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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.:

US 10982167 B1

PDFFull Text
Date of Patent:
Apr. 20, 2021

Filed:

Sep. 20, 2017

Viscosity index improver and lubricating oil composition

Applicant:

Nippon Shokubai Co., Ltd., Osaka, JP;

Inventors:

Yohei Imaizumi, Osaka, JP;

Keiko Izumi, Osaka, JP;

Kazunari Yasumura, Osaka, JP;

Daisuke Matsui, Osaka, JP;

Assignee:

NIPPON SHOKUBAI CO., LTD., Osaka, JP;

Attorney:

Wenderoth, Lind & Ponack, L.L.P.

Primary Examiner:

Prem C Singh

Assistant Examiner:

Francis C Campanell

Int. Cl.
CPC ...
C10L 1/22 (2006.01); C10M 149/10 (2006.01); C08F 220/18 (2006.01); C10M 169/04 (2006.01); C10M 149/06 (2006.01); C08F 290/04 (2006.01); C10N 20/02 (2006.01); C10N 20/04 (2006.01); C10N 30/02 (2006.01); C10N 30/00 (2006.01); C10N 40/08 (2006.01); C10N 40/25 (2006.01);
U.S. Cl.
CPC ...
C10M 149/10 (2013.01); C08F 220/18 (2013.01); C08F 290/04 (2013.01); C08F 290/048 (2013.01); C10M 149/06 (2013.01); C10M 169/041 (2013.01); C08F 220/1804 (2020.02); C08F 2800/20 (2013.01); C10M 2203/003 (2013.01); C10M 2203/1025 (2013.01); C10M 2209/084 (2013.01); C10M 2217/024 (2013.01); C10M 2217/028 (2013.01); C10N 2020/02 (2013.01); C10N 2020/04 (2013.01); C10N 2030/02 (2013.01); C10N 2030/68 (2020.05); C10N 2040/08 (2013.01); C10N 2040/25 (2013.01);
Abstract

A viscosity index improver comprising a copolymer having a unit (a) derived from a maleimide monomer and a unit (b) derived from a macromonomer, wherein viscosity measured by the following method is 8000 mPa·s or less. Viscosity measurement method: A solution composed of 78 mass % of a Group III base oil (viscosity index: 122, kinematic viscosity at 40° C.: 19.6 mm/s) on the American Petroleum Institute (API) classification and 22 mass % of the copolymer is measured with a viscometer (TVB-10 manufactured by Toki Sangyo Co., Ltd., rotor: SPINDLE No. M3, rotation speed: 6 rpm) at 25° C.

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