Patent ID: 8399594

Claim:
A curable coating composition comprising (A) a blocked isocyanate silicone resin having an average formula (I) R 1 a (R 2 O) b SiO (4−(a+b)/2) , where each R 1 is monovalent and independently selected from an alkyl group, an aryl group, and a blocked isocyanate group having a general formula (II) —NHC(O)Z, where Z is a blocking agent such that at elevated temperatures it will dissociate and produce the corresponding isocyanate, which R 1 groups may be the same or different, R 2 is hydrogen or a monovalent C1 to C4 alkyl group, a is from 0.7 to 2.0, b is from 0 to 0.5, and (a+b) is 0.7 to 2.3, with the proviso that on average there is at least one blocked isocyanate group per silicone resin molecule, and wherein the blocked isocyanate has an equivalent weight of 150 to 1500; and (B) a functional silicone material, a functional organic material or a mixture thereof having in each case on average at least 2 carbon-bonded hydroxyl groups or aminofunctional hydrocarbon groups where the functional organic material is chosen from an organic polyol and an organic amine and the functional silicone material has an average formula R 6 n (R 2 O) m SiO (4−(n+m)/2) where each R 6 is monovalent and independently selected from a hydrogen atom, an alkyl group, an aryl group, a carbinol group free of aryl groups having at least 3 carbon atoms, an aryl-containing carbinol group having at least 6 carbon atoms, or an aminofunctional hydrocarbon group, which R 6 groups may be the same or different, R 2 is hydrogen or a monovalent C1 to C4 alkyl group, n is from 0.7 to 2.2, m is from 0 to 0.5, and m+n is 0.7 to 2.3, where the total mole ratio of blocked isocyanate groups to carbon-bonded hydroxyl+amino groups is 0.9:1 to 1.3:1, with the proviso when the functional silicone material is used there is on average at least 1 carbinol group or aminofunctional hydrocarbon group per molecule.