JP2013095108A - Hard coat film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hard coat film having high adhesion to base material as well as having excellent skin hardness, excellent in curl resistance, and excellent in blocking resistance.SOLUTION: In the hard coat film 1, a hard coat layer 3 is provided on a transparent base material film 2, and the hard coat layer is formed of composition including a multifunction acrylic monomer (A), a multifunction urethane acrylate oligomer (B), a photo-radical polymerization initiator (C), and inorganic fine particles (D). After the polymerization reaction, a ratio of P1/P2 between carbon double bonded infrared spectrum peak P1 and carbon-oxygen double bonded infrared spectrum P2 contained in (A) and (B) is set to be 0.100-0.200. In the total of (A) and (B), an adding amount of (B) is 40-60 wt.%, an adding amount of (C) is 0.01-15 wt.%, thickness of the hard coat layer is 5-7 μm, a particle diameter of (D) is 40-80 nm, and an adding amount of (D) is 10-30 wt.% of the entire solid content.

Description

  The present invention is a hard coat used for the purpose of protecting the surface of a display such as a cathode ray tube display (CRT), a liquid crystal display (LCD), a plasma display panel (PDP), or a field emission display (FED). It relates to film. More specifically, the present invention relates to a hard coat film having excellent surface hardness, high adhesion to a substrate, excellent curl resistance, and excellent blocking resistance.

  A protective film for a circularly polarizing plate used for a polarizing plate protective film for a liquid crystal display, an organic EL display, or the like has a resin layer formed to have various functions. For example, an antistatic layer for providing an antistatic function, an antireflection layer for suppressing reflection, and a hard coat layer for improving surface hardness. In particular, the hard coat layer is indispensable for display applications, and is not only used as a single hard coat layer but also serves as a lower layer of an antireflection layer, which is an important technique.

  For example, Patent Document 1 discloses a thermoplastic norbornene-based material having a silicone-based hard coat layer having an adhesion in a cross-cut peel test of 50 or more in 100 on the surface of a substrate formed of a thermoplastic norbornene-based resin. A molded article made of a resin is disclosed, and Patent Document 2 is formed from a coating film component containing one or more organic components having a polymerizable functional group and an inorganic filler, and at least one of the organic components is A hard coat film for a plastic substrate film characterized by not having a hydrogen bond-forming group is disclosed. Patent Document 3 discloses a hard coat film which is a cured coating film layer on at least one surface of a transparent plastic film substrate. A hard coat film having a layer, wherein the hard coat layer forming material is a polyfunctional urethane acrylate (A), isocyanuric acid acrylate (B And a hard coat film characterized by containing inorganic ultrafine particles (C). Patent Document 4 discloses a polyfunctional (meth) acrylic monomer (A) and a (meth) acrylic monomer having a hydroxyl group (B). ), A radical photopolymerization initiator (C), and a blocked isocyanate compound (D) that generates an isocyanate group by heat treatment, a hard coat film using a hard coat layer forming composition is disclosed.

Japanese Unexamined Patent Publication No. 7-97468 JP 2000-159916 A JP 2006-106427 A JP 2008-231163 A

  In recent years, a demand for increasing the hardness of a hard coat film provided with a hard coat layer as a protective function of the polarizing plate has been very high. However, cellulose ester films are mainly used as the hard coat film substrate for the protective film of these polarizing plates, but since this film substrate is soft, it is very difficult to increase the hardness as a hard coat film. is there.

  In order to achieve high hardness, a polyfunctional monomer is often used, and there is a problem that curing shrinkage occurs during polymerization and the film itself is extremely curled. The extreme curl of the hard coat film is a factor that deteriorates workability at the time of bonding to the polarizing plate. The hard coat film is processed by a roll-to-roll coating process and stored in a roll state. Blocking may occur during this storage. Prevents blocking by adding water repellent as a blocking measure to give the hard coat film interface slip, or adding fine particles to create a physical space at the hard coat film interface. There are many cases. However, when the slip property of the hard coat film interface is improved, it becomes difficult to recoat on the hard coat or cause roll misalignment. Further, the addition of fine particles tends to increase the haze of the hard coat layer, which can be a factor in reducing the permeability. When using an additive, it is necessary to optimize the addition amount.

