(19)

(11)

EP 0 928 297 A1

(12)

(43) Date of publication: 14.07.1999 Bulletin 1999/28 (21) Application number: 97936513.0 (22) Date of filing: 19.08.1997

(51) International Patent Classification (IPC):  C08F 4/ 642( . ) C08F 4/ 639( . ) C08F 10/ 00( . ) C08F 4/ 6392( . ) (86) International application number: PCT/US1997/014533 (87) International publication number: WO 1998/013393 (02.04.1998 Gazette 1998/13)

(84) Designated Contracting States: BE DE ES FR GB IT NL (30) Priority: 24.09.1996 US 19960026644P (71) Applicant: EXXON CHEMICAL PATENTS INC. Baytown, TX 77520-5200 (US)	(72) Inventor: CHANG, Main Houston, TX 77061 (US) (74) Representative: UEXKÜLL & STOLBERG  Patentanwälte Beselerstrasse 4 22607 Hamburg 22607 Hamburg (DE)