JP2001288230A - Curable resin composition for producing gel coat sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curable resin composition for producing a gel coat sheet of which the surface pattern does not dissolve and disappear under thermal pressing and which is free from crack generation and can be stably stored for a long time. SOLUTION: This resin composition comprises (a) a urethane (meth)acrylate compound prepared by the condensation reaction of a compound having at least two hydroxyl groups, a polyisocyanate comprising an aliphatic polyisocyanate and/or an alicyclic polyisocyanate, and a hydroxy (meth)acrylate compound having at least one (meth)acrylic group and at least one hydroxyl group, another monomer copolymerizable with the compound, and a curing agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a curable resin composition used for protecting and decorating the surface of a plastic molded product.
More specifically, it is intended to protect and decorate the surface of hot-pressed products such as fiber reinforced plastics and resin concrete used for construction machinery, housing equipment, ships, boats, automobiles, vehicles, tanks, containers, etc. The present invention relates to a curable resin composition for producing a gel coat sheet for forming a cured resin layer.

[0002]

2. Description of the Related Art Conventionally, there is known a method of simultaneously inserting a gel coat sheet and a molding material into a mold and forming a cured resin layer for the purpose of protecting and decorating the surface of the molded product by hot pressing. For example, JP-A-5-318468 and JP-A-8-17
No. 4782 discloses a method for producing a gel coat sheet from a semi-cured curable resin composition, forming the cured resin layer by hot pressing simultaneously with the obtained gel coat sheet and a molding material in a mold. I have. Since the gel coat sheet used in this method is in a semi-cured state, when a gel coat sheet having a pattern or a pattern, for example, the pattern elutes during hot pressing. Further, as the curing of the gel coat sheet progresses, cracks are likely to occur during hot pressing, so that it cannot be used for deep drawing. Furthermore, it has drawbacks such as being unsuitable for long-term storage and transportation for the above reasons.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art.
The inventors did not elute the handle at the time of hot pressing, can be used for deep drawing shape, and as a result of intensive study for the purpose of providing a gel coat sheet that can be stored and transported for a long time,
It has been found that a curable resin composition comprising a compound containing a specific acrylic group or a methacrylic group (hereinafter, referred to as (meth) acrylic group) and a curing agent can satisfy the above-mentioned various properties. The present invention has been completed.

[0004]

The object of the present invention is to provide a gel coat sheet which is inserted into a mold simultaneously with a molding material in hot press molding to form a cured resin layer for the purpose of protecting and decorating the surface of the molded body. Ingredients shown (a), (b),
This is achieved by producing a curable resin composition comprising (c) as an essential component.

(A) A compound having at least two hydroxyl groups in the same molecule, a polyvalent isocyanate and a hydroxy (meth) acrylate compound having at least one (meth) acryl group and at least one hydroxyl group in the same molecule Urethane (meth) obtained by condensation reaction
A urethane (meth) acrylate compound in which the polyvalent isocyanate is at least one of an aliphatic isocyanate and an alicyclic isocyanate. (B) Other monomers copolymerizable with component (a). (C) Curing agent.

Hereinafter, the present invention will be described in detail. Examples of the compound having at least two hydroxyl groups in the same molecule of the component (a) used in the present invention include poly (ethylene oxide) diol, poly (propylene oxide) diol, copoly (tetramethylene) oxide diol, polyester polyol, (Hydrogenated) Polyhydric alcohols such as polybutadiene polyol, caprolactone modified diol, polycarbonate diol and the like, thermosetting resins such as unsaturated polyester resin, alkyd resin and epoxy resin, and thermoplastic resin such as saturated polyester resin Is exemplified, but is not particularly limited. Examples of the polyvalent aliphatic isocyanate include hexamethylene diisocyanate and trimethyl diisocyanate, and examples of the alicyclic diisocyanate include isophorone diisocyanate and methylene bis (4-cyclohexyl isocyanate). As the polyisocyanate compound of the component (a) of the present invention, aliphatic isocyanates and alicyclic isocyanates were used, and aromatic polyisocyanates such as tolylene diisocyanate were not used. This is because the curable resin composition composed of the urethane (meth) acrylate compound yellows with time, not only impairing the appearance, but also deteriorating the performance as a protective layer of the molded product.

