ましくは 20〜50 zmである。 ハードコート層は少なくとも 1層からなるものであり、 さらに 2層以上の形態も 可能である。  The thickness of the hard coat layer of the present invention is preferably at least 10 / m, more preferably at least 20 m. When the thickness is increased, the pencil hardness is improved, but it is difficult to bend the film, and cracking due to bending is more likely to occur. Therefore, the thickness is preferably 60 m or less, more preferably 5 Ozm or less. It is more preferably from 10 to 6 Om, particularly preferably from 20 to 60 m, most preferably from 20 to 50 zm. The hard coat layer is composed of at least one layer, and may be in a form of two or more layers.
本発明においては、 ハードコート層を外側にして丸め、 ハードコート層にヒビ 割れが発生するときの巻きの直径で表されるハードコートの割れ性を小さくする ことが好ましい。 本発明のハードコート層の割れ性は、 好ましくは 150 mm以 下であり、 さらに好ましくは 8 Omm以下である。  In the present invention, it is preferable that the hard coat layer be rounded with the outer side being rounded, so as to reduce the crackability of the hard coat represented by the diameter of the winding when cracks occur in the hard coat layer. The crackability of the hard coat layer of the present invention is preferably 150 mm or less, and more preferably 8 Omm or less.
本発明に用いるハードコート層には公知の硬ィ匕性組成物を用いることができる c 硬化性組成物には、 熱硬化性組成物、 活性エネルギー線重合性組成物などがある 熱硬ィ匕性組成物としてメラミン樹脂、 ウレタン樹脂、 エポキシ樹脂などのプレボ リマーの架橋反応ゃシリケートのゾルゲル反応を利用するものを用いることが可 能であるが、 反応の制御のしゃすさの点で活性エネルギー線重合性樹脂が好まし く用いられる。 Known hardening compositions can be used for the hard coat layer used in the present invention. C Curable compositions include thermosetting compositions and active energy ray polymerizable compositions. It is possible to use a cross-linking reaction of prepolymers such as melamine resin, urethane resin, epoxy resin, etc., which is based on the sol-gel reaction of silicate, but the active energy ray is difficult to control the reaction. Polymerizable resin is preferred Commonly used.
本発明におけるハ一ドコ一ト層は、 活性エネルギー線の照射により硬ィ匕された 硬化性組成物を主体とする層であることが好ましい。  The hard coat layer in the present invention is preferably a layer mainly composed of a curable composition hardened by irradiation with active energy rays.
本発明において 「活性エネルギー線の照射により硬化された硬化性組成物を主 体とする層」 とは、 活性エネルギー線による硬化性組成物の他に、 後出の無機あ るいは有機微粒子、 重合開始剤、 その他の添加剤を含有しても良いことを意味す る。  In the present invention, “a layer mainly composed of a curable composition cured by irradiation with active energy rays” means, in addition to the curable composition by active energy rays, inorganic or organic fine particles described later, It means that an initiator and other additives may be contained.
一般に用いられる活性エネルギー線照射により反応する多官能性の重合基や架 橋基を有する化合物を含有する硬化性組成物は、 硬化時に体積収縮が起こり、 膜 厚を厚くするとカールが大きくなるという問題を有している。 カールを小さくす るためには、 硬ィ匕時の収縮が小さいことが好ましい。 25°Cにおける硬化前後の 体積収縮率は 0~1 5%、 好ましくは 0〜13%、 より好ましくは 0〜1 1%で ある。  Generally used curable compositions containing compounds having a polyfunctional polymerizable group or a bridging group that react by irradiation with active energy rays are subject to volume shrinkage during curing, and the curl increases as the film thickness increases. have. In order to reduce the curl, it is preferable that the shrinkage at the time of hardening is small. The volume shrinkage before and after curing at 25 ° C. is 0 to 15%, preferably 0 to 13%, and more preferably 0 to 11%.
硬化による体積収縮率は、 硬化性組成物の硬化前後の密度変化から求めること ができ、 具体的には、 マイクロメトリック社製 MULT I VOLUME PYC The volume shrinkage due to curing can be determined from the change in density of the curable composition before and after curing. Specifically, MULTI VOLUME PYC manufactured by Micrometrics Inc.
NOMETERで測定 (25°C) した密度を用い数式 Aから求めた値である。 数式 A:体積収縮率 = { 1― (硬化前密度/硬化後密度) } X 100 (%) ハードコー卜層の硬化時の体積収縮率を小さくすることにより、 ハードコート 層を基材フィルムに積層したハードコートフィルムの力一ルを小さくすることが 可能になる。 実用上、 25°C60%RHでのハードコートフィルムのカール値は、 マイナス 15からプラス 15の範囲にあることが好ましい。 This is the value obtained from Equation A using the density measured by NOMETER (25 ° C). Formula A: Volume shrinkage = {1-(density before curing / density after curing)} X 100 (%) The hard coat layer is laminated to the substrate film by reducing the volume shrinkage during curing of the hard coat layer. It is possible to reduce the force of the hard coat film. Practically, the curl value of the hard coat film at 25 ° C. and 60% RH is preferably in the range of minus 15 to plus 15.
また、 ハードコートの膜厚に対するカール値の値、 つまりカール値をハードコ Also, the value of the curl value with respect to the thickness of the hard coat, that is,
—トの膜厚 (j m) で割った値 (絶対値) が小さくなることが好ましく、 その値 は 0.45 ( 1/ (m · μ- ) ) 以下が好ましく、 さらに 0 · 35 (1/ (m - jum) ) 以下であることが好ましい。 It is preferable that the value (absolute value) divided by the film thickness (jm) of the substrate be smaller, and the value be 0.45 (1 / (m · μ-)) or less, more preferably 0 · 35 (1 / (m -jum)) It is preferred that:
ここで力ール値は下記数式 Bで求められる値である。  Here, the force value is a value obtained by the following formula B.
数式 B :カール値 = 1/R (Rはカールの曲率半径 (m) )  Formula B: Curl value = 1 / R (R is the radius of curvature of the curl (m))
また、 ハードコート層は吸湿量により体積が膨張 '収縮することがある。 25 The volume of the hard coat layer may expand and contract depending on the amount of moisture absorption. twenty five
°C10%RHと 25°C80%RHにおけるカール値の差の絶対値が 24以下であ ることが好ましい。 カール値の変化を抑えるには、 活性エネルギー線照射による 硬化後の硬化性組成物の親水性は小さい方が好ましく、 親水性に関係する硬化後 の硬化性組成物の I/O値が 0. 1〜0. 85であることが好ましい。 さらに好 ましくは 0. 25〜0. 8、 最も好ましくは 0. 35~0. 75である。 I/O 値が 0. 85を超えると、 硬化により生成した重合体の親水性が高くなり、 ハー ドコート層の体積膨張や硬度が湿度の影響を大きく受けるようになり、 高い表面 硬度を持ちつつ、 カール特性の良好なハ一ドコートフィルムが得にくい傾向があ る。 I/O値が小さくなりすぎると吸湿膨張が小さく常湿でのカールが大きいこ とがある。 The absolute value of the difference between the curl value at 10% RH at 25 ° C and 80% RH at 25 ° C is 24 or less. Preferably. In order to suppress the change in the curl value, it is preferable that the curability of the curable composition after curing by irradiation with active energy rays is small, and the I / O value of the curable composition after curing related to hydrophilicity is 0. It is preferably from 1 to 0.85. More preferably, it is 0.25 to 0.8, most preferably 0.35 to 0.75. When the I / O value exceeds 0.85, the polymer produced by curing becomes more hydrophilic, and the volume expansion and hardness of the hard coat layer are greatly affected by humidity, and the high surface hardness is maintained. However, it tends to be difficult to obtain a hard coat film having good curl characteristics. If the I / O value is too small, the moisture expansion may be small and the curl at normal humidity may be large.
上記 I/O値は、 藤田穆著 「系統的有機定性分析 純粋物編」 (風間書房、 1 970年発行) 、 甲田善生著 「有機概念図」 (三共出版、 1984年発行) 等に 記載の方法によって求めた 「無機性 (I) /有機性 (0) 」 値である。 I/O値 は有機化合物の色々な物理化学的な性状を予測するための一手段として用いられ る。 有機性は炭素数の大小の比較で、 無機性は炭素同数の炭化水素の沸点の比較 で大小が得られる。 例えば、 (一 CH2 —) (実際は C) 1個は有機性値 20と 決め、 無機性は水酸基 (-OH) が沸点へ及ぼす影響力から、 その無機性値を 1 00と決めたものである。 この (一 OH)の無機性値 100を基準にして他の置 換基 (無機性基) の値を求めたものが 「無機性基表」 として示されている。 ハー ドコート層を形成する硬化性組成物に活性エネルギー線を照射し硬化した後の組 成物における、 上記の無機性値と有機性値の比を I/O値として用いた。 即ち、 活性エネルギー線照射により硬ィ匕した硬化性組成物の I/O値は、 活性エネルギ —線の照射により生成した重合体の繰り返し単位ごとの I / 0値に、 各繰り返し 単位の質量分率を掛けて、 合計した値である。 活性エネルギー線照射により硬ィ匕 した硬化性組成物の I/O値を 0. 1〜0. 85とするには、 硬化前の硬化性組 成物の組成を適切に設定することにより可能である。 例えば、 硬化組成物中の— OH、 一 COOR、 一NH2 、 一CO—、 等の基を少なくすることにより I/O 値は 0. 1〜0. 85に制御できる。 The above I / O values are described in Atsushi Fujita, "Systematic Organic Qualitative Analysis, Pure Products" (Kazama Publishing, 1970), Yoshio Koda, "Organic Conceptual Diagram" (Sankyo Publishing, 1984), etc. It is the "inorganic (I) / organic (0)" value obtained by the method. I / O values are used as a means to predict various physicochemical properties of organic compounds. Organic can be compared by comparing the number of carbon atoms, and inorganic can be compared by comparing the boiling points of hydrocarbons with the same number of carbons. For example, one (one CH 2 —) (actually C) is determined to have an organic value of 20, and the inorganic value is determined to be 100 due to the effect of the hydroxyl group (-OH) on the boiling point. is there. The values of other substituents (inorganic groups) obtained based on the inorganic value of (-OH) of 100 are shown in the “Inorganic Group Table”. The ratio of the above-mentioned inorganic value and organic value in the composition after irradiating the curable composition forming the hard coat layer with active energy rays and curing was used as the I / O value. That is, the I / O value of the curable composition cured by irradiation with active energy rays is calculated as the I / O value of each repeating unit of the polymer formed by irradiation with active energy rays, and the mass fraction of each repeating unit. Multiplied by the rate, the total value. The I / O value of the curable composition hardened by irradiation with active energy rays can be adjusted to 0.1 to 0.85 by appropriately setting the composition of the curable composition before curing. is there. For example, the I / O value can be controlled to 0.1 to 0.85 by reducing the groups such as —OH, —COOR, —NH 2 , and —CO— in the cured composition.
