(19)

(11)

EP 0 719 314 A1

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(43) Date of publication: 03.07.1996 Bulletin 1996/27 (21) Application number: 94926291.0 (22) Date of filing: 09.09.1994

(51) International Patent Classification (IPC):  C10M 141/ 10( . ) C10N 10/ 12( . ) C10N 30/ 06( . ) C10M 163/ 00( . ) C10N 20/ 02( . ) (86) International application number: PCT/GB1994/001971 (87) International publication number: WO 1995/007964 (23.03.1995 Gazette 1995/13)

(84) Designated Contracting States: AT BE CH DE ES FR GB IE IT LI LU NL PT SE (30) Priority: 13.09.1993 GB 19930018895 13.09.1993 GB 19930018896 (71) Applicant: EXXON RESEARCH AND ENGINEERING COMPANY Florham Park, New Jersey 07932-0390 (US)

(72) Inventors: HOLT, David, Gary, Lawton Cippenham Slough Berks SL1 6JS (GB) VERNON, Patrick, Desmond, Fraser Littlemore Oxford OX4 4PE (GB) ATHERTON, John, Ian Cassington Oxon OX8 1 DW (GB) (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)