| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel oil composition providing improved viscosity and particularly viscosity at low temperature and shearing stability. SOLUTION: A lubricant composition comprising a first polymer that is an amorphous or semicrystalline ethyleneα-olefin copolymer and a second polymer that is a star-shaped polymer whose arm is derived from a diene and if necessary from a vinyl aromatic hydrocarbon monomer and a concentrated substance of a viscosity index (VI) improving agent in which the star-shaped polymer has a shearing stability index (SSI) of approximately 1 to approximately 35% (30 cycles) are provided. COPYRIGHT: (C)2008,JPO&INPIT |
