Title:
VISCOSITY INDEX IMPROVER AND LUBRICATING OIL COMPOSITION
Document Type and Number:
Japanese Patent JP3831203
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a viscosity index improver excellent in viscosity index improving ability, and besides a lubricating oil composition containing it.
SOLUTION: The viscosity index improver contains a polymer (A) comprising as the constitutional monomer a monomer expressed by formula 1 (wherein, R1 is hydrogen or methyl group; X is a 2-4C alkylene group; n is an integer of 0 to 20, a mean of n(s) being 0 to 10, and X in a case when n is two or more, may be mutually the same or different; a part of (XO)n may be either a random addition or a block addition; and R2 is a 16-36C branched alkyl group) and satisfying a weight-average molecular weight of 5,000 to 50,000, a solubility parameter of 8.6 to 9.5, a beginning crystallization beginning temperature of -15°C or lower, and a steric hindrance factor of from more than 0 to less than 15; and the lubricating oil composition contains these.
Inventors:
Takeshi Yuki
Application Number:
JP2001109164A
Publication Date:
October 11, 2006
Filing Date:
April 06, 2001
Export Citation:
Assignee:
SANYO CHEMICAL INDUSTRIES,LTD.
International Classes:
C09K3/00; C08F20/10; C10M145/14; C10M145/16; C10M147/02; C10M149/00; C10M149/02; C10M149/04; C10M149/06; C10M149/10; C10M151/02; C10M153/02; C10M171/00; C08F20/18; C08F20/28; C08F20/34; C10N10/02; C10N10/04; C10N20/00; C10N20/02; C10N20/04; C10N30/00; C10N30/02; C10N30/06; C10N40/04; C10N40/08; C10N40/25; (IPC1-7): C10M145/14; C08F20/10; C10M145/16; C10M147/02; C10M149/00; C10M149/06; C10M149/10; C10M151/02; C10M153/02; //C10N10:02; C10N10:04; C10N20:00; C10N20:02; C10N20:04; C10N30:02; C10N40:04; C10N40:08; C10N40:25
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