VISCOSITY INDEX IMPROVER, PROCESS FOR PREPARING THE SAME AND LUBRICATING OIL COMPOSITION

Title:

VISCOSITY INDEX IMPROVER, PROCESS FOR PREPARING THE SAME AND LUBRICATING OIL COMPOSITION

Document Type and Number:

WIPO Patent Application WO/1997/017417

Kind Code:

A1

Abstract:

A viscosity index improver for addition to lubricating oil or the like, which comprises a graft copolymer having structural units of an oil-soluble polymer (a) comprising an olefin polymer and sttructural units of a copolymer (b) of a monomer having a peroxide bond with a (meth)acrylate or the like or a copolymer (c) of a monomer having a peroxide bond with 2-hydroxyethyl (meth)acrylate or the like. The improver is excellent in the effect of improving the viscosity index, the thickening effect, the fluidity at low temperatures and the shear stability, and has no fear of causing phase separation in lubricating oil.

Inventors:

SUYAMA SHUJI (JP)
HIGUCHI YOSHIKI (JP)
TOCHIGI HIDEFUMI (JP)
OHMURA HIROSHI (JP)

Application Number:

PCT/JP1996/003251

Publication Date:

May 15, 1997

Filing Date:

November 07, 1996

Export Citation:

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Assignee:

NOF CORP (JP)
SUYAMA SHUJI (JP)
HIGUCHI YOSHIKI (JP)
TOCHIGI HIDEFUMI (JP)
OHMURA HIROSHI (JP)

International Classes:

C10M145/14; C10M145/16; C10M149/04; C10M149/10; C10M157/00; C10M157/04; (IPC1-7): C10M157/10

Foreign References:

JPH0586114A	1993-04-06
JPS5865246A	1983-04-18
JPS5339305A	1978-04-11

Other References: