Title:
GREASE COMPOSITION AND MACHINE COMPONENT
Document Type and Number:
WIPO Patent Application WO/2011/019028
Kind Code:
A1
Abstract:
Disclosed is a grease composition comprising a base oil, a thickening agent and an additive. The grease composition is characterized in that the base oil has a kinematic viscosity of 50 to 200 mm2/s at 40˚C, the thickening agent comprises a diurea compound represented by general formula (I): R1-NHCONH-R2-NHCONH-R3 (wherein R2 represents a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms; and R1 and R3 are the same as or different from each other and independently represent a cyclohexyl group, or a linear or branched alkyl group having 8 to 22 carbon atoms), the additive is at least one component selected from the group consisting of a metal salt of naphthenic acid, a salt of a fatty acid having 6 to 10 carbon atoms and an aliphatic amine having 6 to 10 carbon atoms, and a metal salt of an organic sulfonic acid. The composition exhibits excellent fretting resistance at a temperature ranging from ambient temperature to a lower temperature (e.g., -50°C, preferably about -40°C).
Inventors:
YAMAMOTO MASAMICHI (JP)
Application Number:
PCT/JP2010/063521
Publication Date:
February 17, 2011
Filing Date:
August 10, 2010
Export Citation:
Assignee:
KYODO YUSHI (JP)
YAMAMOTO MASAMICHI (JP)
YAMAMOTO MASAMICHI (JP)
International Classes:
C10M169/00; C10M101/02; C10M115/08; C10M129/58; C10M133/06; C10M159/24; C10N10/04; C10N20/02; C10N30/00; C10N40/00; C10N40/02; C10N40/04; C10N40/32; C10N50/10
Domestic Patent References:
| WO2008117819A1 | 2008-10-02 | |||
| WO2009093685A1 | 2009-07-30 |
Foreign References:
| JPH11172276A | 1999-06-29 | |||
| JPH09324190A | 1997-12-16 | |||
| JP2009029981A | 2009-02-12 | |||
| JP2004051912A | 2004-02-19 | |||
| JP2001234935A | 2001-08-31 | |||
| JP2005298537A | 2005-10-27 |
Other References:
See also references of EP 2465916A4
YUJI YAMAMOTO ET AL.: "Tribology", 25 November 1999, RIKOGAKUSHA PUBLISHING CO., LTD., pages: 201 - 203
T. ENDO, EUROGREASE, November 1997 (1997-11-01), pages 25 - 40
YUJI YAMAMOTO ET AL.: "Tribology", 25 November 1999, RIKOGAKUSHA PUBLISHING CO., LTD., pages: 201 - 203
T. ENDO, EUROGREASE, November 1997 (1997-11-01), pages 25 - 40
Attorney, Agent or Firm:
TSUJII Koichi et al. (JP)
辻居 Koichi (JP)
辻居 Koichi (JP)
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