| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved lubricant oil, lubricant oil composition and additives therefor, and lubricated parts and engines, and also to provide a method for lubricating movable parts. SOLUTION: The lubricant oil composition comprises a lubricating viscous base oil and about 5-30 wt.% of an additive containing a shear stable olefin copolymer derived from a copolymer having a number average molecular weight of about 50,000-250,000. The shear stable olefin copolymer has about 40 or lower shear stability index, a multi-dispersibility of about 1.5 or lower, a concentration efficacy of about 1.8 or more, and it can improve a viscosity index of the composition. COPYRIGHT: (C)2006,JPO&NCIPI |
