Patent ID: 7608303

Claim:
A process for coating an auto body or auto part which comprises applying a base coating of a pigmented coating composition to a substrate; applying a top-coating of a clear coating over the base coating; and curing the base coating and top-coating to form a base coat/ clear coat finish on the substrate, wherein wherein the improvement comprises using as the clear top-coating, a clear coat composition which comprises a binder consisting essentially of a. polyisocyanate crosslinking agent; b. an isocyanate-reactive component having at least one compound having the following formula: wherein n on average is 1.7 to 2 and X is a cycloaliphatic norbornane derivative of formula (II) or a mixture of isomers thereof; k =0, 1 or 2 and the bridging CH 2 group may be on the same or opposite side with respect the first bridging CH 2 group, R 20 , R 21 , R 22 , can be the same or different and are each independently H, a C 1 to C 20 alkyl group, a C 1 to C 20 alkyl group substituted with a hydroxyl group, a C 1 to C 18 perfluoroalkyl group, a phenyl group, a C 6 to C 20 aryl group substituted with a C 1 to C 12 alkyl group, a C 6 to C 20 aryl group substituted with a hydroxyl group, a C(O)OR 29 group (with R 29 selected to be a C 1 to C 20 linear or branched or cyclic alkyl group or a C 6 to C 20 aryl group), with the proviso that R 20 , R 21 and R 22 can not all be H; and R 1 and R 2 are the same or different organic groups that are inert to isocyanate groups and each are from the group of C2-C4 alkyl groups, or C 6 -C 18 linear or branched alkyl groups.