Title:
TRANSMISSION FLUID COMPOSITION
Document Type and Number:
WIPO Patent Application WO/2007/058213
Kind Code:
A1
Abstract:
Disclosed is a transmission fluid composition having a kinematic viscosity at 100˚C of 2-10 mm2/s and a viscosity index of not less than 150, wherein the kinematic viscosity and the NOACK evaporation loss satisfy the following relation (I): X/3 + Y ≤ 6.33 (I) (wherein X represents the kinematic viscosity (mm2/s) at 100˚C and Y represents the NOACK evaporation loss (mass%) in 1 hour at 200˚C). Also disclosed is a transmission fluid composition comprising a base oil which contains at least one substance selected from an α-olefin oligomer obtained by oligomerizing an α-olefin by a specific method, a hydrogenated product of such an α-olefin oligomer and the like. Such transmission fluid compositions have low viscosity, extremely low evaporation loss, long metal fatigue life such as pitting resistance, high viscosity index, good low-temperature fluidity, good extreme pressure properties and good oxidation stability. Consequently, the transmission fluid compositions are suitable for various transmissions, in particular for automatic transmissions.
Inventors:
FUJITA HIROSHI (JP)
Application Number:
PCT/JP2006/322763
Publication Date:
May 24, 2007
Filing Date:
November 15, 2006
Export Citation:
Assignee:
IDEMITSU KOSAN CO (JP)
FUJITA HIROSHI (JP)
FUJITA HIROSHI (JP)
International Classes:
C10M105/04; C10M171/00; C10N20/00; C10N20/02; C10N30/00; C10N30/02; C10N30/06; C10N30/08; C10N30/10; C10N40/04; C10N60/02; C10N70/00
Domestic Patent References:
| WO2006073198A1 | 2006-07-13 | |||
| WO2006120925A1 | 2006-11-16 |
Foreign References:
| JP2001089779A | 2001-04-03 | |||
| JP2003528174A | 2003-09-24 | |||
| JP2005501957A | 2005-01-20 | |||
| JP2002518582A | 2002-06-25 | |||
| JPH07133234A | 1995-05-23 | |||
| JP2004262979A | 2004-09-24 |
Other References:
RONALD L SHUBKIN: "CRC Handbook of Lubrication and Tribology: Theory of Tribology", 1 January 1993, article "Polyalphaolefins", pages: 219 - 236
SHUBKIN, KERKEMEYER: "Tailor-making PAOs", JOURNAL OF SYNTHETIC LUBRICATION, vol. 8, no. 2, July 1991 (1991-07-01), pages 115 - 134
See also references of EP 1950277A4
SHUBKIN, KERKEMEYER: "Tailor-making PAOs", JOURNAL OF SYNTHETIC LUBRICATION, vol. 8, no. 2, July 1991 (1991-07-01), pages 115 - 134
See also references of EP 1950277A4
Attorney, Agent or Firm:
OHTANI, Tamotsu et al. (Bridgestone Toranomon Bldg. 6F 25-2, Toranomon 3-chome, Minato-k, Tokyo 01, JP)
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