(19)

(11)

EP 0 522 057 A1

(12)

(43) Date of publication: 13.01.1993 Bulletin 1993/02 (21) Application number: 91907532.0 (22) Date of filing: 25.03.1991

(51) International Patent Classification (IPC):  C08F 4/ 52( . ) C08F 10/ 00( . ) C08F 4/ 42( . ) C08F 10/ 08( . ) (86) International application number: PCT/US1991/002012 (87) International publication number: WO 1991/014719 (03.10.1991 Gazette 1991/23)

(84) Designated Contracting States: BE DE FR GB (30) Priority: 26.03.1990 US 19900499134 (71) Applicant: EXXON CHEMICAL PATENTS INC. Linden, New Jersey 07036-0710 (US)	(72) Inventor: CHEN, Frank, Joung-Yei Edison, NJ 08820 (US) (74) Representative: Northover, Robert Frank, et al  Exxon Chemical Limited Exxon Chemical Technology Centre PO Box 1 Abingdon Oxfordshire, OX13 6BB Abingdon Oxfordshire, OX13 6BB (GB)