As the hydroxy acrylate compound, 2-hydroxyethyl (meth) acrylate,
-Hydroxypropyl (meth) acrylate and the like. The outline of the method of synthesizing the urethane (meth) acrylate compound from various raw materials described above will be described. First, a polyhydric alcohol and a polyhydric isocyanate
OH or -NCO is mixed at a molar ratio of 1 or less, and reacted in the presence of an amine or tin compound catalyst to form an isocyanate prepolymer at both ends, and then the hydroxy (meth) acrylate compound is converted to -OH Alternatively, they are added and reacted at a molar ratio of -NCO of 1 or more to obtain a urethane (meth) acrylate compound. Since this method can increase the reaction rate, it is suitable for obtaining the curable resin composition of the present invention. However, the method for producing the urethane (meth) acrylate of the present invention is not limited to these methods. Further, as the urethane (meth) acrylate compound of the component (a) used in the present invention, a commercially available urethane (meth) acrylate compound having the above structure can also be used. Urethane (meta)
The acrylate compounds can be used alone or in combination of two or more.

The other monomer copolymerizable with the component (a), which is the component (b) used in the present invention, includes acrylic acid and methacrylic acid and an aliphatic having 1 to 18 carbon atoms, or Esters with aromatic alcohols, for example, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, lauryl methacrylate, cyclohexyl methacrylate, 2-ethylhexyl methacrylate, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate,
2-ethylhexyl acrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, pentaerythritol tetramethacrylate, pentaerythritol tetramethacrylate, hydroxypropyl methacrylate, hydroxypropyl Monomers such as acrylate, hydroxyethyl methacrylate, hydroxyethyl acrylate, dimethylaminoethyl methacrylate, dimethylaminoethyl acrylate, ethylaminoethyl methacrylate, and ethylaminoethyl acrylate; vinyl aromatic compounds such as styrene, vinyltoluene and divinylbenzene; Line Mixtures of these compounds with maleic or fumaric acid derivatives such as chlorophenylmaleimide and monobutyl maleate; allyl ethers and esters such as allyl diglycol dicarbonate; and acrylonitrile and methacrylonitrile such as acrylonitrile and methacrylonitrile. Nitriles; vinyl esters such as vinyl acetate; vinyl ethers; vinyl monomers such as vinyl chloride, vinylidene chloride and vinyl pyrrolidone; and other monomers such as ethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, and trimethylol. Monomers having two or more reactive groups in the molecule such as propane triacrylate and pentaerythritol tetramethacrylate are exemplified. However, the monomer of component (b) is not limited to these.

The amount of the monomer (b) in the curable resin composition of the present invention depends on the required properties such as the required hardness of the gel coat layer, environmental resistance, and the viscosity in the gel coat sheet manufacturing process. What is necessary is just to determine the compounding quantity. Although not intended to be limiting, the urethane (meth) acrylate compound of the component (a) and the component (a) are preferably used in view of the coatability of the resin composition of the present invention and the dimensional stability during the production of a gel coat sheet due to curing shrinkage. The weight mixing ratio (b) to the monomer of (b): (b) is from 20:80 to 80:20, more preferably from 40:60 to 60:40. The above monomers can be used alone or in combination of two or more.

The curing agent of the component (c) of the resin composition of the present invention may be appropriately selected depending on the desired curing method, curing speed, curing temperature and the like. Although not particularly limited, radical polymerization initiators such as organic peroxides and azo compounds and photopolymerization initiators are useful and easily available. Specific examples of these polymerization initiators include benzoyl peroxide,
Diacyl peroxides such as lauroyl peroxide and succinic peroxide; dialkyl peroxides such as di-t-butyl peroxide, t-butylcumyl peroxide and dicumyl peroxide; t-butylperoxyacetate and t-butylperoxide Peroxyesters such as oxypivalate, t-butylperoxybenzoate, and hemiperester t-butylmaleate; organic peroxides represented by ketone peroxides such as t-butyl hydroperoxide and cumene hydroperoxide; Alternatively, azo compounds such as 2,2-azobisisobutyronitrile and 2,2-azobis (2,4-dimethylvaleronitrile) are exemplified. These polymerization initiators can be used alone or as a curing agent even if two or more kinds are mixed. The amount of the curing agent (C) to be added may be determined according to the desired curing speed, curing temperature, mechanical strength of the cured product, etc., and is not particularly limited. It is usually 0.01 to 5.0% by weight, preferably 0.1 to 5.0% by weight, based on 100 parts by weight. A polymerization accelerator and / or a polymerization promotion auxiliary may be added together with the radical polymerization initiator. Specific examples of these polymerization accelerators and polymerization accelerators include mercaptans such as lauryl mercaptan, octyl mercaptan, 2-ethylhexyl mercaptan, and glycol dimethyl captopropionate; dibutyl thiourea, tetramethyl thiourea, etc. And phosphites such as trimethyl phosphite and tri-n-butyl phosphite. In addition, as a polymerization promoting auxiliary,
Salts of organic acids such as naphthenic acid of metals selected from iron, copper, cobalt, nickel, tin, aluminum and antimony, or organometallic complexes of these metals with acetylacetone, phenylacetylacetone, etc., allyl compounds of these metals Is exemplified.

