JP2002067238A - Film having cured coat of radiation-cured type resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film having a cured coat of a radiation-cured type resin composition which is cured by radiation and excellent in the adhesion to plastics and which enables thick-film coating with low curling and is free of cracking and suitable for a hard coat. SOLUTION: The film has a cured coat layer of a radiation-cured type resin composition which contains a multifunctional urethane acrylate (A) obtained from the reaction of a radiation-cured type multifunctional (meth)acrylate having at least two or more (meth)acryloyl groups and hydroxyl groups in the molecule with a polyisocyanate, a colloidal silica (B) having a primary particle size of 1-200 nm and a compound (C) having a tetrahydrofurfuryl group and the (meth)acryloyl group in the molecule.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a film having a cured film of a radiation-curable resin composition. More specifically, the present invention relates to a film having a cured film of a radiation-curable resin composition which improves the surface hardness of plastics such as polyester, acrylic, polycarbonate, and polyethersulfone and has less curl due to curing shrinkage.

[0002]

2. Description of the Related Art At present, plastics are widely used in various industries including the automobile industry, the home appliance industry, the electric and electronic industry, and the like. The reason why plastics are used in large quantities is because of their light weight, low cost, optical characteristics, and the like, in addition to their workability and transparency. However, it has drawbacks such as being softer than glass or the like and easily scratching the surface. In order to remedy these drawbacks, it is common practice to coat a surface with a hard coat agent. As the hard coat agent, a thermosetting hard coat agent such as a silicone paint, an acrylic paint, and a melamine paint is used. Among them, silicon-based hard coat agents have been used frequently because of their high hardness and excellent quality. Most high-value-added products such as glasses and lenses use this type of coating agent. However, the curing time is long, expensive and not suitable for a hard coat of a film to be processed continuously. Attempts have also been made to add a filler for preventing reflection to the silicon hard coat agent, but since the resin is a heat-curable resin, the filler agglomerates at the time of heating and a low reflectivity core within a range that does not impair transparency. At present, no product is available.

[0003] In recent years, radiation-curable acrylic hard coat agents have been developed and used. Radiation-curable hard coat agents are hardened immediately by irradiating radiation such as ultraviolet rays to form a hard film.
Since it has a high processing speed, has excellent performance such as hardness and abrasion resistance, and is inexpensive in terms of total cost, it is now the mainstream in the field of hard coating. It is particularly suitable for continuous processing of films such as polyester. Plastic films include polyester film, polyacrylate film, acrylic film, polycarbonate film, vinyl chloride film, triacetyl cellulose film, polyethersulfone film, etc., and polyester film is most widely used due to its various excellent characteristics. Is a kind of film. The polyester film is laminated on a glass shatterproof film or a light-shielding film for automobiles, or as an electronic material, on a steel plate of a housing of a home electric appliance such as a touch panel, a liquid crystal display, a CRT flat TV or a refrigerator to improve cosmetic properties. It is widely used as a film on the surface of a whiteboard. In any of these applications, a hard coat is required to prevent the surface from being damaged.

Further, in recent years, in the case of a display such as a CRT or an LCD having a film coated with a hard coat agent on the surface, the film surface becomes smooth, so that the display screen becomes difficult to see due to reflection and the eyes are easily tired. Because of the above-mentioned problem, a hard coat treatment having a surface antireflection ability is required depending on the application. As a method for preventing surface reflection, a method in which an inorganic filler or an organic fine particle filler is dispersed in a radiation-curable resin is coated on a film, and the surface is made uneven to prevent reflection (AG treatment); A method of providing a multilayer structure on a film in the order of a high refractive index layer and a low refractive index layer, reflecting the difference in refractive index and preventing reflection (AR treatment), or AG /
There is an AR processing method.

