KR20080068550A - Hard coat film - Google Patents

Abstract

A hard coat film is provided to ensure sufficient surface hardness necessary for surface-protective films of various display devices, and to show less curling caused by hardening shrinkage. A hard coat film includes a hard coat layer comprising an actinic energy ray-curable resin layer on the base material film. The hard coat layer is formed by using a hard coat layer formation material comprising (A) 100 parts by mass of an actinic energy ray-curable compound except an isocyanurate derivative, which has at least three ethylenically unsaturated groups in the molecule, and (B) 150-550 parts by mass of an actinic energy ray-curable isocyanurate derivative having at least three ethylenically unsaturated groups in the molecule.

Description

Hard Coating Film {HARD COAT FILM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard coat film, and more particularly, to a hard coat film having sufficient surface hardness as a surface protection film of various image display apparatuses and having small bending (curl) due to curing shrinkage.

Background Art Conventionally, hard coating films include surface protection in various image display devices such as LCDs (liquid crystal displays), touch panels, CRTs (brown tubes), PDPs (plasma display panels), ELs (electroluminescence), and the like. It is used for the purpose of anti-glare property and reflection prevention. Moreover, in LCD, it is used in order to protect a polarizer. This hard coat film generally has a hard coat layer formed on a base film by thermosetting, active energy ray hardening, or the like.

On the other hand, in recent years, thinning of an image display apparatus is calculated | required. In this case, the hard coating film is required to use a base film having a thickness of about half of the conventional thickness (about 80 ~ 125㎛). However, when the hard coating layer is formed on such a thin base film as in the prior art, curling occurs in the hard coating film due to curing shrinkage of the hard coating layer, and as a result, it becomes difficult to use as a surface protective film. , Leads to an undesirable state.

Therefore, in order to suppress hardening shrinkage and suppress curling, a curable composition containing a compound having three or more ethylenically unsaturated groups and one or more isocyanurate rings in the same molecule is applied and formed on the substrate and cured. The hard coat processed article which the film thickness of the hard coat layer after hardening made 15-15 micrometers or less is disclosed (for example, refer patent document 1). However, in this case, there is a problem that the thickness of the hard coat layer must be set large in order to obtain sufficient hardness.

Moreover, the technique which hardens the composition containing the isocyanurate derivative which has two ethylenically unsaturated groups, and pentaerythritol acrylate to make a hard-coating layer is disclosed (for example, refer patent document 2). However, in this technique, since the hardness of the hardened | cured material of the said isocyanurate derivative single body is inadequate, there is room for further improvement regarding the hardness of the hard coat layer which hardened the composition.

[Patent Document 1]

Japanese Patent Application Laid-Open No. 2004-141732

[Patent Document 2]

Japanese Patent Application Laid-Open No. 2005-103973

The present invention has been made in view of the above circumstances to provide a hard coat film having a sufficient surface hardness as a surface protection film of various image display apparatuses and a small bending caused by curing shrinkage.

MEANS TO SOLVE THE PROBLEM The present inventors earnestly researched in order to develop the hard-coating film which has the said desirable property, and as a result, the active energy ray hardening-type compound and active energy ray hardening-type isocyanurate derivative which each have a specific structure have a predetermined ratio. By using the hard coating layer forming material contained in the present invention, a hard coating layer composed of an active energy ray-curable resin layer was formed on a base film to find that the object can be achieved, and to complete the present invention based on this knowledge. Reached.

That is, the present invention,

[1] On the base film, three (A) molecules in the molecule (A) have three or more ethylenically unsaturated groups in addition to active energy ray-curable compounds other than isocyanurate derivatives and 100 parts by mass thereof Hard coating characterized by having a hard coating layer made of an active energy ray-curable resin layer formed by using a hard coating layer-forming material containing 150 to 550 parts by mass of an active energy ray-curable isocyanurate derivative having an ethylenically unsaturated group. film,

[2] The hard coat film according to the above [1], wherein the component (B) isocyanurate derivative has a structure in which ethylenically unsaturated groups are bonded to all three nitrogen atoms of the isocyanuric acid skeleton,

[3] The above-described curl height of four corners, which is generated when a 10 cm square hard coated film is placed on a plate, is 100 mm or less, and the pencil hardness is 2H or more. ] Or [2] the hard coating film,

[4] The hard coat film according to any one of [1] to [3], wherein the base film is a triacetyl cellulose film having a thickness of 80 µm or less, and

[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.

