TWI421530B - Hard coat film - Google Patents

Description

Hard coating

The present invention relates to a hard coat film, and more particularly to a hard coat film which has a sufficient surface hardness as a surface protective film of various image display devices and which has a small curl due to curing shrinkage.

At present, the hard coat film is used for various image display devices such as an LCD (Liquid Crystal Display), a touch panel, a CRT (Cathode Ray Tube), a PDP (electricity) for the purpose of anti-glare and anti-reflection properties represented by surface protection. Pulp display panel), EL (calling light-emitting element), etc. Moreover, it is also used in LCDs to protect polarizing plates. The hard coat film usually has a hard coat layer formed of heat curing, active energy ray curing or the like on a base film.

On the other hand, in recent years, the image display device has been required to be thinned. In this case, it is desirable that the hard coat layer can use a base film having a thickness of about half of the conventional thickness (about 80 to 125 μm). However, if the conventional hard coat layer is formed on the thin substrate film, curling occurs in the hard coat film due to curing shrinkage of the hard coat layer, resulting in difficulty in use as a surface protective film. Waiting for an inappropriate question.

Therefore, in order to suppress the occurrence of curling by suppressing the curing shrinkage, it is also disclosed that the curable composition is applied onto a substrate to be cured, and the hard coat layer after curing has a film thickness of 15 μm or more and 200 μm or less. The curable composition includes a compound having three or more ethylenically unsaturated groups and one or more isomeric cyanate rings in the same molecule (for example, see Patent Document 1). However, in this case, in order to obtain sufficient hardness, There is also a problem that the thickness of the hard coat layer must be set large.

Further, a technique of curing a composition comprising an isomeric cyanurate derivative containing two ethylenically unsaturated groups and pentaerythritol acrylate to form a hard coat layer is disclosed (for example, refer to Patent Document 2). However, in this technique, since the hardness of the cured product of the above-mentioned isocyanurate derivative monomer is insufficient, there is still room for further improvement in the hardness of the hard coat layer formed by curing the composition.

Patent Document 1: Japanese Laid-Open Patent Publication No. 2004-141732

Patent Document 2: Japanese Laid-Open Patent Publication No. 2005-103973

The present invention has been made in view of these problems, and an object thereof is to provide a hard coat film having a small curl which is necessary for a surface protective film of various image display devices and which has sufficient surface hardness and which is caused by curing shrinkage.

The present inventors have repeatedly studied in order to develop a hard coat film having the above-described good properties, and as a result, found that active energy ray-curable compounds and active energy ray-curable isomeric cyanurates are contained in a specified ratio using respective specific structures. The hard coat layer forming material of the derivative is obtained by providing a hard coat layer formed of an active energy ray-curable resin layer on a base film, and the object of the present invention is obtained. Based on this knowledge, the present invention has been completed.

That is, the present invention provides: (1) a hard coat film characterized by having a hard coat layer formed using an active energy ray-curable resin layer formed on a base film of a hard coat forming material, and the hard coat layer The forming material contains (A) an active energy ray-curable compound having three or more ethylenically unsaturated groups in the molecule and other than the isocyanurate derivative, and (B) in-molecular relative to 100 parts by mass thereof. have The active energy ray-curable isomeric cyanurate derivative of three or more ethylenically unsaturated groups is 150 to 550 parts by mass.

(2) The hard coat film according to the above (1), wherein the isocyanurate derivative of the component (B) has a structure in which all three nitrogen atoms of the iso-cyanuric acid skeleton are bonded to an ethylenically unsaturated group. .

(3) The hard coat film according to the above (1) or (2), wherein the height of the curl of the four corners generated when the hard coat film having a square shape of 10 cm is mounted on the flat plate is 100 mm or less in total, and The pencil hardness is 2H or more.

(4) The hard coat film according to any one of the above aspects, wherein the base film is a triethylenesulfonated cellulose film having a thickness of 80 μm or less.

(5) The hard coat film according to any one of (1) to (4), wherein the hard coat layer has a thickness of 3 to 10 μm.

According to the present invention, it is possible to provide a hard coat film having a small surface hardness which is necessary for a surface protective film of various image display devices, and which is small in curl and which is caused by curing shrinkage.

The hard coat film of the present invention is a hard coat layer having an active energy ray-curable resin layer formed using a hard coat layer forming material on a base film, and the hard coat layer forming material contains (A) isomeric cyanurate An active energy ray-curable compound other than the derivative, and (B) an active energy ray-curable isomeric cyanurate derivative.

The base film used in the hard coat film of the present invention is not particularly limited, and can be appropriately selected from the plastic film known as the base material of the conventional optical hard coat film. As such a plastic film, an example can be cited For example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate and other polyester films, polyethylene film, polypropylene film, cellophane, diethyl cellulose film, triethylene glycol cellulose Film, acetonitrile cellulose butyrate film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene-vinyl acetate film, polystyrene film, polycarbonate film, polymethyl Pentene film, polyfluorene film, polyetheretherketone film, polyether fluorene film, polyether quinone film, polyimine film, fluororesin film, polyamide film, acrylic film, norbornene resin Film, cycloolefin resin film, and the like.

These base film may be transparent or translucent, and may or may not be colored, and may be appropriately selected depending on the use. For example, in the case of a polarizing plate for protecting a liquid crystal display, a colorless transparent triacetyl cellulose film is suitable.

The thickness of the base film is not particularly limited, and may be appropriately selected depending on the case. However, from the viewpoint of effectively exhibiting the effect of suppressing the occurrence of curl, it is preferably 80 μm or less, more preferably 20 to 80 μm. Moreover, for the purpose of improving the adhesion of the layer provided on the surface of the base film, the base film may be subjected to surface treatment on one or both sides by an oxidation method, a roughening method, or the like as needed. The above oxidation method may, for example, be corona discharge treatment, plasma treatment, chromic acid treatment (wet), flame treatment, hot air treatment, ozone. For example, a blasting method, a solvent treatment method, etc. are mentioned. These surface treatment methods can be appropriately selected depending on the type of the base film, but it is preferable to use a corona discharge treatment method from the viewpoints of effects and workability.

In the hard coat film of the present invention, the hard coat layer laminated on the base film includes (A) having three or more ethylenically unsaturated groups in the molecule, and is other than the isomeric cyanurate derivative. The active energy ray-curable compound and (B) a hard coat layer forming material of an active energy ray-curable isomeric cyanurate derivative having three or more ethylenically unsaturated groups in the molecule.

In addition, the active energy ray-curable compound in the component (A) is a compound having an energy source in an electromagnetic wave or a charged particle beam, that is, a compound which is crosslinked and cured by irradiation of ultraviolet rays or electron beams. Of course, the component (B) is also one of the active energy ray-curable compounds.

The active energy ray-curable compound of the component (A) is a compound having three or more ethylenically unsaturated groups in the molecule and other than the isocyanurate derivative. Examples of such a compound include trimethylolpropane tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, propionic acid-modified dipentaerythritol tri(meth)acrylate, and pentaerythritol III ( Methyl) acrylate, propylene oxide modified trimethylolpropane tri(meth) acrylate, propionic acid modified dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, A trifunctional or higher (meth) acrylate such as caprolactone-modified dipentaerythritol hexa(meth)acrylate. One type of these may be used alone or two or more types may be used in combination. The number of the ethylenically unsaturated groups is not particularly limited as long as it is three or more, and from the viewpoint of suppressing curl, it is preferably from 3 to 6.

On the other hand, as the component (B), an active energy ray-curable isomeric cyanurate derivative having three or more ethylenically unsaturated groups in the molecule, The compound having a structure in which three or more ethylenically unsaturated groups are bonded to the iso-cyanuric acid skeleton is not particularly limited, but isomeric cyanuric acid is preferred from the viewpoints of performance and ease of production. A structure in which all three nitrogen atoms of the skeleton are bonded to an ethylenically unsaturated group. The ethylenically unsaturated group is preferably a (meth)acryloxy group. Examples of such an isomeric cyanurate derivative include gin[(meth)acryloxyalkyl)isocyanurate represented by the formula (I).

(In the formula, A ¹ to A ³ each independently represent a (meth)acryloxy group, and R ¹ to R ³ each independently represent an alkylene group having 2 to 4 carbon atoms).

In the above formula (I), the alkylene group represented by R ¹ to R ³ may be either linear or branched, and specific examples thereof include an ethyl group, a propyl group, a cyclopropyl group, and various butyl groups. base. Further, the (meth)acryloxyalkyl group bonded to the three nitrogen atoms may be the same or different.

The para-[(meth)acryloxyalkyl)isocyanurate represented by the above formula (I) may, for example, be stilbene (2-propenylmethoxyethyl) isocyanate, Ginseng (3-propenyloxypropyl)isocyanate, ginseng (2-methylpropenyloxyethyl)isocyanate, ginseng (3-methylpropenyloxypropyl) ) isomeric cyanurate or the like.

In the present invention, the component (B) may be used alone or in combination of two or more. In addition, the content of the component (B) in the hard coat layer forming material is selected in the range of 150 to 550 parts by mass based on 100 parts by mass of the component (A). When the content is less than 150 parts by mass, the obtained hard coat film does not sufficiently exhibit the effect of suppressing curl, and if it exceeds 550 parts by mass, the surface hardness of the hard coat film is lowered. The content of the component (B) is preferably from 180 to 520 parts by mass from the viewpoint of suppressing the effect of curling and the balance of surface hardness.

In addition to the components (A) and (B), the hard coat layer forming material may contain other active energy ray-curable compounds as needed within a range not impairing the object of the present invention.

Examples of the other active energy ray-curable compound include an active energy ray-polymerizable prepolymer and/or an active energy ray-polymerizable monofunctional monomer and a bifunctional monomer.

Examples of the active energy ray-polymerizable prepolymer include polyester acrylates, epoxidized acrylates, urethane acrylates, and polyol acrylates.

On the other hand, examples of the active energy ray-polymerizable monofunctional monomer include methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, and hexyl (meth)acrylate. Cyclohexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, lauryl (meth)acrylate, n-octadecyl (meth)acrylate, isobornyl (meth)acrylate At least one of them is appropriately selected and used.

Further, as the active energy ray-polymerizable bifunctional monomer, for example, From 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, polyethylene glycol di(a) Acrylate, hydroxytrimethylacetic acid neopentyl glycol di(meth)acrylate, dicyclopentenyl di(meth)acrylate, caprolactone modified dicyclopentenyl di(methyl) Acrylate, ethylene oxide modified di(meth)acrylate, allylated cyclohexyl di(meth)acrylate, bis[2-(methyl)acryloxyethyl) At least one of tricyanate and bis[2-(methyl)acryloxyethyl]2-hydroxyethyl isocyanurate is appropriately selected and used.

In the hard coat layer forming material, a photopolymerization initiator may be contained. The photopolymerization initiator may, for example, be benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin n-butyl ether, benzoin isobutyl ether, acetophenone or dimethylaminobenzene. Ethyl ketone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenyl Propan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinyl-propan-1-one, 4-( 2-hydroxyethoxy)phenyl-2-(hydroxy-2-propyl)one, benzophenone, p-phenylbenzophenone, 4,4'-diethylaminobenzophenone, Dichlorobenzophenone, 2-methyl hydrazine, 2-ethyl hydrazine, 2-tributyl fluorene, 2-amino hydrazine, 2-methyl oxysulfide 2-ethyloxysulfide 2-chlorooxosulfur 2,4-dimethyloxosulfur 2,4-diethyloxysulfide Benzyl dimethyl ketal, acetophenone dimethyl ketal, p-dimethylamino benzoate and the like. One type of these may be used, or two or more types may be used in combination, and the amount of the active energy ray-curable compound is usually selected in the range of 0.2 to 10 parts by mass based on 100 parts by mass of the active energy ray-curable compound.

A solvent may be contained in the hard coat layer forming material. Examples of the solvent include aliphatic hydrocarbons such as hexane and heptane, aromatic hydrocarbons such as toluene and xylene, halogenated hydrocarbons such as dichloromethane and vinyl chloride, and alcohols such as methanol, ethanol, propanol and butanol, acetone and methyl ethyl ketone. , ketones such as 2-pentanone, isophorone, cyclohexanone, esters such as ethyl acetate and butyl acetate; solvents such as cellosolve such as ethyl cellosolve; glycol ether solvents such as propylene glycol monomethyl ether Wait. These solvents may be used alone or in combination of two or more.

Further, various additives may be appropriately contained, for example, a filler for providing anti-glare property, a reactive organic hydrazine compound, a photosensitizer, a polymerization inhibitor, a crosslinking agent, an antioxidant, an ultraviolet absorber, and a light stabilizer. , leveling agent, defoamer, etc.

As the filler which provides anti-glare property, it can be suitably selected from the well-known thing currently provided as the anti-glare filler. Examples of such a filler include cerium oxide particles having an average particle diameter of about 1.5 to 7 μm, and aggregates of an amine compound of colloidal cerium oxide particles, and an average particle diameter of about 0.5 to 10 μm, or A mixture of cerium oxide particles having an average particle diameter of about 0.5 to 5 μm and metal oxide fine particles having an average particle diameter of about 1 to 60 nm. The content of these fillers in the hard coat layer can be appropriately selected in consideration of the antiglare property, scratch resistance, and the like of the obtained hard coat film.

Further, as the reactive organic ruthenium compound, an organic ruthenium compound having a radical polymerizable unsaturated group in the molecule can be used. The organic cerium compound can be crosslinked by irradiation with an active energy ray and cured, and has an effect of imparting stain resistance and low friction to the hard coat layer.

In the present invention, the preparation contains the aforementioned components and is adjusted to be suitable for coating. a hard coat forming material (coating liquid) of a concentration, using a conventionally known method such as a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, a gravure printing method, or the like, Applying to the base film, and setting the thickness after curing to a predetermined value, applying an undried coating film, drying it at about 60 to 130 ° C for about 1 to 3 minutes, and then irradiating the dried coating film. The active energy ray cures the coating film to form a hard coat layer.

Examples of the active energy ray include ultraviolet rays, electron beams, and the like. The ultraviolet ray may be obtained by a high pressure mercury lamp, a fused H lamp, a xenon lamp or the like, and the irradiation amount is usually 100 to 500 mJ/cm ² , and the electron beam is obtained by an electron beam accelerator or the like, and the irradiation amount is usually 150 to 350 kV. Among the active energy rays, ultraviolet rays are particularly suitable. Further, when an electron beam is used, a cured film can be obtained without adding a photopolymerization initiator.

The thickness of the hard coat layer is usually about 3 to 10 μm. The hard coat film thus obtained is usually obtained by mounting a hard coat film having a square shape of 10 cm on a flat plate, and the total amount of the four-corner curl height is 100 mm or less, and the pencil hardness is 2H or more. In addition, the method of measuring the height of the curl and the hardness of the pencil is described in detail below.

In the hard coat film of the present invention, a transparent conductive film layer having a thickness of about 10 to 45 nm may be provided on the hard coat layer as needed. The method for forming the transparent conductive thin film layer is not particularly limited, and a conventionally known method such as a physical vapor deposition method (PVD method) such as sputtering or the like can be employed.

Further, examples of the material of the transparent conductive film include indium oxide, tin oxide, zinc oxide, indium-tin oxide, tin-bismuth oxide, zinc-aluminum oxide, and indium-zinc oxide.

The hard coat film of the present invention having a hard coat layer provided with a transparent conductive film layer on the surface has a high scratch resistance of the hard coat layer, so that the hard coat film is used for the touch side of a resistive film type touch panel. The transparent plastic substrate can solve the problem that the transparent conductive film of the transparent plastic substrate on the touch side is worn or cracked and peeled off from the substrate.

In the present invention, an antireflection layer for providing antireflection properties, for example, a siloxane oxide film, a fluorine film, or the like may be provided on the surface of the hard coat layer as needed. In this case, a suitable thickness of the antireflection layer is about 0.05 to 0.2 μm. Further, the reflectance at a wavelength of 550 nm is preferably 3.5% or less. By providing the antireflection layer, it is possible to eliminate the mapping of the screen due to reflection by sunlight, a fluorescent lamp, or the like, and it is possible to suppress the reflectance of the surface, and the transmittance of all the light is increased, and the transparency is improved.

In the present invention, an adhesive layer for bonding the adherend can be formed on the surface opposite to the hard coat layer of the base film. As the binder constituting the binder layer, a binder used in optical applications such as an acrylic binder, a polyurethane binder, or an organic oxime binder is preferably used. The thickness of the adhesive layer is usually 5 to 100 μm, preferably 10 to 60 μm.

Further, a release sheet may be provided on the adhesive layer as needed. Examples of the release sheet include papers such as cellophane, coated paper, and laminated paper, and a release agent such as an organic silicone resin coated on various plastic films. The thickness of the release sheet is not particularly limited and is usually about 20 to 150 μm.

The hard coat film of the present invention has sufficient surface hardness as a surface protective film of various image display devices, and the curl generated by curing shrinkage is small.

Example

Next, the present invention will be explained in more detail by way of examples, but the invention is not limited by the examples.