As a curing agent for the resin composition of the present invention, not only heat energy but also an active energy ray, that is, a photopolymerization initiator excited by an energy ray such as an electron beam, an ultraviolet ray or a visible light ray can be used. The photopolymerization initiator is not particularly limited as long as it is appropriately selected in consideration of the wavelength of the active energy ray to be used, a desired curing rate, and storage stability. For example, benzophenone, 4,
4'-bis (dimethylamino) benzophenone, 4-methoxy-4'-diethylaminobenzophenone, acetophenone, 3,3-dimethyl-4-methoxybenzophenone, 4-chlorobenzophenone, 4,4'-diaminobenzophenone, 3,3 ' , 4,4'-tetra (t-butylperoxycarbonyl) benzophenone, 1-hydroxycyclohexylphenyl ketone, 2-hydroxy-2
-Methyl-1-phenylpropan-1-one, 1- (4
Aromatic ketone compounds such as -dodecylphenyl) -2-hydroxy-2-methylpropan-1-one and 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one; thioxanthone , 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-
Substituted and unsubstituted thioxanthone compounds such as dimethylthioxanthone, isopropylthioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone and 2,4-dichlorothioxanthone; benzyl , Camphorquinone, α-naphthylacetylifene, p, p'-dimethoxybenzyl,
α-diketone compounds such as p, p′-dichlorobenzyl; benzoin compounds such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin phenylethyl ether, benzoin propyl ether, benzyl dimethyl ketal, α-acryl benzoin; 2-methyl Anthraquinone, 2-ethylanthraquinone, 2-propylanthraquinone, 2-tert-butylanthraquinone, octylmethylanthraquinone,
1,4-dimethylanthraquinone, 2,3-dimethylanthraquinone, 2-phenylanthraquinone, 2,3-
Quinone compounds such as diphenylanthraquinone, 1-chloroanthraquinone, 2-chloroanthraquinone, 3-chloro-2-methylanthraquinone and 9,10-phenanthraquinone; 2,4,6-trimethylbenzoyldiphenylphosphine oxide; Acylphosphine oxide compounds such as 6-dimethylbenzoyldiphenylphosphine oxide; xanthone, Michler's ketone,
Examples include acetophenone diethyl ketal,
In addition to these compounds, known and commercially available compounds for industrial use can be used. These photopolymerization initiators can be used alone or in combination of two or more. The blending ratio of the photopolymerization initiator may be determined according to the desired curing speed, curing depth, mechanical strength of the cured product, etc., and is not particularly limited. Is usually in the range of 0.01 to 5.0 parts by weight, more preferably 0.1 to 5.0 parts by weight, per 100 parts by weight of the photopolymerizable resin. Further, a thiol compound, an organic peroxide, or the like may be added for the purpose of further increasing the curing speed of the photocurable resin composition of the present invention.

The curable resin composition of the present invention may optionally contain other known additives in an appropriate amount as long as the properties of the resin composition of the present invention are not impaired. Other additives include inorganic fillers such as glass, quartz, aluminum hydroxide, alumina, kaolin, talc, calcium carbonate, calcium silicate, and magnesium hydroxide, and organic resins such as acrylic resin powder, epoxy resin powder, and polyester resin powder. Fillers, coloring agents such as pigments and dyes such as carbon black, red iron oxide, phthalocyanine blue, chrome yellow, and titanium dioxide, crushed colored films, colored natural mineral powders, metal powders, crushed metal foils, and fiber reinforcement Agents, ultraviolet absorbers, heat stabilizers, lubricants, release agents, surfactants, coupling agents, and the like, but are not limited thereto.

