(19)

(11)

EP 0 594 701 A1

(12)

(43) Date of publication: 04.05.1994 Bulletin 1994/18 (21) Application number: 92915095.0 (22) Date of filing: 09.07.1992

(51) International Patent Classification (IPC):  C10M 141/ 06( . ) H01B 3/ 20( . ) C10M 169/ 04( . ) (86) International application number: PCT/EP1992/001548 (87) International publication number: WO 1993/002165 (04.02.1993 Gazette 1993/04)

(84) Designated Contracting States: DE FR GB IT NL SE (30) Priority: 15.07.1991 FR 19910008879 (71) Applicant: Esso Société Anonyme Française F-92400 Courbevoie (FR)	(72) Inventors: BASLE-LE TURQUAIS, Elisabeth F-92500 Rueil-Malmaison (FR) VINCENT, Michel F-76130 Mont-Saint-Aignan (FR) (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)