(19)

(11)

EP 0 616 636 A1

(12)

(43) Date of publication: 28.09.1994 Bulletin 1994/39 (21) Application number: 92916215.0 (22) Date of filing: 29.07.1992

(51) International Patent Classification (IPC):  C10M 167/ 00( . ) C10M 177/ 00( . ) C10M 169/ 04( . ) F02B 3/ 06( . ) (86) International application number: PCT/EP1992/001712 (87) International publication number: WO 1993/003126 (18.02.1993 Gazette 1993/05)

(84) Designated Contracting States: BE DE ES FR GB IT NL (30) Priority: 31.07.1991 GB 19910165274 (71) Applicant: EXXON CHEMICAL PATENTS INC. Florham Park New Jersey 07932 (US)	(72) Inventor: DOWLING, Michael Sheveocke Streatley Berkshire RG8 9LH (GB) (74) Representative: Northover, Robert Frank, et al  Exxon Chemical Limited Exxon Chemical Technology Centre PO Box 1 Abingdon Oxfordshire, OX13 6BB Abingdon Oxfordshire, OX13 6BB (GB)