JP2002220487A - Hard coat film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hard coat film, capable of improving an adhesiveness between a plastic film and a hard coat while keeping a surface hardness of 4 or above by pencil test and a surface flatness, and diminishing a generation of crack and curl in bending the film. SOLUTION: Fine particles having a particle diameter in the range of 10 nm-5 μm are homogeneously dispersed in a hard-coat film layer at a ratio of 10-500 wt.pts. to 100 wt.pts. of a radiation-curing type (meth)acrylate having a (meth)acryloyl group. The hard-coat film layer is installed on at least one side of the plastic film, the above fine particles have also a kind of two or above, and the particle diameter of each kind of fine particles is set to be narly same, wherein an average particle diameter of one kind of fine particles is twice or above of another kind of fine particles, and a radius of curvature of curl is 20 cm or above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard coat film used for protection of optical members such as various displays, lenses, mirrors, goggles, and window glasses.
In particular, a liquid crystal display device, CR, which is provided with scratch resistance, scratch resistance, crack resistance upon bending, curl resistance, etc.
T display, plasma display, electrochromic display, light emitting diode display, EL display, etc.
The present invention relates to a hard coat film suitable for protecting screens of various display devices.

[0002]

2. Description of the Related Art Conventionally, liquid crystal display devices, CRT display devices,
In addition, a transparent plastic film having scratch resistance and scratch resistance is often set or attached to optical members such as commercial displays, lenses, mirrors, window glasses, and goggles. In general, to harden the surface of a hard coat film formed by forming a hard coat layer on the surface of a plastic film, a thermosetting resin such as an organosiloxane or melamine resin is coated, or a vacuum evaporation method or a sputtering method is used. There is a method of forming a metal thin film by a method or the like, or a method of coating a radiation-curable (meth) acrylate. In recent years, among such methods, a method of coating a radiation-curable resin which is easy to process a large area and has excellent productivity is often adopted.

However, when a hard coat film having a hard coat layer is produced by any of these methods, the obtained hard coat film has an adhesive property between the hard coat layer and the plastic film, a crack resistance when the film is bent, Even if the curl resistance and the like of the film are within a range in which there is no practical problem, the surface hardness represented by pencil hardness is often limited to 2H to 3H.

[0004] Generally, the surface hardness of a hard coat film is improved by increasing the thickness of the hard coat layer.
However, increasing the thickness of the hard coat layer causes problems such as a decrease in adhesion to a plastic film, generation of cracks, and significant curling.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks and improves the adhesion between a plastic film and a hard coat layer while maintaining a surface hardness of 4H or more and a surface smoothness. It is an object of the present invention to provide a hard coat film capable of reducing generation of cracks and curling of the film at the time.

[0006]

Means for Solving the Problems The present invention has been made to achieve the above object, and a hard coat film according to claim 1 is a radiation-curable (meth) having a (meth) acryloyl group. Fine particles having a particle size in the range of 10 nm to 5 μm are included in 100 parts by weight of the acrylate.
A hard coat film in which a hard coat layer uniformly dispersed at a ratio of 0 to 500 parts by weight is provided on at least one surface of a plastic film, wherein the fine particles are
More than one type, and the particle size of the fine particles is set to be substantially the same for each type, and the average particle size of one type of fine particles is at least twice the average particle size of the other type of fine particles. In addition, the curl radius of curvature is 20 cm or more.

A hard coat film according to a second aspect is characterized in that, in the hard coat film according to the first aspect, the radiation-curable (meth) acrylate has three or more (meth) acryloyl groups. I do.

Further, the hard coat film according to claim 3 is the hard coat film according to claim 1 or 2, wherein the two or more kinds of fine particles are all inorganic fine particles, all organic fine particles or inorganic fine particles. And organic fine particles.

Further, the hard coat film according to the fourth aspect is the hard coat film according to any one of the first to third aspects, wherein a functional inorganic thin film is provided on the surface of the hard coat layer. It is characterized by having.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a schematic configuration of a hard coat film 7 according to one embodiment of the present invention. The hard coat film 7 is basically constituted by providing the hard coat layer 3 on at least one surface of the plastic film 1.

