Coated shaped article of polycarbonate type resin

Claim 1

A coated shaped article of a polycarbonate type resin possessed of improved abrasion resistance, which comprises: (I) a shaped substrate of a polycarbonate type resin, (II) an undercoat layer formed on said substrate in a thickness of at least about 0.1 micron, which undercoat is formed of a composition containing a polymer selected from the group consisting of: (i) a polymer having repeating structural units represented by the general formula (3): ##STR25## wherein, R 6 and R 7 independently stand for a hydrogen atom or an alkyl group of 1 to 5 carbon atoms or carboxyl group and X for a side chain containing carboxyl group, amino group or epoxy group, and (ii) a polymer having repeating structural units represented by the general formula (4): ##STR26## wherein, R 8 and R 9 indepedently stand for a hydrogen atom or a lower alkyl group of 1 to 5 carbon atoms or carboxyl group and Y for a side chain containing a hydroxyl group and repeating structural units represented by the general formula (5): ##STR27## wherein, R 10 and R 11 independently stand for a hydrogen atom or a lower alkyl group or carboxyl group and Z for a side chain containing a carboxyl group, alkoxy-carbonyl group, amino group, substituted amino group, epoxy group or tetrahydro-furyl group, and (III) an overcoat layer applied to and cured on said undercoat layer in a thickness of at least about 1 micron, which overcoat is formed of a composition containing: as component (A) at least one hydrolyzate selected from the group of epoxy group-containing silicon compounds represented by the general formula (1): ##STR28## wherein, R 1 stands for an organic group containing an epoxy group, R 2 for a hydrogen atom, a hydrocarbon group of 1 to 6 carbon atoms, or vinyl group, R 3 for a hydrocarbon group of 1 to 5 carbon atoms, an alkoxy-alkyl group or an acyl group of 1 to 4 carbon atoms, a for an integer of 1 to 3 and b for an interger of 0 to 2, providing that a+b≦3 is satisfied; as component (B) at least one member selected from the group consisting of hydrolyzates of organic silicon compounds represented by the general formula (2): R.sub.c.sup.4 --Si--(OR.sup.5).sub.4-c ( 2) wherein, R 4 stands for a hydrocarbon group of 1 to 6 carbon atoms, vinyl group, methacryloxy group, amino group, mercapto group or organic group containing fluorine or chlorine, R 5 for a hydrocarbon group of 1 to 5 carbon atoms, an alkoxy-alkyl group or acyl group of 1 to 4 carbon atoms, and c for an integer of 0 to 3, and b for an interger of 0 to 3, colloidal silica and organic titanium compounds; and as component (C) a curing catalyst, wherein component (A) is used in an amount of 100 parts by weight (of solids, calculated as ##EQU9## and component (B) is used in an amount falling within the range of from 1 to 567 parts by weight (of solids, calculated as ##EQU10## in the case of an organic silicon compound of the general formula (2), as SiO 2 in the case of colloidal silica, or as ##EQU11## in the case of an organic titanium compound, wherein R 12 stands for an unhydrolyzed group containing no hydroxyl group and d for an integer of 1 to 4), said undercoating being of a thickness which promotes adhesion of the overcoating and said overcoating being of a thickness which gives satisfactory abrasion resistance and adhesion without cracking.