| abstract |
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: n n nwhere R 1 is a hydrocarbon group containing an aromatic ring, R 2 is a divalent hydrocarbon group, and R 3 is a hydrocarbon group containing an aliphatic ring; n n5≦ W 1 +W 2 +W 3 ≦30 (4) n n0.3≦( W 1 +0.5× W 2 )/( W 1 +W 2 +W 3 )≦0.7 (5) n nwhere W 1 , W 2 , and W 3 are respective contents (mass %) of the diurea compounds represented by general formulas (1) to (3) based on the total amount of the grease composition. |