| 摘要 |
A grease composition containing a lubricant base oil, diurea compounds represented by the following general formulas (1) to (3), and at least one species selected from the group consisting of paraffin oxides and phosphorus compounds; wherein respective contents of the diurea compounds represented by the following general formulas (1) to (3) satisfy conditions defined by the following expressions (4) and (5); and wherein the total content of the paraffin oxides and phosphorus compounds is 0.1 to 15 mass % based on the total amount of the grease composition: where R<SUP>1 </SUP>is a hydrocarbon group containing an aromatic ring, R<SUP>2 </SUP>is a divalent hydrocarbon group, and R<SUP>3 </SUP>is a hydrocarbon group containing an aliphatic ring; <?in-line-formulae description="In-line Formulae" end="lead"?>5<=W<SUB>1</SUB>+W<SUB>2</SUB>+W<SUB>3</SUB><=30 (4) <?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>0.3<=(W<SUB>1</SUB>+0.5xW<SUB>2</SUB>)/(W<SUB>1</SUB>+W<SUB>2</SUB>+W<SUB>3</SUB>)<=0.7 (5) <?in-line-formulae description="In-line Formulae" end="tail"?> where W<SUB>1</SUB>, W<SUB>2</SUB>, and W<SUB>3 </SUB>are respective contents (mass %) of the diurea compounds represented by general formulas (1) to (3) based on the total amount of the grease composition.
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