さらに、 硬化性組成物の I/O値を上記の範囲に抑えることにより、 吸湿量を 減らすことができる。 本発明のハードコート層の 25°C60%RHにおける吸湿 量は、 乾燥時のハードコート層に対して 3質量%以下にすることが好ましく、 2 . 5質量%以下がより好ましく、 2質量%以下が最も好ましい。 Further, by controlling the I / O value of the curable composition within the above range, the amount of moisture absorption can be reduced. Moisture absorption of the hard coat layer of the present invention at 25 ° C and 60% RH The amount is preferably 3% by mass or less, more preferably 2.5% by mass or less, most preferably 2% by mass or less based on the hard coat layer at the time of drying.
本発明のハードコート層として好ましく用いられる活性エネルギー線重合性樹 脂層は、 多官能モノマ一および/または重合性官能基あるいは架橋性反応基を側 鎖に有するオリゴマー、 ポリマーと重合開始剤を含む塗布液を上記の基材フィル ム上に塗布し、 多官能モノマー、 オリゴマー、 ポリマ一を重合させることにより 形成できる。 これらの活性エネルギー線重合性樹脂層の重合性官能基としては、 ラジカル重合性不飽和二重結合基ゃ開璟重合性の環状エーテル基が好ましい。 重合性不飽和二重結合基としては、 ァクリロイル基、 メ夕クリロイル基、 ビニ ル基、 ァリル基などを挙げることができ、 反応性の観点よりァクリロイル基、 メ 夕ァクリロイル基が好ましく用いられる。 多官能重合性不飽和二重結合基含有モ ノマ一の具体例としては、 エチレングリコールジ (メタ) ァクリレート、 ジェチ レングリコールジ (メタ) ァクリレートなどのグリコール系の (メタ) ァクリレ ート、 n—へキサンジオールジ (メタ) ァクリレート、 トリメチロールプロパン トリ (メタ) ァクリレート、 ジトリメチロールプロパントリ (メタ) ァクリレ一 ト、 ジトリメチロールプロパンテトラ (メタ) ァクリレート、 ペン夕エリスリ 卜 ールトリ (メ夕) ァクリレート、 ペン夕エリスリ トールテトラ (メタ) ァクリレ —ト、 ジペン夕エリスリ トールペン夕 (メタ) ァクリレー卜、 ジペン夕エリスリ トールへキサ (メタ) ァクリレート、 1, 4—シクロへキサンジォ一ルジ (メタ ) ァクリレート、 1, 3, 5 —シクロへキサントリオールトリ (メタ) ァクリレ ート、 アジピン酸、 セバシン酸、 フ夕ル酸、 イソフ夕ル酸、 テレフタル酸とグリ コール (エチレングリコ一ル、 ポリエチレングリコール、 プロピレングリコール など) やトリオール (グリセリン、 トリメチロールプロパンなど) の反応による ポリエステル系ポリオールのオリゴマーと (メタ) ァクリレートの反応物などの ポリオールポリアクリレート類、 ビスフエノール Aとグリシジル (メタ) ァクリ レート、 へキサンジォ一ルとグリシジル (メタ) ァクリレートの反応物などのェ ポキシァクリレート類、 ポリイソシァネートとポリオールの縮合生成物からなる ポリイソシァネートポリウレタン系オリゴマーとヒドロキシェチル (メタ) ァク リレートなどの水酸基含有ァクリレートの反応によって得られるウレ夕ンァクリ レート類などを挙げることができる。 The active energy ray polymerizable resin layer preferably used as the hard coat layer of the present invention contains a polyfunctional monomer and / or an oligomer, a polymer having a polymerizable functional group or a crosslinkable reactive group in a side chain, and a polymerization initiator. It can be formed by applying a coating liquid on the above-mentioned base film and polymerizing a polyfunctional monomer, oligomer or polymer. As the polymerizable functional group of the active energy ray polymerizable resin layer, a radical polymerizable unsaturated double bond group / open-opening polymerizable cyclic ether group is preferable. Examples of the polymerizable unsaturated double bond group include an acryloyl group, a methyl acryloyl group, a vinyl group and an aryl group. From the viewpoint of reactivity, an acryloyl group and a methyl acryloyl group are preferably used. Specific examples of a monomer having a polyfunctional polymerizable unsaturated double bond group include glycol-based (meth) acrylates such as ethylene glycol di (meth) acrylate and ethylene glycol di (meth) acrylate, and n— Hexanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, ditrimethylolpropanetri (meth) acrylate, ditrimethylolpropanetetra (meth) acrylate, pentaerythritol tri (meth) acrylate, pen Erythritol tetra (meth) acrylate, dipentyl erythritol pentyl (meth) acrylate, dipentyl erythritol hexyl (meth) acrylate, 1,4-cyclohexanedioldi (meth) acrylate, 1,3 , 5 —cyclohexanetrio Rutri (meth) acrylate, adipic acid, sebacic acid, fulic acid, isophthalic acid, terephthalic acid and glycols (ethylene glycol, polyethylene glycol, propylene glycol, etc.) and triols (glycerin, trimethylolpropane) Polyols such as oligomers of polyester-based polyols and (meth) acrylates, etc., bisphenol A and glycidyl (meth) acrylates, hexanediol and glycidyl (meth) acrylates, etc. By the reaction of a polyisocyanate polyurethane oligomer composed of a condensation product of polyepoxyacrylates and polyisocyanate with a polyol and a hydroxyl group-containing acrylate such as hydroxyethyl (meth) acrylate. Obtained urethane evening Nakuri Rates and the like can be mentioned.
また、 開環重合性環状エーテル化合物しては、 エポキシ誘導体、 ォキセタン誘 導体、 テトラヒドロフラン誘導体、 ォキサゾリン誘導体などの環状イミノエ一テ ル類などが挙げられ、 特にエポキシ誘導体、 ォキセタン誘導体、 ォキサゾリン誘 導体が好ましい。  Examples of the ring-opening polymerizable cyclic ether compound include epoxy derivatives, oxetane derivatives, tetrahydrofuran derivatives, and cyclic imino ethers such as oxazoline derivatives.Epoxy derivatives, oxetane derivatives, and oxazoline derivatives are particularly preferable. .
これらの開環重合性環状エーテル化合物は、 上記のような環状構造を 2個以上 好ましくは 3個以上同一分子内に有する化合物が好ましい。 例えば 3官能グリシ ジルェ一テルとしてはトリメチロールェタントリグリシジルエーテル、 トリメチ ロールプロパントリグリシジルエーテル、 グリセロールトリグリシジルェ一テル、 トリグリシジルトリスヒドロキシェチルイソシァヌレートなど、 4官能以上のグ リシジルエーテルとしてはソルビトールテトラグリシジルエーテル、 ペン夕エリ スリ ト一ルテトラグリシルエーテル、 クレゾ一ルノボラヅク樹脂のポリグリシジ ルエーテル、 フエノールノボラック樹脂のポリグリシジルエーテルなど、 3官能 以上のエポキシ類としてはェポリード G T— 3 0 1、 ェポリード G T— 4 0 1、 E H P E (以上、 ダイセル化学工業 (株) 製) 、 フエノールノボラック樹脂のポ リシクロへキシルエポキシメチルエーテルなど、 3官能以上のォキセタン類とし ては O X—S Q、 P N O X - 1 0 0 9 (以上、 東亞合成 (株) 製) などが挙げら れる。  These ring-opening polymerizable cyclic ether compounds are preferably compounds having two or more, preferably three or more, of the above-mentioned cyclic structures in the same molecule. For example, trifunctional glycidyl ethers such as trimethylolethane triglycidyl ether, trimethylolpropane triglycidyl ether, glycerol triglycidyl ether, triglycidyl trishydroxyethyl isocyanurate, etc. Epoxides with three or more functionalities are epoxy resin GT-301, such as sorbitol tetraglycidyl ether, pen erythritol tetraglycyl ether, polyglycidyl ether of cresol novolak resin, and polyglycidyl ether of phenol novolak resin. EPOLIDE GT—401, EHPE (above, manufactured by Daicel Chemical Industries, Ltd.), phenolic novolak resin polycyclohexyl epoxy methyl ether, etc. Examples include OX—SQ and PNOX-109 (all manufactured by Toagosei Co., Ltd.).
表面弾性率の調整、 硬化収縮を低減、 密着性改良などのため、 必要に応じて単 官能のモノマ一を多官能モノマーに添加することも可能である。 単官能のモノマ —としては、 メチル (メタ) ァクリレート、 プチル (メタ) ァクリレートなどの アクリル酸のアルキルエステル、 ヒドロキシェチル (メタ) ァクリレート、 ジメ チルアミノエチル (メタ) ァクリレート、 グリシジル (メタ) ァクリレートなど の極性基含有のアクリル酸エステル、 (メタ) アクリルアミ ド、 N—メチロール (メタ) アクリルアミ ドなどのアクリルアミド、 N—ビニルピロリドン、 スチレ ン、 ビニルアセテート、 無水マレイン酸などの既存のモノマーが挙げられる。 一方、 同一分子内に 1個もしくは 2個の閧環重合性基を有する化合物も必要に 応じて併用することができ、 好ましい化合物としては単官能または 2官能のグリ シジルエーテル類、 単官能または 2官能の脂璟式エポキシ類、 単官能または 2官 能のォキセタン類が挙げられ、 種々の市販もしくは公知の化合物を使用すること ができる。 If necessary, a monofunctional monomer can be added to the polyfunctional monomer to adjust the surface elasticity, reduce curing shrinkage, and improve adhesion. Monofunctional monomers — alkyl esters of acrylic acid such as methyl (meth) acrylate and butyl (meth) acrylate; hydroxyethyl (meth) acrylate; dimethylaminoethyl (meth) acrylate; glycidyl (meth) acrylate Acrylic esters containing polar groups such as acrylamides such as (meth) acrylamide, N-methylol (meth) acrylamide, and existing monomers such as N-vinylpyrrolidone, styrene, vinyl acetate, and maleic anhydride. Can be On the other hand, compounds having one or two ring-polymerizable groups in the same molecule can be used in combination, if necessary. Preferred compounds are monofunctional or bifunctional glycidyl ethers, monofunctional or bifunctional glycidyl ethers. Functional epoxies, monofunctional or two-functional Oxetanes, and various commercially available or known compounds can be used.
