Grease composition
AssigneeNippon Mitsubishi Oil Corporation
InventorsHirotugu Kinoshita, Kiyomi Sakamoto
Life of this patent
Estimating the term…
Abstract
A grease composition is disclosed which contains a lubricating base oil, and: (A) 2 to 30 wt % of a urea thickener, (B) 0.1 to 20 wt % of a sulfur-containing extreme pressure agent selected from the group consisting of dihydrocarbyl polysulfide, sulfurized oils and fats and mixtures thereof, and (C) 0.05 to 10 wt % of a sulfonate selected from the group consisting of an over-based zinc sulfonate, an over-based magnesium sulfonate and mixtures thereof having total base number of 100 to 500 mgKOH/g, each based on a total amount of said composition.
Claims14
A grease composition comprising a lubricating base oil, and:
- (A) 2 to 30 wt % of a thickener selected from the group consisting of a urea compound, a urea-urethane compound, a urethane compound and mixture thereof,
- (B) 0.1 to 20 wt % of a sulfur-containing extreme pressure agent selected from the group consisting of dihydrocarbyl polysulfide, sulfurized oils and fats and mixtures thereof, and
- (C) 0.05 to 10 wt % of a sulfonate selected from the group consisting of an over-based zinc sulfonate, an over-based magnesium sulfonate and mixtures thereof, having total base number of 100 to 500 mgKOH/g,
- each based on a total amount of said grease composition.
The grease composition of claim 11 wherein said over-based oil-soluble zinc sulfonate is selected from the group consisting of an over-based oil-soluble zinc sulfonate containing calcium carbonate and an over-based oil-soluble zinc sulfonate containing calcium borate, and wherein said over-based oil-soluble magnesium sulfonate is selected from the group consisting of an over-based oil-soluble magnesium sulfonate containing magnesium carbonate and an over-based oil-soluble magnesium sulfonate containing magnesium borate.
Dependencies are inferred from the claim text.