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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 11905486 B1

PDFFull Text
Date of Patent:
Feb. 20, 2024

Filed:

Sep. 24, 2020

Viscosity index improver composition and lubricating oil composition

Applicant:

Idemitsu Kosan Co.,ltd., Chiyoda-ku, JP;

Inventors:

Yoriyuki Takashima, Ichihara, JP;

Taeko Nakano, Urayasu, JP;

Koki Hirano, Ichihara, JP;

Motoharu Ishikawa, Chiba, JP;

Assignee:

IDEMITSU KOSAN CO., LTD., Chiyoda-ku, JP;

Attorney:

Oblon, McClelland, Maier & Neustadt, L.L.P.

Primary Examiner:

Ellen M McAvoy

Int. Cl.
CPC ...
C10M 145/14 (2006.01); C08F 220/18 (2006.01); C08F 220/28 (2006.01); C08F 290/04 (2006.01); C10M 143/12 (2006.01); C10M 169/04 (2006.01); C10N 20/00 (2006.01); C10N 30/00 (2006.01); C10N 40/25 (2006.01); C10N 20/02 (2006.01); C10N 20/04 (2006.01);
U.S. Cl.
CPC ...
C10M 145/14 (2013.01); C08F 220/1804 (2020.02); C08F 220/1812 (2020.02); C08F 220/1818 (2020.02); C08F 220/281 (2020.02); C08F 290/048 (2013.01); C10M 143/12 (2013.01); C10M 169/041 (2013.01); C10M 2205/06 (2013.01); C10M 2209/084 (2013.01); C10N 2020/02 (2013.01); C10N 2020/04 (2013.01); C10N 2020/071 (2020.05); C10N 2030/54 (2020.05); C10N 2040/255 (2020.05);
Abstract

An object is to provide a viscosity index improver composition that is capable of properly regulating the HTHS viscosity in the effective temperature range of a lubricating oil composition to a lower range, and a lubricating oil composition containing the viscosity index improver composition, and the viscosity index improver composition contains a comb-shaped polymer (A) containing a structural unit derived from a macromonomer (α) and a structural unit derived from a particular monomer (A1), the macromonomer (α) having a (meth)acryloyl group at one end, and having a structural unit derived from a monomer (α1) selected from butadiene and hydrogenated butadiene.

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