To provide.

According to the present invention, it is possible to provide a hard coat film having sufficient surface hardness as a surface protection film of various image display apparatuses and small bending due to curing shrinkage.

The hard coating film of this invention uses the hard-coating layer formation material containing the active energy ray hardening type compound other than (A) isocyanurate derivative and (B) active energy ray hardening type isocyanurate derivative on a base film. It has a hard coat layer which consists of an active energy ray hardening resin layer formed.

There is no particular limitation on the base film used in the hard coat film of the present invention, and may be appropriately selected and used from a known plastic film as a base material of a conventional hard coat film for optics. Examples of such plastic films include polyester films such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, polyethylene films, polypropylene films, cellophane, diacetyl cellulose films, triacetyl cellulose films and acetyl cellulose. Butylate film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene-vinyl acetate copolymer film, polystyrene film, polycarbonate film, polymethylpentene film, polysulfone film, polyether ether ketone film, Polyether sulfone film, polyetherimide film, polyimide film, fluorine resin film, polyamide film, acrylic resin film, norbornene-based resin film, cycloolefin resin film and the like.

These base films may be either transparent or translucent, may be colored, may be non-colored, and may be suitably selected according to a use. For example, when used for polarizer protection of a liquid crystal display, a colorless and transparent triacetyl cellulose film is suitable.

Although the thickness of these base films does not have a restriction | limiting in particular, Although it selects suitably according to a situation, 80 micrometers or less are preferable from a viewpoint which the suppression effect of curl generation is exhibited effectively, More preferably, it is the range of 20-80 micrometers. Moreover, this base film can be surface-treated by the oxidation method, an uneven | corrugated method, etc. to one side or both sides as needed, for the purpose of improving adhesiveness with the layer formed in the surface. Examples of the oxidation method include corona discharge treatment, plasma treatment, chromic acid treatment (wet), flame treatment, hot air treatment, ozone and ultraviolet irradiation treatment, and the like. A solvent treatment method and the like. Although these surface treatment methods are suitably selected according to the kind of base film, in general, the corona discharge treatment method is used preferably from a viewpoint of an effect, operability, etc.

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

In addition, the active energy ray hardening-type compound in the said (A) component means the compound which has an energy quantum in an electromagnetic wave or a charged particle beam, ie, the compound which bridge | crosslinks and hardens | cures by irradiating an ultraviolet-ray or an electron beam. Of course, (B) component is 1 type of an active energy ray hardening-type compound.

This (A) component active energy ray hardening-type compound has three or more ethylenically unsaturated groups in a molecule | numerator, and is a compound other than an isocyanurate derivative. As such a compound, for example, trimetholpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid-modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) Acrylate, propylene oxide modified trimetholpropane tri (meth) acrylate, propionic acid modified dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, caprolactone modified dipentaerythritol (Meth) acrylates more than trifunctional, such as hexa (meth) acrylate, are mentioned. These may be used individually by 1 type and may be used in combination of 2 or more type. Although there will be no restriction | limiting in particular if the number of ethylenically unsaturated groups is three or more, 3-6 pieces are preferable from a viewpoint of curl suppression.

