Coatings for thermoplastics

Details Coatings for thermoplastics Coatings for thermoplastics

C - Chemistry, Metallurgy

09

D

117/184, 400/530

C09D 183/04 (2006.01) C08G 18/61 (2006.01) C08J 7/04 (2006.01) C08K 5/09 (2006.01)

Patent

CA 1165492

Abstract of the Disclosure A coating composition to improve the abrasion and scratch resistance of plastics such as polycarbonate, consisting essentially of about A) 10-40% by weight of a partially hydrolyzed siloxane compound which is obtained by hydrolyzing in water at about 50-80°C over a period of about 1-12 hours at least one of (a) a hydrocarbon-trialkoxysilane of the formula R1Si(OR")3 wherein R' is an alkyl group with 1 to 4 carbon atoms or a phenyl or vinyl group, and R" is an alkyl group with 1 to 4 carbon atoms, (b) a co-condensation product of (a) and about 1 to 40% by weight of a phenyl- or vinyl-trialkoxysilane, the alkoxy group containing 1 to 4 carbon atoms, (c) a co-condensation product of 1 mol of (a) and 0.05 to 1 mol of a tetraalkoxysilane, in which the alkoxy group contains 1 to 4 carbon atoms, and (d) a co-condensation product of 1 mol of (a) and 0.05 to 1 mol of a dialkyldialkoxysilane, in which the alkyl and alkoxy groups contain 1 to 4 carbon atoms, B) 0 to 40% by weight of an aqueous dispersion of colloidal silicon dioxide, C) 0 to 5% by weight of an etherified methylolmelamine, D) 0.05 to 15% by weight of a blocked polyisocyanate, E) 0. 5 to 30% by weight of acetic acid, and F) an inert organic solvene as the remainder.

349319

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