  An object of the present invention is to provide a hard coat film having excellent surface hardness, high adhesion to a substrate, excellent curl resistance, and excellent blocking resistance.

  In order to achieve the above object, the present invention takes the following measures.

That is, the invention according to claim 1 is a hard coat film in which a hard coat layer is provided on a transparent substrate film,
The hard coat layer is formed from a composition containing a polyfunctional acrylic monomer (A), a polyfunctional urethane acrylate oligomer (B), a photo radical polymerization initiator (C), and inorganic fine particles (D). The ratio P1 / P2 of the infrared spectroscopic peak P1 of the C═C carbon double bond and the infrared spectroscopic spectrum P2 of the C═O carbon-oxygen double bond contained in the (A) and (B) is 0. 100 or more and 0.200 or less,
The addition amount of the polyfunctional urethane acrylate oligomer (B) is 40 to 60% by weight based on the total of the polyfunctional acrylic monomer (A) and the polyfunctional urethane acrylate oligomer (B),
The addition amount of the radical photopolymerization initiator (C) is 0.01 to 15% by weight based on the total of the polyfunctional acrylic monomer (A) and the polyfunctional urethane acrylate oligomer (B),
The hard coat layer is 5 to 7 μm,
A hard coat film, wherein the inorganic fine particles (D) have a particle size of 40 nm to 80 nm, and the added amount of the inorganic fine particles (D) is 10 to 30% by weight based on the total solid content. .

  According to the present invention, it is possible to provide a hard coat film having excellent surface hardness, high adhesion to a substrate, excellent curl resistance, and excellent blocking resistance.

It is sectional drawing for demonstrating one Embodiment of the hard coat film of this invention.

  Hereinafter, embodiments of the present invention will be described in detail. In addition, the composition containing the following (A)-(D) component which forms the hard-coat layer of this invention is called a composition for hard-coat layer formation.

  The polyfunctional acrylic monomer (A) used in the present invention includes polyester acrylate, urethane acrylate, epoxy acrylate, polyether acrylate, etc., including those in which a reactive acrylic group is bonded to an acrylic resin skeleton, Moreover, what combined the acrylic group to rigid skeletons, such as a melamine and an isocyanuric acid, can be used. Moreover, these monomers can be used 1 type or in mixture of 2 or more types. Preferable is pentaerythritol triacrylate or dipentaerythritol pentaacrylate.

  In the present invention, “acrylic monomer” also refers to “methacrylic monomer”. For example, “polyfunctional acrylic monomer” refers to both “polyfunctional methacrylic monomer”.

  The polyfunctional urethane acrylate oligomer (B) preferred in the present invention is generally easily formed by reacting a polyester polyol with an isocyanate monomer or a product obtained by reacting a prepolymer with an acrylate monomer having a hydroxyl group. Can be mentioned.

  Specific examples include pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate hexamethylene diisocyanate urethane prepolymer, pentaerythritol triacrylate toluene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate toluene diisocyanate urethane prepolymer. Pentaerythritol triacrylate isophorone diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate isophorone diisocyanate urethane prepolymer, and the like can be used.

  Commercially available polyfunctional acrylic monomers (A) include Mitsubishi Rayon Co., Ltd. (trade name “Diabeam” series, etc.), Nagase ChemteX Corporation (trade name “Denacol” series, etc.), Shin-Nakamura Chemical Co., Ltd. (Product name “NK Ester” series, etc.), Dainippon Ink and Chemicals, Inc .; (Product name “UNIDIC” series, etc.), Toa Gosei Co., Ltd. (product name “Aronix” series, etc.), Nippon Oil & Fats Co., Ltd. (Trade name “Blemmer” series, etc.), Nippon Kayaku Co., Ltd .; (trade name “KAYARAD” series, etc.), Kyoeisha Chemical Co., Ltd .; (trade names “light ester” series, “light acrylate” series, etc.) The product can be used.