On the other hand, as an active energy ray hardening type isocyanurate derivative which has three or more ethylenically unsaturated groups in the molecule which is (B) component, what is necessary is just a compound which has a structure which three or more ethylenically unsaturated groups couple | bonded with the isocyanuric acid skeleton, Although there is no restriction | limiting in particular, From a viewpoint of performance, ease of manufacture, etc., it is preferable that it is the structure which the ethylenically unsaturated group couple | bonded with all three nitrogen atoms of the isocyanuric acid skeleton. As an ethylenically unsaturated group, a (meth) acryloyloxy group is preferable. As such an isocyanurate derivative, it is general formula (I), for example.

[Tue 1]

(In formula, A <^1> -A <^3> respectively independently represents a (meth) acryloyloxy group and R <^1> -R <^3> represents a C2-C4 alkylene group each independently)

Tris [(meth) acryloyloxyalkyl] isocyanurate represented by is mentioned.

In the general formula (I), the alkylene group represented by R ¹ to R ³ may be either a straight chain or a branched chain, specifically, an ethylene group, a propylene group, trimethylene group, and various butyls. Rengi is mentioned. Moreover, the (meth) acryloyloxyalkyl group couple | bonded with three nitrogen atoms may mutually be same or different.

As tris [(meth) acryloyloxyalkyl] isocyanurate represented by the said General formula (I), for example, tris (2-acryloyloxyethyl) isocyanurate and tris (3-acrylo) Iloxypropyl) isocyanurate, tris (2-methacryloyloxyethyl) isocyanurate, tris (3-methacryloyloxypropyl) isocyanurate, etc. are mentioned preferably.

In this invention, as (B) component, these compounds may be used individually by 1 type, and may be used in combination of 2 or more type. Moreover, content of the said (B) component in a hard-coat layer forming material is selected in the range of 150-550 mass parts with respect to 100 mass parts of said (A) component. When this content is less than 150 mass parts, the curl suppression effect of the hard coat film obtained is not fully exhibited, and when it exceeds 550 mass parts, the surface hardness of a hard coat film will fall. From the viewpoint of the effect of suppressing curl generation, the balance of surface hardness, and the like, the preferred content of the component (B) is in the range of 180 to 520 parts by mass.

In addition to the above-mentioned (A) component and (B) component, the said hard coat layer forming material can contain another active energy ray hardening-type compound as needed in the range which does not impair the objective of this invention.

As another active energy ray hardening-type compound, an active energy ray polymerizable prepolymer and / or an active energy ray polymerizable monofunctional monomer and a bifunctional monomer are mentioned, for example.

As an active energy ray polymerizable prepolymer, a polyester acrylate type, an epoxy acrylate type, a urethane acrylate type, a polyol acrylate type etc. are mentioned, for example.

On the other hand, as an active energy ray polymerizable monofunctional monomer, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate, for example. , At least one of 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, isobornyl (meth) acrylate and the like can be appropriately selected and used.

Moreover, as an active energy ray polymerizable bifunctional monomer, 1, 4- butanediol di (meth) acrylate, 1, 6- hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, Polyethylene glycol di (meth) acrylate, hydroxypivalate neopentyl glycoldi (meth) acrylate, dicyclopentanyldi (meth) acrylate, caprolactone modified dicyclopentenyldi (meth) acrylate, ethylene oxide modified Di (meth) acrylate, allylated cyclohexyldi (meth) acrylate, bis [2- (meth) acryloxyethyl] isocyanurate, bis [2- (meth) acryloxyethyl] 2-hydroxy At least 1 sort (s) chosen from ethyl isocyanurate etc. can be selected suitably and can be used.

The hard coat layer forming material may contain a photopolymerization initiator. Examples of the photoinitiator include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetphenone, dimethylaminoacephenone, 2,2-dimethoxy-2-phenylacetphenone, 2,2-diethoxy-2-phenylacetphenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl Phenylketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2 (hydroxy-2- Propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-terishari-butylanthraquinone, 2 -Amino anthraquinone, 2-methyl thioxanthone, 2-ethyl thioxanthone, 2-chlorothioxanthone, 2,4-dimethyl thioxanthone, 2,4-diethyl thioxanthone, benzyl dimethyl ketal, acet Phenone dimethyl ketal, p-dimethylamine benzoic acid And tere. These may be used 1 type or may be used in combination of 2 or more type, The compounding quantity is normally selected in the range of 0.2-10 mass parts with respect to 100 mass parts of active energy ray hardening-type compounds.

