(19)

(11)

EP 0 964 903 A1

(12)

(43) Date of publication: 22.12.1999 Bulletin 1999/51 (21) Application number: 98908532.0 (22) Date of filing: 11.02.1998

(51) International Patent Classification (IPC):  C10G 35/ 095( . ) (86) International application number: PCT/US1998/002747 (87) International publication number: WO 1998/036037 (20.08.1998 Gazette 1998/33)

(84) Designated Contracting States: DE FR GB IT NL (30) Priority: 18.02.1997 US 19970035405P 18.04.1997 US 19970844711 (71) Applicant: EXXON CHEMICAL PATENTS INC. Baytown, TX 77520-5200 (US)	(72) Inventor: KAO, Jar-Lin Houston, TX 77059 (US) (74) Representative: Dew, Melvyn John, et al  Exxon Chemical Europe Inc. P.O.Box 105 1830 Machelen 1830 Machelen (BE)