| abstract |
Lubricating grease compsns. comprise a base oil and 15-35wt.% of a bis-urea of formula R1-NHCONH-R2-NHCONH-R3 (I), where R2=a 6-15C aromatic hydrocarbon gp. and R1 and R3=6-12C aromatic or 8-20C aliphatic hydrocarbon gps., provided that 50-100 mole% of all R1 and R3 gps. are aromatic. The base oil comprises at least 10 wt.% of an ester oil and has a kinematic viscosity of 5-200 mm<2>/sec. at 40 deg C. |