(19)
(11) EP 0 748 863 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.07.1997 Bulletin 1997/31

(43) Date of publication A2:
18.12.1996 Bulletin 1996/51

(21) Application number: 96109344.0

(22) Date of filing: 11.06.1996
(51) International Patent Classification (IPC)6: C10M 169/04, C10M 171/00
// (C10M169/04, 105:04, 143:00, 143:10, 143:16), C10N20:00, C10N20:04, C10N40:04
(84) Designated Contracting States:
DE FR GB

(30) Priority: 13.06.1995 JP 170233/95
21.12.1995 JP 349892/95

(71) Applicants:
  • COSMO RESEARCH INSTITUTE
    Tokyo (JP)
  • COSMO OIL COMPANY, LTD.
    Tokyo (JP)

(72) Inventors:
  • Sakata, Yasuyuki, c/o Cosmo Research Institute
    Satte-shi, Saitama-ken (JP)
  • Soga, Natsuhito, c/o Cosmo Research Institute
    Satte-shi, Saitama-ken (JP)
  • Kunoki, Toshio, c/o Cosmo Research Institute
    Satte-shi, Saitama-ken (JP)

(74) Representative: Wächtershäuser, Günter, Prof. Dr. 
Patentanwalt, Tal 29
80331 München
80331 München (DE)

   


(54) Traction drive fluid composition


(57) A traction drive fluid composition comprising the following component (A),

wherein R1 to R10 are hydrogen, C1-C3 alkyl, or cyclohexyl, Q1 to Q4 are C1-C3 alkyl or cyclohexyl, and n1 to n4 are an integer from 0 to 5; component (B) which is a heat copolymer of a cyclopentadiene compound and a vinyl aromatic hydrocarbon compound or a hydrogenated product of thereof having a softening point of 40°C or higher or a weight average molecular weight of 250 or larger; and, optionally, component (C) which is a compound with a viscosity smaller than that of component (A); a phosphorous compound; and a friction modifier. The composition exhibits a high traction coefficient over a wide temperature range and excellent friction characteristics required for a traction drive device.





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