A gel coat sheet comprising the resin composition of the present invention is produced, for example, by applying the resin composition of the present invention to a release-treated flat glass plate, metal plate, film, or the like using a spray, a brush, a blade, or the like, and peeling after curing. can do. In addition, at this time, for the purpose of reinforcement and decoration, if necessary, glass cloth, inorganic or organic fabric such as Japanese paper, etc. can be used in combination, but it is not limited to these manufacturing methods.

[0014]

EXAMPLES Hereinafter, typical examples of the present invention will be described in more detail with reference to examples. However, the present invention is not limited by the following examples. In the examples, “parts” means “parts by weight”. Synthesis Example 1: Synthesis of urethane (meth) acrylate 500 ml equipped with a thermometer, a stirrer, and a condenser
Polycarbonate todiol having a molecular weight of 800 (trade name "PLAC" manufactured by Daicel Chemical Industries, Ltd.)
CEL CD-208PL ") 80 g (0.1 mol),
44.4 g (0.2 mol) of isophorone diisocyanate, which is an alicyclic diisocyanate, and 0.03 g of dibutyltin dilaurate were added and reacted at 50 ° C. for 4 hours under a nitrogen atmosphere. Then, 0.06 g of methoxyphenol was added, and 26.3 g of 2-hydroxyethyl methacrylate was added.
(0.202 mol) was added dropwise, and further under a nitrogen atmosphere.
The reaction was performed at 4 ° C. for 4 hours to obtain urethane methacrylate.
After the reaction, the infrared absorption spectrum of the product was measured and 2
It was confirmed that there was no absorption of an isocyanate group at 270 cm ^-1 . Synthesis Example 2: Synthesis of urethane (meth) acrylate using aromatic diisocyanate Instead of isophorone diisocyanate in Synthesis Example 1, 34.8 g of 2,4-tolylene diisocyanate which is an aromatic diisocyanate. (0.2 mol), and urethane methacrylate was obtained in the same manner as in Synthesis Example 1 except for the above. Synthesis Example 3: Synthesis of urethane (meth) acrylate Instead of polycarbonate-diol in Synthesis Example 1, a polyester diol having a molecular weight of 3000 (Kuraray Co., Ltd., trade name “Kuraray polyol P-3010” 3)
A urethane methacrylate was obtained in the same manner as in Synthesis Example 1 except for using 00 g (0.1 mol). Synthesis Example 4: Synthesis of urethane (meth) acrylate Polycarbonate diol having a molecular weight of 3000 (Kuraray Co., Ltd., trade name “Kuraray polyol P-3010” 3) was used instead of polycarbonate-diol in Synthesis Example 1.
Synthesis Example 1 was replaced by 23.4 g (0.202 mol) of 2-hydroxyethyl acrylate instead of 00 g (0.1 mol) and 2-hydroxyethyl methacrylate.
A urethane acrylate was obtained in the same manner as described above. Example 1 60 parts of urethane methacrylate and 40 parts of methyl methacrylate obtained in Synthesis Example 1 were mixed with 5.0 parts of titanium oxide white pigment.
Parts were mixed with a high-speed stirrer, and 0.2 parts of 6% cobalt naphthenate and 0.5 parts of methyl ethyl ketone peroxide were further added.
The parts were mixed to obtain a curable resin composition. The curable resin composition was applied to a release-treated glass plate using a wire bar so as to have a thickness of about 500 μm. Then 60
After heating and curing in an oven at a temperature of 30 ° C. for 30 minutes, it was peeled off from the glass plate to obtain a gel coat sheet. This gel coat sheet is placed on an embossed flat plate forming mold (lower mold), and an SMC sheet is stacked thereon, and the temperature is 140 ° C. and 6 MPa.
After pressing under heat for 10 minutes at a pressure of 3 mm, the mold was removed to obtain a molded article having a white gel coat layer on the surface layer. This gel coat layer accurately copied the surface condition of the mold. Furthermore, a 50,000 mJ /
Irradiated with UV light in an amount of cm ² . The surface after irradiation was visually observed, but no color change was observed. Example 2 After storing the gel coat sheet in Example 1 at room temperature for 60 days, the gel coat sheet was placed in an embossed flat plate forming die (lower die) in the same manner as in Example 1, and the SMC sheet was stacked thereon.
After hot pressing for 10 minutes at a temperature of 6 ° C. and a pressure of 6 MPa, the molded product was demolded to obtain a molded product having a white gel coat layer on the surface. This gel coat layer accurately copied the surface condition of the mold as in Example 1. Example 3 60 parts of urethane methacrylate and 40 parts of methyl methacrylate obtained in Synthesis Example 1 were mixed with 5.0 parts of titanium oxide white pigment.
Parts were stirred and mixed, and further 6% cobalt naphthenate 0.2 was added.
And 0.5 parts of methyl ethyl ketone peroxide, to obtain a curable resin composition. The curable resin composition was applied to a release-treated glass plate using a wire bar so as to have a thickness of about 500 μm. Then, it was cured by heating in an oven at 60 ° C. for 30 minutes. Further, 60 parts of urethane methacrylate and 40 parts of methyl methacrylate obtained in Synthesis Example 1 were mixed with 5.0 parts of titanium oxide white pigment fumed silica ("Aerosil 200" manufactured by Nippon Aerosil Co., Ltd.).
0 parts were mixed with a high-speed stirrer, 0.2 parts of 6% cobalt naphthenate and 0.5 parts of methyl ethyl ketone peroxide were mixed, and a white resin having a diameter of about 2 mm was sprayed on the previously cured transparent resin using a spray gun. And then cured by heating in an oven at 60 ° C. for 30 minutes, and then peeled off from the glass plate to obtain a gel coat sheet. This gel coat sheet was placed on an embossed flat plate forming mold (lower mold), and an SMC sheet was stacked thereon,
