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Title:
LUBRICATING OIL COMPOSITION FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2010/032781
Kind Code:
A1
Abstract:
Disclosed is a lubricating oil composition for an internal combustion engine, which comprises a base oil having a viscosity index of 120 or more, a polymeric compound having a mass average molecular weight of less than 100,000 in an amount of 0.01 to 10 mass% inclusive, preferably 0.1 to 10 mass% inclusive, relative to the total amount of the composition, and a polymeric compound having a mass average molecular weight of 100,000 or more in an amount of less than 0.5 mass% relative to the total amount of the composition.  The composition has a viscosity index of 130 or more.

Inventors:
YAMADA RYO (JP)
Application Number:
PCT/JP2009/066242
Publication Date:
March 25, 2010
Filing Date:
September 17, 2009
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Assignee:
IDEMITSU KOSAN CO (JP)
YAMADA RYO (JP)
International Classes:
C10M169/04; C10M101/02; C10M129/76; C10M135/18; C10M139/00; C10M143/02; C10M143/04; C10M143/06; C10M143/10; C10M145/14; C10N10/12; C10N20/02; C10N20/04; C10N30/02; C10N40/25
Domestic Patent References:
WO2007119299A12007-10-25
WO2008093446A12008-08-07
Foreign References:
JP2005154760A2005-06-16
JP2008088215A2008-04-17
Other References:
See also references of EP 2333037A4
Attorney, Agent or Firm:
KINOSHITA & ASSOCIATES (JP)
Bottom intellectual property office of patent business corporation Tatsuyuki (JP)
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