LUBRICATING OIL COMPOSITION AND INTERNAL COMBUSTION ENGINE OIL

Title:

LUBRICATING OIL COMPOSITION AND INTERNAL COMBUSTION ENGINE OIL

Document Type and Number:

WIPO Patent Application WO/2004/044108

Kind Code:

A1

Abstract:

The invention aims at providing a lubricating oil composition which exhibits excellent low-temperature viscosity characteristics when used as automobile or industrial engine oil, gear oil, shock absorber oil, hydraulic oil, or the like, and an internal combustion engine oil comprising the composition. The lubricating oil composition comprises a lube base oil (A) which exhibits a kinematic viscosity of 1 to 50mm²/s at 100°C and a viscosity index of 80 or above, an ethylene/propylene copolymer (B) having the following characteristics (B1) to (B4), and, if necessary, a pour-point depressant (C): (B1) the ethylene content lies within the range of 30 to 75 % by weight, (B2) the limiting viscosity [&eegr ] lies within the range of 1.3 to 2.0dl/g, (B3) the Mw/Mn ratio is 2.4 or below, and (B4) the melting point is 30°C or below as determined by DSC.

Inventors:

KANESHIGE RYOUSUKE (JP)
OKADA KEIJI (JP)
KAWASAKI MASAAKI (JP)
IKEDA SATOSHI (JP)

Application Number:

PCT/JP2003/014311

Publication Date:

May 27, 2004

Filing Date:

November 11, 2003

Export Citation:

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Assignee:

MITSUI CHEMICALS INC (JP)
LUBRIZOL CORP (US)
KANESHIGE RYOUSUKE (JP)
OKADA KEIJI (JP)
KAWASAKI MASAAKI (JP)
IKEDA SATOSHI (JP)

International Classes:

C10M107/06; (IPC1-7): C10M143/04; C10M169/04

Domestic Patent References:

WO2000060032A1	2000-10-12
WO2000034420A1	2000-06-15

Foreign References:

EP0632066A1	1995-01-04
EP0188103A2	1986-07-23
GB2047266A	1980-11-26
JPH07150181A	1995-06-13
US20020035044A1	2002-03-21

Other References: