(19)

(11)

EP 0 468 032 A1

(12)

(43) Date of publication: 29.01.1992 Bulletin 1992/05 (21) Application number: 91904488.0 (22) Date of filing: 28.01.1991

(51) International Patent Classification (IPC):  C10G 1/ 00( . ) C10G 1/ 06( . ) (86) International application number: PCT/US1991/000562 (87) International publication number: WO 1991/012297 (22.08.1991 Gazette 1991/19)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 15.02.1990 US 19900481345 (71) Applicant: AMOCO CORPORATION Chicago, IL 60680-0703 (US)	(72) Inventor: JOSEPH, Joseph, Thenganpallil Naperville, IL 60563-1960 (US) (74) Representative: Laredo, Jack Joseph, et al  Elkington and Fife Prospect House 8 Pembroke Road Sevenoaks, Kent TN13 1XR Sevenoaks, Kent TN13 1XR (GB)