  As the commercially available polyfunctional urethane acrylate oligomer (B), Kyoeisha Chemical Co., Ltd .; UA-306H, UA-306T, UA-306I, etc., Nippon Synthetic Chemical Industry Co., Ltd .; UV-1700B, UV-6300B, UV- 7600B, UV-7605B, UV-7640B, UV-7650B, etc., Shin-Nakamura Chemical Co., Ltd .; U-4HA, U-6HA, UA-100H, U-6LPA, U-15HA, UA-32P, U-324A, etc. Daicel UCB Co., Ltd .; Ebecryl-1290, Ebecryl-1290K, Ebecryl-5129, etc., Negami Kogyo Co., Ltd .; UN-3220HA, UN-3220HB, UN-3220HC, UN-3220HS, etc. can be used.

  The use ratio of the polyfunctional urethane acrylate oligomer (B) is preferably 40 to 60% by weight with respect to the total of the polyfunctional acrylic monomer (A) and the polyfunctional urethane acrylate oligomer (B). When the usage ratio of the polyfunctional urethane acrylate oligomer (B) is less than 40% by weight, the polyfunctional acrylic monomer (A) may cause inconvenience such as large curling of the film on the cured coating side due to curing shrinkage. There is. Moreover, when the usage-amount of the said polyfunctional urethane acrylate oligomer (B) exceeds 60 weight%, it may be insufficient at the point of obtaining the hard-coat layer which has sufficient hardness, The hard-coat layer formed May cause inconveniences such as a reduction in pencil hardness.

  The photo radical polymerization initiator (C) used in the present invention is preferably a compound that generates radicals by irradiating ionizing radiation and initiates a polymerization reaction of a polyfunctional acrylic monomer.

  Specific examples of the photoradical polymerization initiator (C) include acetophenone, 2,2-diethoxyacetophenone, p-dimethylacetophenone, p-dimethylaminopropiophenone, benzophenone, 2-chlorobenzophenone, 4,4 ′. -Dichlorobenzophenone, 4,4'-bisdiethylaminobenzophenone, Michler's ketone, benzyl, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, p-isopropyl-α-hydroxyisobutylphenone, α-hydroxyisobutylphenone, 2,2 -Carbonyl compounds such as dimethoxy-2-phenylacetophenone and 1-hydroxycyclohexyl phenyl ketone, tetramethylthiuram monosulfide, tetramethylthiuramdisulfur And sulfur compounds such as thioxanthone, 2-chlorothioxanthone and 2-methylthioxanthone can be used. These photopolymerization initiators may be used alone or in combination of two or more.

  The usage-amount of the radical photopolymerization initiator (C) of this invention is 0 with respect to the sum total of the said polyfunctional acrylic monomer (A) of the composition for hard-coat layer formation, and the said polyfunctional urethane acrylate oligomer (B). 0.01 to 15% by weight is suitable. When the amount is less than 0.01% by weight, a sufficient curing reaction does not proceed when the ionizing radiation is irradiated. When the amount exceeds 15% by weight, the ionizing radiation cannot reach the lower part of the hard coat layer sufficiently.

  Examples of the inorganic fine particles (D) of the present invention include metal fluorine fine particles such as silica, aluminum oxide, zirconia, titania, zinc oxide, germanium oxide, indium oxide, tin oxide, and indium tin oxide (ITO) sodium. Metal fine particles, metal sulfide fine particles, metal nitride fine particles and the like can be used.

  From the viewpoint of high hardness, silica and aluminum oxide are preferable. Further, in order to obtain a relatively high refractive index layer, fine particles having a high refractive index when a film such as zirconia, titania or antimony oxide is formed can be appropriately selected and used. Similarly, in order to obtain a relatively low refractive index layer, fluoride fine particles such as magnesium fluoride and sodium fluoride, and fine particles having a low refractive index during film formation such as hollow silica fine particles are appropriately selected and used. be able to. Furthermore, when it is desired to impart antistatic properties and conductivity, indium tin oxide (ITO), tin oxide, or the like can be appropriately selected and used. These can be used alone or in combination of two or more.

  The particle size of the inorganic fine particles (D) of the present invention is 40 nm to 80 nm, and the amount used is preferably 10 to 30% by weight based on the total solid content of the composition for forming a hard coat layer. When the amount used is 40 nm and less than 10%, the surface unevenness is insufficient and blocking occurs. When the particle size exceeds 80 nm and 30%, the surface unevenness increases, so that the haze increases or the adhesion with the substrate decreases.

