Coating compositions.

摘要

A coating composition comprising (A) a vinyl copolymer containing a hydroxyl group and a hydrolyzable silyl group, (B) an organopolysiloxane of the formula: R1_aXbSiO(4-a-b)/2 wherein R<1> is a C1-10 hydrocarbon group, X is hydroxyl or an alkoxy, alkenoxy, acetoxy or ketoxime group having 1 - 6 carbon atoms, and a and b are positive numbers: 0 < a < 2, 0 < b < 3, and 0 < a + b < 4, (C) a condensation catalyst, and optionally (D) an organosilane of the formula: R1_cSiY4-c wherein R<1> is as defined above, Y is an alkoxy, alkenoxy, acetoxy or ketoxime group having 1 - 6 carbon atoms, and c is equal to 0, 1 or 2. The composition can firmly adhere to various inorganic substrates, especially stainless steel and form a coating having improved resistance to weather, water, stains and alkalis.