また、 同様に、 少なくとも 2個以上のラジカル重合性基を含有するオリゴマー あるいはポリマーを多官能モノマーに添カ卩することも可能である。 ラジカル重合 性基を含有するオリゴマーあるいはポリマーとしては、 (メタ) ァクリロイル基、 ァリル基などの重合性基をペンダント基に有するオリゴマー ·ポリマーがあり、 例としては、 水酸基を有するオリゴマー 'ポリマーと (メタ) アクリル酸から合 成されるエステル誘導体、 カルボン酸を有するオリゴマー ·ポリマーと水酸基含 有 (メタ) アクリル酸エステル (ヒドロキシェチル (メタ) ァクリレートなど) ゃァリルアルコールなどから合成されるエステル誘導体、 グリシジル (メタ) ァ クリレートなどのエポキシ閧環重合体ォリゴマ一 ·ポリマー、 ク口ルェチル基を 有するオリゴマー ·ポリマ一の脱塩酸反応により合成されるァクリロイル基を導 入した重合体などが挙げられる。  Similarly, it is also possible to add an oligomer or polymer containing at least two or more radically polymerizable groups to a polyfunctional monomer. Examples of the oligomer or polymer containing a radical polymerizable group include oligomers and polymers having a polymerizable group such as a (meth) acryloyl group or an aryl group in a pendant group. Examples thereof include an oligomer having a hydroxyl group and a polymer having a hydroxyl group. ) Ester derivatives synthesized from acrylic acid, oligomers and polymers containing carboxylic acid and hydroxyl-containing (meth) acrylic acid esters (such as hydroxyethyl (meth) acrylate) ester derivatives synthesized from polyaryl alcohol, etc. Examples include epoxy ring polymer such as glycidyl (meth) acrylate, a polymer, an oligomer having a quenched acetyl group, and a polymer into which an acryloyl group is introduced by a dehydrochlorination reaction of a polymer.
また、 同一分子内に 3個以上の開環重合性基を有する化合物として、 式 ( 1 ) で表される繰り返し単位を含む架橋性ポリマーを含有していることが特に好まし い。 式 ( 1 ) の式中 R 1 は水素原子もしくは炭素原子数 1以上 4以下のアルキル 基を表し、 好ましくは水素原子もしくはメチル基である。 L 1 は単結合もしくは 二価の連結基であり、 好ましくは単結合、 一 0—、 アルキレン基、 ァリーレン基 および *側で主鎖に連結する *一 C O 0—、 * _ C O N H―、 *— O C O—ヽ * — N H C O—である。 P 1 は閧環重合性基を含む一価の基であり、 好ましい P 1 としては、 エポキシ璟、 ォキセタン環、 テトラヒドロフラン環、 ラクトン環、 力 —ボネート環、 ォキサゾリン璟などのィミノエーテル環などを含む一価の基が挙 げられ、 この中でも特に好ましくはエポキシ環、 ォキセタン環、 ォキサゾリン璟 を含む一価の基である。 It is particularly preferable that the compound having three or more ring-opening polymerizable groups in the same molecule contains a crosslinkable polymer containing a repeating unit represented by the formula (1). In the formula (1), R 1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and is preferably a hydrogen atom or a methyl group. L 1 is a single bond or a divalent linking group, preferably a single bond, a 10—, an alkylene group, an arylene group, and a * 0-CO *, * _CONH—, * — linked to the main chain on the * side. OCO— ヽ * —NHCO—. P 1 is a monovalent group containing a閧環polymerizable group, preferred P 1, epoxy璟, Okisetan ring, a tetrahydrofuran ring, a lactone ring, the force - Boneto ring one, including Iminoeteru rings such Okisazorin璟And a monovalent group containing an epoxy ring, an oxetane ring, or an oxazoline group.
本発明の式 (1 ) で表される繰り返し単位を含む架橋性ポリマ一は、 対応する モノマーを重合させて合成することが簡便で好ましい。 この場合の重合反応とし てはラジカル重合が最も簡便で好ましい。 具体例としては、 ポリグリシジルメ夕 クリレート、 ポリメチルグリシジルメ夕クリレート、 ポリエポキシシクロへキシ ルメチルメ夕クリレート、 ポリ一 3—ェチルー 3—ォキセ夕ニルメチルメ夕クリ レートなどが挙げられる。 The crosslinkable polymer of the present invention containing a repeating unit represented by the formula (1) is preferably synthesized simply by polymerizing a corresponding monomer. As the polymerization reaction in this case, radical polymerization is the simplest and preferable. Specific examples include polyglycidyl methacrylate, polymethyl glycidyl methacrylate, polyepoxycyclohexylmethyl methacrylate, and poly (3-ethyl) -3-oxenyl dimethylmethyl methacrylate. Rates and the like.
式 (1) Equation (1)
Figure imgf000013_0001
Figure imgf000013_0001
式中 R1 は水素原子もしくは炭素原子数 1以上 4以下のアルキル基を表し、 P 1 は閧環重合性基を含む一価の基であり、 L1 は単結合もしくは二価の連結基で ある。 In the formula, R 1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, P 1 is a monovalent group containing a cyclic polymerizable group, and L 1 is a single bond or a divalent linking group. is there.
式 (1) で表される繰り返し単位の好ましい具体例を以下に示すが、 本発明に 使用できる架橋性ポリマーはこれらの具体例に限定されるものではない。 Preferred specific examples of the repeating unit represented by the formula (1) are shown below, but the crosslinkable polymer that can be used in the present invention is not limited to these specific examples.
Figure imgf000014_0001
Figure imgf000014_0001
22 C0〇〇H〇H〇 22 C0〇〇H〇H〇
2 :: COOCH〇H。  2 :: COOCH〇H.
、0工  , 0
()E2-
Figure imgf000015_0001
() E2-
Figure imgf000015_0001
- (E-21) (E-22) - (E-21) (E-22)
Figure imgf000016_0001
前記の多官能重合性不飽和二重結合基含有モノマ一あるいはォリゴマ一、 ポリ マ一と多官能環状構造含有化合物とを混合して用いることもできる。
Figure imgf000016_0001
The polyfunctional polymerizable unsaturated double bond group-containing monomer or polymer or polymer and the polyfunctional cyclic structure-containing compound may be used in combination.
単官能のモノマー、 少なくとも 2個以上の重合性不飽和二重結合基を含有する ォリゴマ一あるいはポリマー又は開環重合性の環状エーテル化合物を添加する場 合には、 多官能重合性不飽和二重結合含有モノマーに対する添加量は 5 0質量% 以下が好ましく、 3 5質量%以下がさらに好ましい。 単官能のモノマー、 少なく とも 2個以上の重合性不飽和二重結合基を含有するオリゴマ一あるいはポリマ一 又は開環重合性の環状エーテル化合物の割合が多くなり過ぎると所望の硬度が得 られなくなる。  When adding a monofunctional monomer, an oligomer containing at least two or more polymerizable unsaturated double bond groups or a polymer or a ring-opening polymerizable cyclic ether compound, a polyfunctional polymerizable unsaturated double bond The amount added to the bond-containing monomer is preferably 50% by mass or less, more preferably 35% by mass or less. If the proportion of monofunctional monomers, oligomers or polymers containing at least two or more polymerizable unsaturated double bond groups or ring-opening polymerizable cyclic ether compounds becomes too large, the desired hardness cannot be obtained. .
これらの活性エネルギー線重合性樹脂層に、 無機ある 、は有機微粒子を添加し、 ハードコート層の表面弾性率を調節したり、 硬化収縮率を小さくすることにより ハードコートフィルムの力ールを減少することができる。 微粒子としては、 無機酸化物や内部架橋のポリマー樹脂粒子が挙げられる。 無 機酸化物粒子としては硬度が高いものが好ましく、 モース硬度が 6以上の無機酸 化物粒子が好ましい。 例えば、 二酸化ケイ素粒子、 二酸チタン粒子、 酸化ジルコ ニゥム粒子、 酸化アルミニウム粒子などが含まれる。 Inorganic or organic fine particles are added to these active energy ray polymerizable resin layers to adjust the surface elastic modulus of the hard coat layer or reduce the curing shrinkage to reduce the force of the hard coat film. can do. Examples of the fine particles include inorganic oxides and internally crosslinked polymer resin particles. As the inorganic oxide particles, those having a high hardness are preferable, and inorganic oxide particles having a Mohs hardness of 6 or more are preferable. Examples include silicon dioxide particles, titanium dioxide particles, zirconium oxide particles, aluminum oxide particles, and the like.
有機微粒子としては、 例えば、 アクリル樹脂、 ポリスチレン、 ポリシロキサン、 メラミン樹脂、 ベンゾグアナミン樹脂、 ポリテトラフルォロエチレン、 セル口一 スアセテート、 ポリカーボネート、 ナイロンなどの樹脂粒子などがあり、 それら の中でポリメ夕クリル酸メチル (ジビニルベンゼン共重合体) 、 ポリシロキサン、 ポリスチレン、 メラミン樹脂及びべンゾグアナミン樹脂、 またこれら複合体から なる粒子が好ましい。 さらに、 2官能以上の重合基を有するモノマーとの共重合 による内部架橋のポリマ一樹脂微粒子が好ましい。  Examples of the organic fine particles include resin particles such as acrylic resin, polystyrene, polysiloxane, melamine resin, benzoguanamine resin, polytetrafluoroethylene, cellulose acetate, polycarbonate, nylon, and the like. Particles composed of methyl acrylate (divinylbenzene copolymer), polysiloxane, polystyrene, melamine resin, benzoguanamine resin, and a complex thereof are preferred. Further, internally crosslinked polymer resin fine particles obtained by copolymerization with a monomer having a bifunctional or higher functional group are preferred.
