Viscosity index improver and lubricating oil composition

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United States of America Patent

PATENT NO 9683195
APP PUB NO 20170009177A1
SERIAL NO

15117883

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Abstract

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The present invention aims to provide a viscosity index improver excellent in shear stability and having a low HTHS viscosity and a high viscosity index. The viscosity index improver of the present invention contains a (co)polymer (A) containing a polyolefin-based monomer as an essential monomer unit, and a base oil, wherein the absolute value of difference in solubility parameter between the (co)polymer (A) and the base oil is 0.8 to 2.0 (cal/cm3)1/2.

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Patent Owner(s)

Patent OwnerAddress
SANYO CHEMICAL INDUSTRIES LTD11-1 IKKYO NOMOTOCHO HIGASHIYAMA-KU KYOTO-SHI KYOTO 605-0995

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nakada, Shigekuni Kyoto, JP 10 60
Sakaguchi, Ayumu Kyoto, JP 3 22
Tatsumi, Takenori Kyoto, JP 1 7
Yamashita, Hiroki Kyoto, JP 144 1350

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