  As a kind of the solvent of the composition for forming a hard coat layer, the kind such as ester, ketone, ether, alcohol, and aromatic hydrocarbon is not particularly limited, but the boiling point is 50 ° C. or more and 120 ° C. or less. Things are desirable. Specifically, methyl acetate, ethyl acetate, isobutyl acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, methanol, ethanol, isopropyl alcohol, isobutanol, 1-butanol, tetrahydrofuran, 1,3-dioxolane, n-hexane, cyclohexane, Toluene or the like can be used. Note that the solvent is not limited to one type, and may be a mixed solvent as long as a plurality of solvents are mixed and within the above boiling point range.

If the boiling point of the solvent is less than 50 ° C., it will volatilize at room temperature, and it will be difficult to form a uniform hard coat layer due to an increase in viscosity. Further, since the evaporation rate is high, the substrate cannot be sufficiently dissolved, and the adhesion between the hard coat layer and the substrate is lowered.
On the other hand, if the boiling point of the solvent exceeds 120 ° C., it is difficult to sufficiently evaporate the solvent in the drying process, and it remains as a residual solvent in the hard coat layer, resulting in a reduction in pencil hardness. Result.

  In the present invention, as a modifier for the hard coat layer, a coating property improver, an antifoaming agent, a thickener, an antistatic agent, an organic lubricant, an organic polymer compound, an ultraviolet absorber, a light stabilizer, and a dye , Pigments or stabilizers can be used, and these are used as a composition component of the coating layer constituting the hard coat layer within a range not impairing the reaction due to actinic radiation. It can be improved.

  In the present invention, the method for curing the hard coat layer forming composition is preferably a method of irradiating actinic rays, particularly ultraviolet rays. When these methods are used, the hard coat layer forming composition is used. The product can be cured by ultraviolet irradiation by adding a radical photopolymerization initiator. In the ultraviolet irradiation, light having a wavelength of 400 nm or less may be used. For example, an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a medium pressure mercury lamp, a low pressure mercury lamp, a xenon lamp, a halogen lamp, or the like can be used. Moreover, you may add a heating process as needed.

  In the composition for forming a hard coat layer used in the present invention, thermal polymerization such as hydroquinone, hydroquinone monomethyl ether or 2,5-t-butyl hydroquinone is used to prevent thermal polymerization during production and dark reaction during storage. It is desirable to add an inhibitor. The addition amount of the thermal polymerization inhibitor is preferably 0.005 to 0.05% by weight with respect to the solid content of the composition for forming a hard coat layer.

  The composition for forming a hard coat layer of the present invention can be made into a hard coat film by coating on a substrate to form a hard coat layer.

  As a method for applying the hard coat layer forming composition, the hard coat layer forming composition may be applied using a known coating means such as a bar coater, applicator, doctor blade, roll coater, die coater, and comma coater. Can do.

  As a base material, the film-form thing which has translucency is preferable, and should just have moderate transparency and mechanical strength as a base material. For example, polyethylene terephthalate (PET), cellulose triacetate (TAC), diacetyl cellulose, acetyl cellulose butyrate, polyethylene naphthalate (PEN), cycloolefin polymer, polyimide, polyethersulfone (PES), polymethyl methacrylate (PMMA), A film such as polycarbonate (PC) can be used. Among them, when a hard coat film is provided on the front surface of the liquid crystal display, cellulose triacetate (TAC) is preferably used because it has no optical anisotropy.

The present invention provides a hard coat film having high adhesion to a substrate, excellent curl resistance, excellent blocking resistance, and excellent surface hardness.
FIG. 1 shows a cross-sectional view for explaining one embodiment of the hard coat film of the present invention. In the hard coat film 1 of the present invention, the hard coat layer 3 is applied to the transparent base film 2 and formed. The inorganic fine particles 4 are present in the hard coat layer 3. The surface unevenness due to the inorganic fine particles is preferably 30 nm or more in terms of Ra value. When it is less than 30 nm, blocking occurs.

  As the production process of the hard coat film 1, the composition for forming a hard coat layer is applied to the transparent base film 2 through a drying process and a curing process. In this invention, it is preferable that the drying temperature in the step of the drying process in a preparation process is 50 degreeC or more and 100 degrees C or less.