The hard coat layer forming material may contain a solvent. Examples of the solvent include aliphatic hydrocarbons such as hexane and heptane, aromatic hydrocarbons such as toluene and xylene, halogenated hydrocarbons such as methylene chloride and ethylene chloride, alcohols such as methanol, ethanol, propanol and butanol, acetone, methyl ethyl ketone, Ketones such as 2-pentanone, isopron and cyclohexanone, esters such as ethyl acetate and butyl acetate, cellosolve solvents such as ethyl cellosolve, glycol ether solvents such as propylene glycol monomethyl ether, and the like. have. These solvents may be used individually by 1 type, and may mix and use 2 or more types.

In addition, various additives such as fillers for imparting antiglare properties, reactive silicone compounds, photosensitizers, polymerization inhibitors, crosslinking agents, antioxidants, ultraviolet absorbers, light stabilizers, leveling agents, antifoaming agents, and the like may be appropriately contained. Can be.

As the filler for imparting antiglare property, any of those conventionally known as fillers for imparting antiglare property can be appropriately selected and used. Such fillers are, for example, aggregates of silica particles having an average particle size of about 1.5 to 7 µm and amine compounds of colloidal silica particles, having an average particle diameter of about 0.5 to 10 µm, or an average particle diameter of about 0.5 to 5 µm. And a mixture of silica particles and metal oxide fine particles having an average particle diameter of about 1 to 60 nm. It is preferable that content in the hard coat layer of these fillers is suitably selected in consideration of anti-glare performance, scratch resistance, etc. of the obtained hard coat film.

Moreover, as a reactive silicone compound, the silicone compound which has a radically polymerizable unsaturated group in a molecule | numerator can be used. This silicone compound has the effect | action which crosslinks and hardens | cures by irradiation of an active energy ray, and imparts contamination resistance, low friction resistance, etc. to a hard coat layer.

In the present invention, a hard coating layer-forming material (coating solution) containing each of the above-described components and adjusted to a concentration suitable for coating is prepared, and a conventionally known method such as a bar coating method and a knife on the base film. 60-130 after coating and forming an undried coating film using the coating method, the roll coating method, the blade coating method, the die coating method, the gravure coating method, etc. so that the thickness after hardening may become a predetermined value. After drying for about 1 to 3 minutes at about C, the hard coat layer is formed by irradiating an active energy ray to the dry coating film to cure the coating film.

As an active energy ray, an ultraviolet-ray, an electron beam, etc. are mentioned, for example. The ultraviolet light is obtained by a high pressure mercury lamp, a fusion H lamp, a xenon lamp, or the like, and the irradiation amount is usually 100 to 50OmJ / cm 2, while the electron beam is obtained by an electron beam accelerator or the like and the irradiation amount is usually 150 to 350 kV. Among these active energy rays, ultraviolet rays are particularly suitable. In addition, when using an electron beam, a cured film can be obtained without adding a photoinitiator.

The thickness of a hard coat layer is about 3-10 micrometers normally. In the hard coat film obtained in this way, the sum of the curl heights of the four corners which generate | occur | produce when the hard coat film cut | disconnected on the flat surface in 100 cm square on the flat plate is 100 mm or less normally, and pencil hardness is 2H or more to be. In addition, the measuring method of the height of a curl and a pencil hardness is explained later.

In the hard coat film of the present invention, a transparent conductive thin film layer having a thickness of about 10 to 45 nm can be formed on the hard coat layer as necessary. There is no restriction | limiting in particular in the formation method of this transparent conductive thin film layer, A conventionally well-known method, for example, physical vapor deposition methods (PVD method), such as sputtering, etc. can be employ | adopted.

