Title:
LUBRICANT COMPOSITION
Document Type and Number:
WIPO Patent Application WO/2016/158622
Kind Code:
A1
Abstract:
Provided is a lubricant composition which has achieved a good balance between fuel consumption saving and extreme-pressure properties, while having shear stability, oxidation stability and wear resistance. Specifically, provided is a lubricant composition which is characterized by containing a base oil, a viscosity index improver, a molybdenum-based friction modifier, a boron-containing dispersant, and a sulfur/phosphorus-based extreme-pressure additive or at least two extreme-pressure additives selected from among a sulfur-based extreme-pressure additive, a phosphorus-based extreme-pressure additive and a sulfur/phosphorus-based extreme-pressure additive, and which is also characterized in that: the base oil is composed only of a synthetic oil; the base oil has a kinematic viscosity of from 3 mm2/s to 10 mm2/s (inclusive) at 100°C; the viscosity index improver is a resin having a number average molecular weight (Mn) of from 1,000 to 10,000 (inclusive); the mass ratio of the boron atoms (B) contained in the boron-containing dispersant to the molybdenum atoms (Mo) contained in the molybdenum-based friction modifier, namely (B)/(Mo) is from 1 to 5 (inclusive); and the mass ratio of the sulfur atoms (S) contained in the extreme-pressure additive(s) to the phosphorus atoms (P) contained in the extreme-pressure additive(s), namely (S)/(P) is from 10 to 20 (inclusive).
Inventors:
SUNAGAWA YOJI (JP)
Application Number:
PCT/JP2016/059250
Publication Date:
October 06, 2016
Filing Date:
March 23, 2016
Export Citation:
Assignee:
IDEMITSU KOSAN CO (JP)
International Classes:
C10M161/00; C10M135/00; C10M137/00; C10M139/00; C10M143/00; C10N10/12; C10N20/02; C10N20/04; C10N30/00; C10N30/06; C10N30/10; C10N40/04
Domestic Patent References:
| WO2009118984A1 | 2009-10-01 | |||
| WO2006126651A1 | 2006-11-30 |
Foreign References:
| JP2005517798A | 2005-06-16 | |||
| JP2003155495A | 2003-05-30 | |||
| JPH07331269A | 1995-12-19 | |||
| JPH08283762A | 1996-10-29 |
Other References:
See also references of EP 3279293A4
Attorney, Agent or Firm:
OHTANI, Tamotsu et al. (JP)
Tamotsu Otani (JP)
Tamotsu Otani (JP)
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