  When the drying temperature is increased, the evaporation rate is increased, so that the solvent cannot sufficiently dissolve the surface of the transparent substrate film, and as a result, the adhesion between the hard coat layer and the transparent substrate film is lowered. On the other hand, if the drying temperature is increased too much, it will exceed the softening temperature of the transparent substrate film, which may cause substrate deformation, wrinkles and the like.

On the other hand, when the drying temperature is lowered, the dissolution rate of the transparent base film of the solvent is improved, so that the adhesion between the hard coat layer 3 and the transparent base film 2 is improved. A decrease in the surface hardness of the hard coat layer 3 occurs due to a decrease in the thickness of the portion.

  From the above results, the drying temperature in the drying step when producing the hard coat film through the steps of applying, drying, and curing the hard coat layer forming composition of the present invention to the transparent substrate film is 50 ° C. or higher and 100 ° C. The following is preferred.

  Although the film thickness of the hard coat layer 3 obtained by coating is determined by the required hardness, it is preferably 5 to 7 μm. When the film thickness is less than 5 μm, sufficient hardness cannot be obtained. On the other hand, when the film thickness exceeds 7 μm, the base material is extremely curled due to curing shrinkage of the hard coat layer, and problems such as breakage occur in the next process.

  After the hard coat layer 3 is polymerized and cured, the infrared spectrum P1 of the carbon-carbon C—C double bond contained in the polyfunctional acrylic monomer (A) and the polyfunctional urethane acrylate oligomer (B) and the carbon-oxygen C The ratio P1 / P2 of the infrared spectral spectrum P2 of the —O double bond is preferably 0.100 to 0.200. If it is less than 0.100, curling becomes severe due to the curing shrinkage reaction, and if it exceeds 0.200, the surface hardness of the hard coat layer decreases.

  The value of P1 can be adjusted by adjusting the integrated light quantity such as ionizing radiation and ultraviolet rays. The P1 and P2 can be easily calculated by a conventionally known method and apparatus.

  The hard coat film 1 of the present invention is provided with a functional layer as necessary. The functional layer is provided between the transparent substrate film 2 and the hard coat layer 3, on the surface of the transparent substrate film 2 on the side where the hard coat layer 3 is not provided, and on the upper surface of the hard coat layer 3. Examples of these functional layers include an antireflection layer, an antistatic layer, an antiglare layer, an electromagnetic wave shielding layer, an infrared absorption layer, an ultraviolet absorption layer, and a color correction layer. These functional layers may be a single layer or a plurality of layers. A hard coat film in which a hard coat layer is formed on a transparent base film and a hard coat film provided with these functional layers are bonded to various display surfaces such as a liquid crystal display, a plasma display, and a CRT display. Therefore, it is possible to provide a display having excellent scratch resistance and antifouling properties.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. However, the present invention is not limited by the following description.
<Evaluation method>
(Infrared spectroscopic spectral ratio P1 / P2 value evaluation)
Measurement was carried out by ATR method using JASCO (Jasco) FT / IR-610.
Prism: Germanium Integration count: 60 times Decomposition: 4 cm ^-1
C = C double bond P1 range: 1683.66 to 1781.9 cm ⁻¹
C = O double bond P2 range: 1374.03-1427.07 cm < ^-1 >
Under the above conditions, the ratio P1 / P2 between the peak top of P1 and the peak top of P2 was determined.
(Haze value evaluation)
Measurement was carried out according to JIS-K7105 using NDH-2000 manufactured by Nippon Denshoku.
The target Haze value was 0.3% or less.
(Total light transmittance evaluation)
Measurement was carried out according to JIS-K7105 using NDH-2000 manufactured by Nippon Denshoku.
The total light transmittance was a target value of 91% or more.
(Pencil hardness evaluation)
Evaluation was performed according to JIS 5600-5-4 (1999).
The target pencil height was 3H or higher.
(Adhesion evaluation)
After irradiating the hard coat surface with 65 mW / cm ² for 6 h UV light using an ISUPAKI Electric Eye Super UV tester, a 10 × 10 square cross-cut peel test was performed to confirm whether the hard coat layer was peeled off.
The target was not to peel in 100 squares (100/100).
(Blocking evaluation)
The produced hard coat film is made into 10 cm square, and five sheets are overlapped. Scissors are heated at 120 ° C. for 120 min with glass of 25 cm × 25 cm × 0.7 mmt. Thereafter, the area ratio causing blocking in the 10 cm square of the hard coat film was observed.
The blocking area ratio was set to 10% or less.
(Curl evaluation)
The produced hard coat film is cut into 2 mm × 50 mm in the TD direction. The radius of curvature (mm) at this time was measured (TD curl).
The target was a radius of curvature of 15 mm or more.