Further, the properties of the hard coat film obtained in each of the examples were evaluated according to the following methods.

(1) Pencil hardness

Using a pencil scratch coating hardness tester (manufactured by Toyo Seiki Seisakusho Co., Ltd., model "NP"), it was measured by a pencil method in accordance with JIS K5600-5-4.

(2) Curling

The hard coat film was cut into a square of 10 cm to prepare a test piece, and after standing at 23 ° C and a relative humidity (RH) of 55% for 24 hours, a test piece was placed on a level glass plate, and the upper portion was a concave portion. The four angular rise amounts were measured by a scale to obtain the total value.

Preparation Example 1 Preparation of Coating Liquid A

To 100 parts by mass of (A) pentaerythritol triacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name "NK ESTER A-TMM-3", solid content concentration: 100%), 200 parts by mass of (B) ginseng was added ( 2-propenyloxyethyl)isocyanate (manufactured by East Asia Synthetic Chemical Industry Co., Ltd., trade name "ARONIX M-315", solid content concentration: 100%), 6 parts by mass as a photopolymerization initiator 1-Hydroxy-cyclohexyl phenyl ketone (manufactured by CIBA SPECIALTY CHEMICALS, trade name "IRGACURE 184"), diluted with propylene glycol monomethyl ether to a solid concentration of 40% by mass to prepare a coating liquid A .

Preparation Example 2 Preparation of Coating Liquid B

In addition to the preparation of Example 1, (B) ginseng (2-propenyloxyethyl) heterotrimerization The coating liquid B was prepared in the same manner as in Preparation Example 1, except that the amount of the cyanate ester was changed to 500 parts by mass, and the amount of the 1-hydroxy-cyclohexyl phenyl ketone was changed to 12 parts by mass.

Preparation Example 3 Preparation of Coating Liquid C

In addition to the preparation example 1, (A) pentaerythritol triacrylate was changed to pentaerythritol tetraacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name "NK ESTER A-TMMT", solid content concentration: 100%), and prepared In the example 1, the coating liquid C was prepared in the same manner.

Preparation Example 4 Modulation of Coating Liquid D

The coating liquid D was prepared in the same manner as in Preparation Example 2 except that (A) pentaerythritol triacrylate was changed to pentaerythritol tetraacrylate (previously described above) in Preparation Example 2.

Preparation Example 5 Preparation of Coating Liquid E

In addition to the preparation example 1, (A) pentaerythritol triacrylate was changed to dipentaerythritol hexaacrylate (manufactured by East Asian Synthetic Chemical Industry Co., Ltd., trade name "ARONIX M-400", solid content concentration: 100%), and prepared In Example 1, the coating liquid E was prepared in the same manner.

Preparation Example 6 Preparation of Coating Liquid F

The coating liquid F was prepared in the same manner as in Preparation Example 2 except that (A) pentaerythritol triacrylate was changed to dipentaerythritol hexaacrylate (previously described above) in Preparation Example 2.

Preparation Example 7 Preparation of Coating Liquid G

The coating liquid G was prepared in the same manner as in Preparation Example 1, except that the amount of (B) gin (2-propenylmethoxyethyl) isocyanurate was changed to 350 parts by mass in Preparation Example 1.

Preparation Example 8 Preparation of Coating Liquid H

The amount of 1-hydroxy-cyclohexyl phenyl ketone was changed to 5, except that the amount of (B) gin (2-propenyl methoxyethyl) isocyanurate was changed to 100 parts by mass in Preparation Example 1. The coating liquid H was prepared in the same manner as in Preparation Example 1 except for the mass portion.

Preparation Example 9 Preparation of Coating Liquid I

The coating liquid I was prepared in the same manner as in Preparation Example 8 except that (A) pentaerythritol triacrylate was changed to dipentaerythritol hexaacrylate (previously described above) in Preparation Example 8.

Preparation Example 10 Preparation of Coating Liquid J

The amount of 1-hydroxy-cyclohexyl phenyl ketone was changed to 14 except that the amount of (B) gin (2-propenyl methoxyethyl) isocyanurate was changed to 600 parts by mass in Preparation Example 1. The coating liquid J was prepared in the same manner as in Preparation Example 1 except for the mass portion.

Preparation Example 11 Preparation of Coating Liquid K

The coating liquid K was prepared in the same manner as in Preparation Example 10 except that (A) pentaerythritol triacrylate was changed to dipentaerythritol hexaacrylate (previously described above) in Preparation Example 10.

