JPH10287822A - Active energy beam-curable coating composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition which is excellent in resistance to wear, slippability and transparency, and gives a coating film capable of preventing the tight rolling of film, by formulating an organopolysiloxane unit- containing polymer, multifunctional acrylate, and a colloidal metal oxide. SOLUTION: This composition comprises (A) an organopolysiloxane unit- containing polymer, (B) a multifunctional acrylate having at least three acryloyl groups, and (C) a colloidal metal oxide dispersed in an organic solvent as dispersion medium. The component A is preferably an organopolysiloxane unit- containing polymer having a (meth)acryloyl group on its side chain. The polymer is obtained e.g. by copolymerizing an organopolysiloxane compound and glycidyl (meth)acrylate, followed by addition of (meth)acrylic acid. The component B is preferably a carboxyl group-containing multifunctional acrylate prepared by reacting a tetracarboxylic acid dianhydride with hydroxyl group-containing multifunctional acrylate having a hydroxyl group and at least three acryloyl groups.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active energy ray-curable coating composition which is cured by irradiation with an active energy ray to give a film having excellent abrasion resistance, slipperiness and transparency. .

[0002]

2. Description of the Related Art Thermoplastic resin films, such as polyester films, cellulose acetate films, acrylic resin films, polycarbonate films, and polyvinyl chloride films, are used for window-attaching films to be applied to window glasses of buildings and automobiles, touch panels for electronic materials, and the like. It is widely used as a protective film for a polarizing plate for liquid crystal, a laminate film for improving the aesthetics of housings of home electric appliances such as refrigerators, and the like. The reason why these thermoplastic resin films are used in large quantities is that they are excellent in light weight, easy processability, impact resistance, etc., but thermoplastic resin films have low surface hardness and are easily scratched, There is a disadvantage that the transparency or appearance inherent to the resin is significantly impaired.

In order to remedy this drawback, an active energy ray-curable hard coat agent for imparting abrasion resistance has been applied to the surface of these films. When the film subjected to the hard coat treatment is used for the above-mentioned window-attaching film or laminating film, since these are used in a place where they can be touched by hands, they are required to be slippery and have a good tactile sensation. Hard coat layer (film)
When the surface has slipperiness, troubles in rewinding due to tight tightening can be prevented in the step of winding or rewinding the film having the hard coat layer.

[0004] In order to impart a sliding property to the hard coat layer,
Although it is conceivable to add an organopolysiloxane compound to the hard coat agent, there is a problem that simply adding the organopolysiloxane compound causes the organopolysiloxane compound to bleed on the surface of the film and change the transparency or the surface state. Was. For this reason, it has been proposed to use a radical polymerizable resin containing an organopolysiloxane graft vinyl copolymer (Japanese Patent Application Laid-Open No. 8-283362). Could not be prevented.

[0005]

SUMMARY OF THE INVENTION The present invention relates to
An object of the present invention is to provide a hard coat agent which provides a film having excellent slipperiness and transparency and capable of preventing tightness of the film.

[0006]

According to the present invention, there is provided a polymer (A) having an organopolysiloxane unit, a polyfunctional acrylate (B) having at least three acryloyl groups in a molecule, and an organic solvent as a dispersion medium. The present invention provides an active energy ray-curable coating composition containing a colloidal metal oxide (C).

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. (A) Polymer having an organopolysiloxane unit:
The polymer having an organopolysiloxane unit as the component (A) is composed of an organopolysiloxane compound (a1) having one radical polymerizable group in one molecule or two mercapto groups in one molecule, and one polymer in one molecule. And a monomer (a ₂ ) having one radically polymerizable group.

Here, the organopolysiloxane compound having one radically polymerizable group in one molecule of the component (a1) is a radically polymerizable group such as acryl, methacryl, styryl, cinnamate, vinyl and allyl. Has one in one molecule. Among them, this and one in one molecule
Considering the easiness of copolymerization with a monomer having a radical polymerizable group, an organopolysiloxane compound having an acryl, methacryl, or styryl group is preferable.