これらの微粒子の体積平均粒子径は、 1 nm以上 4 0 0 nm以下、 より好まし くは 5 nm以上 2 0 0 nm以下、 さらに好ましくは 1 0 nm以上 1 0 0 nm以下 である。 l nm以下では分散が難しく凝集粒子ができ、 4 0 0 nm以上ではヘイ ズが大きくなり、 どちらも透明性を落としてしまい好ましくない。  The volume average particle diameter of these fine particles is 1 nm or more and 400 nm or less, more preferably 5 nm or more and 200 nm or less, and still more preferably 10 nm or more and 100 nm or less. At lnm or less, dispersion is difficult and aggregated particles are formed. At more than 400nm, the haze increases, and both are unfavorable because transparency is reduced.
これらの微粒子の添加量は、 活性エネルギー線重合性樹脂層の全量の 5ないし 8 0質量%であることがより好ましく、 1 0ないし 5 0質量%であることがさら に好ましい。  The addition amount of these fine particles is more preferably from 5 to 80% by mass, and even more preferably from 10 to 50% by mass, based on the total amount of the active energy ray-polymerizable resin layer.
一般に無機微粒子は活性エネルギー線重合性樹脂との親和性が悪いため単に両 者を混合するだけでは界面が破壊しやすく、 膜として割れやすく、 耐傷性を改善 することは困難である。 無機微粒子と活性エネルギー線重合性樹脂との親和性を 改良するため、 無機微粒子表面を有機セグメントを含む表面修飾剤で処理するこ とができる。 表面修飾剤は、 一方で無機微粒子と結合を形成し、 他方で活性エネ ルギ一線重合性樹脂と高い親和性を有することが好ましい。 無機微粒子の表面と 結合を生成し得る化合物としては、 シリコン、 アルミニウム、 チタニウム、 ジル コニゥムなどの金属アルコキシド化合物や、 リン酸エステル、 ホスホン酸基、 硫 酸エステル、 スルホン酸基、 カルボン酸基などを有するァニオン性化合物が好ま しい。 また活性エネルギー線重合性樹脂とは化学的に結合させることが好ましく、 末端にビニル性重合基などを導入したものが好適である。 例えば、 エチレン性不 飽和基を重合性基および架橋性基として有するモノマーから活性エネルギー線重 合性樹脂を合成する場合は、 金属アルコキシド化合物またはァニオン性化合物の 末端に重合性不飽和二重結合基や開環重合性環状エーテル基を有していることが 好ましい。 In general, inorganic fine particles have a poor affinity for the active energy ray-polymerizable resin, so that the interface is easily broken by simply mixing the two, the film is easily broken, and it is difficult to improve the scratch resistance. In order to improve the affinity between the inorganic fine particles and the active energy ray polymerizable resin, the surface of the inorganic fine particles can be treated with a surface modifier containing an organic segment. The surface modifier preferably forms a bond with the inorganic fine particles on the one hand, and has a high affinity with the active energy linear polymerizable resin on the other hand. Examples of the compound capable of forming a bond with the surface of the inorganic fine particles include metal alkoxide compounds such as silicon, aluminum, titanium, and zirconium, phosphate esters, phosphonate groups, sulfate esters, sulfonic acid groups, and carboxylic acid groups. An anionic compound having the same is preferred. Further, it is preferable to chemically bond to the active energy ray polymerizable resin, and it is preferable to use a resin in which a vinyl polymer group is introduced at a terminal. For example, ethylenic When synthesizing an active energy ray-polymerizable resin from a monomer having a saturated group as a polymerizable group or a crosslinkable group, a polymerizable unsaturated double bond group or a ring-opening polymerizable compound may be added to the terminal of the metal alkoxide compound or anionic compound. It preferably has a cyclic ether group.
本発明において基材フィルムとしてプラスチックフィルムを用いる場合、 ブラ スチックフィルム自身の耐熱性が低いため、 硬化性樹脂を加熱により硬ィ匕させる 場合は、 できるだけ低温で硬化させることが好ましい。 その場合の加熱温度は、 1 4 0。C以下、 より好ましくは 1 0 0 °C以下である。 一方で光の作用による硬ィ匕 は、 低温で架橋反応が進行する場合が多く、 好ましく用いられる。  In the present invention, when a plastic film is used as the base film, the heat resistance of the plastic film itself is low. Therefore, when the curable resin is hardened by heating, it is preferable to cure at a temperature as low as possible. The heating temperature in that case is 140. C or lower, more preferably 100 ° C. or lower. On the other hand, hardening by the action of light is often used because the crosslinking reaction often proceeds at a low temperature.
ハードコート層に活性エネルギー線重合性樹脂を使用する場合、 活性エネルギ 一線としては、 放射線、 ガンマ一線、 アルファ一線、 電子線、 紫外線などが挙げ られるが、 紫外線が好ましく、 なかでは紫外線によりラジカルもしくはカチオン を発生させる重合開始剤を添加し、 紫外線により硬化させる方法が特に好ましい また紫外線を照射した後、 加熱することにより、 さらに硬ィ匕を進行させることが できる場合があり好ましく用いることができる。 この場合の好ましい加熱温度は 1 4 0 °C以下である。  When an active energy ray polymerizable resin is used for the hard coat layer, examples of the active energy ray include radiation, gamma ray, alpha ray, electron beam, and ultraviolet ray. Particularly preferred is a method of adding a polymerization initiator for generating the above, followed by curing with ultraviolet rays. In addition, by heating after irradiating with ultraviolet rays, it may be possible to further promote the stiffening. The preferable heating temperature in this case is 140 ° C. or less.
光ラジカル重合開始剤の例としては、 ァセトフエノン類、 ベンゾフエノン類、 ミヒラーのケトン、 ペンゾィルベンゾエート、 ベンゾイン類、、 ひ一ァシロキシム エステル、 テトラメチルチウラムモノサルフアイ ド、 およびチォキサントンなど が含まれる。 光重合開始剤に加えて、 光増感剤を用いてもよい。 光増感剤の例に は、 n—プチルァミン、 トリェチルァミン、 トリエタノールァミン、 トリ一 n— ブチルホスフィン、 およびチォキサントンなどが含まれる。  Examples of the photoradical polymerization initiator include acetophenones, benzophenones, Michler's ketone, benzoylbenzoate, benzoins, hyacyloxime ester, tetramethylthiuram monosulfide, and thioxanthone. A photosensitizer may be used in addition to the photopolymerization initiator. Examples of photosensitizers include n-butylamine, triethylamine, triethanolamine, tri-n-butylphosphine, thioxanthone, and the like.
カチオンを発生させる光酸発生剤として、 トリアリールスルホニゥム塩ゃジァ リールョードニゥム塩ゃスルホン酸のニトロべンジルエステルなど化合物が挙げ られ、 有機エレクトロニクス材料研究会編、 「イメージング用有機材料」 ぶんし ん出版社刊 ( 1 9 9 7 ) などに記載されている化合物など種々の公知の光酸発生 剤が使用できる。 この中で特に好ましくはジフエ二ルー 4—チオフエノキシフエ ニルスルフォニゥムへキサフルォロアンチモネ一トなどのスルホ二ゥム塩もしく はジフエ二ルョ一ドニゥム塩であり、 対イオンとしては P F 6 -、 S b F 6 _、 A s F 6—、 B ( C 6 F 5 ) 4 —などが好ましい。 Examples of photoacid generators that generate cations include compounds such as triarylsulfonium salts, diaryliodonium salts, and nitrobenzyl esters of sulfonic acids. Various known photoacid generators, such as the compounds described in "Materials" published by Bunshin Publishing Co., Ltd. (1997) can be used. Among them, particularly preferred is a sulfonium salt such as diphenyl 4-thiophenoxyphenylsulfonium hexafluoroantimonate or diphenyldonium salt, and a counter ion As PF 6- , S b F 6 _, A s F 6 —, B (C 6 F 5 ) 4 — and the like are preferred.
多官能重合性不飽和二重結合基含有モノマーあるいはオリゴマー、 ポリマーと 多官能開環重合性環状エーテル化合物とラジカルを発生させる光ラジカル開始剤 とカチオンを発生させる光酸発生剤とを混合して用いてもよいし、 単独でラジカ ルとカチオンの両方を発生させるような化合物の場合は単独で用いることができ る。 重合開始剤は、 多官能モノマー 1 0 0質量部に対して、 0 . 1ないし 1 5質 量部の範囲で使用することが好ましく、 1ないし 1 0質量部の範囲で使用するこ とがさらに好ましい。  Use a mixture of polyfunctional polymerizable unsaturated double bond group-containing monomer or oligomer, polymer, polyfunctional ring-opening polymerizable cyclic ether compound, photo-radical initiator that generates radicals, and photo-acid generator that generates cations Or a compound that generates both a radical and a cation by itself can be used alone. The polymerization initiator is preferably used in the range of 0.1 to 15 parts by mass, more preferably in the range of 1 to 10 parts by mass, based on 100 parts by mass of the polyfunctional monomer. preferable.
活性エネルギー線重合性樹脂の塗布液は、 メチルェチルケトン、 メチルイソブ チルケトンなどのケトン類、 エチルアルコール、 イソプロピルアルコールなどの アルコール類、 酢酸ェチルなどのエステル類などの有機溶剤に、 上記の多官能モ ノマーと重合開始剤を主体に溶解して作製する。 乾燥工程を略するためには無溶 剤にすることも可能である。  The coating solution of the active energy ray polymerizable resin may be mixed with an organic solvent such as ketones such as methyl ethyl ketone and methyl isobutyl ketone, alcohols such as ethyl alcohol and isopropyl alcohol, esters such as ethyl acetate, and the above polyfunctional monomer. It is prepared by dissolving a nomer and a polymerization initiator mainly. In order to omit the drying step, it is possible to use a non-solvent.