Example 1

Coating liquids A to G prepared in Preparation Examples 1 to 7 were applied to a triethylenesulfonated cellulose film (manufactured by Fuji Photo Film Co., Ltd., trade name "T40UZ") having a thickness of 40 μm as a base film by a bar coater. The thickness after drying was 3 μm, and after drying at 70 ° C for 1 minute, the coated surface was irradiated with ultraviolet rays, and the amount of light was 230 mJ/cm ² , which was solidified to produce each hard coat film. The thickness of the hard coat layer was 3 μm.

The performance evaluation results of the respective hard coat films are shown in Table 1.

Example 2

A variety of hard coat films were produced in the same manner as in Example 1 except that the thickness was 6 μm after drying. The thickness of the hard coat layer was 6 μm.

The performance evaluation results of the respective hard coat films are shown in Table 1.

Example 3

A variety of hard coat films were produced in the same manner as in Example 1 except that the thickness was 10 μm after drying. The thickness of the hard coat layer was 10 μm.

The performance evaluation results of the respective hard coat films are shown in Table 1.

Comparative example 1

The coating liquids H and I prepared in Preparation Examples 8 and 9 were applied onto a triacetonitrile-based cellulose film (described above) having a thickness of 40 μm as a substrate by a bar coater, and the thickness after drying was 6 μm. After drying at ° C for 1 minute, the coated surface was irradiated with ultraviolet rays, and the amount of irradiation light was 230 mJ/cm ² , which was solidified to produce each hard coat film.

The performance evaluation results of the respective hard coat films are shown in Table 1.

Comparative example 2

The coating liquids J and K prepared in Preparation Examples 10 and 11 were applied onto a triacetonitrile-based cellulose film (described above) having a thickness of 40 μm as a base film by a bar coater, and the thickness after drying was 6 μm. After drying at 70 ° C for 1 minute, the coated surface was irradiated with ultraviolet rays, and the amount of light was 230 mJ/cm ² , which was solidified to produce each hard coat film.

The performance evaluation results of the respective hard coat films are shown in Table 1.

As is clear from Table 1, the pencil hardness of the hard coat film (Examples 1 to 3) of the present invention was 2H or more, and the amount of curl (total amount of 4 corners) was less than 100 mm.

On the other hand, the pencil hardness of the comparative example 1 was 2H or more and it was high, but the amount of crimping was large, and it was unsatisfactory. Further, although the amount of curling of Comparative Example 2 was small, the pencil hardness was H and it was unacceptable.

The hard coat film of the present invention has a sufficient surface hardness as a surface protective film of various image display devices, and has a small curl due to curing shrinkage, and is suitable for use as, for example, a touch panel, a polarizing plate, and a quarter-wave plate. Or it can be used as a cover film of a disc, a protective film of various displays, etc.

Claims (7)

A hard coat film comprising: a hard coat layer formed using an active energy ray-curable resin layer formed on a base film having a thickness of 80 μm or less using a hard coat layer forming material, and the hard coat layer forming material comprises (A) It has three or more ethylenically unsaturated groups in the molecule, and is an active energy ray-curable compound other than the isocyanurate derivative; and (B) has three or more molecules in the molecule with respect to 100 parts by mass thereof. The ethylenically unsaturated group active energy ray-curable isomeric cyanurate derivative is 150 to 550 parts by mass. The hard coat film of the first aspect of the invention, wherein the isocyanurate derivative of the component (B) has a structure in which all three nitrogen atoms of the iso-cyanuric acid skeleton are bonded to an ethylenically unsaturated group. The hard coat film of claim 1 or 2, wherein the height of the curl of the four corners generated when the hard coat film of a square having a side length of 10 cm is mounted on the flat plate is 100 mm or less, and the pencil hardness is 2H or more. A hard coat film according to claim 1 or 2, wherein the base film is a triethylenesulfonated cellulose film. A hard coat film according to claim 1 or 2, wherein the hard coat layer has a thickness of 3 to 10 μm. A hard coat film according to claim 1 or 2, wherein the component (A) is pentaerythritol triacrylate, pentaerythritol tetraacrylate or dipentaerythritol hexaacrylate. A hard coat film according to claim 1 or 2, wherein the component (B) is ginxyl (2-propenylmethoxyethyl) isocyanate.