The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 15, 2019
Filed:
Sep. 15, 2015
Applicant:
Nippon Shokubai Co., Ltd., Osaka, JP;
Inventors:
Assignee:
NIPPON SHOKUBAI CO., LTD., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C10L 1/22 (2006.01); C10M 145/14 (2006.01); C10M 149/10 (2006.01); C10M 149/06 (2006.01); C10M 177/00 (2006.01);
U.S. Cl.
CPC ...
C10M 149/10 (2013.01); C10M 149/06 (2013.01); C10M 177/00 (2013.01); C10M 2209/084 (2013.01); C10M 2217/028 (2013.01); C10N 2220/021 (2013.01); C10N 2220/022 (2013.01); C10N 2230/02 (2013.01); C10N 2230/68 (2013.01); C10N 2240/10 (2013.01); C10N 2270/00 (2013.01);
Abstract
A viscosity index improver comprising a polymer which has a high viscosity index and good shear stability and which exhibits sufficient solubility in a lubricating base oil, a process for producing the same, and a lubricating oil composition containing the viscosity index improver are provided, wherein the viscosity index improver comprising a polymer satisfying the following (1) to (4): (1) weight-average molecular weight (Mw) of 200,000 or more and 600,000 or less; (2) number-average molecular weight (Mn) of 90,000 or more; (3) molecular weight distribution (Mw/Mn) of 4.0 or less; and (4) branching degree of 1.0 or more.