Further, when a monomer (a2) having one radical polymerizable group in one molecule is polymerized, two monomers in one molecule introduced into the polymer through a sulfide bond by chain transfer are transferred. Organopolysiloxane compounds having a mercapto group can also be suitably used. The organopolysiloxane compound used in the present invention is usually 400 to 100,
It has a number average molecular weight of about 000, preferably 1,000 to 30,000. The organopolysiloxane unit contained in the organopolysiloxane compound (a1) is represented by the following general formula (1).

[0010]

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(Wherein R ¹ and R ² may be the same or different and are each independently an alkyl having 1 to 6 carbons or an allyl having 6 to 8 carbons, specifically preferably a methyl group Or a phenyl group, and n represents an integer of 5 or more.)

Next, the monomer (a2) having one radically polymerizable group in one molecule includes (meth) from the viewpoint of copolymerizability with the organopolysiloxane compound (a1).
Acrylic acid [(meth) acryl described in this specification means both methacryl and acryl] and (meth) acrylate are preferable. As the (meth) acrylate, for example, methyl (meth) acrylate,
Ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, benzyl (meth) acrylate, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentenyl ( Meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate, ethyl carbitol (meth) acrylate,
Butoxyethyl (meth) acrylate, cyanoethyl (meth) acrylate, glycidyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-
Hydroxypropyl (meth) acrylate and the like can be mentioned.

The above organopolysiloxane compound (a
The copolymerization of 1) and the monomer (a2) having one radically polymerizable group in one molecule is carried out in a solvent using a usual radical polymerization initiator. Examples of the solvent include aromatic hydrocarbons such as toluene and xylene, esters such as ethyl acetate, propyl acetate and butyl acetate, methyl alcohol, ethyl alcohol, n-propyl alcohol, iso-propyl alcohol and n-butyl alcohol. Alcohols, acetone, methyl ethyl ketone, methyl isobutyl ketone, ketones such as cyclohexanone, 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol, ethers such as ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether; Methoxyethyl acetate, 2-ethoxyethyl acetate, 2-methoxyethyl acetate
Ether esters such as butoxyethyl acetate; These can be used alone or in combination of two or more.

The radical polymerization initiator used in the polymerization reaction includes peroxides such as benzoyl peroxide, di-t-butyl peroxide, cumene hydroperoxide, 2,2'-azobisisobutyronitrile, ,
Azo compounds such as 2'-azobis- (2,4-dimethylvaleronitrile) and 2,2'-azobis (4-methoxy-2,4-dimethylvaleronitrile) are preferably used. The concentration of the monomer having a radical polymerizable group in the copolymerization reaction solution is usually from 10 to 60% by weight, and the polymerization initiator is usually from 0.1 to 10% by weight based on the monomer.

In the polymerization, the ratio of the raw material organopolysiloxane compound (a1) to the monomer (a2) having one radically polymerizable group in one molecule is represented by the weight ratio (a1 / a
2) In 1/99 to 50/50, preferably 5/9
5 to 40/60. If the amount of the organopolysiloxane compound is less than 1, the slipperiness and the anti-rolling property are insufficient, and if it exceeds 50, the compatibility with the polyfunctional acrylate to be blended becomes poor, and the transparency of the obtained film becomes poor.

Among the polymers (A) having an organopolysiloxane unit, by using a polymer having an organopolysiloxane unit having a (meth) acryloyl group in a side chain, the polymer (A) can be used when irradiated with active energy rays. A bond is formed between A) and the polyfunctional acrylate (B), and the resulting film has improved slipperiness and durability. A polymer having an organopolysiloxane unit having a (meth) acryloyl group in a side chain is obtained, for example, by copolymerizing an organopolysiloxane compound (a1) with glycidyl (meth) acrylate and then adding (meth) acrylic acid. It can be obtained by: Further, it can also be obtained by copolymerizing an organopolysiloxane compound and (meth) acrylic acid and then adding glycidyl (meth) acrylate. Further, an organopolysiloxane compound (a
After copolymerizing 1) with a hydroxy group (meth) acrylate such as hydroxyethyl (meth) acrylate or hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, pentaerythritol triacrylate An adduct of a (meth) acrylate having a hydroxyl group such as dipentaerythritol pentaacrylate and an isocyanate compound such as tolylene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate in a molar ratio of 1: 1, methacryloyl isocyanate,
It can also be obtained by adding 2-methacryloyloxyethyl isocyanate or the like.