The plastic film 1 is not particularly limited, and can be appropriately selected from known transparent plastic films. Specifically, polyester, polyethylene, polypropylene, cellophane, triacetyl cellulose, diacetyl cellulose,
Acetyl cellulose butyrate, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, ethylene vinyl alcohol, polystyrene, polycarbonate, polymethylpentene, polysulfone, polyetherketone, acrylic, nylon, fluororesin, polyimide, polyetherimide, polyether Although a film or sheet such as sulfone can be mentioned, in the present invention, triacetylcellulose, and uniaxially stretched polyester are particularly preferable because they have excellent transparency and do not have optical anisotropy. .

On at least one surface of the plastic film 1, 10 to 500 parts by weight of fine particles having a particle diameter in a range of 10 nm to 5 μm are added to 100 parts by weight of a radiation-curable (meth) acrylate having a (meth) acryloyl group. The hard coat layer 2 dispersed in the ratio of parts is provided.

The radiation-curable (meth) acrylate having a (meth) acryloyl group is not particularly limited as long as it has one or more functional (meth) acryloyl groups and forms a cured film by a curing reaction by irradiation with radiation. . However, in order to form the hard coat layer 2 that requires a higher surface hardness, the cured film must have a high crosslink density.
It is more preferable to select one having a functional or higher (meth) acryloyl group. Specifically, it is a (meth) acrylate monomer or oligomer having a trifunctional or higher (meth) acryloyl group.

Examples of the (meth) acrylate monomer or oligomer having a trifunctional or higher (meth) acryloyl group include polyfunctional acrylates such as (meth) acrylic acid esters of polyhydric alcohols, for example, dipentaerythritol hexaacrylate (DPHA), dipentaerythritol pentaacrylate (DPPA), pentaerythritol tetraacrylate (PEET)
A), pentaerythritol triacrylate (PET)
A), ditrimethylolpropane tetraacrylate (DTMPTA), trimethylolpropane triacrylate (TMPTA), and methacrylates thereof;
Derivatives, ethylene oxide, propylene oxide,
Modified products such as caprolactone are exemplified. Further, a polyfunctional urethane acrylate synthesized from a diisocyanate, a polyhydric alcohol, and a hydroxyalkyl ester of (meth) acrylic acid can also be used. These may be used alone or in combination of two or more.

In addition to the above-mentioned acrylate monomer or oligomer having a trifunctional or higher functional (meth) acryloyl group, for the purpose of adjusting the surface hardness, the viscosity of the coating solution, etc.,
One or more bifunctional (meth) acrylates may be added. For example, ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, polyethylene glycol diacrylate, hexanediol diacrylate, neopentyl glycol diacrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, hexyl acrylate, isooctyl ( Meth) acrylate, 2-hydroxyethyl acrylate, cyclohexyl acrylate,
Nonylphenyl acrylate, tetrahydrofurfuryl acrylate, and methacrylates and derivatives thereof,
It is a denatured product.

Further, as the radiation-curable (meth) acrylate, a polymer having a (meth) acryloyl group can be used.

As described above, the cured film resin composition is
By using a radiation-curable (meth) acrylate having an acryloyl group as a main component, the adhesion to the plastic film 1 is improved, and the resulting cured film (hard coat layer 2) has abrasion resistance and the like. improves.

On the other hand, for these radiation-curable (meth) acrylates having (meth) acryloyl groups,
The hard coat layer 2 described below disperses two or more types of fine particles in order to maintain the surface hardness and surface smoothness of pencil hardness of 4H or more, and to generate cracks and reduce curling of the film when bending the film.

These fine particles are of two or more types, the particle size of each type of fine particles is in the range of 10 nm to 5 μm, and the particle size of each type is set to be substantially the same. Moreover, the average particle size of one type of fine particles is twice or more the average particle size of the other type of fine particles, and the radiation-curable (meth) type having the (meth) acryloyl group described above.
It is uniformly dispersed at a ratio of 10 to 500 parts by weight with respect to 100 parts by weight of the acrylate.

The hard coat film 7 shown in FIG. 1 is an example in which two kinds of fine particles 4, 5 are dispersed in a radiation-curable (meth) acrylate 3 having a (meth) acryloyl group.

The two or more types of fine particles have a particle size of 10 nm.
When the particle size is less than the above, the particles are aggregated and the dispersibility in the hard coat layer 2 is deteriorated. When the particle size is more than 5 μm, the smoothness of the surface of the hard coat layer 2 is deteriorated. Further, in the case of a hard coat film requiring transparency, if the particle diameter is larger than 100 nm, a decrease in transmittance due to light scattering occurs.
It is necessary to select fine particles of 100 nm or less.

