Patent ID: 7871675

Claim:
A process for preparing a coating on a substrate, comprising applying a coating formulation (B) which is storage stable but which cures in the presence of moisture to a coating having a pencil hardness according to ISO 15184 of at least HB to the substrate, the coating formulation comprising at least one prepolymer (A) which bears at least one hydrolyzable functionality of the formula (6) —X—CH 2 —Si(OR) 3-x R′ x (6) in which R each, independently, is hydrogen, or an alkyl or cycloalkyl radical having 1 to 6 carbon atoms, the carbon chain being uninterrupted or interrupted by non-adjacent oxygen, sulfur or NR″ groups, R′ each, independently, is an alkyl, cycloalkyl, aryl or arylalkyl radical having 1 to 12 carbon atoms, the carbon chain being uninterrupted or interrupted by nonadjacent oxygen, sulfur or NR″ groups, X is oxygen or a group of the formula (20) —O—CO—NR″— (20) wherein R″ each, independently, is hydrogen, an alkyl, cycloalkyl, aryl, aminoalkyl or aspartate ester radical, and x is 0 or 1, wherein at least one silicon-bonded alkoxy group is present as a hydrolyzable functionality, wherein the hydrolyzable functionality (6) is derived by preparing the prepolymer (A) from at least one α-silane selected from the group consisting of the formulae propylene oxide-O—CH 2 —Si(OR) 3-x R′ x (8), and OCN—CH 2 —Si(OR) 3-x R′ x (9), and curing the coating by exposure to moisture.