Coating compositions
with high solids
Patent No. U.S. 7,071,286 B2 E. I. duPont de Nemours and Co. has obtained a patent for a coating composition comprised of 20-80% weight 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 at least one orthoester compound with 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 three 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; 0-40% weight of at least one hydroxy-functional binder and/or hydroxy-functional reactive diluent, different from component and 80-20% weight of at least one cross-linking agent with functional groups reactive with hydroxyl groups, wherein the proportions of all the components add up to 100% weight.