In addition, examples of the material of the transparent conductive thin film include indium oxide, tin oxide, zinc oxide, indium tin oxide, tin-antimony oxide, zinc-aluminum oxide, indium zinc oxide and the like.

The hard coating film of the present invention having a hard coating layer having a transparent conductive thin film layer formed on its surface has high scratch resistance of the hard coating layer. Therefore, the hard coating film is a touch-side transparent plastic substrate in a resistive touch panel. By applying to the above, the problem that the transparent conductive thin film of the touch-side transparent plastic substrate is worn, cracks, or even peels off from the substrate can be solved.

In the present invention, an antireflection layer, for example, a siloxane coating, a fluorine coating, or the like can be formed on the surface of the hard coat layer as necessary to impart antireflection. In this case, the thickness of the antireflection layer is preferably about 0.05 to 0.2 μm. Moreover, as for the reflectance of wavelength 550nm, 3.5% or less is preferable. By forming this antireflection layer, the halation of the screen resulting from reflection by sunlight, fluorescent lamps, or the like is eliminated, and the total light transmittance is raised by suppressing the reflectance of the surface, thereby improving transparency.

In this invention, the adhesive layer for adhering to a to-be-adhered body can be formed in the surface opposite to the hard coat layer of a base film. As an adhesive which comprises this adhesive layer, what is for optical uses, for example, an acrylic adhesive, a urethane type adhesive, and a silicone type adhesive is used preferably. The thickness of this adhesive layer is 5-100 micrometers normally, Preferably it is the range of 10-60 micrometers.

Moreover, a peeling sheet can be formed on this adhesive layer as needed. As this peeling sheet, what apply | coated peeling agents, such as a silicone resin, to paper and various plastic films, such as glassine paper, a coated paper, a laminated paper, etc. are mentioned, for example. Although there is no restriction | limiting in particular about the thickness of this peeling sheet, Usually, it is about 20-150 micrometers.

 The hard coat film of the present invention has a sufficient surface hardness as a surface protection film of various image display apparatuses and is small in bending due to curing shrinkage.

<Example>

Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.

In addition, the performance of the hard coat film obtained by each example was evaluated in accordance with the following method.

(1) pencil hardness

Pencil scraping Coating hardness tester [Toyo Seiki Seisaku-Sho, Ltd. product, model "NP"] using pencil method in accordance with JIS K 5600-5-4 Measured.

(2) curl

The test piece was prepared by cutting the hard coating film at 10 cm square at right angles, and after standing for 24 hours in an environment of 23 ° C. and 55% relative humidity (RH), the test piece was concave up on a horizontal glass plate. It mounted and measured the floating of four corners according to the normal, and calculated | required the total value.

Preparation Example 1 Preparation of Coating Liquid A

(A) to 100 parts by mass of pentaerythritol triacrylate [SHIN NAKANURA CHEMICAL CO., LTD. Product, brand name "NK ester A-TMM-3", solid content concentration 100%] , (B) tris (2-acryloyloxyethyl) isocyanurate [Toagosei Co., Ltd. product, brand name "ARONIX M-315", solid content concentration 100%] 200 6 parts by mass of 1-hydroxycyclohexylphenyl ketone (manufactured by Ciba Specialty Chemicals Co., Ltd., trade name "Irgacure 184") as a mass part and a photopolymerization initiator, and solid content concentration It diluted with propylene glycol monomethyl ether so that it might become 40 mass%, and the coating liquid A was prepared.

Preparation Example 2 Preparation of Coating Liquid B

In Preparation Example 1, the amount of (B) tris (2-acryloyloxyethyl) isocyanurate was changed to 500 parts by mass and the amount of 1-hydroxycyclohexylphenyl ketone was changed to 12 parts by mass. In the same manner as in Preparation Example 1, the coating liquid B was prepared.

