| 摘要 |
PURPOSE:To obtain a lubricating oil composition excellent in shear stability, viscosity index and low-temperature viscosity characteristics. CONSTITUTION:The polymer composition comprises (A) an oil-soluble graft copolymer composed of an alpha-olefin copolymer and an unsaturated monocarboxylic alkyl ester and (B) an oligomer as a trimer to heptamer of the unsaturated monocarboxylic alkyl ester. The objective lubricating oil composition contains this polymer composition. |