(B) Polyfunctional acrylate: Examples of the polyfunctional acrylate having three or more acryloyl groups in the molecule include trimethylolpropane triacrylate, ethylene oxide-modified trimethylolpropane triacrylate, and propylene oxide-modified trimethylolpropane triacrylate. Acrylate, tris (acryloxyethyl) isocyanurate, caprolactone-modified tris (acryloxyethyl) isocyanurate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, Alkyl-modified dipentaerythritol triacrylate, alkyl-modified dipentaerythritol Lithol tetraacrylate, alkyl-modified dipentaerythritol pentaacrylate,
Caprolactone-modified dipentaerythritol hexaacrylate, carboxyl group-containing polyfunctional acrylate obtained by reacting tetracarboxylic dianhydride with a hydroxyl group-containing polyfunctional acrylate having a hydroxyl group and three or more acryloyl groups in the molecule, and these two types. A mixture of the above is mentioned.

Specific examples of the tetracarboxylic dianhydride include pyromellitic dianhydride, 3,3 ', 4,4'-benzophenonetetracarboxylic dianhydride, 4,4'-biphthalic anhydride, 4,4'-oxodiphthalic anhydride,
4,4 '-(hexafluoroisopropylidene) diphthalic anhydride, 1,2,3,4-cyclopentanetetracarboxylic dianhydride, 5- (2,5-dioxotetrahydrofuryl) -3-methyl- 3-cyclohexene-1,2
-Dicarboxylic anhydride, 4- (2,5-dioxotetrahydrofuran-3-yl) -tetralin-1,2-dicarboxylic anhydride, 3,4,9,10-perylenetetracarboxylic dianhydride, bicyclo [2.2.2] Oct-7
-Ene-2,3,5,6-tetracarboxylic dianhydride and the like. Specific examples of the hydroxyl group-containing polyfunctional acrylate having a hydroxyl group and three or more acryloyl groups in a molecule include pentaerythritol triacrylate, dipentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, and mixtures thereof. Can be

Among the polyfunctional acrylates having three or more acryloyl groups in the molecule, in particular, the reaction between tetracarboxylic dianhydride and the hydroxyl-containing polyfunctional acrylate having a hydroxyl group and three or more acryloyl groups in the molecule. By using the carboxyl group-containing polyfunctional acrylate obtained as described above, the polymer (A) having an organopolysiloxane unit of the colloidal metal oxide (C) using an organic solvent as a dispersion medium and three or more acryloyl groups are The dispersibility with respect to the polyfunctional acrylate (B) is improved, and a highly transparent coating film is obtained.

(C) Colloidal metal oxide: As the colloidal metal oxide using the organic solvent of the component (C) as a dispersion medium, the metal oxide is dispersed in the organic solvent and has an average particle diameter of 1 to 3.
A colloidal material of 100 μm, particularly 3 to 20 μm is preferably used. If a colloidal metal oxide having an average particle diameter of less than 1 μm is used, it may not be possible to prevent tightness in the hard coat treatment step.
If the thickness exceeds 0 μm, the transparency of the film may be lost. Examples of the organic solvent include methyl alcohol, ethyl alcohol, isopropyl alcohol, n-butyl alcohol, 2-ethoxyethanol, acetone, methyl ethyl ketone, toluene, and xylene.

Specific examples of such colloidal metal oxides include one or two of colloidal silica, colloidal titania, colloidal antimony oxide, colloidal zinc oxide, colloidal tin oxide, colloidal tungsten oxide, and the like. More than one species can be used. Further, mixed crystal sols such as antimony oxide / silica sol, titania / silica sol, cerium oxide / titania sol, iron oxide / titania sol, antimony oxide / titania sol, and tungsten oxide / tin oxide sol can also be used.