[0005]

While a hard coat having a functional property is required, many studies have been made to further improve the hardness which is the original purpose of the hard coat. However, while the thickness of the base film is limited, in order to develop a harder hard coating agent, some efforts have been made to use a harder material itself, increase the degree of cross-linking, and set a thicker film. However, there are problems such as crack generation and curling due to an increase in the degree of crosslinking in a thick film. In addition, the solvent used for the hard coat agent is also limited to alcohol-based ones because recent environmental problems and solvents that can damage the base material cannot be used depending on the type of base material used. In particular, there was a tendency that the performance such as adhesion was hard to sufficiently come out. The present invention improves the above-mentioned drawbacks, is capable of coating a thick film with low curl, does not generate cracks, and has a good adhesion to a substrate film. A radiation-curable resin composition suitable for a hard coat. An object of the present invention is to provide a film having a cured film.

[0006]

The present inventors have conducted intensive studies to solve the above problems, and as a result, have found that a radiation-curable resin composition having a specific composition can solve the above-mentioned problems. The present invention has been completed. That is, the present invention
(1) Radiation-curable polyfunctional (meth) having at least two (meth) acryloyl groups and active hydrogen in the molecule
Polyfunctional urethane acrylate (A) obtained by reacting acrylate and polyisocyanate, having a primary particle size of 1 to 200
A cured film layer of a radiation-curable resin composition comprising nanometer colloidal silica (B) and a compound (C) having a tetrahydrofurfuryl group and a (meth) acryloyl group in a molecule. When the content of the (2) polyfunctional urethane acrylate (A) is 100 parts by weight based on the total solid content of the composition,
The film according to (1), which is in the range of 20 to 90 parts by weight, (3) the content of colloidal silica (B) having a primary particle size of 1 to 200 nanometers is 100% by weight of the total solid content of the composition. (1) The film according to any one of (1) and (2), wherein the film has a tetrahydrofurfuryl group and a (meth) acryloyl group in a molecule. When the content of compound (C) is 100 parts by weight based on the total solid content of the composition,
The film according to any one of (1) to (3), which is in the range of 1 to 30 parts by weight, and (5) any one of (1) to (4), wherein the diluting solvent in the composition is an alcoholic solvent. (6) The film according to any one of (1) to (5), wherein the material of the base film is polypropylene, polyethylene, polyester, triacetyl cellulose, polyacrylate, polycarbonate or polyether sulfone. (7) The film according to any one of (1) to (6), wherein the base film has a thickness of 50 to 300 μm and the cured film layer has a thickness of 10 to 50, At least 2 in the molecule
A polyfunctional urethane acrylate (A) obtained by reacting a radiation-curable polyfunctional (meth) acrylate having at least two (meth) acryloyl groups and active hydrogen with a polyisocyanate, having a primary particle size of 1 to 200 nanometers A hard coating agent for a film containing colloidal silica (B) and a compound (C) having a tetrahydrofurfuryl group and a (meth) acryloyl group in a molecule. About.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The radiation-curable polyfunctional (meth) acrylate having at least two (meth) acryloyl groups and active hydrogen in the molecule used in the present invention is pentaerythritol tri (meth) acrylate. Acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol tri (meth) acrylate, dipentaerythritol di (meth) acrylate,
Trimethylolpropane di (meth) acrylate, epoxy acrylate and the like can be mentioned. Preferred specific examples include pentaerythritol triacrylate and dipentaerythritol pentaacrylate. These polyfunctional (meth) acrylates may be used alone or in combination of two or more.

[0008] As the polyisocyanate, a polyisocyanate composed of a chain saturated hydrocarbon, a cyclic saturated hydrocarbon, or an aromatic hydrocarbon can be used. Examples of such polyisocyanates include chain saturated hydrocarbon isocyanates such as tetramethylene diisocyanate, hexamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, and methylene bis (4-cyclohexyl). Isocyanate), hydrogenated diphenylmethane diisocyanate,
Cyclic saturated hydrocarbon isocyanates such as hydrogenated xylene diisocyanate and hydrogenated toluene diisocyanate;
-Tolylene diisocyanate, 1,3-xylylene diisocyanate, p-phenylene diisocyanate, 3,
3′-dimethyl-4,4′-diisocyanate, 6-isopropyl-1,3-phenyldiisocyanate,
Aromatic polyisocyanates such as 5-naphthalenediisocyanate can be mentioned. Preferred specific examples include isophorone diisocyanate, tetramethylene diisocyanate, and hexamethylene diisocyanate. These polyisocyanates may be used alone or in combination of two or more.

The polyfunctional urethane acrylate (A) can be obtained by reacting the above-mentioned radiation-curable polyfunctional (meth) acrylate having active hydrogen with a polyisocyanate. The polyisocyanate is used as an isocyanate group equivalent of 0.1 to 1 equivalent to 1 equivalent of active hydrogen group in the radiation-curable polyfunctional (meth) acrylate having active hydrogen.
It is in the range of 50, preferably in the range of 0.1 to 10. The reaction temperature is usually 30 to 150 ° C., preferably,
It is in the range of 50-100 ° C. The end point of the reaction is confirmed by the decrease in the amount of isocyanate.

A catalyst may be added for the purpose of shortening the reaction time. As this catalyst, either a basic catalyst or an acidic catalyst is used. Examples of the basic catalyst include pyridine, pyrrole, triethylamine, diethylamine, dibutylamine, amines such as ammonia,
Phosphines such as tributylphosphine and triphenylphosphine can be exemplified. Examples of the acidic catalyst include copper naphthenate, cobalt naphthenate,
Metal alkoxides such as zinc naphthenate, tributoxy aluminum, trititanium tetrabutoxide, zirconium tetrabutoxide, Lewis acids such as aluminum chloride, 2-ethylhexane tin, octyl tin trilaurate, dibutyl tin dilaurate, octyl tin diacetate, etc. Tin compounds can be mentioned. Among these catalysts, an acidic catalyst is preferable, and a tin compound is more preferable. These catalysts are added in an amount of 0.1 to 1 with respect to 100 parts by weight of the polyisocyanate.
Parts by weight.

Component (A) is used in an amount of 20 to 90 parts by weight, preferably 25 to 50 parts by weight, based on 100 parts by weight of the total solid content of the composition.

The primary particle size used in the present invention is 1 to 1.
200 nm colloidal silica (B) is a colloidal solution in which colloidal silica is dispersed in a solvent,
Alternatively, it can be used as fine powder colloidal silica containing no dispersion solvent. As a dispersion medium of colloidal silica, water, methanol, ethanol, isopropanol, alcohols such as n-butanol, ethylene glycol, propylene glycol monomethyl ether,
Polyhydric alcohols such as propylene glycol monomethyl ether acetate and derivatives thereof, ketones such as methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, and dimethylacetamide; esters such as ethyl acetate and butyl acetate; nonpolar solvents such as toluene and xylene; Acrylates such as -hydroxybutyl acrylate, 2-hydroxypropyl acrylate, and 4-hydroxybutyl acrylate and other general organic solvents can be used, but can be selected according to the base film to be used. For example, when a triacetyl cellulose film, a polycarbonate film, or the like is used, it is more preferable to use a film dispersed in toluene or an alcohol solvent that does not attack the substrate. The amount of the dispersion medium is usually 100 to 900 parts by weight based on 100 parts by weight of the colloidal silica.
Parts by weight. Colloidal silica (B) is usually in the range of 10 to 60 parts by weight when the total solid content of the composition is 100 parts by weight.

As these colloidal silicas, commercially available ones manufactured by a known method can be used.
It is necessary to use a particle size of 1 to 200 nm, preferably 5 to 100 nm, more preferably 10 to 30 nm. In the present invention, it is preferable to use colloidal silica having a pH of 2 to 6.

The compound (C) having a tetrahydrofurfuryl group and a (meth) acryloyl group in the molecule includes:
Examples include tetrahydrofurfuryl (meth) acrylate and caprolactone-modified tetrahydrofurfuryl (meth) acrylate. The amount of the component (C) used is determined by considering the curability of the coating film, the surface hardness, and the adhesiveness to the substrate film, when the total solid content of the composition is 100 parts by weight.
Usually, it is in the range of 1 to 30 parts by weight, preferably 3 to 2 parts by weight.
5 parts by weight.

When the composition of the present invention is cured with ultraviolet light, a photopolymerization initiator is usually added. The type of the photopolymerization initiator is not particularly limited. For example, Irgacure 184, 90
7, 651, 1700, 1800, 819, 369 (manufactured by Ciba Specialty Chemicals), Darocur 1173 (manufactured by Merck), Ezacure KIP150,
TZT (manufactured by Japan SiberHegner), Lucirin TPO
(Manufactured by BASF) and Kayacure BMS (manufactured by Nippon Kayaku).

When these photopolymerization initiators are used, when the total solid content of the composition is 100 parts by weight, it is usually in the range of 0.5 to 10 parts by weight, preferably 0.5 to 10 parts by weight.
It is 5 parts by weight, more preferably 0.5 to 3 parts by weight. The photopolymerization initiators may be used alone or in combination of two or more. In addition, those having a small molecular weight, a low melting point and a low boiling point may be gasified by heat and may adversely affect a subsequent process.

The above photopolymerization initiator can be used in combination with a curing accelerator. Examples of the curing accelerator that can be used in combination include amines such as triethanolamine, diethanolamine, N-methyldiethanolamine and EPA, and hydrogen donors such as 2-mercaptobenzothiazole. The use amount of these curing accelerators is 0 to 5 parts by weight based on the total solid content of the composition.

The radiation-curable resin composition used in the present invention can contain the above-mentioned (A), (B), (C), a photopolymerization initiator and, if necessary, a radiation-curable acrylate and a solvent. .

Examples of the radiation-curable acrylate include neopentyl glycol diacrylate, 1,6 hexanediol diacrylate, trimethylolpropane triacrylate, ditrimethylolpropane tetraacrylate, pentaerythritol tetraacrylate, pentaerythritol triacrylate, and dipentaerythritol. Hexaacrylate, bisphenol A
Diglycidyl ether diacrylate, neopentyl glycol diglycidyl ether diacrylate,
Epoxy acrylates such as diacrylate of 1,6 hexanediol diglycidyl ether; polyester acrylates obtained by esterifying polyhydric alcohol with polycarboxylic acid and / or anhydride thereof and acrylic acid; polyhydric alcohol; Urethane acrylates and polysiloxane polyacrylates obtained by reacting a divalent isocyanate and a hydroxyl group-containing acrylate. These are generally used in an amount of 0 to 50 parts by weight based on the total solid content of the composition.

As the solvent, for example, methyl ethyl ketone, ethyl acetate, butyl acetate, toluene, xylene, cyclohexanone, isopropanol and the like can be selected according to the base film to be used. For example, when using a triacetyl cellulose film, a polycarbonate film, or the like, it is desirable to use a toluene or alcohol solvent that does not attack the substrate. The amount of these solvents used is preferably 10 to 7 when the total weight of the composition is 100 parts by weight.
0 parts by weight, more preferably 20 to 60 parts by weight.

Further, in addition to the above components, a leveling agent and an antifoaming agent can be added as required. In addition, in order to improve the stability of the composition, the abrasion resistance of the resulting film, and the like, a reactive silane compound containing a reactive group such as a pigment dispersant, an acryloyl group, a methacryloyl group, or a mercapto group is added. Can also.

Further, it is also possible to add an ultraviolet absorber, a light stabilizer, various kinds of inorganic and organic fillers, a polymer and the like to impart functionality.

The radiation-curable resin composition used in the present invention comprises the components (A), (B), (C) and (D) described above.
It can be obtained by mixing the components, solvent and other components in any order. The resin composition used in the present invention is stable over time.