Preparation Example 3 Preparation of Coating Liquid C

In Preparation Example 1, (A) Pentaerythritol triacrylate was changed to pentaerythritol tetraacrylate [manufactured by Shin-Nakamura Kagaku Kogyo Co., Ltd., product name "NK ester A-TMMT", solid content concentration 100%]. A coating liquid C was prepared in the same manner as in Preparation Example 1 except for the above.

Preparation Example 4 Preparation of Coating Liquid D

In Preparation Example 2, the (A) pentaerythritol triacrylate was changed to pentaerythritol tetraacrylate (manufactured by Shin-Nakamura Kagaku Kogyo Co., Ltd., trade name "NK ester A-TMMT", solid content concentration 100%). A coating liquid D was prepared in the same manner as in Preparation Example 2 except for the above.

Preparation Example 5 Preparation of Coating Liquid E

In Preparation Example 1, (A) the pentaerythritol triacrylate was changed to dipentaerythritol hexaacrylate (manufactured by Toago Seika Chemical Co., Ltd., product name "Aronix M-400", solid content concentration 100%). A coating liquid E was prepared in the same manner as in Preparation Example 1 except for the above.

Preparation Example 6 Preparation of Coating Liquid F

In Preparation Example 2, (A) pentaerythritol triacrylate was changed to dipentaerythritol hexaacrylate (manufactured by Toago Seika Chemical Co., Ltd., product name "Aronix M-400", solid content concentration 100%). A coating solution F was prepared in the same manner as in Preparation Example 2 except for the above.

Preparation Example 7 Preparation of Coating Liquid G

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

Preparation Example 8 Preparation of Coating Liquid H

In Preparation Example 1, except that the amount of (B) tris (2-acryloyloxyethyl) isocyanurate was changed to 100 parts by mass and the amount of 1-hydroxycyclohexylphenyl ketone was changed to 5 parts by mass. In the same manner as in Preparation Example 1, the coating solution H was prepared.

Preparation Example 9 Preparation of Coating Liquid I

In Preparation Example 8, (A) pentaerythritol triacrylate as dipentaerythritol hexaacrylate (Toago Seika Chemical Co., Ltd. product, brand name "Aronix M-400", solid content concentration 100%) Except having changed, the coating liquid I was prepared similarly to the preparation example 8.

Preparation Example 1 Preparation of the Coating Liquid J

In Preparation Example 1, the amount of (B) tris (2-acryloyloxyethyl) isocyanurate was changed to 600 parts by mass and the amount of 1-hydroxycyclohexylphenyl ketone was changed to 14 parts by mass. In the same manner as in Preparation Example 1, the coating solution J was prepared.

Preparation Example 11 Preparation of Coating Liquid K

In Preparation Example 10, (A) pentaerythritol triacrylate was changed to dipentaerythritol hexaacrylate (manufactured by Toago Seikagaku Co., Ltd., trade name "Aronix M-400", solid content concentration 100%). A coating liquid K was prepared in the same manner as in Preparation Example 10 except for the above.

Example 1

As the base film, coating liquids A to G prepared in Preparation Examples 1 to 7 on a triacetyl cellulose film (manufactured by Fujishashin Film Co., Ltd., trade name "T40UZ") having a thickness of 40 µm, using a bar coater. After coating so that the thickness after drying might be 3 micrometers, and drying at 70 degreeC for 1 minute, it irradiated and hardened | cured the ultraviolet-ray to light quantity 230mJ / cm <2> on the coating surface, and produced each hard coat film. The thickness of the hard coat layer was 3 μm.

Table 1 shows the performance evaluation results of each hard coating film.

Example 2

In Example 1, each hard coat film was produced like Example 1 except having apply | coated so that the thickness after drying might be set to 6 micrometers. The thickness of the hard coat layer was 6 μm.

Table 1 shows the performance evaluation results of each hard coating film.

Example 3

In Example 1, each hard coat film was produced like Example 1 except having apply | coated so that the thickness after drying might be set to 100 micrometers. The thickness of the hard coat layer was 10 탆.

Table 1 shows the performance evaluation results of each hard coating film.

