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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 11718810 B1

PDFFull Text
Date of Patent:
Aug. 08, 2023

Filed:

Apr. 10, 2020

Lubricating oil composition and method for defoaming lubricating oil, and defoaming agent composition

Applicant:

Eneos Corporation, Tokyo, JP;

Inventors:

Akira Takagi, Tokyo, JP;

Go Tatsumi, Tokyo, JP;

Noriko Ayame, Tokyo, JP;

Assignee:

ENEOS CORPORATION, Tokyo, JP;

Attorney:

Greenblum & Bernstein, P.L.C.

Primary Examiner:

Ellen M McAvoy

Int. Cl.
CPC ...
C10M 155/02 (2006.01); B01D 19/04 (2006.01); C10M 101/02 (2006.01); C10M 105/32 (2006.01); C10M 111/02 (2006.01); C10M 169/04 (2006.01); C10M 177/00 (2006.01); C10N 70/00 (2006.01); C10N 40/04 (2006.01); C10N 20/04 (2006.01); C10N 30/02 (2006.01); C10N 30/18 (2006.01); C10N 40/25 (2006.01);
U.S. Cl.
CPC ...
C10M 155/02 (2013.01); B01D 19/0409 (2013.01); B01D 19/0427 (2013.01); C10M 101/02 (2013.01); C10M 105/32 (2013.01); C10M 111/02 (2013.01); C10M 169/041 (2013.01); C10M 177/00 (2013.01); C10M 2203/1006 (2013.01); C10M 2207/2805 (2013.01); C10M 2229/041 (2013.01); C10M 2229/051 (2013.01); C10N 2020/04 (2013.01); C10N 2030/02 (2013.01); C10N 2030/18 (2013.01); C10N 2040/042 (2020.05); C10N 2040/25 (2013.01); C10N 2070/02 (2020.05);
Abstract

A lubricating oil composition including: a lubricating base oil; (A) a first defoaming agent, the first defoaming agent being (A1) a first polymer, or (A2) a second polymer, or any combination thereof; and (B) a second defoaming agent, the second defoaming agent being a silicone defoaming agent, the (A1) first polymer including: a first polymer chain including a polysiloxane structure, the polysiloxane structure having a polymerization degree of 5 to 2000 and being represented by the following general formula (1); and a second polymer chain bonded with the first polymer chain, the second polymer chain including a repeating unit represented by the following general formula (2), the (A2) second polymer being a copolymer of a first monomer component and a second monomer component, the first monomer component represented by the general formula (7) or (8), the second monomer component represented by the general formula (9).

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