Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-01-08
1999-04-06
Glass, Margaret W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525209, 428447, 428446, C08F 800, C08L 8306
Patent
active
058919589
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a curable composition suitable as a top coat, which is suitably used for, for instance, automobiles, industrial equipments, steel furnitures, interior and exterior of buildings, household electric appliances, plastics and the like, and a coated material using the same. More particularly, the present invention relates to a curable composition suitable as a top coat, which shows an extremely excellent stain resistance in addition to excellent acid resistance, scratch resistance, appearance, thermosetting property and the like, and which can be suitably used as, in particular, a top coat for automobiles, and a coated material using the same.
BACKGROUND ART
Conventionally, coating materials mainly containing a melamine resin such as alkyd melamine or acrylic melamine have been used for coating automobiles, industrial equipments, steel furnitures, interior and exterior of buildings, household electric appliances, plastics and the like.
However, these coating materials mainly containing a melamine resin involve the problems that harmful formalin greatly generates during curing and that cured coating films are damaged by acid rain because they are poor in acid resistance. In particular, the problem of acid rain owing to air pollution assumes a serious aspect in recent years, and there is observed a phenomenon that etching, whitening or spotting occurs in the coating films.
As a curable composition suitable as a coat, which solves the above-mentioned problems, there are known a curable coating composition containing a blend of a vinyl copolymer having a hydrolyzable silyl group and an acrylic polyol, and a curable coating composition containing a copolymer of a vinyl monomer having a hydrolyzable silyl group and a vinyl monomer having an alcoholic hydroxyl group (Japanese Unexamined Patent Publication No. 141952/1989 and Japanese Unexamined Patent Publication No. 136324/1994).
However, the above-mentioned curable coating compositions are demanded to improve easiness in removal of adhered stains, namely stain resistance, from the viewpoints of beauty of appearance, easiness in cleaning, decrease in the number of cleaning operations and the like.
The present invention has been accomplished in consideration of the above-mentioned prior art, and aims at providing a curable composition suitable as a top coat showing an excellent stain resistance in addition to excellent acid resistance, scratch resistance, water resistance and thermosetting property, and a coated material using it.
DISCLOSURE OF THE INVENTION
The present invention relates to copolymer chain, in which a reactive silyl group represented by the formula (I): ##STR1## wherein R.sup.1 is hydrogen atom or an alkyl group having 1 to 10 carbon atoms, R.sup.2 is hydrogen atom or a monovalent hydrocarbon group selected from the group consisting of an alkyl group having 1 to 10 carbon atoms, an aryl group and an aralkyl group, and a is 0, 1 or 2, is combined with a carbon atom in the molecule at the main chain end and/or side chain of the copolymer, the copolymer having at least one alcoholic hydroxyl group at the main chain end and/or side chain and having an alcoholic hydroxyl group equivalent of 400 to 2000 g/mole, consisting of an alkyl group having 1 to 10 carbon atoms, an aryl group and an aralkyl group, R.sup.4 is a monovalent hydrocarbon group selected from the group consisting of an alkyl group having 1 to 10 carbon atoms, an aryl group and an aralkyl group, and b is 0 or 1, and/or a partial hydrolysis condensation product thereof, and dispersion (B) is 5 to 100 parts by weight, in terms of solid matter, based on 100 parts by weight of the vinyl copolymer (A), the amount of the silicon-containing compound and/or its partial hydrolysis condensation product (C) is 2 to 100 parts by weight based on 100 parts by weight of the vinyl copolymer (A), and the amount of the curing catalyst (D) is 0.001 to 10 parts by weight based on 100 parts by weight of the total amount of solid matters of the vinyl copolyme
REFERENCES:
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patent: 5498666 (1996-03-01), Nambu et al.
patent: 5602204 (1997-02-01), Harimoto et al.
Arioka Jiro
Inoue Masaharu
Kawaguchi Hirotoshi
Nakamura Seigo
Nambu Toshiro
Glass Margaret W.
Kanegafuchi Kagaku Kogyo & Kabushiki Kaisha
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