# US 11,441,091 B2 · Grease base oil and grease composition containing said grease base oil

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- Number: US 11,441,091 B2
- Document ID: US11441091B2
- Status: Granted
- Kind: B2
- Application number: 17/312,666
- Filed: 2020-01-30
- Published: 2022-03-03
- Granted: 2022-09-13
- Earliest claimed: 2019-02-12
- Assignees: Kyodo Yushi Co., Ltd.; Kao Corporation
- Applicants: Kao Corporation; Kyodo Yushi Co., Ltd.
- Inventors: Tatsuya Miyazaki; Yuta Kanazawa; Tomonobu Komoriya; Hiroyuki Ishikawa; Yuta Sato
- Web page: https://patentgrep.com/patent/US11441091B2

## CPC

- C10M 105/34: of monocarboxylic acids
- C10M 105/38: of polyhydroxy compounds
- C10M 169/02: Mixtures of base-materials and thickeners
- C10M 2207/2805: used as base material
- C10M 2207/2815: used as base material
- C10M 2207/283: of polyhydroxy compounds
- C10M 2207/2835: used as base material
- C10M 2207/2845: used as base material
- C10N 2020/02: Viscosity; Viscosity index
- C10N 2020/071: {Branched chain compounds}
- C10N 2030/02: Pour-point; Viscosity index
- C10N 2030/06: Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
- C10N 2030/08: Resistance to extreme temperature
- C10N 2040/02: Bearings
- C10N 2050/10: semi-solid; greasy
- C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33)
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS

## Abstract

A grease base oil, containing: condensation esters of alcohols (A) and carboxylic acids (B), wherein the alcohols (A) include a polyhydric alcohol represented by General Formula (1), the carboxylic acids (B) include a fatty acid having 5 to 9 carbon atoms (B-1), a branched fatty acid having 15 to 20 carbon atoms (B-2), a cycloalkane monocarboxylic acid having 4 to 8 carbon atoms (B-3), and an aromatic carboxylic acid (B-4), and the carboxylic acids (B) have a percentage of (B-1) above of 30 mol % to 50 mol %, a percentage of (B-2) above of 30 mol % to 50 mol %, a percentage of (B-3) above of 10 mol % to 30 mol %, and a percentage of (B-4) above of 1 mol % to 15 mol %. The grease base oil contains condensation esters having heat resistance and low temperature storageability.

## Claims

### Claim 1

A grease base oil, containing:
condensation esters of alcohols (A) and carboxylic acids (B),
wherein the alcohols (A) include a polyhydric alcohol represented by General Formula (1):
wherein R1 to R4 independently represent a hydrogen atom, a methyl group, or a hydroxyl group, and at least two of R1 to R4 represent a hydroxyl group,
the carboxylic acids (B) include a fatty acid having 5 or more and 9 or less carbon atoms (B-1), a branched fatty acid having 15 or more and 20 or less carbon atoms (B-2), a cycloalkane monocarboxylic acid having 4 or more and 8 or less carbon atoms (B-3), and an aromatic carboxylic acid (B-4), and
the carboxylic acids (B) have a percentage of the fatty acid (B-1) of 30 mol % or more and 50 mol % or less, a percentage of the branched fatty acid (B-2) of 30 mol % or more and 50 mol % or less, a percentage of the cycloalkane monocarboxylic acid (B-3) of 10 mol % or more and 30 mol % or less, and a percentage of the aromatic carboxylic acid (B-4) of 1 mol % or more and 15 mol % or less.

### Claim 2 (depends on 1)

The grease base oil according to claim 1, wherein the condensation esters have a kinematic viscosity at 40° C. of 80 mm2/sec or more and 110 mm2/sec or less, and a kinematic viscosity at 100° C. of 11 mm2/sec or more and 14 mm2/sec or less.

### Claim 3 (depends on 1)

The grease base oil according to claim 1, having a molar ratio of the cycloalkane monocarboxylic acid (B-3) to the aromatic carboxylic acid (B-4) ((B-3)/(B-4)) of 0.5 or more and 20 or less.

### Claim 4 (depends on 1)

The grease base oil according to claim 1, wherein the alcohols (A) are pentaerythritol, the fatty acid having 5 or more and 9 or less carbon atoms (B-1) is n-heptanoic acid, the branched fatty acid having 15 or more and 20 or less carbon atoms (B-2) is isostearic acid, the cycloalkane monocarboxylic acid having 4 or more and 8 or less carbon atoms (B-3) is cyclohexanecarboxylic acid, and the aromatic carboxylic acid (B-4) is benzoic acid.

### Claim 5 (depends on 1)

The grease base oil according to claim 1, having a percentage of the condensation esters of 50% by mass or more and 100% by mass or less.

### Claim 6 (depends on 1)

A grease composition, containing:
the grease base oil according to claim 1.