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US 12,344,810 B2Granted
Grease composition and production method of grease composition
AssigneeJtekt Corporation
InventorsKanako Takahara Niiya, Junya Matsuyama
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Abstract
A grease composition includes a base oil and a thickener. The thickener contains a urea compound and a styrene-based polymer. A content of the styrene-based polymer is 2% by mass or more and 30% by mass or less as to a total amount of the urea compound and the styrene-based polymer. In the thickener, an average value of diameter of particles with a diameter of 0.2 μm or more is 0.2 μm or more and 1.0 μm or less.
Claims1
A method of producing a grease composition, comprising:
- providing
- a styrene-based polymer,
- an amine compound,
- an isocyanate compound,
- a lubricating oil,
- a first solvent that does not dissolve a urea compound that is generated, and
- a second solvent that does not dissolve the urea compound that is generated;
- wherein
- a content of the styrene-based polymer is 2% by mass or more and 30% by mass or less relative to a total amount of the urea compound and the styrene-based polymer;
- dissolving or dispersing the amine compound in the first solvent, dissolving or dispersing the isocyanate compound in the second solvent, dissolving or dispersing the styrene-based polymer in one or both of the first solvent and the second solvent, such that a first blended solution containing at least the amine compound and a second blended solution containing at least the isocyanate compound are prepared;
- blending the first blended solution and the second blended solution, and carrying out reaction of the amine compound and the isocyanate compound, such that a third blended solution containing the styrene-based polymer and the urea compound is generated;
- and
- adding the lubricating oil after removing the first solvent and the second solvent from the third blended solution.
10 more elements
Dependencies are inferred from the claim text.