<Example 1>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Multifunctional acrylic monomer: PE-3A (pentaerythritol triacrylate (PETA), Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (DPU-2) (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Irg184) (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: ELCOM TP1416SIV (silica fine particles) (Catalyst Chemical Industries) Particle size 80 nm 20 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The coating solution obtained by stirring and mixing was applied to a cured film thickness of 5 μm by a bar coating method, dried at 50 ° C., and irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was set to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement. In Table 1, the amounts used of the components (A) and (B) are weight% with respect to the total of the components (A) and (B), and the amount of the component (C) used is the amount (A) and ( B)% by weight relative to the total of components, and the amount of component (D) used is% by weight relative to the total solid content of the hard coat forming composition.

<Example 2>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: ELCOM TP1416SIV (Catalytic Chemical Industry) Particle size 80 nm 20 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The mixed coating solution was applied by a bar coating method so as to have a cured film thickness of 5 μm, dried at 50 ° C., irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was set to 0.2. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Example 3>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 60 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 40 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: ELCOM TP1416SIV (Catalytic Chemical Industry) Particle size 80 nm 20 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The coating solution obtained by stirring and mixing was applied by a bar coating method so as to have a cured film thickness of 5 μm, dried at 50 ° C., irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was set to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Example 4>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 0.01 parts by weight
Inorganic fine particles: ELCOM TP1416 SIV (Catalytic Chemical Industry) particle size 80 nm 20 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The coating solution obtained by stirring and mixing was applied by a bar coating method so as to have a cured film thickness of 5 μm, dried at 50 ° C., irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was set to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Example 5>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 15 parts by weight
Inorganic fine particles: ELCOM TP1416 SIV (Catalytic Chemical Industry) particle size 80 nm 20 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The coating solution obtained by stirring and mixing was applied by a bar coating method so as to have a cured film thickness of 5 μm, dried at 50 ° C., irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was set to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Example 6>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: ELCOM TP1416 SIV (Catalytic Chemical Industry) particle size 40 nm 10 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The coating solution obtained by stirring and mixing was applied by a bar coating method so as to have a cured film thickness of 5 μm, dried at 50 ° C., irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was set to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Example 7>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: ELCOM TP1416 SIV (Catalytic Chemical Industry) particle size 40 nm 30 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The coating solution obtained by stirring and mixing was applied by a bar coating method so as to have a cured film thickness of 5 μm, dried at 50 ° C., irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was set to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Example 8>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: ELCOM TP1416 SIV (Catalytic Chemical Industry) particle size 80 nm 10 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The coating solution obtained by stirring and mixing was applied by a bar coating method so as to have a cured film thickness of 5 μm, dried at 50 ° C., irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was set to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Example 9>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: ELCOM TP1416 SIV (Catalytic Chemical Industry) particle size 80 nm 30 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The coating solution obtained by stirring and mixing was applied by a bar coating method so as to have a cured film thickness of 5 μm, dried at 50 ° C., irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was set to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Example 10>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: ELCOM TP1416 SIV (Catalytic Chemical Industry) particle size 80 nm 20 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The coating solution obtained by stirring and mixing was applied by a bar coating method so as to have a cured film thickness of 7 μm, dried at 50 ° C., irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was set to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Comparative Example 1>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: ELCOM TP1416 SIV (Catalytic Chemical Industry) particle size 80 nm 20 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The mixed coating solution was applied by a bar coating method so as to have a cured film thickness of 5 μm, dried at 50 ° C., irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was reduced to 0.08. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Comparative example 2>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: ELCOM TP1416 SIV (Catalytic Chemical Industry) particle size 80 nm 20 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The mixed coating solution was applied by a bar coating method so as to have a cured film thickness of 5 μm, dried at 50 ° C., irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was reduced to 0.25. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Comparative Example 3>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 80 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 20 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: ELCOM TP1416 SIV (Catalytic Chemical Industry) particle size 80 nm 20 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The coating solution obtained by stirring and mixing was applied to a cured film thickness of 5 μm by a bar coating method, dried at 50 ° C., and irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was set to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Comparative example 4>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 20 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 80 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: ELCOM TP1416 SIV (Catalytic Chemical Industry) particle size 80 nm 20 parts by weight
