Patent ID: 7622433
Filing Date: 2009-11-24
Classification: C10M,C10N

Abstract:
1. A lubricating oil composition (BB) comprising 92 to 99.85% by weight of a lubricating oil base (A) having a kinematic viscosity at 100° C. of 1 to 50 mm 2 /s, 0.1 to 5% by weight of an ethylene•propylene copolymer (B), and 0.05 to 3% by weight of a pour-point depressant (C) having a melting point as measured with DSC of not higher than −15° C., wherein the lubricating oil base (A) has (A1) a viscosity index of not less than 80, (A2) a saturated hydrocarbon content of not less than 90% by volume, and (A3) a sulfur content of not more than 0.03% by weight and the ethylene•propylene copolymer (B) has (B1) an ethylene content of from 30 to 75% by weight, (B2) an intrinsic viscosity [η] of 1.3 to 2.0 dl/g, (B3) a Mw/Mn of not more than 2.4, and (B4) a melting point as measured with DSC of not higher than 30° C.