Optional components: The coating composition of the present invention comprises a polymer (A) having an organopolysiloxane unit, a polyfunctional acrylate (B) having three or more acryloyl groups in a molecule, and an organic solvent dispersed therein. It contains a colloidal metal oxide (C) as a medium, but does not prevent inclusion of an acrylate (D) having one or two acryloyl groups in the molecule. For example, urethane acrylate or epoxy acrylate having two acryloyl groups can be used as long as the abrasion resistance does not decrease.

When an ultraviolet ray is used as the active energy ray, a photopolymerization initiator (E) may be contained in the coating composition. Such photopolymerization initiators include benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin butyl ether, diethoxyacetophenone, benzyl dimethyl ketal,
2-hydroxy-2-methylpropiophenone, 1-hydroxycyclohexylphenyl ketone, benzophenone, 2,4,6-trimethylbenzoindiphenylphosphine oxide, 2-methyl- [4- (methylthio)
Phenyl] -2-morpholino-1-propanone, 2-
Benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one, Michler's ketone,
Examples include isoamyl N, N-dimethylaminobenzoate, 2-chlorothioxanthone, 2,4-diethylthioxanthone, and the like.

These photopolymerization initiators may be used alone or in combination of two or more. The photopolymerization initiator (E) is used in an amount of 0.1 to 0.1 parts by weight based on 100 parts by weight of the total of the polyfunctional acrylate (B) having three or more acryloyl groups in the molecule and one or two acrylates (D). It is used in a proportion of 10 parts by weight, preferably 1 to 5 parts by weight. or,
An organic solvent can be contained for the purpose of adjusting the viscosity of the coating composition and producing the polymer of the component (A). As the organic solvent, for example, the same solvent as that used when synthesizing the polymer of the component (A) can be used.

Further, the active energy ray-curable abrasion-resistant coating composition of the present invention may contain an ultraviolet absorbent (for example, a benzotriazole-based, benzophenone-based, salicylic acid-based, or cyanoacrylate-based ultraviolet absorbent) for the purpose of improving the film properties. ), An ultraviolet stabilizer (e.g., a hindered amine-based ultraviolet stabilizer), an antioxidant (e.g., a phenol-based, sulfur-based, phosphorus-based antioxidant), an anti-blocking agent, a slip agent, a leveling agent, and the like in the coating composition. 3% by weight each
Or less, preferably 1% by weight or less.

Composition: solid content 1 excluding solvent of coating composition
In 00% by weight, the polymer having the organopolysiloxane unit of the component (A) is 1 to 25% by weight, preferably 5 to 25% by weight.
20% by weight, 40 to 94% by weight, preferably 40 to 80% by weight of the trifunctional or higher polyfunctional acrylate of the component (B), and the colloidal metal oxide containing the organic solvent of the component (C) as a dispersion medium is: It is used at a ratio of 5 to 25% by weight as a metal oxide excluding the solvent. If the amount of the polymer (A) is less than 1% by weight, a film having a sufficient sliding property cannot be obtained. Also,
If it exceeds 25% by weight, the abrasion resistance of the film is reduced.
If the component (B) is less than 40% by weight, a film having good wear resistance cannot be obtained. If the amount of the component (C) is less than 5% by weight, sufficient anti-tightening property cannot be obtained.

Film formation: The coating composition of the present invention is, for example, polycarbonate, polymethyl methacrylate, polyethylene terephthalate, vinyl chloride resin and ABS.
Solvent drying and activity on plastic base materials such as resin by dipping method, flow coating method, spraying method, bar coating method, and coating method with coating machines such as gravure coating, roll coating, blade coating and air knife coating After irradiation with energy rays, 1-50
The coating can be performed under the condition that a hard coat layer of μm, preferably 1 to 20 μm is obtained. Next, as the active energy used for cross-linking and curing the applied hard coat layer, a xenon lamp, a low-pressure mercury lamp,
Activity of ultraviolet rays emitted from light sources such as high-pressure mercury lamps, ultra-high-pressure mercury lamps, metal halide lamps, carbon arc lamps, and tungsten lamps, or electron beams, α-rays, β-rays, and γ-rays normally taken out of an electron beam accelerator of 20 to 2000 kV Energy rays can be used.

[0028]

The present invention will be described in more detail with reference to the following examples. In the examples, parts and% mean parts by weight and% by weight, respectively.

(Synthesis example of polymer having organopolysiloxane unit): (Synthesis example 1) Organopolysiloxane compound having a styrene group at one end (trade name: X-2 manufactured by Shin-Etsu Chemical Co., Ltd.)
2-2440; a mixture of 30 parts of an average number molecular weight of 11,300), 70 parts of methyl methacrylate, and 150 parts of methyl ethyl ketone was heated to 80 ° C., and two hours after the temperature was raised, azobis 0.3 parts of isobutyronitrile was added and reacted at 80 ° C. for 8 hours to obtain a polymer [I] having an organopolysiloxane unit (solid content: 40%).

(Synthesis Example 2) An organopolysiloxane compound having a mercapto group at both terminals (trade name: X-22-167B, manufactured by Shin-Etsu Chemical Co., Ltd., number average molecular weight: 3,34)
0) When a mixture of 10 parts, 90 parts of methyl methacrylate, and 150 parts of methyl ethyl ketone was heated to 80 ° C. and 2 hours after the temperature was raised, 0.3 part of azobisisobutyronitrile was added. 80 ° C
For 8 hours to obtain a polymer [II] having an organopolysiloxane unit (solid content: 40%).

(Synthesis Example 3) Organopolysiloxane compound having a methacryloyl group at one end (trade name: FM0725, manufactured by Chisso Corporation, number average number molecular weight 10,000) 1
5 parts, methyl methacrylate 75 parts, 2-hydroxyethyl methacrylate 10 parts and methyl ethyl ketone 15
When 0 parts of the mixture was heated to 80 ° C. and 2 hours after the temperature was raised, 0.3 parts of azobisisobutyronitrile was added, and the mixture was reacted at 80 ° C. for 8 hours. ,
A polymer having a solid content of 40% was obtained. To this, 8 parts of methacryloyl isocyanate was added and reacted at 80 ° C. for 6 hours (the disappearance of the isocyanate group absorption at 2250 cm ⁻¹ was confirmed by infrared absorption spectrum), and the organopolysiloxane unit having a methacryloyl group in the side chain was obtained. (III) (solid content 42%) having the following formula:

(Synthesis Example 4) An organopolysiloxane compound having a styrene group at one end (manufactured by Shin-Etsu Chemical Co., Ltd.):
X-22-2440) 30 parts, methyl methacrylate 6
A mixture of 0 parts, 10 parts of 2-hydroxyethyl methacrylate and 150 parts of methyl ethyl ketone was heated to 80 ° C.
Azobisisobutyronitrile was added in an amount of 0.3 part each when the temperature was raised to 2 hours and 2 hours after the temperature was raised.
The reaction was carried out at 0 ° C. for 8 hours to obtain a copolymer having a solid content of 40%. To this, 50 parts of a compound obtained by reacting 28 parts of isophorone diisocyanate and 22 parts of 2-hydroxyethyl acrylate is added and reacted at 80 ° C. for 6 hours (extinction of absorption of isocyanate group at 2250 cm ^{−1 in} infrared absorption spectrum). Was confirmed) to obtain a polymer [IV] (solid content: 50%) having an organopolysiloxane unit having an acryloyl group in a side chain.

(Synthesis example of polymethyl methacrylate (polymer having no organopolysiloxane unit)): (for comparison) (Synthesis example 5) A mixture of 100 parts of methyl methacrylate and 150 parts of methyl ethyl ketone was heated to 80 ° C. When the temperature was raised to and after 2 hours after the temperature was raised, 0.3 parts of azobisisobutyronitrile was added, and 80 parts of azobisisobutyronitrile was added.
C. for 8 hours to obtain polymethyl methacrylate [V]
(Solid content 40%) was obtained.

