Coating composition and article coated thereby

Claim 1

A scratch-resistant coating composition capable of forming a coating having a high refractive index on a transparent solid material, said coating composition comprising: (A) 100 parts by weight of an epoxy group-containing silicon compound of the general formula: R.sup.1 R.sup.2.sub.n Si(OR.sup.3).sub.3-n wherein R 1 is an epoxy-containing group having 2 to 12 carbon atoms, R 2 is an alkyl, alkenyl or halogenated alkyl group having 1 to 6 carbon atoms or a halogenated aryl group, R 3 is a hydrogen atom or an alkyl, acyl or alkylacyl group having 1 to 4 carbon atoms, and n is an integer of 0 to 2, or a partial hydrolysis product thereof, (B) 0 to 100 parts by weight of an organosilicon compound of the general formula: R.sup.4.sub.p R.sup.2.sub.q Si(OR.sup.3).sub.4-p-q wherein R 2 and R 3 are as defined above for (A), R 4 is an alkyl or halogenated alkyl group having 1 to 4 carbon atoms, an aryl or halogenated aryl group having 6 to 12 carbon atoms, a methacryloxalkylene group having 5 to 8 carbon atoms, or a ureidoalkylene, aromatic ureidoalkylene, halogenated aromatic alkylene or a mercaptoalkylene group having 2 to 10 carbon atoms, p is an integer of 1 to 3 and q is an integer of 0 to 2, or a partial hydrolysis product thereof, (C) 0 to 130 parts by weight of at least one metal oxide selected from the group consisting of antimony oxide, tin oxide and titanium oxide, said metal oxide being in the form of a sol, (D) 0.25 to 30 parts by weight of a cross-linking agent for (A), said cross-linking agent being a polycyclic polycarboxylic acid or an anhydride thereof, or a polycyclic halogenated polycarboxylic acid or an anhydride thereof, and (E) 0.01 to 30 parts by weight of a curing catalyst, said composition containing no metal oxide other than (C).