本発明のハードコ一トフィルムは、 基材フィルム上に活性エネルギー線重合性 樹脂塗料をデイツビング法、 スピナ一法、 スプレー法、 ロールコ一夕一法、 グラ ビア法、 ワイヤ一バー法、 ェクストル一ジョン法、 ブレード法、 ダイコート法な どの公知の薄膜形成方法で形成、 乾燥、 活性エネルギー線照射して作製すること ができる。  The hard coat film of the present invention is obtained by coating an active energy ray polymerizable resin paint on a base film by a dipping method, a spinner method, a spray method, a roll coat method, a gravure method, a wire bar method, or an extruder method. It can be formed by a known thin film forming method such as a blade method, a die coating method, and the like, dried, and irradiated with active energy rays.
さらに、 基材フィルムとのハードコート層の密着性を向上させる目的で、 所望 により片面又は両面に、 酸化法や凹凸化法などにより表面処理を施すことができ る。 上記酸化法としては、 例えばコロナ放電処理、 グロ一放電処理、 プラズマ処 理、 クロム酸処理 (湿式) 、 火炎処理、 熱風処理、 オゾン '紫外線照射処理など が挙げられる。 更に、 一層以上の下塗り層を設けることができる。 下塗り層の素 材としては塩ィ匕ビニル、 塩化ビニリデン、 ブタジエン、 (メタ) アクリル酸エス テル、 ビニルエステルなどの共重合体或いはラテックス、 低分子量ポリエステル、 ゼラチンなどの水溶性ポリマーなどが挙げられる。 下塗り層中に酸化錫、 I T O や酸化亜鉛などの金属酸化物やイオン性の有機化合物を導電性物質として添カロす ることもできる。  Further, for the purpose of improving the adhesion of the hard coat layer to the substrate film, one or both surfaces can be subjected to a surface treatment by an oxidation method, a roughening method, or the like, if desired. Examples of the oxidation method include a corona discharge treatment, a glow discharge treatment, a plasma treatment, a chromic acid treatment (wet method), a flame treatment, a hot air treatment, and an ozone irradiation with ultraviolet rays. Further, one or more undercoat layers can be provided. Examples of the material for the undercoat layer include copolymers or latexes such as vinyl chloride vinyl chloride, vinylidene chloride, butadiene, (meth) acrylate and vinyl ester, and water-soluble polymers such as low molecular weight polyester and gelatin. Metal oxides such as tin oxide, ITO and zinc oxide and ionic organic compounds can be added to the undercoat layer as a conductive substance.
ハードコート層は、 単層でも可能であるが、 2層以上の構成も可能である。 多 層構成のものは順次表面弾性率の異なる層を積層して作成することもできる。 多 層構成の場合、 層の弾性率や硬化収縮率、 I ZO値、 吸湿率はそれそれの層の特 性を厚みで補正した値として求めることができる。 The hard coat layer may be a single layer, but may be composed of two or more layers. Many The layered structure may be formed by sequentially laminating layers having different surface elastic moduli. In the case of a multi-layer structure, the elastic modulus, cure shrinkage, IZO value, and moisture absorption of each layer can be obtained as values obtained by correcting the characteristics of each layer with the thickness.
本発明においてハードコート層の上には、 反射防止層、 防眩層、 防汚性層など の機能性薄膜を設けることができる。 さらに、 紫外線や赤外線の吸収層、 選択波 長吸収層、 帯電防止層、 電磁波シールド層を積層して組み合わせることも可能で あり、 高硬度の機能性薄膜付きハードコートフィルムとして供される。  In the present invention, a functional thin film such as an antireflection layer, an antiglare layer, and an antifouling layer can be provided on the hard coat layer. Furthermore, it is also possible to laminate and combine an ultraviolet or infrared absorption layer, a selective wavelength absorption layer, an antistatic layer, and an electromagnetic wave shielding layer, and it is provided as a hard coat film with a highly functional thin film.
これらの機能性薄膜は、 公知の機能性材料の溶液を塗布する湿式法や、 スパッ タ一や蒸着などの真空成膜する乾式法により作成することができる。  These functional thin films can be formed by a wet method of applying a solution of a known functional material, or a dry method of forming a vacuum film such as a sputter or vapor deposition.
第 1図は、 本発明の一実施態様としてのハードコートフィルムについてその層 構成を示す模式図、 第 2図は、 本発明の一実施態様としての機能性薄膜付きハー ドコ一トフィルムについてその層構成を示す模式図である。 第 1図又は第 2図に おいて、 1は基材フィルム、 2はハードコート層、 3 aは高屈折率層、 3 bは低 屈折率層、 4は帯電防止性下塗り層を示す。  FIG. 1 is a schematic diagram showing the layer structure of a hard coat film as one embodiment of the present invention, and FIG. 2 is a layer structure of a hard coat film with a functional thin film as one embodiment of the present invention. FIG. In FIG. 1 or FIG. 2, 1 is a substrate film, 2 is a hard coat layer, 3a is a high refractive index layer, 3b is a low refractive index layer, and 4 is an antistatic undercoat layer.
これらのハードコートフィルムを積層した基材は、 優れた耐擦傷性、 表面硬度 を有する基材として好ましく用いられる。 このような基材として、 具体的には、 表面の傷つき防止のためハードコートフィルムを貼り付けたプラスチックシ一ト や、 飛散防止のためハ一ドコートフィルムを貼り付けたショウウィンドウ又は窓 ガラスの等を挙げることができる。  A substrate on which these hard coat films are laminated is preferably used as a substrate having excellent scratch resistance and surface hardness. Specific examples of such a base material include a plastic sheet to which a hard coat film is attached to prevent surface damage, and a show window or window glass to which a hard coat film is attached to prevent scattering. And the like.
ハードコートフィルムは粘着剤を積層し、 基材に貼り付けることができる。 ハ ードコートフィルムは基材の片面にのみ貼り付けても良いし、 基材の両面に貼り 付けても良い。  The hard coat film can be laminated with an adhesive and attached to a substrate. The hard coat film may be attached to only one side of the substrate, or may be attached to both sides of the substrate.
ハードコートフィルムを積層する基材としては、 ガラス又はプラスチヅクを用 いることができる。 ブラスチックの具体例として、 セルロースエステル、 ポリア ミド、 ポリカーボネート、 ポリエステル、 ポリスチレン、 ポリオレフイン、 ポリ スルホン、 ポリエ一テルスルホン、 ポリアリレート、 ポリエーテルイミ ド、 ポリ メチルメタクリレートおよびポリエーテルケトン等を挙げることができる。 基材は透明であることが好ましく、 基材の光透過率は、 4 0 0 ηπ!〜 7 8 0 η mの波長範囲において 8 0 %以上、 より好ましくは 9 0 %以上であることが好ま しい。 Glass or plastic can be used as a substrate on which the hard coat film is laminated. Specific examples of the plastic include cellulose esters, polyamides, polycarbonates, polyesters, polystyrenes, polyolefins, polysulfones, polyestersulfones, polyarylates, polyetherimides, polymethylmethacrylates and polyetherketones. The substrate is preferably transparent, and the light transmittance of the substrate is 400 ηπ! It is preferably at least 80%, more preferably at least 90% in a wavelength range of up to 780 m. New
また、 基材の厚さは 1〜30mmであることが好ましく、 基材はシート状、 ノ ネル状、 板状等のいずれの形状であっても良い。  Further, the thickness of the substrate is preferably 1 to 30 mm, and the substrate may be in any shape such as a sheet shape, a panel shape, and a plate shape.
本発明のハードコートフィルム又はこれを積層した基材を設けた画像表示装置 は、 優れた耐擦傷性、 表面硬度を有する画像表示装置として好ましく用いられる c ハードコ一トフィルム又はこれを積層した基材を設けた画像表示装置としては、 液晶表示装置 (LCD)、 プラズマディスプレイパネル (PDP)、 電界放射型 ディスプレイ (FED)やエレク トロルミネッセンスディスプレイ (ELD) な どの FPD (フラットパネルディスプレイ) や陰極管表示装置 (CRT)、 タヅ チパネルなどを挙げることができる。  The image display device provided with the hard coat film of the present invention or the substrate on which the laminated film is provided has excellent abrasion resistance, and is preferably used as an image display device having surface hardness. The image display devices provided include flat panel displays (FPDs) such as liquid crystal displays (LCDs), plasma display panels (PDPs), field emission displays (FEDs), electroluminescence displays (ELDs), and cathode ray tube displays. (CRT), touch panels, and the like.
第 3図は、 本発明の一実施態様としてのハ一ドコートフィルムを設けた画像表 示装置についてその断面を示す模式図、 第 4図は、 本発明の一実施態様としての ハ一ドコ一トフイルムを積層した基材を設けた画像表示装置についてその断面を 示す模式図である。 第 3図又は第 4図において、 Aは画像表示装置、 Bは基材、 Cはハードコートフィルム又は機能性薄膜付きハードコートフィルムを示す。 ハードコート層の表面弾性率と厚みの三乗の積を 3 OKP a - mm3以上 70FIG. 3 is a schematic view showing a cross section of an image display device provided with a hard coat film as one embodiment of the present invention, and FIG. 4 is a hard disk as one embodiment of the present invention. FIG. 3 is a schematic view showing a cross section of an image display device provided with a base material on which a tofilm is laminated. 3 or 4, A indicates an image display device, B indicates a substrate, and C indicates a hard coat film or a hard coat film with a functional thin film. The product of the surface elastic modulus of the hard coat layer and the cube of the thickness is 3 OKP a-mm 3 or more 70
OKPa - mm3以下の値にするという本発明により、 鉛筆硬度が高く、 表面に 傷がつき難いハードコートフィルムを得ることができる。 図面の簡単な説明 OKPa - the present invention that the mm 3 following values, high pencil hardness, it is possible to obtain a hard hard coat film scratch the surface. BRIEF DESCRIPTION OF THE FIGURES
第 1図は、 本発明のハードコートフィルムの一実施態様についてその層構成を 示す模式図である。  FIG. 1 is a schematic view showing the layer constitution of one embodiment of the hard coat film of the present invention.