(Synthesis Example of Carboxyl Group-Containing Polyfunctional Acrylate) Example 6 A mixture of dipentaerythritol hexaacrylate and dipentaerythritol pentaacrylate containing 67 mol% of dipentaerythritol pentaacrylate (manufactured by Nippon Kayaku Co., Ltd.) Kayarad DPH
A, 163 parts of hydroxyl value (69 mg KOH / g), 21.8 parts of pyromellitic dianhydride, and methyl ethyl ketone 100
And 0.1 part of hydroquinone monomethyl ether and 1 part of N, N-dimethylbenzylamine were added and reacted at 80 ° C. for 8 hours to obtain a carboxyl group-containing polyfunctional acrylate [VI] (solid content: 65%).

Examples 1 to 11 Each component was blended in the ratio shown in Table 1 to obtain an active energy ray-curable coating composition. Each active energy ray-curable coating composition was applied to a transparent 100 μm-thick biaxially stretched polyethylene terephthalate film (manufactured by Diafoil Hoechst Co., Ltd .: T100E) using a bar coater so that the film thickness after drying was 6 μm. And dried by heating at 80 ° C. for 2 minutes. This was used to obtain a power density of 120 w / cm.
Using a high-pressure mercury lamp of
The coating was formed by irradiating mJ / cm ² with ultraviolet light, and the coating was tested for transparency, abrasion resistance, slipperiness, and tightness.

Table 2 shows the evaluation results of the obtained films. In addition, each evaluation was based on the following. Transparency: evaluated by haze value (H%) (haze value = Td / T)
t × 100, Td: scattered light transmittance, Tt: total light transmittance JIS K7105). Abrasion resistance: A 100-rotation Taber abrasion test was carried out using a CS-10F abrasion wheel manufactured by Caliberase under a load of 500 g and evaluated by the difference ΔH% between the haze value after the Taber abrasion test and the haze value before the Taber abrasion test ( Taber abrasion test method ASTM D1044).

Sliding property: After the evaluation sample was left in a constant temperature room at a relative humidity of 60% for 24 hours, the static friction coefficient and the dynamic friction coefficient were measured using a slip tester (friction coefficient test method JIS K7125). Winding tightness: The coating composition application surface and the back surface (unprocessed surface) of the biaxially stretched polyethylene terephthalate film overlap,
The tightness was evaluated based on whether or not the film moved when rubbed firmly. Moving (no winding tightness): ○ Not moving (with winding tightness): × The biaxially stretched polyethylene terephthalate film as the substrate has a transparency of 3%, abrasion resistance of 28.5%, and a static friction coefficient of 0. 50 and the coefficient of kinetic friction were 0.48.

Comparative Examples 1 to 4 The active energy ray-curable coating compositions obtained by blending the respective components in the proportions shown in Table 1 were tested in the same manner as in Example 1, and the evaluation results are shown in Table 3. Was.

[0039]

[Table 1]

[0040]

[Table 2]

[0041]

[Table 3]

[0042]

[Table 4]

[0043]

The active energy ray-curable coating composition of the present invention provides a film having excellent transparency, abrasion resistance, slipperiness and tightness. In particular, as a polymer having an organopolysiloxane unit as the component (A), (meth)
When a polymer having an acryloyl group is used, a film excellent in durability with little change in slip properties (static friction coefficient, dynamic friction coefficient) even after a wet heat resistance test is obtained.

Claims (4)

[Claims] 1. A polymer (A) having an organopolysiloxane unit, a polyfunctional acrylate (B) having three or more acryloyl groups in a molecule, and a colloidal metal oxide containing an organic solvent as a dispersion medium (1). An active energy ray-curable coating composition containing C). 2. The active energy ray-curable coating composition according to claim 1, wherein the polymer (A) having an organopolysiloxane unit is a polymer having a (meth) acryloyl group in a side chain. 3. A polyfunctional acrylate (B) having three or more acryloyl groups in a molecule is a tetracarboxylic dianhydride and a hydroxyl group-containing polyfunctional acrylate having a hydroxyl group and three or more acryloyl groups in a molecule. The active energy ray-curable coating composition according to claim 1, which is a carboxyl group-containing polyfunctional acrylate obtained by reacting 4. In the coating composition, component (A) is 1 to 25% by weight, component (B) is 40 to 94% by weight, and component (C) is 5% by weight.
The coating composition according to claim 1, wherein the coating composition is contained in an amount of about 25% by weight.