Patent ID: 6846567

Claim:
A surface-protected plastic composite material comprising a transparent plastic, a coating layer (I) as a first layer stacked on the transparent plastic substrate and a thermally cured coating layer (II) as a second layer stacked on the first layer, the coating layer (I) being formed of a resin composition containing at least 50% by weight, based on the resin content thereof, of an acrylic resin which is an acrylic resin containing at least 50 mol % of recurring unit of the following formula (I-a), wherein R 1 is an alkyl group having 1 to 4 carbon atoms, the thermally cured coating layer (II) being made of an organosiloxane resin formed from the following components a, b and c, (A) colloidal silica (component a), (B) a hydrolysis condensate (component b) of a trialkoxysilane of the following formula (II-1), R 2 Si(OR 3 ) 3 (II-1), wherein R 2 is an alkyl group having 1 to 4 carbon atoms, a vinyl group or an alkyl group which has 1 to 3 carbon atoms and is substituted with at least one group selected from the group consisting of methacryloxy, amino, glycidoxy and 3,4-epoxycyclohexyl and R 3 is an alkyl group having 1 to 4 carbon atoms, wherein, methyltrialkoxysilane consitutes at least 70% by weight of the entire trialkoxysilanes, and (C) a hydrolysis condensate (component c) of a tetraalkoxysilane of the following formula (II-2), Si(OR 4 ) 4 (II-2) wherein R 4 is an alkyl group having 1 to 4 carbon atoms, the organosiloxane resin containing 5 to 45% by weight of the component a, 50 to 80% by weight, as R 2 SiO 3/2 , of the component b and 2 to 30% by weight, as SiO 2 , of the component c.