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|1. (WO2018203542) GREASE COMPOSITION|
|Applicants:||IDEMITSU KOSAN CO.,LTD.
A grease composition comprising a base oil (A) including an ester oil (A1), and an aliphatic diurea (B) represented by general formula (b1), R1–NHCONH–R3–NHCONH–R2 (b1) (where R1 and R2 each independently represent a C8-20 monovalent aliphatic hydrocarbon group, and R3 represents a C6 to 18 bivalent aromatic hydrocarbon group) wherein, in said grease composition, the kinematic viscosity at 40°C of the base oil (A) is 10 mm2/s to no more than 45 mm2/s, the ester oil (A1) content is 50 mass% or more relative to the total weight of the base oil (A), the aliphatic diurea (B) content is 20 to 30 mass% relative to the total weight of the grease composition, and the worked penetration at 25°C is greater than 300.