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Title:
VISCOSITY INDEX IMPROVER AND LUBRICANT COMPOSITION
Document Type and Number:
Japanese Patent JP2013129730
Kind Code:
A
Abstract:

To provide a viscosity index improver which has a high viscosity index improving effect and hardly leads to rise of low-temperature viscosity of a lubricant composition.

The viscosity index improver contains a polymerizable unsaturated group-containing polymer (Y); and a (co)polymer (A) having a monomer (a) represented by general formula (1) as an essential component monomer. (Y) is a polymer having at least one polymerizable unsaturated group-containing hydrocarbon compound (x) as a component monomer, the average value of the number of polymerizable unsaturated groups of (Y) is 0.8-1.5, and the solubility parameter of (A) is 7.3-9.5 (cal/cm3)1/2. The lubricant composition contains the viscosity index improver and a base oil.


Inventors:
NAKADA SHIGEKUNI
SAKAGUCHI AYUMI
Application Number:
JP2011279520A
Publication Date:
July 04, 2013
Filing Date:
December 21, 2011
Export Citation:
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Assignee:
SANYO CHEMICAL IND LTD
International Classes:
C10M145/14; C10M149/02; C10M149/06; C10M153/02; C10N20/00; C10N20/02; C10N20/04; C10N30/02; C10N40/04; C10N40/06; C10N40/08; C10N40/25
Domestic Patent References:
JP2003292938A2003-10-15
JPH08311133A1996-11-26
JP2003292938A2003-10-15
JPH08311133A1996-11-26
Foreign References:
WO2010102903A12010-09-16
WO2010102903A12010-09-16