The film of the present invention is prepared by applying the above radiation-curable resin composition on a film substrate and drying the resin composition in a weight of 10 to 50 g / m ² , preferably 10 to 30 g.
/ M ² (10 to 50 μm, preferably 10
３０30 μm), dried, and then irradiated with radiation to form a cured film.
Examples of the film substrate include polyester, polypropylene, polyethylene, polyacrylate, polycarbonate, triacetylcellulose, and polyethersulfone. The film may be in the form of a sheet.

Examples of the method of applying the radiation-curable resin composition include bar coater coating, Meyer bar coating, air knife coating, gravure coating, reverse gravure coating, offset printing, flexographic printing, and screen printing. Is mentioned. At this time, the film to be used may be provided with a pattern or an easy-adhesion layer.

The radiation to be irradiated includes, for example, ultraviolet rays and electron beams. In the case of curing by ultraviolet rays, a xenon lamp, a high-pressure mercury lamp, an ultraviolet irradiation device having a metal halide lamp is used as a light source, and the light amount and the arrangement of the light source are adjusted as necessary. It is preferable to cure at a transport speed of 5 to 60 m / min with respect to one lamp having a light amount of 120 W / cm. On the other hand, when curing with an electron beam, 1
It is preferable to use an electron beam accelerator having an energy of 00 to 500 eV.

[0027]

EXAMPLES Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.
In the examples, parts mean parts by weight.

Synthesis Example 1 Pentaerythritol triacrylate 1 in a drying vessel
020 parts, 0.6 parts of di-n-butyltin dilaurate,
0.6 part of methoquinone was added and heated and stirred to 80 ° C.
177.8 parts of isophorone diisocyanate was added to 1
After dropwise addition over a period of time, the isocyanate value after stirring for 1 to 2 hours was 0.3 or less, indicating that the reaction was almost quantitatively completed.

Synthesis Example 2 939.7 parts of dipentaerythritol pentaacrylate and di-n-butyltin dilaurate were placed in a dry container.
47 parts and 0.3 part of methoquinone were added and heated and stirred to 80 ° C. Hexamethylene diisocyanate 60.
Three parts were added dropwise over 1 hour, and the isocyanate value after stirring for 1 to 2 hours was 0.1 or less, indicating that the reaction was almost quantitatively completed.

Example 1 The polyfunctional urethane acrylate obtained in Synthesis Example 1 was mixed with 30
Part, pentaerythritol triacrylate (Nippon Kayaku
30 parts of KAYARAD PET-30 (manufactured by Co., Ltd.), 10 parts of tetrahydrofurfuryl acrylate (Viscoat # 150 manufactured by Osaka Organic Co., Ltd.), 3 parts of Irgacure 184 (manufactured by Ciba Specialty Chemicals), and colloidal silica Isopropyl alcohol dispersion (solid content 3
0%, an organosilica sol IPA- manufactured by Nissan Chemical Industries, Ltd.
ST), 107 parts of propylene glycol monomethyl ether, and 0.15 part of a leveling agent (Polyflow No. 77, manufactured by Kyoeisha Chemical Co., Ltd.) were mixed to obtain a radiation-curable resin composition used in the present invention. This was coated on a polycarbonate substrate of 300 μm using a bar coater (No. 30), left in a dryer at 80 ° C. for 1 minute, and then placed in an air atmosphere at a distance of 10 cm / 80 W / cm from a high-pressure mercury lamp of 10 cm / cm. UV irradiation at a conveyor speed of minutes
A film having a cured film (20 μm) was obtained.

