# US 5,707,944 A · Grease composition

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- Number: US 5,707,944 A
- Document ID: US5707944A
- Status: Granted
- Kind: A
- Application number: 08/544,206
- Filed: 1995-10-17
- Granted: 1998-01-13
- Earliest claimed: 1994-10-17
- Assignees: Nsk Ltd.; Kyodo Yushi Co., Ltd.
- Inventors: Atsushi Yokouchi; Hideki Koizumi; Kenichi Iso; Michiharu Naka; Toshiaki Endo; Yoichi Suzuki
- Web page: https://patentgrep.com/patent/US5707944A

## CPC

- F16C 33/6633: {Grease properties or compositions, e.g. rheological properties}
- C10M 101/02: Petroleum fractions
- C10M 105/18: Ethers, e.g. epoxides
- C10M 105/32: Esters
- C10M 105/36: of polycarboxylic acids
- C10M 105/38: of polyhydroxy compounds
- C10M 107/00: Lubricating compositions characterised by the base-material being a macromolecular compound
- C10M 115/08: containing nitrogen
- C10M 169/02: Mixtures of base-materials and thickeners
- C10M 2203/10: Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M 2203/1006: used as base material
- C10M 2203/102: Aliphatic fractions
- C10M 2203/1025: used as base material
- C10M 2203/1045: used as base material
- C10M 2203/1065: used as base material
- C10M 2203/1085: used as base material
- C10M 2205/00: Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M 2205/003: used as base material
- C10M 2205/02: containing acyclic monomers
- C10M 2207/04: Ethers; Acetals; Ortho-esters; Ortho-carbonates
- C10M 2207/0406: used as base material
- C10M 2207/2805: used as base material
- C10M 2207/281: of (cyclo)aliphatic monocarboxylic acids
- C10M 2207/282: of (cyclo)aliphatic oolycarboxylic acids
- C10M 2207/2825: used as base material
- C10M 2207/283: of polyhydroxy compounds
- C10M 2207/2835: used as base material
- C10M 2207/284: of aromatic monocarboxylic acids
- C10M 2207/285: of aromatic polycarboxylic acids
- C10M 2207/2855: used as base material
- C10M 2207/286: of polymerised unsaturated acids
- C10M 2207/34: Esters having a hydrocarbon substituent of thirty or more carbon atoms, e.g. substituted succinic acid derivatives
- C10M 2207/345: used as base material
- C10M 2215/006: used as thickening agents
- C10M 2215/026: used as thickening agents
- C10M 2215/0813: used as thickening agents
- C10M 2215/1013: used as thickening agents
- C10M 2215/102: Ureas; Semicarbazides; Allophanates
- C10M 2215/1026: used as thickening material
- C10M 2215/121: used as thickening agents
- C10M 2215/2206: used as thickening agents
- C10M 2215/2275: used as thickening agents
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- 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)

## Abstract

A grease composition comprising a base oil containing not less than 10% by weight of an ester oil based on the total base oil and having a kinematic viscosity of 50 to 200 mm.sup.2 /sec at 40.degree. C. and 15 to 35% by weight, based on the total grease composition, of a diurea compound represented by formula (I): ##STR1## wherein R.sub.2 represents an aromatic hydrocarbon group having 6 to 15 carbon atoms; and R.sub.1 and R.sub.3, which may be the same or different, each represent an aromatic hydrocarbon group having 6 to 12 carbon atoms or an aliphatic hydrocarbon group having 8 to 20 carbon atoms, the proportion of the aromatic hydrocarbon groups in the total of R.sub.1 and R.sub.3 being 50 to 100 mol %. When applied to outer race rotating bearings, the grease composition is excellent in flaking resistance, leak resistance, and low noise properties and prevents premature seizing under high temperature and high speed conditions.

## Claims

### Claim 1

A grease composition comprising a base oil containing not less than 10% by weight of an ester oil based on the total base oil and having a kinematic viscosity of 50 to 200 mm.sup.2 /sec at 40.degree. C. and 15 to 35% by weight, based on the total grease composition, of a diurea compound represented by formula (I): ##STR5## wherein R.sub.2 represents an aromatic hydrocarbon group having 6 to 15 carbon atoms; and R.sub.1 and R.sub.3, which may be the same or different, each represent an aromatic hydrocarbon group having 6 to 12 carbon atoms or an aliphatic hydrocarbon group having 8 to 20 carbon atoms, the proportion of the aromatic hydrocarbon groups in the total of R.sub.1 and R.sub.3 being 50 to 100 mol %.

### Claim 2 (depends on 1)

The grease composition of claim 1, wherein said ester oil is a hindered ester oil, an aromatic ester oil, or a mixture thereof.

### Claim 3 (depends on 1)

The grease composition of claim 1, wherein said ester oil contains at least one of pentaerythritol ester oils, dipentaerythritol ester oils, tripentaerythritol ester oils, trimethylolpropane ester oils, trimellitate ester oils, and pyromellitate ester oils in an amount of 50 to 100% by weight based on the total ester oil.

### Claim 4 (depends on 1)

The grease composition of claim 1, wherein said ester oil contains at least one neopentyl diol ester oil.

### Claim 5 (depends on 1)

The grease composition of claim 1, wherein said ester oil contains at least one complex ester oil which is an ester of a polyhydric alcohol and a mixture of a monobasic acid and a dibasic acid.

### Claim 6 (depends on 1)

The grease composition of claim 1, wherein said base oil has a kinematic viscosity of 70 to 180 mm.sup.2 /sec at 40.degree. C.

### Claim 7 (depends on 1)

The grease composition of claim 1, wherein said base oil contains 0% by weight of a phenyl ether oil.