As described above, the mixing ratio of the fine particles is 10 to 100 parts by weight of the radiation-curable (meth) acrylate having the (meth) acryloyl group.
Although it is 500 parts by weight, if it is less than 10 parts by weight, sufficient surface hardness cannot be obtained, and if it is more than 500 parts by weight, on the contrary, the surface hardness decreases and the smoothness of the surface of the hard coat layer 3 is lowered. Will be spoiled.

As described above, the effects of dispersing the fine particles in the hard coat layer include a reduction in curl and an improvement in the surface hardness, but the effect tends to increase as the finer the fine particles. However, conversely, finer particles tend to crack more easily. Therefore, two or more types of fine particles to be dispersed are used, the average particle size of one type of fine particles is twice or more the average particle size of the other type of fine particles, and the curl radius of curvature of the film is 20 cm or more. Here, the curl radius of curvature is a radius of a circle having a curl of a hard coat film cut into a 10 cm square as a part of a track, and can be calculated from the curl warpage and dimensions. The smaller the radius of curvature of the curl is, the larger the curl is, the more easily cracks are generated, and the workability in the post-process of bonding to the optical member is deteriorated. Therefore,
The larger the radius of curvature of the curl is, the better, but if it is 20 cm or more, the problems described above can be solved.

The mixing ratio of the two or more types of fine particles can be appropriately selected depending on the use of the hard coat film, the required transmittance, and the like. As a compounding ratio, for example, the one type of fine particles and the other type of fine particles are 30: 70-
1:99. As described above, by adjusting the particle diameters of two or more types of fine particles together, the effect of relaxing the internal stress of the hard coat layer 2 and suppressing the occurrence of cracks is exhibited.

These fine particles can be used arbitrarily as long as they maintain the necessary transmittance in (meth) acrylate. Inorganic or organic fine particles or a combination thereof can be used.

As the inorganic fine particles, silica, alumina,
Fine particles made of titania, zirconia, or the like may be mentioned, but silica particles, particularly, for example, synthetic silica particles synthesized by a sol-gel method are preferable in terms of transparency.
In addition, conductive transparent fine particles such as tin oxide, indium oxide, cadmium oxide, and antimony oxide can be used as needed from a viewpoint different from the provision of antistatic properties.

As the organic fine particles, hard fine particles having an appropriate crosslinked structure and less swelling due to an active energy ray-curable resin, a monomer, a solvent or the like can be used. For example, styrene-based resin of particle internal cross-linking type, styrene-acrylic copolymer resin, acrylic resin, divinylbenzene resin, silicone resin, urethane resin, melamine resin, styrene-isoprene resin,
A benzoguanamine resin, or a microgel containing the above resin or the like as a main component can be used.

The above-mentioned inorganic or organic fine particles may be subjected to a surface treatment to improve the dispersibility of the fine particles, to improve the wettability with the (meth) acrylate component or the plastic film, or to impart reactivity.

When the radiation for curing the above-mentioned radiation-curable monomers, oligomers and polymers is ultraviolet light, a photosensitizer (radical polymerization initiator) is added.
For example, benzoin and its alkyl ethers such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzyl methyl ketal, and acetophenones such as acetophenone, 2,2-dimethoxy-2-phenylacetophenone, and 1-hydroxycyclohexylphenyl ketone , Methylanthraquinone, 2-ethylanthraquinone, 2-
Anthraquinones such as amylanthraquinone, thioxanthone, 2,4-diethylthioxanthone, 2,4-
Thioxanthones such as diisopropylthioxanthone, ketals such as acetophenone dimethyl ketal and benzyl dimethyl ketal, benzophenone, 4,4
-Benzophenones such as bismethylaminobenzophenone and azo compounds. These can be used alone or as a mixture of two or more. Further, tertiary amines such as triethanolamine and methyldiethanolamine; benzoic acid derivatives such as 2-dimethylaminoethylbenzoic acid and ethyl 4-dimethylaminobenzoate; It can be used in combination with a photoinitiating aid or the like.
The amount of the photosensitizer (radical polymerization initiator) or photoinitiator used is determined by the amount of the polymerizable component of the (meth) acrylate.
0.5 to 20 parts by weight, preferably 1 to 0 parts by weight
15 parts by weight.