第 2図は、 本発明の機能性薄膜付きハードコートフィルムの一実施態様につい てその層構成を示す模式図である。  FIG. 2 is a schematic diagram showing a layer configuration of one embodiment of the hard coat film with a functional thin film of the present invention.
第 3図は、 本発明のハードコートフィルム又は機能性薄膜付きハードコートフ イルムを設けた画像表示装置についてその断面を示す模式図である。  FIG. 3 is a schematic view showing a cross section of an image display device provided with a hard coat film or a hard coat film with a functional thin film of the present invention.
第 4図は、 本発明のハ一ドコートフィルム又は機能性薄膜付きハードコートフ イルムを積層した基材を設けた画像表示装置についてその断面を示す模式図であ る。 実施例 FIG. 4 is a schematic view showing a cross section of an image display device provided with a substrate on which a hard coat film or a hard coat film with a functional thin film of the present invention is laminated. Example
以下に実施例を挙げて本発明をさらに説明するが、 本発明はこれに限定される ものではない。  Hereinafter, the present invention will be further described with reference to Examples, but the present invention is not limited thereto.
(ハードコートフィルムの作成)  (Preparation of hard coat film)
表 1に記載の硬化性樹脂をメチルェチルケトン (MEK) に溶解し、 重合開始 剤を添加し、 孔径 1 zmのポリプロピレン製フィルターで濾過して硬化性糸且成物 を調製した。  The curable resin described in Table 1 was dissolved in methyl ethyl ketone (MEK), a polymerization initiator was added, and the mixture was filtered through a polypropylene filter having a pore size of 1 zm to prepare a curable yarn.
予めコロナ処理した、 ガラス転移温度 37°Cのスチレンブタジエンコポリマ一 からなるラテックス (LX407 C 5 ; 日本ゼオン (株) 製) と酸化錫■酸ィ匕ァ ンチモン複合酸化物 (FS— 10D;石原産業 (株) 製) を質量で 5 : 5の割合 で混合し、 乾燥後の膜厚が 0. 2 mになるように塗布することにより、 帯電防 止性下塗り層を形成した厚さ 175〃 mの PETフィルム (2軸延伸ポリエステ ルテレフタレ一トフイルム) および 80 zmのトリァセチルセルロースフィルム を別途作製した。  Latex made of styrene butadiene copolymer having a glass transition temperature of 37 ° C (LX407C5; manufactured by Nippon Zeon Co., Ltd.) previously treated with corona and a tin oxide-acid-antimony complex oxide (FS-10D; Ishihara (Manufactured by Co., Ltd.) in a ratio of 5: 5 by mass, and applied so that the film thickness after drying becomes 0.2 m, so that the antistatic undercoat layer is formed to a thickness of 175 mm. A PET film (biaxially stretched polyester terephthalate film) and an 80 zm triacetyl cellulose film were separately manufactured.
この帯電防止を施した 2種のフィルム上に、 ェクストル一ジョン方式で所定の 厚さになるように硬ィ匕性組成物を塗布した (厚さは硬化性組成物の溶解濃度と塗 布量で調整した。 ) 。 100°Cで硬化性組成物を乾燥した後、 75 OmJ/cm 2 の照度の紫外線を照射し、 ハードコート層を形成したハードコートフィルム ( 試料番号に tを付したものはトリアセチルセルロースに塗布したもの) を作成し た。 開始剤は、 ラジカル重合性硬化組成物の場合は、 ィルガキュア 184 (チバ ガイギ一社製) を、 カチオン重合性組成物の場合は、 口一ドシル 2074 (ロー ディア社製) を、 両者の混合の場合はそれそれの開始剤を混合して用いた。 添カロ 量は硬化性樹脂に対し 4質量%であった。 The dangling composition was applied on the two antistatic films by an extrusion method so as to have a predetermined thickness (the thickness was determined by the dissolution concentration of the curable composition and the coating amount). Adjusted with.) After drying the curable composition at 100 ° C, irradiate ultraviolet rays with illuminance of 75 OmJ / cm 2 to form a hard coat film with a hard coat layer (samples with t added to triacetyl cellulose) Was created. For the radically polymerizable curable composition, irgacure 184 (manufactured by Ciba Geigy Co., Ltd.) is used, and for the cationically polymerizable composition, liposome dosyl 2074 (manufactured by Rhodia) is used. In each case, the respective initiators were mixed and used. The calorie content was 4% by mass based on the curable resin.
表中のポリグリシジルメ夕クリレート * は MEK中にグリシジルメタクリレ一 トを溶角军させ、 開始剤を滴下しながら 80°Cで 2時間反応させ、 得られた反応溶 液をへキサンに滴下し、 沈殿物を減圧乾燥して得た。 なお、 分子量は 15, 00 0である。  For polyglycidyl methacrylate * in the table, glycidyl methacrylate is dissolved in MEK and reacted at 80 ° C for 2 hours while the initiator is added dropwise.The obtained reaction solution is added dropwise to hexane Then, the precipitate was obtained by drying under reduced pressure. The molecular weight is 15,000.
なお、 アルミナ分散物 * * は、 メチルイソプチルケトン 234部、 ァロニヅク ス M— 5 3 0 0 (カルボン酸基含有メタクリレート;東亞合成 (株) 製) 3 6部、 微粒子アルミナ (AK P— G O 1 5 ;住友化学工業 (株) 製) 1 8 0部の混合物 を、 1 πιπιΦのジルコ二アビ一ズをメディアに用いて、 セラミックコートしたサ ンドミルで分散し、 表面処理したアルミナ微粒子分散物であり、 表中の質量は固 形分の質量である。 The alumina dispersion ** is 234 parts of methyl isobutyl ketone, A mixture of 36 parts of M-530 (methacrylate containing a carboxylic acid group; manufactured by Toagosei Co., Ltd.) and 180 parts of fine-particle alumina (AKP-GO15; manufactured by Sumitomo Chemical Co., Ltd.) This is a dispersion of alumina fine particles that has been surface-treated by dispersing with a ceramic-coated sand mill using zirconium aviation of 1πιπιΦ as the medium. The mass in the table is the mass of the solid component.
(ハードコートフィルムの特性)  (Characteristics of hard coat film)
作製したハードコートフィルムそれそれのハードコート層の表面弾性率と厚み の三乗の積、 表面弾性率、 厚み、 硬化組成物の硬化収縮率、 P E T又はトリァセ チルセルロースを基材フィルムとしたときのハ一ドコートフィルムの鉛筆硬度、 カール値及び割れ性等を表 1に示す。 The product of the surface elastic modulus and the thickness of the hard coat layer, the product of the surface elastic modulus and the thickness of the hard coat layer, the surface elastic modulus, the thickness, the curing shrinkage of the cured composition, when PET or triacetyl cellulose is used as the base film. Table 1 shows the pencil hardness, curl value, cracking property, etc. of the hard coat film.
Figure imgf000024_0001
Figure imgf000024_0001
硬化性樹脂 表面 ¾性率 厚み3 表面弾性率 腠厚 硬化収縮率 カール値 シャープペン 割れ性 試料番号 鉛筆硬度 Curable resin surface ¾ modulus of elasticity thickness 3 surface elastic modulus 腠 thickness curing shrinkage curl value mechanical pencil sharpness sample number pencil hardness
(混合質量比) KPa- mm" GPa m 体積% 1 /m 引接き mm (Mixing mass ratio) KPa-mm "GPa m Volume% 1 / m
1t 比較例 7 H 6.8 10 5以下 200g 30以下1t Comparative Example 7 H 6.8 10 5 or less 200g 30 or less
2t 本発明 ジペンタエリスリト一ルへキサァクリレート 184 4H 6.8 30 20 300g以上 80 2t invention dipentaerythritol hexaacrylate 184 4H 6.8 30 20 300 g or more 80
21  twenty one
3t 本発明 (日本化薬㈱製) 662 4H 6.8 46 30 120 3t The present invention (Nippon Kayaku Co., Ltd.) 662 4H 6.8 46 30 120
4t 比較例 850 4H 6.8 50 45 1504t Comparative example 850 4H 6.8 50 45 150
13t 比較例 23 H 6.8 15 5以下 250g 30以下13t Comparative Example 23 H 6.8 15 5 or less 250g 30 or less
14t 本発明 1 290K (ウレタンァクリレート; 244 4H 6.8 33 5以下 300g以上 30以下 14t Invention 1 290K (urethane acrylate; 244 4H 6.8 33 5 or less 300g or more and 30 or less
10  Ten
15t 本発明 ダイセル化学工業㈱製) 579 4H 6.8 44 10 30以下 15t Invention Daicel Chemical Industries, Ltd.) 579 4H 6.8 44 10 30 or less
16t 比較例 850 4H 6.8 50 15 30以下 16t Comparative example 850 4H 6.8 50 15 30 or less
表 1から、 ハードコ一ト層の表面弾性率とハードコート層厚みの三乗の積を 3 0 KP a · mm3 以上 70 OKPa · mm3 以下とすることにより、 4 H以上の 鉛筆硬度のハードコートフィルムを得ることができることがわかる。 From Table 1, by setting the cube of the product of the surface elastic modulus and the hard coat layer thickness of hard coat one coat layer 3 0 KP a · mm 3 or more 70 OKPa · mm 3 or less, the 4 H above pencil hardness Hard It can be seen that a coated film can be obtained.
さらに好ましくは、 硬化後の体積収縮率が 15%以下のハードコート素材を用 いることにより、 ハ一ドコ一トフイルムのカールが小さいものを得ることができ る。  More preferably, a hard coat material having a small curl can be obtained by using a hard coat material having a volume shrinkage of 15% or less after curing.
ハードコート層の表面弾性率が 9 GP a以上になると、 硬化収縮率は小さくて も脆性が著しく悪化しハードコ一ト層が割れやすくなる場合がある。  If the surface elastic modulus of the hard coat layer is 9 GPa or more, the brittleness is remarkably deteriorated even if the curing shrinkage is small, and the hard coat layer may be easily broken.
