(19)

(11)

EP 0 667 875 A1

(12)

(43) Date of publication: 23.08.1995 Bulletin 1995/34 (21) Application number: 93925170.0 (22) Date of filing: 05.11.1993

(51) International Patent Classification (IPC):  C08F 10/ 00( . ) (86) International application number: PCT/US1993/010653 (87) International publication number: WO 1994/011409 (26.05.1994 Gazette 1994/12)

(84) Designated Contracting States: AT BE DE ES FR GB GR IT NL PT SE (30) Priority: 06.11.1992 US 19920972402 (71) Applicant: SHELL OIL COMPANY Houston, Texas 77252-2463 (US)	(72) Inventor: MORSE, David, Bell Houston, TX 77077 (US) (74) Representative: Ellis-Jones, Patrick George Armine, et al  J.A. KEMP & CO. 14 South Square Gray's Inn London WC1R 5LX London WC1R 5LX (GB)