In addition to the above-mentioned components, known general paint additives can be blended if necessary. For example, a silicone-based or fluorine-based additive that imparts leveling, surface slip properties, etc. is effective in preventing scratches on the surface of the cured film. By the bleeding, the inhibition of curing of the resin by oxygen can be reduced, and an effective degree of hardness can be obtained even under a low irradiation intensity condition of radiation. An appropriate amount of the paint additive is 0.01 to 0.5 parts by weight based on 100 parts by weight of the (meth) acrylate component.

Although the constituent materials of the hard coat layer 2 have been described above, the hard coat layer 2 is prepared by preparing a hard coat coating solution from these constituent materials of the hard coat layer and coating the hard coat coating solution on the plastic film described above. can get.

Further, the hard coat coating liquid can be diluted with a dispersion liquid or the like, if necessary. As a dispersion,
Water, methanol, ethanol, isopropanol, n-
Use alcohols such as butanol, polyhydric alcohols such as ethylene glycol and derivatives thereof, ketones such as methyl ethyl ketone, methyl isobutyl ketone and dimethylacetamide, esters such as ethyl acetate, and nonpolar solvents such as toluene and xylene. be able to.

The method of applying the hard coat coating solution to the plastic film is not particularly limited, but practically, a roll coater, a reverse roll coater,
Coating with a gravure coater, knife coater, bar coater or the like is common.

When ultraviolet rays are used as radiation for curing the hard coat coating solution, a light source such as a high-pressure mercury lamp, a low-pressure mercury lamp, an ultra-high-pressure mercury lamp, a metal halide lamp, a carbon arc or a xenon arc is generally used.
In the case of curing using an electron beam, it is emitted from various electron beam accelerators such as Cockloft-Wald type, Bandegraf type, Resonant transformer type, Insulating core transformer type, Linear type, Dynamitron type, High frequency type etc. An electron beam having an energy of 50 to 1000 KeV, preferably 100 to 300 KeV can be used.

The thickness of the hard coat layer 2 is more effective in terms of surface hardness, and is generally more effective.
If it is less than μm, the surface hardness is significantly reduced. Therefore,
A practical film thickness range is 6 μm or more. This film thickness
It depends on the type of (meth) acrylate, which is a component of the hard coat coating solution, and the type of inorganic or organic fine particles.

The hard coat film of the present invention may be provided with a functional inorganic thin film as required. Functional inorganic thin films are constituent materials mainly composed of inorganic substances that exhibit various effects such as infrared absorption effect, infrared reflection effect, electromagnetic wave shielding effect, antistatic effect, ultraviolet absorption effect, antireflection effect, reflection enhancement effect, etc. Is a thin film formed by

The case where an antireflection thin film is formed on the surface of the hard coat layer as an example of a functional inorganic thin film will be described. This anti-reflection thin film is formed by alternately stacking a high-refractive-index thin film and a low-refractive-index thin film so as to have a predetermined optical thickness nd (product of refractive index n and thickness d). The high refractive index thin film has a refractive index (n
H) is at least 1.8, preferably at least 1.95,
When the refractive index (nL) of the low refractive index thin film is 1.6 or less, preferably 1.5 or less, a practically satisfactory antireflection effect is exhibited. Refractive index (nH) as high refractive index thin film
Is not particularly limited as long as it is 1.80 or more, but practically, titanium oxide, zirconium oxide, tantalum oxide, zinc oxide, indium oxide, cerium oxide, tin oxide, niobium oxide are used as metal oxides. , Yttrium oxide, ytterbium oxide, indium
It is formed of any of tin oxides or a mixed substance containing these as a main material. On the other hand, the low refractive index thin film is not particularly limited as long as it has a refractive index (nL) of 1.6 or less, and is formed of silicon oxide, magnesium fluoride, calcium fluoride, barium fluoride or the like.

Examples of the method for forming the functional inorganic thin film include a vacuum evaporation method, a reactive evaporation method, an ion beam assisted evaporation method,
A vacuum film forming process such as a sputtering method, an ion plating method, and a plasma CVD method may be employed, but is not particularly limited thereto.