また、 作製したハードコート層の表面弾性率と厚みの三乗の積、 表面弾性率、 厚み、 硬化組成物の硬化収縮率、 I/O値、 PETを基材フィルムとしたときの ハードコ一トフィルムの鉛筆硬度、 カール値および割れ性等を表 2に示す。 In addition, the product of the cube of the surface elastic modulus and the thickness of the prepared hard coat layer, the surface elastic modulus, the thickness, the cure shrinkage of the cured composition, the I / O value, and the hard coat film when PET is used as the base film Table 2 shows the pencil hardness, curl value, cracking property, and the like.
t t
Figure imgf000027_0001
Figure imgf000027_0001
表 2に示した結果から、 表面弾性率と膜厚の 3乗との積が大きく、 かつ硬化性 組成物の硬化後の体積収縮が 15体積%以下、 I/O値が 0. 85以下とするこ とにより鉛筆硬度、 カール、 割れ性および吸湿量低下の目標を達成でき、 吸湿に よるハードコート層の膨張収縮を小さくすることができる。 From the results shown in Table 2, the product of the surface elastic modulus and the cube of the film thickness is large, and the volume shrinkage of the curable composition after curing is 15% by volume or less and the I / O value is 0.85 or less. By doing so, it is possible to achieve the targets of pencil hardness, curl, breakability, and decrease in moisture absorption, and it is possible to reduce expansion and contraction of the hard coat layer due to moisture absorption.
(防汚性反射防止層の形成)  (Formation of antifouling antireflection layer)
( 1 ) 高屈折率層塗布液 ( a— 1 ) の調製  (1) Preparation of coating solution for high refractive index layer (a-1)
二酸化チタン微粒子 (TTO—55B、 石原産業 (株) 製) 30. 0質量部、 ァニオン性モノマー (M— 5300、 東亞合成 (株) 製) 4. 5質量部およびシ クロへキサノン 65. 2質量部を、 サンドグラインダーミルにより分散し、 質量 平均径 55 nmの二酸化チタン分散液を調製した。 前記二酸化チタン分散物とジ ペン夕エリスリ トールへキサァクリレート (DPHA、 日本化薬 (株) 製) 、 光 重合開始剤 (ィルガキュア 907、 チバガイギ一社製) 、 光増感剤 (カャキュア —DETX、 日本化薬 (株) 製) とを、 モノマーの合計量 (ジペン夕エリスリ ト 一ルへキサァクリレート、 ァニオン性モノマーの合計量) と二酸化チタンとの体 積比が 60/40、 光重合開始剤と光増感剤との質量比が 3/1、 そして、 光重 合開始剤と光増感剤の合計量とモノマーの合計量との質量比が 6/100になる ようにメチルェチルケトンに添加 ·混合し、 高屈折率層塗布液を調整した。 屈折 率は 1. 80であった。  Titanium dioxide fine particles (TTO-55B, manufactured by Ishihara Sangyo Co., Ltd.) 30.0 parts by mass, anionic monomer (M-5300, manufactured by Toagosei Co., Ltd.) 4.5 parts by mass and cyclohexanone 65.2 mass The parts were dispersed by a sand grinder mill to prepare a titanium dioxide dispersion having a mass average diameter of 55 nm. The titanium dioxide dispersion and dipentyl erythritol hexaacrylate (DPHA, manufactured by Nippon Kayaku Co., Ltd.), a photopolymerization initiator (Irgacure 907, manufactured by Ciba Geigy Co., Ltd.), a photosensitizer (Kayacure-DETX, Nippon Kagaku) The total volume of monomers (total amount of dipentyl erythritol hexylacrylate and anionic monomer) and titanium dioxide is 60/40, the photopolymerization initiator and photosensitizer To the methyl ethyl ketone so that the mass ratio with the sensitizer is 3/1, and the mass ratio of the total amount of the photopolymerization initiator and the photosensitizer to the total amount of the monomers is 6/100 The mixture was mixed to prepare a high refractive index layer coating solution. The refractive index was 1.80.
( 2 ) 低屈折率層塗布液 ( a— 2 ) の調製  (2) Preparation of low refractive index layer coating solution (a-2)
ペン夕エリスリト一ルテトラァクリレート (PETA、 日本化薬 (株) 製) 6 g、 光重合開始剤 (ィルガキュア 184、 チバガイギ一社製) 0. 5g、 0. 2 g、 メガファック 531 A (C8 F17 S02 N (C3 H7 ) CH2 CH2 OCO CH = CH2 、 大日本インキ化学工業 (株) 製) 0. 9g、 およびメチルェチル ケトン 200 gを混合、 攪拌して、 屈折率は 1. 52の低屈折率層の塗布液を調 製した。 Penyu erythritol tetraacrylate (PETA, manufactured by Nippon Kayaku Co., Ltd.) 6 g, photopolymerization initiator (Irgacure 184, manufactured by Ciba-Geigy) 0.5 g, 0.2 g, Megafac 531 A ( C 8 F 17 S0 2 N (C 3 H 7 ) CH 2 CH 2 OCO CH = CH 2 0.9 g, manufactured by Dainippon Ink and Chemicals, Inc.) and 200 g of methylethyl ketone are mixed, stirred, and refracted. A coating liquid for a low refractive index layer having a refractive index of 1.52 was prepared.
( 3 ) 防汚性反射防止層付きハードコートフィルムの形成  (3) Formation of hard coat film with antifouling antireflection layer
実施例 43のハードコートフィルムに、 ( a— 1 ) の高屈折率層塗布液を、 ヮ ィャ一バーを用いて乾燥膜厚が 9 Onmになるように塗布、 乾燥、 紫外線照射し、 さらに、 高屈折率層の上に (a— 2)の低屈折率層塗布液を乾燥膜厚が 85 nm になるように塗布、 乾燥、 紫外線照射し反射防止層を形成した防汚性反射防止層 付きハードコートフィルムを得た。 このフィルムにアクリル系粘着剤をつけ、 電 磁波シールド層、 近赤外線吸収層および選択吸収フィルターを具備したブラズマ ディスプレイ前面板に積層した。 表面の特性を調べた結果を表 3に示す。 The coating liquid of the high refractive index layer (a-1) was applied to the hard coat film of Example 43 using a bar so as to have a dry film thickness of 9 Onm, dried, and irradiated with ultraviolet rays. The low-refractive-index layer coating solution of (a-2) is dried on the high-refractive-index layer to a thickness of 85 nm. Thus, a hard coat film with an antifouling antireflection layer having an antireflection layer formed by applying, drying, and irradiating ultraviolet rays was obtained. An acrylic pressure-sensitive adhesive was applied to this film, and the film was laminated on a plasma display front plate provided with an electromagnetic wave shielding layer, a near-infrared absorbing layer, and a selective absorption filter. Table 3 shows the results of examining the surface characteristics.
PETフィルムに直接 (a— 1)及び (a— 2) を塗設したものを同様に作成、 積層した。 表面の特性を調べた結果を表 3に示す。 表 3  PET films with (a-1) and (a-2) applied directly were similarly prepared and laminated. Table 3 shows the results of examining the surface characteristics. Table 3
Figure imgf000029_0001
Figure imgf000029_0001
表 3から、 本発明のハードコ一トフィルムに防汚性反射防止層を積層すること により、 防汚性及び反射防止機能を兼備する機能性薄膜付きハ一ドコートフィル ムを得ることができる。 From Table 3, it is possible to obtain a hard coat film with a functional thin film having both an antifouling property and an antireflection function by laminating an antifouling antireflection layer on the hard coat film of the present invention.
( 4 ) 防汚性反射防止層付きハードコ一トフイルムを取り付けた画像表示装置 実施例 44又は 46のフィルムのハードコート層又は防汚性反射防止層を設け ていない面にアクリル系粘着剤をつけ、 PDP : (株) 日立製作所製 42型ブラ ズマディスプレイ (CMP412 IHD J) の前面パネル (導電性層、 選択吸収 フィル夕一層、 近赤外吸収層が具備されたパネル) のガラス表面および任天堂 ( 株) 製ゲームボーイの画像表示部のプラスチック表面に貼り付け、 画像の見易さ、 汚れの拭取り易さ、 耐傷性等を調べた。 その結果を表 4に示す。 表 4 (4) An image display device equipped with a hard coat film having an antifouling antireflection layer An acrylic adhesive is applied to the surface of the film of Example 44 or 46 where the hardcoat layer or the antifouling antireflection layer is not provided, PDP: Glass surface of the front panel (panel with conductive layer, selective absorption filter, and near-infrared absorption layer) of 42-inch plasma display (CMP412 IHD J) manufactured by Hitachi, Ltd. and Nintendo Co., Ltd. The product was attached to the plastic surface of the image display area of a Game Boy manufactured, and the images were checked for ease of viewing, dirt wiping, and scratch resistance. The results are shown in Table 4. Table 4
Figure imgf000030_0001
Figure imgf000030_0001
表 4から、 本発明のハードコートフィルムを設けた画像表示装置は、 表面の硬 度が大きく傷つき難く、 かつ画像の視認性に優れることが解る。 Table 4 shows that the image display device provided with the hard coat film of the present invention has a large surface hardness, is hardly damaged, and has excellent image visibility.
それそれの評価方法は、 以下の方法で行った。  Each evaluation method was performed by the following method.
表面弾^ έ率:微小表面硬度計 ( (株) フィッシャー ·ィンスヅルメンッ社製: フィッシャースコープ Η 100 VP— HCU) を用いて、 ダイヤモンド製の四角 錐圧子 (先端対面角度; 136° ) を使用し、 押し込み深さが l〃mを超えない 範囲で、 適当な試験荷重下での押し込み深さを測定し、 除荷重時の荷重と変位の 変化から求められる弾性率である。  Surface elasticity ratio: Using a diamond surface pyramid indenter (tip-to-face angle: 136 °) using a micro-surface hardness tester (Fisher ヅ slmenment Co., Ltd .: Fischer Scope 100 VP—HCU). It is the elastic modulus obtained by measuring the indentation depth under an appropriate test load within the range where the indentation depth does not exceed l〃m, and calculating the change in load and displacement when the load is removed.
硬ィ匕組成物の硬ィ匕収縮率:既に述べた方法による。  Hardening shrinkage rate of hardening composition: According to the method already described.
