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US 12,378,498 B2Granted
Grease composition
AssigneeIdemitsu Kosan Co., Ltd.
InventorsKeisuke Inda, Go Watanabe, Kouji Takane
Life of this patent
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Abstract
A grease composition, containing a base oil (A), a urea-based thickener (B), and a polymer compound (C). The particles that make up the urea-based thickener (B) in the grease composition satisfy the following requirement (I): the particles have an arithmetic average particle diameter on an area basis as measured by a laser diffraction/scattering method of 2.0 μm or less, and the polymer compound (C) has a number average molecular weight (Mn) of 30,000 or more and a molecular weight distribution (Mw/Mn) of 2.20 or less.
Claims20
A grease composition, comprising:
- a base oil;
- a urea-based thickener comprising a diurea compound;
- and
- a polymer compound comprising an ethylene-propylene copolymer or an ethylene-butylene copolymer,
- wherein the diurea compound of the urea-based thickener has formula, R1-NHCONH-R3-NHCONH-R2, where R1 and R2 are each independently a hydrocarbon group having 6 to 18 carbon atoms, R3 is a diphenylmethylene group, and the urea-based thickener is in an amount in a range of 4.0% by mass to 7.0% by mass based on a total amount of the grease composition, particles that comprise the urea-based thickener have an arithmetic average particle diameter on an area basis as measured by a laser diffraction/scattering method of 2.0 μm or less, and the polymer compound has a number average molecular weight of 30,000 or more and a molecular weight distribution of 2.20 or less and is in an amount in a range of 1.0% by mass to 2.3% by mass based on the total amount of the grease composition.
2 more elements
A grease composition, comprising:
- a base oil;
- a urea-based thickener;
- and
- a polymer compound,
- wherein particles that comprise the urea-based thickener have an arithmetic average particle diameter on an area basis as measured by a laser diffraction/scattering method of 2.0 μm or less, the polymer compound has a number average molecular weight of 30,000 or more and a molecular weight distribution of 2.20 or less, and the urea-based thickener is present in an amount in a range of 1.0% by mass to 6.5% by mass based on a total amount of the grease composition.
2 more elements
Dependencies are inferred from the claim text.