For the purpose of imparting other various effects other than the antireflection effect, such as an infrared absorption effect, an infrared reflection effect, an electromagnetic wave shielding effect, an antistatic effect, an ultraviolet absorption effect, and a reflection enhancement effect, these various effects are provided. A functional inorganic thin film other than the anti-reflection thin film can be provided by a known and publicly-known material and a thin film forming method exhibiting the above.

[0041]

EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these examples. Parts and percentages are by weight unless otherwise specified.

Example 1 The following compositions were mixed at once to prepare a UV-curable hard coat coating solution.・ 30 parts by weight of dipentaeristol hexaacrylate ・ 5 parts by weight of diethylene glycol diacrylate ・ 2 parts by weight of Irgacure 651 (manufactured by Ciba Geigy) ・ 90 parts by weight of colloidal silica (MEK-ST average particle diameter of 10 to 20 nm manufactured by Nissan Chemical) ・ Acrylic Acid ester-based fine particles (S5002, average particle diameter 50 nm, manufactured by Nippon Paint Co., Ltd.) 4 parts by weight ・ Methyl acetate 10 parts by weight

Next, the UV-curable hard coat coating solution was applied to one side of a 150 μm-thick polyester film by a wire bar, and the solvent was evaporated to form a coating layer. Mercury lamp (120W /
(cm ² ) of ultraviolet light was applied and cured under the condition of an integrated light amount of about 400 mJ / cm ² to provide a first hard coat layer of about 12 μm.

Next, on the first hard coat layer, the thickness of the hard coat coating solution having the above composition after thermal drying was about 8.9 μm.
After coating with a wire bar so as to form a coating layer, the coating film is irradiated with ultraviolet rays from a high-pressure mercury UV lamp (120 W / cm ² ) under the condition of an integrated light quantity of about 300 mJ / cm ² and cured. A hard coat film was obtained in which two hard coat layers were provided and a hard coat layer composed of the first and second hard coat layers was provided on a plastic film.

Next, on the hard coat layer of another hard coat film obtained by the above-mentioned method, a four-layered structure having the following thin film constitutional contents (constituent material, refractive index n, shape film thickness d) is shown below. Conductive anti-reflective thin film (functional inorganic thin film)
The first and third high-refractive-index thin films are sequentially formed by a sputtering method, and the second and fourth low-refractive-index thin films are sequentially formed by a plasma-assisted vapor deposition method. A film was obtained.

<Structure of Thin Film> First layer: ITO (indium tin oxide), nH = 2.0
5, d = about 58 nm Second layer: SiO ₂ , nL = 1.46, d = about 38 nm Third layer: ITO, nH = 2.05, d = about 125 nm Fourth layer: SiO ₂ , nL = 1. 46, d = about 140 nm

The optical film thickness nd was monitored by an optical film thickness monitor, and was adjusted by stopping the film formation when the target light amount was reached. The reflectance of the obtained functionalized hard coat film was 1% or less in the wavelength range of 430 to 680 nm. The refractive index of the polyester film was 1.62.
The hard coat layer had a refractive index of 1.52 and a thickness of about 5 μm. Tables 1 and 2 show the evaluation results of the obtained hard coat fill and the functionalized hard coat film, respectively.

Example 2 The following compositions were mixed at once to prepare an ultraviolet-curable hard coat coating solution. 30 parts by weight of dipentaeristol hexaacrylate 5 parts by weight of diethylene glycol diacrylate 2 parts by weight of Irgacure 651 (manufactured by Ciba Geigy) 80 parts by weight of colloidal silica (methanol silica sol, average particle diameter 10 to 20 nm, manufactured by Nissan Chemical Co., Ltd.) Colloidal silica (MA-ST-M, average particle size 20-30 nm, manufactured by Nissan Chemical Co., Ltd.) 10 parts by weight Colloidal silica (EG-ST-ZL, average particle size 70-100 nm, manufactured by Nissan Chemical Co., Ltd.) 4 parts by weight Methyl acetate 10 parts by weight

A hard coat film and a functionalized hard coat film were obtained in the same manner as in Example 1 except that the composition of the hard coat coating solution was changed as described above. Tables 1 and 2 show the evaluation results of the obtained hard coat fill and the functionalized hard coat film, respectively.

<Comparative Example 1> A hard coat coating solution was prepared from the formulation of the hard coat coating solution described in Example 1 except that acrylate-based fine particles were removed.
In the same manner as in the above, a hard coat film and a functional imparted hard coat film were obtained. Tables 1 and 2 show the evaluation results of the obtained hard coat fill and the functionalized hard coat film, respectively.

