(19)
(11) EP 0 881 277 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.09.1999 Bulletin 1999/36

(43) Date of publication A2:
02.12.1998 Bulletin 1998/49

(21) Application number: 98304251.6

(22) Date of filing: 29.05.1998
(51) International Patent Classification (IPC)6: C10M 135/10, C10M 159/24
// C10N30:06
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 31.05.1997 JP 157921/97
31.03.1998 JP 104021/98

(71) Applicant: TONEN CORPORATION
Chiyoda-Ku, Tokyo 100 (JP)

(72) Inventors:
  • Taguchi, Shigeko
    Kawagoe City, Saitama (JP)
  • Ono, Megumi
    Tachikawa City, Tokyo (JP)
  • Tomizawa, Hirotaka
    Tokorozawa City, Tokyo (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)

   


(54) Friction modifier comprising metal sulfonate and lubricating oil composition containing the same


(57) Novel metal sulfonates having friction reducing ability and also various lubricating oil compositions containing the metal sulfonates are disclosed. The metal sulfonates which provide a friction modifier comprise a metal sulfonate composed of an organic sulfonic group, which contains a hydrocarbon group, and a metal. The hydrocarbon group of the organic sulfonic group is a chain hydrocarbon group or an aromatic group with at least one chain hydrocarbon group bonded thereto. The chain hydrocarbon group has an alkyl chain linearity of 20% or higher as determined by a carbon nuclear magnetic resonance measurement (13C-NMR measurement). Lubricating oil compositions added with the metal sulfonate are also provided.





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