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Title:
VISCOSITY INDEX IMPROVER AND LUBRICANT COMPOSITION
Document Type and Number:
Japanese Patent JP2014224246
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a viscosity index improver which realizes excellent shear stability of a lubricant composition and low HTHS viscosity of the lubricant composition and hardly increases low-temperature viscosity of the lubricant composition.SOLUTION: A viscosity index improver contains a copolymer (A) whose essential constituent monomers are a monomer (a) represented by the general formula (1), a monomer (b) represented by the general formula (2), and a (meth)acrylic acid alkyl ester (c) having a C1-4 linear alkyl group. In the viscosity index improver, Ris a polymer residue obtained by removing one H from a hydrocarbon polymer whose essential component is isobutylene and/or 1,2-butylene in the general formula (1), In the viscosity index improver, the absolute value of the difference between the SP value of (A) and the SP value of a base oil is 0.5 to 1.6.

Inventors:
NAKADA SHIGEKUNI
SAKAGUCHI AYUMI
TATSUMI TAKENORI
YAMASHITA HIROKI
Application Number:
JP2014084907A
Publication Date:
December 04, 2014
Filing Date:
April 16, 2014
Export Citation:
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Assignee:
SANYO CHEMICAL IND LTD
International Classes:
C10M145/14; C10M149/06
Domestic Patent References:
JP2008546894A2008-12-25
JP2002302687A2002-10-18
JP2010532805A2010-10-14
JPH06306130A1994-11-01