After heat-pressing at a temperature of 6 ° C. and a pressure of 6 MPa for 10 minutes, the molded product was demolded to obtain a molded product having a white polka dot gel coat layer.
This gel coat layer accurately copied the surface condition of the mold, and further, no cracks or chips were found in the polka dot pattern. Example 4 60 parts of urethane methacrylate and 40 parts of methyl methacrylate obtained in Synthesis Example 3 were mixed with 5.0 parts of titanium oxide white pigment.
Parts were mixed with a high-speed stirrer, and 0.2 parts of 6% cobalt naphthenate and 0.5 parts of methyl ethyl ketone peroxide were further added.
The parts were mixed to obtain a curable resin composition. The curable resin composition was applied to a release-treated glass plate using a wire bar so as to have a thickness of about 500 μm. Then 60
After heating and curing in an oven at a temperature of 30 ° C. for 30 minutes, it was peeled off from the glass plate to obtain a gel coat sheet. This gel coat sheet was placed in a hemispherical molding die (lower die) having a diameter of about 200 mm, and an SMC sheet was stacked thereon,
After heat-pressing at a pressure of 6 MPa for 10 minutes, the mold was removed, and a molded product having a white gel coat layer on the surface layer was obtained. The gel coat layer accurately copied the surface condition of the mold, and no cracks or chips were found in the gel coat layer. Example 5 2.0 parts of a titanium oxide white pigment was mixed with 60 parts of the urethane acrylate, 20 parts of isobornyl acrylate, and 20 parts of diethylene glycol diacrylate obtained in Synthesis Example 4 using a high-speed stirrer, followed by photopolymerization. Dar as initiator
One part of Ocur1173 (manufactured by MERK Co., Ltd.) was mixed to obtain a curable resin composition. The curable resin composition was applied to a release-treated glass plate using a wire bar so as to have a thickness of about 500 μm. Then, the coating was irradiated with ultraviolet rays of 3000 mJ / cm ² using a high-pressure mercury lamp and cured, and then peeled off from the glass plate to obtain a gel coat sheet. This gel coat sheet was placed in a hemispherical mold (lower mold) having a diameter of about 200 mm, an SMC sheet was placed thereon, and heated and pressed at 140 ° C. and a pressure of 6 MPa for 10 minutes. A molded article having a layer was obtained.
The gel coat layer accurately copied the surface condition of the mold, and no cracks or chips were found in the gel coat layer. Example 6 A titanium oxide white pigment 5.0 parts was added to 60 parts of the urethane methacrylate obtained in Synthesis Example 3 and 40 parts of methyl methacrylate.
Parts were mixed with a high-speed stirrer, and 0.2 parts of 6% cobalt naphthenate and 0.5 parts of methyl ethyl ketone peroxide were further added.
The parts were mixed to obtain a curable resin composition. The curable resin composition was impregnated into a polyester nonwoven fabric placed on a release-treated glass plate, and was applied using a wire bar to a thickness of about 500 μm. Then in an oven at 60 ° C for 30
After heating and curing for minutes, it was peeled off from the glass plate to obtain a gel coat sheet. The gel coat sheet having a diameter of about 20
It is placed on a 0 mm hemispherical molding die (lower die), an SMC sheet is placed on it, and 10 mm at 140 ° C. and 6 MPa pressure.
After heat pressing for one minute, the mold was removed to obtain a molded article having a white gel coat layer on the surface layer. The gel coat layer accurately copied the surface condition of the mold, and no cracks or chips were found in the gel coat layer. Comparative Example 1 Titanium oxide white pigment 5.0 parts was added to 60 parts of urethane methacrylate and 40 parts of methyl methacrylate obtained in Synthesis Example 2.
Were mixed with a high-speed stirrer, and 0.2 part of 6% cobalt naphthenate and 0.5 part of methyl ethyl ketone peroxide were mixed to obtain a curable resin composition. The curable resin composition was applied to a release-treated glass plate using a wire bar so as to have a thickness of about 500 μm. Next, the mixture was cured by heating in an oven at 60 ° C. for 30 minutes, and then peeled off from the glass plate to obtain a gel coat sheet. This gel coat sheet is placed on an embossed flat plate forming die (lower die),
An SMC sheet was superimposed thereon, heated and pressed at 140 ° C. and a pressure of 6 MPa for 10 minutes, and then demolded to obtain a molded article having a white gel coat layer on a surface layer. This gel coat layer accurately copied the surface condition of the mold. Furthermore, a 50,000 mJ / cm was applied to the surface of the white gel coat of this molded product using a high pressure mercury lamp.
^Two doses of UV light were applied. When the surface after irradiation was visually observed, remarkable yellowing was observed. Comparative Example 2 Titanium oxide white pigment 5.0 parts was added to 15 parts of urethane methacrylate obtained in Synthesis Example 1 and 85 parts of methyl methacrylate.
Parts, fumed silica (5.0 parts of "Aerosil 200" manufactured by Nippon Aerosil Co., Ltd. are mixed with a high-speed stirrer, and further 0.2 parts of 6% cobalt naphthenate and 0.5 parts of methyl ethyl ketone peroxide are mixed and cured. The curable resin composition was applied to a release-treated glass plate using a wire bar so as to have a thickness of about 500 μm, and then cured by heating in a 60 ° C. oven for 30 minutes. However, a large number of cracks occurred in the cured product on the glass plate, and this cured product was not suitable as a gel coat sheet.

