(19)

(11)

EP 0 847 435 A1

(12)

(43) Date of publication: 17.06.1998 Bulletin 1998/25 (21) Application number: 95920657.0 (22) Date of filing: 24.05.1995

(51) International Patent Classification (IPC):  C10M 141/ 10( . ) C10M 163/ 00( . ) (86) International application number: PCT/US1995/006620 (87) International publication number: WO 1996/037582 (28.11.1996 Gazette 1996/52)

(84) Designated Contracting States: BE DE ES FR GB IT NL (71) Applicant: EXXON RESEARCH AND ENGINEERING COMPANY Florham Park, New Jersey 07932-0390 (US)	(72) Inventors: YAMADA, Michiya Iruma-gun, Saitama-ken 356 (JP) ASANO, Satoshi Asaka-shi, Saitama-ken 351 (JP) TOMIZAWA, Hirotaka Tokorozawa-shi, Saitama-ken 359 (JP) (74) Representative: Fletcher Watts, Susan J., et al  ESSO Engineering (Europe) Limited, Patents and Licences, Mailpoint 72, Esso House, Ermyn Way Leatherhead, Surrey KT22 8XE Leatherhead, Surrey KT22 8XE (GB)