| abstract |
PURPOSE:To provide a lubricating oil having excellent compatibility which comprises a synthetic hydrocarbon lubricating oil, a load-resistant additive, and a particular liquid modified ethylene/alpha-olefin random copolymer. CONSTITUTION:100pts.wt. liq. ethylene/3-20C alpha-olefin random copolymer having an ethylene content of 30-75mol.%, an intrinsic viscosity of 0.01-0.3dl/g, a number-average MW of 300-5,000, and an MW distribution of 1.1-4 is graft- modified with 0.2-50pts.wt. 3-10C unsatd. carboxylic acid (derivative) (e.g., acrylic acid) to prepare a liq. modified ethylene/alpha-olefin random copolymer (C) having a number-average MW of 310-5,000, an intrinsic viscosity of 0.01-0.3dl/g, and an MW distribution of 1.2-3. 100pts.wt. synthetic hydrocarbon lubricating oil (A) (e.g., polydecene-1) is blended with 0.1-20pts.wt. load-resistant additive (e.g., dibutyl phosphate) and 0.8-200pts.wt. component C in a C to B weight ratio of 0.05-200. |