Patent ID: 7071286

Claim:
A coating composition comprising: A) 20–80 wt-% of at least one orthoester compound having at least one non-cyclic orthoester group and at least one free hydroxyl group per molecule, which compound is obtained by reacting a) at least one orthoester compound with b) at least one diol with a number average molecular weight (Mn) of 200–1000 g/mol, wherein solely diols are used having hydroxyl groups with different reactivity and having more than 3 carbon atoms between the hydroxyl groups and wherein the diol is selected from the group consisting of the reaction product of hydroxy carboxylic acids with at least one acid group and at least one hydroxyl group in the molecule and epoxy group containing compounds, the reaction product of hydroxyl carboxylic acids with at least one acid group and at least one hydroxyl group and linear diols or branched diols, and the reaction product of hydroxy carboxylic acid esters and linear diols or branched diols; B) 0–40 wt-% of at least one hydroxy-functional binder and/or hydroxy-functional reactive diluent, different from component A) and C) 80–20 wt-% of at least one cross-linking agent with functional groups reactive with hydroxyl groups, wherein the proportions of component A), B) and C) add up to 100 wt-%.