Patent ID: 6428854
Filing Date: 2002-08-06
Classification: C08G,C09D,Y10T

Abstract:
A process for coating a substrate comprisinga) applying onto a substrate a one-component stoving composition, which has a storage stability of greater than 2 weeks at room temperature and comprises A) a polyhydroxy component comprising one or more compounds having at least 2 hydroxyl groups selected from the groups consisting of polyacrylates, polyesters, polycarbonates, polyethers, polyurethanes, polydiene resins, and epoxy resins; the polyhydroxy component being substantially free from amino groups, B) a cross-linking component comprising one or more compounds selected from the group consisting of compounds containing at least two cyclic carbonate groups in the form of six-membered rings which are the urethane group-containing reaction products of a hydroxy-functional compound containing a cyclic carbonate group in the form of a six-membered ring with a polyisocyanate compound having an average NCO functionality of at least two; the cross-linking component being capable of reacting with the polyhydroxy component and C) a catalyst component comprising a catalyst selected from the group consisting of metal carboxylates containing at least one metal from groups IA, IB, IIA, IIB, IVA or IVB of the periodic table and at least one carboxylate group compound corresponding to the formula Râ€”COOâ€”, wherein R is a linear or branched alkyl group having 1 to 20 carbon atoms, wherein the polyhydroxy component and the crosslinking agent component are present at an equivalent ratio of carbonate groups to OH groups of 0.5:1 to 2.0:1, and b) baking the composition at a temperature sufficiently high to form the coating.