COATING AGENTS FOR THE PRODUCTION OF TRANSPARENT FINISHING COATS AND THE USE OF SUCH COATING AGENTS IN THE PRODUCTION OF MULTI-COAT COATINGS

摘要

PCT No. PCT/EP95/01095 Sec. 371 Date Jan. 22, 1996 Sec. 102(e) Date Jan. 22, 1996 PCT Filed Mar. 23, 1995 PCT Pub. No. WO95/26375 PCT Pub. Date Oct. 5, 1995The present invention is directed to a coating composition for use as topcoat lacquer on a multi-layer lacquer coating for substrates such as automobile bodies and parts. The coating composition is based upon a combination of hydroxyl-functional methacrylic copolymers, carboxy-functional blocked urethane prepolymers, crosslinking agents and optional hydroxyl-functional polyesters. The carboxy-functional polyurethane prepolymer is formed from a combination of organic diols, polycarboxylic acids, polyols, hydroxyl-carboxylic acids, aliphatic or aryl polyisocyanates and monofunctional isocyanate blocking agents. The lacquer coating according to the invention has a high sulfuric acid resistance and has a high solids content.