Alkoxysilyl group-containing acrylic copolymer with alkoxysilicon compound

A curable composition suitable as a top coat which comprises:

• (A) an acrylic copolymer having a reactive silicon-containing group of the formula (I):
• ##STR13## 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,
• (B) 2 to 70 parts of at least one member selected from the group consisting of a silicon compound of the formula (II):
• (R.sup.3 O).sub.4-b --Si--R.sub.b.sup.4 (II)
• wherein R.sup.a 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, 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 a condensate of a partial hydrolysis product of said silicon compound (II),
• (C) 0.1 to 20 parts of at least one curing catalyst selected from the group consisting of an organic carboxylic acid compound, a combination of an organic carboxylic acid compound and an organic amine compound, and an organometallic compound, and
• (D) 0.1 to 20 parts of an agent for improving adhesion, said parts of (B), (C) and (D) being parts by weight per 100 parts by weight of said acrylic copolymer (A).