Comparative Example 1

As a base film, the coating liquids H and I prepared in Formulation Examples 8 and 9 on the triacetyl cellulose film (Fuji Shashin Film Co., Ltd. product, brand name "T40UZ") of 40 micrometers in thickness after drying using the bar coater After apply | coating so that it might become 6 micrometers, and drying at 70 degreeC for 1 minute, it irradiated and hardened | cured by irradiating an ultraviolet-ray to light quantity 230mJ / cm <2> on the coated surface, and produced each hard coat film.

Table 1 shows the performance evaluation results of each hard coating film.

Comparative Example 2

As a base film, the coating liquids J and K prepared in Formulation Examples 10 and 11 on the triacetyl cellulose film (Fuji Shashin Film Co., Ltd. product, brand name "T40UZ") of 40 micrometers in thickness were dried using the bar coater. After apply | coating so that it might become 6 micrometers, and drying at 70 degreeC for 1 minute, ultraviolet-ray was irradiated to the coating surface with the light quantity 230mJ / cm <2>, and it hardened | cured, and each hard coat film was produced.

Table 1 shows the performance evaluation results of each hard coating film.

Coating liquid Curl (mm) Pencil hardness   Example 1 [Thickness of Hard Coating Layer 3 μm] A 18.0 2H B 6.0 2H C 11.5 2H D 7.0 2H E 16.5 2H F 10.0 2H G 10.0 2H   Example 2 [Thickness of Hard Coating Layer 6 μm] A 33.0 2H B 25.0 2H C 49.0 2H D 30.5 2H E 61.5 2H F 31.5 2H G 29.0 2H   Example 3 [Thickness of Hard Coating Layer 10 탆] A 88.5 2H B 42.5 2H C 92.0 2H D 58.0 2H E 96.0 3H F 64.5 2H G 65.0 2H Comparative Example 1 [Thickness of Hard Coating Layer 6 μm] H 115 2H I Not measurable * 3H Comparative Example 2 [Thickness of Hard Coating Layer 6 μm] J 21.0 H K 27.5 H

* The hard coat film became round and could not be measured.

As can be seen from Table 1, all of the hard coat films (Examples 1 to 3) of the present invention have a pencil hardness of 2H or more and a curl amount (sum of four corners) is less than 100 mm.

On the other hand, in Comparative Example 1, although the pencil hardness is higher than 2H or higher, the curl amount is large and disqualifies. In Comparative Example 2, although the curl amount is small, the pencil hardness is H and fail.

The hard coat film of the present invention has a sufficient surface hardness as a surface protection film of various image display apparatuses and is less likely to be bent due to hardening shrinkage, for example, for touch panels, polarizing plates, quarter wave plates, or the like. It is used suitably as a cover film of an optical disc, the protective film of various displays, etc.

Claims (5)

On a base film, it has 3 or more ethylenically unsaturated groups in (A) molecule | numerator, and it is 3 in (B) molecule | numerator with respect to active-energy-ray-curable compound other than an isocyanurate derivative, and its 100 mass parts. A hard coating comprising an active energy ray-curing resin layer formed by using a hard coating layer-forming material containing 150 to 550 parts by mass of an active energy ray-curing isocyanurate derivative having at least two ethylenically unsaturated groups. Coated film. The method of claim 1, (B) The component isocyanurate derivative has the structure which the ethylenically unsaturated group couple | bonded with all three nitrogen atoms of the isocyanuric acid skeleton, The hard coat film characterized by the above-mentioned. The method according to claim 1 or 2, Hard coating characterized in that the total of the curl heights of the four corners generated when the hard coating film cut in 10 cm square on the plate is 100 mm or less and the pencil hardness is 2H or more. film. The method according to claim 1 or 2, The base film is a triacetyl cellulose film having a thickness of 80 μm or less, a hard coating film. The method according to claim 1 or 2, Hard coating film, characterized in that the thickness of the hard coating layer is 3 ~ 10㎛.