<Comparative Example 2> A hard coat film was prepared in the same manner as in Example 1 except that fine particles were removed from the formulation of the hard coat coating solution described in Example 1 and a hard coat coating solution containing only an acrylate component was prepared. A functionalized hard coat film was obtained. Tables 1 and 2 show the evaluation results of the obtained hard coat fill and the functionalized hard coat film.
Are shown below.

<Evaluation Method> The hard coat film obtained by the above method and the hard coat film provided with the conductive antireflection function were evaluated by the following evaluation methods.

<Pencil hardness>
A hardness test was performed under a load of Kg based on a test method specified by JIS K5400, and the presence or absence of scratches was determined.

<Scratch Resistance> The surfaces of the hard coat layer and the functional inorganic thin film were rubbed 10 times with a # 0000 steel wool while applying a load of 400 g, and the occurrence of scratches was visually observed.

<Adhesion> 100 cross-hatches (squares) of 1 mm × 1 mm were put on the surface of the cured coating layer with a cutter, and a cellophane tape (manufactured by Nichiban Co., Ltd.) was stuck thereon. The evaluation was made by counting the number of squares in which the cured coating was peeled off from the film substrate.

<Curl> The test pieces of the hard coat film and the hard coat film provided with the conductive antireflection function were cut into 10 cm squares, and the curvature and radius were measured to calculate the radius of curvature.

<Crack> A hard coat film and a hard coat film having a conductive anti-reflection function were given a diameter of 3
The presence or absence of cracks when wound around a metal roll of cm was visually determined.

<Evaluation Results> The hard coat films and the functionalized hard coat films shown in Examples 1 and 2 achieve a pencil hardness of 4H, and have good adhesion, scratch resistance, curl resistance, and crack resistance. Were satisfied without any practical problems, and the balance between surface hardness and other physical properties was good.
The performance did not change even when the conductive anti-reflection thin film was provided.

On the other hand, in Comparative Example 1, the item of crack was not found, and in Comparative Example 2, the items of pencil hardness and curl were lower than those of Examples 1 and 2.

[0060]

[Table 1]

[0061]

[Table 2]

[0062]

The hard coat film of the present invention improves the adhesion between the plastic film and the hard coat layer while maintaining the surface hardness and surface smoothness of pencil hardness of 4H or more, and reduces the occurrence of cracks when bending the film. Thus, curling of the film can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing a layer structure of a hard coat film of the present invention.

[Explanation of symbols]

1. Plastic film 2. Hard coat layer 3. Radiation-curable (meth) acrylate having (meth) acryloyl group 4, 5, fine particles 7. Hard coat film

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G02B 1/10 C08L 67:00 // C08L 67:00 G02B 1/10 Z (72) Inventor Haruo Uyama Tokyo F-term (reference), 1-5-1, Taito, Tokyo, Tokyo, Japan, Toppan Printing Co., Ltd. BA10B BA10C CA23B CA23C EH46 GB41 JB14B JB14C JK12 JK12B JK12C JK15 JL11 YY00B YY00C 4J011 PA13 PA65 PA69 PA85 PA99 PB22 PC02 4J026 AA17 AA18 AA45 BA28 DB36 FA05 GA06

Claims (4)

[Claims] (1) 100 parts by weight of a radiation-curable (meth) acrylate having a (meth) acryloyl group, fine particles having a particle diameter in the range of 10 nm to 5 μm are in the range of 10 to 500.
A hard coat film in which a hard coat layer uniformly dispersed in parts by weight is provided on at least one surface of a plastic film, wherein the fine particles are two or more types, and the particle size of the fine particles for each type Are set to have substantially the same size, and the average particle diameter of one type of fine particles is at least twice the average particle size of the other type of fine particles, and the curl radius of curvature is 20 cm or more. Hard coat film. 2. The hard coat film according to claim 1, wherein the radiation-curable (meth) acrylate has three or more (meth) acryloyl groups. 3. The method according to claim 1, wherein the two or more kinds of fine particles are all inorganic fine particles, all organic fine particles, or a combination of inorganic and organic fine particles.
3. The hard coat film according to 1. 4. The hard coat film according to claim 1, wherein a functional inorganic thin film is provided on a surface of the hard coat layer.