Coating composition

A transparent, abrasion-resistant coating composition having high adhesiveness for transparent polymers, which comprises:

• as component (A), at least one hydrolyzate selected from the group of epoxy group-containing silicon compounds represented by the general formula (1):
• ##STR10## wherein, R.sup.1 stands for an organic group containing an epoxy group, R.sup.2 for hydrogen atom, a hydrocarbon group having 1 to 6 carbon atoms or vinyl group, R.sup.3 for a hydrocarbon group having 1 to 5 carbon atoms, alkoxyalkyl group or acyl group having 1 to 4 carbon atoms, a for an integer of 1 to 3 and b for an integer of 0 to 2, providing that a+b.ltoreq.3 is satisfied, said one hydrolyzate being used in an amount of 100 parts by weight (of solids;
• calculated as ##EQU11## 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.sup.4 stands for a hydrocarbon group having 1 to 6 carbon atoms, vinyl group, methacryloxy group, amino group, mercapto group, or organic group containing fluorine or chlorine, R.sup.5 for a hydrocarbon group having 1 to 5 carbon atoms, alkoxyalkyl group or acyl group having 1 to 4 carbon atoms and c for an integer of 0 to 3;
• colloidal silica and organic titanium compounds, said one member being used in an amount within the range of from 1 to 567 parts by weight (of solids, calculated as R.sub.c.sup.4 --Si--O.sub.(4-c)/2 in the case of an organic silicon compound represented by the general formula (2), as SiO.sub.2 in the case of colloidal silica or as R.sub.d.sup.6 --Ti--O.sub.(4-d)/2 in the case of an organic titanium compound, wherein R.sup.6 stands for an unhydrolyzed group containing no hydroxy group and d for an integer of 1 to 4);
• and as component (C), a curing catalyst selected from the group consisting of ammonium perchlorate and ammonium chloride.