Example 2 The polyfunctional urethane acrylate obtained in Synthesis Example 1 was mixed with 30
Part, pentaerythritol triacrylate (Nippon Kayaku
20 parts of KAYARAD PET-30 manufactured by Nippon Kayaku Co., Ltd.
KAYARAD DPHA) 10 parts, tetrahydrofurfuryl acrylate (Viscoat #, manufactured by Osaka Organic Co., Ltd.)
150) 20 parts, Irgacure 184 (manufactured by Ciba Specialty Chemicals) 4 parts, propylene glycol monomethyl ether dispersion of colloidal silica (solid content: 30%, organosilica sol P manufactured by Nissan Chemical Industries, Ltd.)
GM-ST) 107 parts, isopropyl alcohol 41
Of a silane compound (SH-6062 manufactured by Toray Dow Corning Silicone Co., Ltd.) to obtain a radiation-curable resin composition used in the present invention. This was applied and cured in the same manner as in Example 1 to obtain a film having a cured film (20 μm) of the present invention.

Example 3 The polyfunctional urethane acrylate obtained in Synthesis Example 2 was converted to 55
Parts, 20 parts of tetrahydrofurfuryl acrylate (Viscoat # 150 manufactured by Osaka Organic Co., Ltd.) and 3 parts of Irgacure 184 (manufactured by Ciba Specialty Chemicals)
Parts, propylene glycol monomethyl ether dispersion of colloidal silica (solid content 30%, organosilica sol PGM-ST manufactured by Nissan Chemical Industries, Ltd.) 52 parts, propylene glycol monomethyl ether 37 parts, silane compound (Toray Dow Corning Silicone Co., Ltd.) SH-606
2) One part was mixed to obtain a radiation-curable resin composition used in the present invention. This was applied and cured in the same manner as in Example 1,
A film having a cured film (20 μm) of the present invention was obtained.

Comparative Example 1 The polyfunctional urethane acrylate obtained in Synthesis Example 1 was mixed with 30
Part, pentaerythritol triacrylate (Nippon Kayaku
30 parts of KAYARAD PET-30 manufactured by Co., Ltd., 20 parts of tetrahydrofurfuryl acrylate (Viscoat # 150 manufactured by Osaka Organic Co., Ltd.), 3 parts of Irgacure 184 (manufactured by Ciba Specialty Chemicals), and colloidal silica Isopropyl alcohol dispersion (solid content 3
0%, an organosilica sol IPA- manufactured by Nissan Chemical Industries, Ltd.
ST) 107 parts and isopropyl alcohol 20 parts were mixed to obtain a radiation-curable resin composition for comparative test. This was applied and cured in the same manner as in Example 1, and a cured film for comparison (2
0 μm).

Comparative Example 2 40 parts of dipentaerythritol hexaacrylate (KAYARAD DPHA manufactured by Nippon Kayaku Co., Ltd.), 3 parts of Irgacure 184 (manufactured by Ciba Specialty Chemicals) and 43 parts of toluene were mixed. A radiation-curable resin composition for a comparative test was obtained. This was applied and cured in the same manner as in Example 1 to obtain a film having a comparative cured film (20 μm).

Table 1 shows the results of evaluation using the film thus obtained. The following evaluation criteria were used.

(1) Pencil hardness measurement According to JIS K 5400, a 2H pencil scratch test was performed on the above-mentioned coated film at a load of 500 g using a pencil scratch tester. Judgment ○: No scratches 3 times or more 5 times ×: Scratches 2 or more times 5 times

(2) Scratch resistance test A steel wool # 0000 was reciprocated 10 times under a load of 200 g / cm ² , and the condition of the scratch was visually determined. Judgment ○: No scratch ×: Scratched

(3) Adhesion The adhesion of the film surface was evaluated in accordance with JIS K 5400 grid test. Judgment was made based on the remaining number of the 100 grids.

