(19)

(11)

EP 0 226 637 A1

(12)

(43) Date of publication: 01.07.1987 Bulletin 1987/27 (21) Application number: 86904997.0 (22) Date of filing: 01.05.1986

(51) International Patent Classification (IPC):  C08G 65/ 40( . ) C08G 65/ 48( . ) (86) International application number: PCT/US1986/000904 (87) International publication number: WO 1986/007368 (18.12.1986 Gazette 1986/27)

(84) Designated Contracting States: DE FR GB (30) Priority: 12.06.1985 US 19850743957 (71) Applicant: AMOCO CORPORATION Chicago Illinois 60680 (US)	(72) Inventors: CLENDINNING, Robert, Andrew New Providence, NJ 07974 (US) KWIATKOWSKI, George, Thomas Somerset, NJ 08812 (US) (74) Representative: Laredo, Jack Joseph  Elkington and Fife Prospect House 8 Pembroke Road Sevenoaks, Kent TN13 1XR Sevenoaks, Kent TN13 1XR (GB)