Abstract: A protection method for molded-plastic surfaces comprising the steps of:forming on the molded-plastics surface a first film from a composition including(A) acrylic polyol, 5 to 80 parts by weight,(B) polyalkyl methacrylate, 95 to 20 parts by weight and(C) isocyanate compound as an isocyanate group 0.5 to 20 equivalents with respect to 1 equivalent of a hydroxyl group in (A); andforming on the first film a second film from a composition including(D) organosilanetriol, represented by R.sup.1 Si(OH).sub.3 wherein R.sup.1 represents a monovalent group selected from the group consisting of an alkyl group having 1 to 3 carbon atoms and an aryl group, and/or a partial condensate thereof, 10 to 90 parts by weight and(E) colloidal silica, 90 to 10 parts by weight.

Abstract: A coating composition which is intended to improve surface hardness of plastics materials comprising components:(A) 5 to 45% by weight of an organosilanetriol expressed by the formula R.sup.1 Si(OH).sub.3, wherein R.sup.1 represents a monovalent hydrocarbon group, and/or a partial condensate thereof;(B) 45 to 5% by weight as solids of colloidal silica; and(C) 40 to 60% by weight of a solvent containing an aliphatic alcohol having from 1 to 6 carbon atoms, and/or ethylene glycol monoethyl ether acetate,in an amount such that the total of the above components is 100 parts by weight, and mixed therein(D) a catalyst dispersion containing 0.1 to 5 parts by weight of a compound expressed by the formula (R.sup.2).sub.4 NOCHO, wherein R.sup.2 can be the same or different and represents an alkyl group having carbon number of from 1 to 2, and 100 parts by weight of an aliphatic alcohol having carbon number of from 1 to 6, so long as the compound expressed by the formula (R.sup.2).sub.4 NOCHO is 0.1 to 0.

Abstract: An ethylidenenorbornyl dimethylmethacryloxysilane represented by the general formula (I): ##STR1## wherein Y represents the formula: ##STR2## or the formula: ##STR3##