(4) Appearance The state of the surface such as cracks, whitening, and cloudiness was visually judged. Judgment ：: good △: occurrence of cracks, cloudiness, etc. ×: remarkable state

(5) Curl After heating the film at 80 ° C. for 1 hour, it was placed on a flat table and the curl of the film was visually observed. Judgment ○: almost no curl and distortion ×: remarkable curl and distortion

Table 1 Evaluation Results Pencil Hardness Scratch Resistance Adhesion Appearance Curl Example 1 ○ ○ 100 ○ ○ Example 2 ○ ○ 100 ○ ○ Example 3 ○ ○ 100 ○ ○ Comparative Example 1 ○ ○ 0 ○ ○ Compare Example 2 ○ ○ 0 △ ×

As is clear from Table 1, the film having the cured film of the radiation-curable resin composition of the present invention has good pencil hardness, scratch resistance, good adhesion to the substrate and excellent curl. was gotten.

[0043]

The film having a cured film of the radiation-curable resin composition of the present invention has good pencil hardness, scratch resistance, and curl, and is suitable for plastic optical parts, touch panels, flat displays, film liquid crystal elements, etc. It is a hard coat film suitable for a field requiring high hardness. Further, even when an alcohol-based solvent is used in consideration of the effect on the environment and the type of the substrate, the radiation-curable resin composition has good adhesion to the substrate.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08J 7/04 CEZ C08J 7/04 CEZM C09D 4/02 C09D 4/02 5/00 5/00 Z 175 / 14 175/14 // C08L 101: 00 C08L 101: 00 F term (reference) 4F006 AA02 AA12 AA22 AA35 AA36 AA40 AB37 AB76 BA02 CA04 CA05 DA04 4F100 AA20A AJ06B AK04B AK07B AK25A AK25B AK25J AK41B AK45A01BAKA EH46 EJ54 GB41 JA20A JA20B JB14A JK06 JK12 JK12A JK14 JL04 YY00A YY00B 4J011 PA13 PB06 PB22 PC02 PC11 QA03 QB24 UA01 UA03 VA01 WA02 4J027 AA02 AG02 AG10 AG23 AG24 FA27 CC07 FA18

Claims (8)

[Claims] 1. A polyfunctional urethane acrylate (A) obtained by reacting a radiation-curable polyfunctional (meth) acrylate having at least two or more (meth) acryloyl groups and active hydrogen in a molecule with a polyisocyanate, Primary particle size is 1
A cured film of a radiation-curable resin composition, comprising colloidal silica (B) having a thickness of 200 to 200 nanometers and a compound (C) having a tetrahydrofurfuryl group and a (meth) acryloyl group in a molecule. A film having a layer. 2. The film according to claim 1, wherein the content of the polyfunctional urethane acrylate (A) is in the range of 20 to 90 parts by weight, when the total solid content of the composition is 100 parts by weight. 3. The content of colloidal silica (B) having a primary particle size of 1 to 200 nanometers is in the range of 10 to 60 parts by weight, when the total solid content of the composition is 100 parts by weight. Item 3. The film according to any one of items 1 or 2. 4. The content of the compound (C) having a tetrahydrofurfuryl group and a (meth) acryloyl group in the molecule, when the total solid content of the composition is 100 parts by weight,
The film according to any one of claims 1 to 3, which is in a range of 1 to 30 parts by weight. 5. The film according to claim 1, wherein the diluting solvent in the composition is an alcohol. 6. The base film is made of polypropylene,
The film according to any one of claims 1 to 5, wherein the film is polyethylene, polyester, triacetyl cellulose, polyacrylate, polycarbonate, or polyether sulfone. 7. The base film has a thickness of 50 to 300 μm.
Wherein the thickness of the cured film layer is 10 to 50.
7. The film according to any one of items 6 to 6. 8. A polyfunctional urethane acrylate (A) obtained by reacting a polyisocyanate with a radiation-curable polyfunctional (meth) acrylate having at least two or more (meth) acryloyl groups and active hydrogen in the molecule, Primary particle size is 1
A hard coat agent for a film containing colloidal silica (B) having a thickness of about 200 nm and a compound (C) having a tetrahydrofurfuryl group and a (meth) acryloyl group in a molecule.