(19)

(11)

EP 1 325 041 A2

(12)

(88) Date of publication A3: 27.06.2002 (43) Date of publication: 09.07.2003 Bulletin 2003/28 (21) Application number: 01971055.7 (22) Date of filing: 17.09.2001

(51) International Patent Classification (IPC)7: C08F 6/00, C08F 6/28 (86) International application number: PCT/US0128/890 (87) International publication number: WO 0202/8916 (11.04.2002 Gazette 2002/15)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 04.10.2000 US 678814 (71) Applicant: CHEVRON PHILLIPS CHEMICAL COMPANY LP Houston, TX 77010 (US)	(72) Inventors: CHING, Ta, Yen Novato, CA 94945 (US) CAI, Gangfeng Danville, CA 94526 (US) YANG, Hu San Ramon, CA 94583 (US) (74) Representative: Nash, David Allan  Haseltine Lake,Imperial House,15-19 Kingsway London WC2B 6UD London WC2B 6UD (GB)