[0015]

As is clear from the above description, the gel coat sheet obtained from the curable resin composition of the present invention does not elute during hot pressing because the curing is sufficiently advanced. Cracks during pressing hardly occur and can be used for deep drawing shapes. Furthermore, long-term storage and transportation are possible. Therefore, the curable resin composition of the present invention is suitable for the production of a gel coat sheet in which a curable resin layer is formed in a mold simultaneously with the molding material to form a cured resin layer for the purpose of protecting and decorating the surface of the molded body.

Continued on the front page F term (reference) 4F072 AB09 AB28 AB31 AD43 AL02 AL06 AL07 AL17 4J027 AG03 AG04 AG05 AG07 AG09 AG24 AG27 BA04 BA05 BA07 BA08 BA13 BA15 BA19 BA20 BA26 BA28 CB03 CB04 CB09 CB10 CC02 CC03 CD08 4J034 BA08 CA02 CA03 CB04 DB03 DB04 DF01 DF02 DF12 DF14 DF29 DG03 DG04 DG06 DK01 DP19 FA02 FB01 FC01 FC02 HC03 HC22 HC46 HC61 HC64 RA07

Claims (2)

[Claims] (1) The following components (a), (b),
A curable resin composition for producing a gel coat sheet, characterized by containing (c). (A) Obtained by a condensation reaction of a compound having at least two hydroxyl groups in the same molecule with a polyvalent isocyanate and a hydroxy (meth) acrylate compound having at least one (meth) acryl group and at least one hydroxyl group in the same molecule. Urethane (meth) acrylate compound, the above-mentioned polyvalent isocyanate is at least one of an aliphatic isocyanate and an alicyclic isocyanate, a urethane (meth) acrylate compound, and (b) another monomer copolymerizable with the component (a). And (c) a curing agent. 2. The weight mixing ratio of the urethane (meth) acrylate compound of component (a) and the monomer of component (b) is 20:
The curable resin composition for producing a gel coat sheet according to claim 1, wherein the ratio is from 80 to 80:20.