(19)

(11)

EP 0 765 373 A1

(12)

(43) Date of publication: 02.04.1997 Bulletin 1997/14 (21) Application number: 95923315.0 (22) Date of filing: 12.06.1995

(51) International Patent Classification (IPC):  C10M 165/ 00( . ) F02B 77/ 04( . ) C10M 163/ 00( . ) (86) International application number: PCT/EP1995/002271 (87) International publication number: WO 1995/034619 (21.12.1995 Gazette 1996/02)

(84) Designated Contracting States: BE DE ES FR GB IT NL (30) Priority: 16.06.1994 GB 19940012109 (71) Applicants: EXXON CHEMICAL LIMITED Abingdon, Oxfordshire OX13 6BB (GB) EXXON CHEMICAL PATENTS INC. Linden New Jersey 07036 (US)

(72) Inventors: ROBSON, Robert Abingdon, Oxfordshire OX14 1DS (GB) MACDONALD, Isabel, Petrina Wantage, Oxfordshire OX14 8LD (GB) CLEVERLEY, John, Arthur Didcot, Oxfordshire OX11 0BL (GB) DOWLING, Michael Reading, Berkshire RG8 9LH (GB) (74) Representative: Mansell, Keith Rodney, et al  Exxon Chemical Limited European Patents and Licences Exxon Chemical Technology Centre P O Box 1 Milton Hill, Abingdon, Oxfordshire OX13 6BB Milton Hill, Abingdon, Oxfordshire OX13 6BB (GB)