Solvent: Ethyl acetate (boiling point 77 ° C.) 100 parts by weight of stirring and mixing coating solution was applied to a cured film thickness of 5 μm by the bar coating method, dried at 50 ° C., and irradiated with ultraviolet rays from a metal halide lamp. The hard coat layer was formed so that the value of P1 / P2 was 0.1.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Comparative Example 5>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 0.005 parts by weight
Inorganic fine particles: ELCOM TP1416 SIV (Catalytic Chemical Industry) particle size 80 nm 20 parts by weight
Solvent: Ethyl acetate (boiling point 77 ° C.) 100 parts by weight of stirring and mixing coating solution was applied to a cured film thickness of 5 μm by the bar coating method, dried at 50 ° C., and irradiated with ultraviolet rays from a metal halide lamp. The hard coat layer was formed so that the value of P1 / P2 was 0.1.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Comparative Example 6>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical Co., Ltd.) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 20 parts by weight Inorganic fine particles: ELCOM TP1416 SIV (Catalytic Chemical Industry) Particle size 80 nm 20 parts by weight
Solvent: Ethyl acetate (boiling point 77 ° C.) 100 parts by weight of stirring and mixing coating solution was applied to a cured film thickness of 5 μm by the bar coating method, dried at 50 ° C., and irradiated with ultraviolet rays from a metal halide lamp. The hard coat layer was formed so that the value of P1 / P2 was 0.1.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Comparative Example 7>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: MEK-ST-L (Nissan Chemical Industries) particle size 40 nm, 5 parts by weight
Solvent: Ethyl acetate (boiling point 77 ° C.) 100 parts by weight of stirring and mixing coating solution was applied to a cured film thickness of 5 μm by the bar coating method, dried at 50 ° C., and irradiated with ultraviolet rays from a metal halide lamp. The hard coat layer was formed so that the value of P1 / P2 was 0.1.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Comparative Example 8>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical Co., Ltd.) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight Inorganic fine particles: MEK-ST-L (Nissan Chemical Industries) particle size 40 nm 35 parts by weight
Solvent: Ethyl acetate (boiling point 77 ° C.) 100 parts by weight of stirring and mixing coating solution was applied to a cured film thickness of 5 μm by the bar coating method, dried at 50 ° C., and irradiated with ultraviolet rays from a metal halide lamp. The hard coat layer was formed so that the value of P1 / P2 was 0.1.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Comparative Example 9>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: ELCOM TP1416 SIV (Catalytic Chemical Industry) particle size 80 nm 5 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The coating solution obtained by stirring and mixing was applied to a cured film thickness of 5 μm by a bar coating method, dried at 50 ° C., and irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was set to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Comparative Example 10>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: ELCOM TP1416 SIV (Catalytic Chemical Industry) particle size 80 nm 35 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The coating solution obtained by stirring and mixing was applied to a cured film thickness of 5 μm by a bar coating method, dried at 50 ° C., and irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was set to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Comparative Example 11>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: (Catalyst Chemical Industry) Particle size 20 nm 10 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The coating solution obtained by stirring and mixing was applied to a cured film thickness of 5 μm by a bar coating method, dried at 50 ° C., and irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was set to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Comparative Example 12>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: (Catalyst Chemical Industry) Particle size 20 nm 30 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The coating solution obtained by stirring and mixing was applied to a cured film thickness of 5 μm by a bar coating method, dried at 50 ° C., and irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was set to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Comparative Example 13>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: MEK-ST-ZL (Nissan Chemical Industries) particle size 100 nm 10 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The coating solution obtained by stirring and mixing was applied to a cured film thickness of 5 μm by a bar coating method, dried at 50 ° C., and irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was set to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Comparative example 14>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: MEK-ST-ZL (Nissan Chemical Industries) particle size 100 nm 30 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The coating solution obtained by stirring and mixing was applied to a cured film thickness of 5 μm by a bar coating method, dried at 50 ° C., and irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was set to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Comparative Example 15>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: MEK-ST-ZL (Nissan Chemical Industries) particle size 80 nm 10 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The mixed coating solution was applied by a bar coating method so as to have a cured film thickness of 4 μm, dried at 50 ° C., irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was reduced to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