鉛筆硬度試験:鉛筆引つ接き試験の硬度は、 作製したハードコートフィルムを 温度 25。 相対湿度 60 %の条件で 5時間調湿した後、 JIS S 6006が 規定する試験用鉛筆を用いて、 J I S K 5400が規定する鉛筆硬度評価方法 に従い、 9. 8 Nの荷重にて傷 '凹みが認められない鉛筆の硬度の値である。 シャープペン引搔き:フィルムを温度 25°C、 相対湿度 60%の条件で 5時間 調湿した後、 HE I DON表面性試験機 N— 14 (新東科学 (株) 製) において、 45° に傾けたシャープペン先 (PD 355、 べんてる (株) 製) の金属部先端 に荷重を変化させながら擦り、 傷が発生する時の荷重を調べた。  Pencil hardness test: The hardness of the pencil pull test is 25 for the prepared hard coat film. After conditioning for 5 hours under the condition of 60% relative humidity, using a test pencil specified by JIS S 6006, in accordance with the pencil hardness evaluation method specified by JISK 5400, the scratches and dents were formed under a load of 9.8 N. This is a pencil hardness value that is not recognized. Mechanical pencil drawing: After conditioning the film for 5 hours at a temperature of 25 ° C and a relative humidity of 60%, use a HE I DON surface tester N-14 (manufactured by Shinto Kagaku Co., Ltd.). The tip of a metal tip of a mechanical pencil (PD 355, manufactured by Bentel) was rubbed while varying the load, and the load when scratches were generated was examined.
カール値: J I S K7619— 1988の 「写真フィルムのカールの測定法 」 の方法 Aのカール測定用型板を用いて測定した値である。 60%カールの試験 条件は 25° 相対湿度 60%である。 本発明で言うカールがプラスとは、 フィ ルムのハードコート層塗設側が湾曲の内側になるカールを言い、 マイナスとは塗 設側が湾曲の外側になるカールを言う。 値が大きいほどカールが著しい。 Curl value: It is a value measured using the curl measurement template of method A of "Method for measuring curl of photographic film" in JIS K7619-1988. The test condition for 60% curl is 25 ° relative humidity 60%. In the present invention, curl is positive, The curl where the coated side of the hard coat layer of LUM is inside the curve is defined as negative, and the curl where the coated side is outside the curve is defined as negative. The larger the value, the more the curl is significant.
カール湿度差: 2 5 °Cで相対湿度 8 0 %と 1 0 %のカールの値を読みとり、 両 力一ル値の差の絶対値で示した。  Curl humidity difference: The curl values were read at 80% and 10% relative humidity at 25 ° C and expressed as the absolute value of the difference between the two values.
割れ性: 3 5 mm幅のハードコートフィルムを 2 5 °C 6 0 %R Hの雰囲気で 5 時間放置した後、 ハードコート層を外側にして丸め、 ハードコート層にヒビ割れ が発生するときの卷きの直径を求めた。  Crackability: After leaving a hard coat film of 35 mm width in an atmosphere of 25 ° C and 60% RH for 5 hours, the hard coat layer is rolled with the hard coat layer on the outside and rolled when cracks occur in the hard coat layer. The diameter of the wood was determined.
硬化組成物の I /O値:既に述べた方法による。  I / O value of the cured composition: according to the method already described.
吸湿量:露点一 4 0 °Cの乾燥雰囲気中に 2時間放置して乾燥後、 2 5 °C 6 0 % に 3時間放置し、 放置前後の重量変化から吸湿量を求めた。  Moisture absorption: After drying for 2 hours in a dry atmosphere at a dew point of 40 ° C, the sample was left at 60 ° C at 25 ° C for 3 hours, and the moisture absorption was determined from the weight change before and after the storage.
表面反射率:分光光度計 (日本分光 (株) 製) を用いて、 4 5 0〜6 5 0 nm の波長領域における入射光 5 ° における正反射の表面反射率を求めた。  Surface reflectance: Using a spectrophotometer (manufactured by JASCO Corporation), the surface reflectance of specular reflection at an incident light of 5 ° in a wavelength range of 450 to 65 nm was determined.
消しゴム擦り :ライオン (株) 製消しゴム N o . 5 0を用いて l k gの荷重で、 表面を 5 0往復させ、 表面の損傷を目視で評価した。 傷の発生、 変化が認められ ないものを〇とした。  Eraser rubbing: The surface was reciprocated 50 times with a load of lkg using an eraser No. 50 manufactured by Lion Corporation, and the surface damage was visually evaluated. If no scratching or change was observed, it was marked as 〇.
防汚性:フィルム表面に書いた速乾性油性ィンキ (ゼブラ製、 「マヅキー」 ( 登録商標) ) を東レ (株) 製「トレシ一」 (登録商標) を用いて数回擦ってふき 取った状態の評価 (〇は書いた跡が完全にふき取れた状態、 △は一部が拭き取れ ずに残った状態、 Xは大部分がふき残った状態) 。  Antifouling: A quick-drying oil-based ink (Zebra, “Maduki” (registered trademark)) written on the film surface was rubbed several times with “Toray Shi” (registered trademark) manufactured by Toray Industries, Inc. (〇 indicates a state where the written mark has been completely wiped off, Δ indicates a state where a part has not been wiped off, and X indicates a state where most of the trace has been wiped off).
画面の見易さ:蛍光灯の写り込みが見え易さを目視で評価した (〇は写り込み が見え難いもの、 Xは写り込みがはっきり見えるもの、 △は中間のもの) 。  Screen visibility: The visibility of the reflection of the fluorescent light was evaluated visually (〇 indicates that the reflection is difficult to see, X indicates that the reflection is clearly visible, and Δ indicates the middle).
指紋拭取り性:表面についた指紋を東レ (株) 製「卜レシ一」 (登録商標) を 用いて拭取った時の取れ易さを評価した (〇は軽い力で数回でとれるもの、 Xは 力をこめて擦って取れるもの、 △は中間のもの) 。  Fingerprint wiping property: Evaluated the ease with which fingerprints on the surface could be wiped off using Toray Co., Ltd.'s "Treshi-1" (registered trademark). X is the one that can be rubbed with force, Δ is the middle one).
耐傷性: # 0 0 0 0のスチールウールを用いて、 ハ一ドコ一トフイルムの表面 を 1 . 9 6 N/ c m2 の荷重で、 表面を擦ってわずかに目視で見える傷が発生す る回数を観察した。 Scratch resistance: The number of times a slight visual scratch occurs when the surface of a hard-coated film is rubbed with a load of 1.96 N / cm 2 using # 1000 steel wool. Was observed.

Claims

請 求 の 範 囲 The scope of the claims
1. 基材フィルムの少なくとも片面にハードコート層を積層してなるハ一ドコ1. A hard disk having a hard coat layer laminated on at least one side of a base film
—トフイルムであって、 該ハ一ドコート層の表面弾性率とハードコ一ト層厚みの 三乗の積が 3 OKPa · mm3 以上 70 OKPa · mm3以下であることを特徴 とするハードコートフィルム。 —A hard coat film, characterized in that the product of the surface elastic modulus of the hard coat layer and the cube of the thickness of the hard coat layer is 3 OKPa · mm 3 or more and 70 OKPa · mm 3 or less.
2. 該ハードコート層の表面弾性率が 4. OGPa以上 9. OGPa以下であ る請求項 1に記載のハードコートフィルム。  2. The hard coat film according to claim 1, wherein the surface elastic modulus of the hard coat layer is from 4. OGPa to 9. OGPa.
3. 該ハ一ドコ一ト層が、 活性エネルギ一線の照射により硬化された硬化性組 成物を主体とする層であり、 該硬化性組成物の硬化後の体積収縮率が、 0〜15 %である請求項 1又は 2に記載のハードコートフィルム。  3. The hard coat layer is a layer mainly composed of a curable composition cured by irradiation with active energy rays, and has a volume shrinkage of 0 to 15 after curing of the curable composition. 3. The hard coat film according to claim 1, wherein the content of the hard coat film is 0.1%.
4. 該ハ一ドコ一ト層が、 活性エネルギー線の照射により硬化された硬化性組 成物を主体とする層であり、 該硬化性組成物の硬化後の IZ〇値が 0. 1〜0. 85である請求項 1ないし 3いずれか 1つに記載のハードコートフィルム。  4. The hard coat layer is a layer mainly composed of a curable composition cured by irradiation with active energy rays, and the curable composition has an IZ〇 value of 0.1 to after curing. The hard coat film according to any one of claims 1 to 3, wherein the hard coat film has a ratio of 0.85.
5. 25°C60%RHにおけるハードコートフィルムの力一ル値 (カール値- 1/R (I ま曲率半径 (m) ) がマイナス 15からプラス 15の範囲にある請求 項 1ないし 4いずれか 1つに記載のハードコートフィルム。  5. The force value (curl value-1 / R (I radius of curvature (m))) of the hard coat film at 25 ° C and 60% RH is in the range of -15 to +15. A hard coat film according to any one of the above.
6. 25°C80%RHと25°C10%RHにおけるカール値の差の絶対値が 2 4以下である請求項 1ないし 5いずれか 1つに記載のハードコートフィルム。 6. The hard coat film according to any one of claims 1 to 5, wherein the absolute value of the difference between the curl values at 25 ° C 80% RH and 25 ° C 10% RH is 24 or less.
7. ハードコート層上に、 反射防止又は防汚機能を有する機能性薄膜を積層し た請求項 1ないし 6いずれか 1つに記載の機能性薄膜付きハードコートフィルム c 7. The hard coat film c with a functional thin film according to any one of claims 1 to 6, wherein a functional thin film having an antireflection or antifouling function is laminated on the hard coat layer.
8. 請求項 1ないし 7いずれか 1つに記載のハードコートフィルムを積層した 8. The hard coat film according to any one of claims 1 to 7 is laminated
9. 請求項 1ないし 7いずれか 1つに記載のハ一ドコートフィルム又は請求項 8に記載の基材を設けた画像表示装置。 9. An image display device provided with the hard coat film according to any one of claims 1 to 7 or the base material according to claim 8.
PCT/JP2002/004364 2001-09-25 2002-05-01 Hard coat film, base on which hard coat film is formed, image display having them WO2003026881A1 (en)

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CN1558824A (en) 2004-12-29
TWI225159B (en) 2004-12-11

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