<Comparative Example 16>
Using a cellulose triacetate film substrate with a thickness of 40 μm,
Polyfunctional acrylic monomer: PE-3A (pentaerythritol triacrylate, Kyoeisha Chemical) 40 parts by weight
Polyfunctional urethane acrylate oligomer: UA-306H (Kyoeisha Chemical) 60 parts by weight Initiator: Irgacure 184 (Ciba Specialty Chemicals) 10 parts by weight
Inorganic fine particles: MEK-ST-ZL (Nissan Chemical Industries) particle size 80 nm 10 parts by weight
Solvent: 100 parts by weight of ethyl acetate (boiling point 77 ° C.)
The mixed coating solution was applied by a bar coating method so as to have a cured film thickness of 8 μm, dried at 50 ° C., and irradiated with ultraviolet rays by a metal halide lamp, and the value of P1 / P2 was reduced to 0.1. A hard coat layer was formed.
Table 1 summarizes the results of haze, total light transmittance, pencil hardness, adhesion, blocking, and radius of curvature measurement.

  From Examples 1 and 2 and Comparative Examples 1 and 2, a desired hard coat film can be obtained if P1 / P2 is in the range of 0.1 to 0.2.

  If the usage-amount of a polyfunctional urethane acrylate oligomer is 40 to 60 weight% from Examples 1, 3 and Comparative Examples 3 and 4, a desired hard coat film can be obtained.

  From Examples 4 and 5 and Comparative Examples 5 and 6, the use amount of the radical photopolymerization initiator is 0.01 to 15% by weight based on the total of the polyfunctional acrylic monomer (A) and the polyfunctional urethane acrylate oligomer (B). If desired, a desired hard coat film can be obtained.

  From Examples 6 to 9 and Comparative Examples 7 to 14, if the particle size of the inorganic fine particles (D) is 40 nm to 80 nm and the addition amount is 10 to 30% by weight based on the total solid content, the desired hard coat film Can be obtained.

  From Examples 1 and 12 and Comparative Examples 15 and 16, a desired hard coat film can be obtained if the hard coat layer is 5 to 7 μm.

  According to the present invention, it is possible to protect a display surface by providing a hard coat film having excellent surface hardness, high adhesion to a substrate, excellent curl resistance, and excellent blocking resistance. It has sufficient hardness as a film, can eliminate the workability deterioration in the polarizing plate bonding step, and can improve the yield.

DESCRIPTION OF SYMBOLS 1 ... Hard coat film 2 ... Transparent base film 3 ... Hard coat layer 4 ... Inorganic fine particle

Claims (1)

A hard coat film provided with a hard coat layer on a transparent substrate film,
The hard coat layer is formed from a composition containing a polyfunctional acrylic monomer (A), a polyfunctional urethane acrylate oligomer (B), a photo radical polymerization initiator (C), and inorganic fine particles (D). The ratio P1 / P2 of the infrared spectroscopic peak P1 of the C═C carbon double bond and the infrared spectroscopic spectrum P2 of the C═O carbon-oxygen double bond contained in the (A) and (B) is 0. 100 or more and 0.200 or less,
The addition amount of the polyfunctional urethane acrylate oligomer (B) is 40 to 60% by weight based on the total of the polyfunctional acrylic monomer (A) and the polyfunctional urethane acrylate oligomer (B),
The addition amount of the radical photopolymerization initiator (C) is 0.01 to 15% by weight based on the total of the polyfunctional acrylic monomer (A) and the polyfunctional urethane acrylate oligomer (B),
The hard coat layer is 5 to 7 μm,
A hard coat film, wherein the inorganic fine particles (D) have a particle size of 40 nm to 80 nm, and the inorganic fine particles (D) are added in an amount of 10 to 30% by weight based on the total solid content.

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