| 摘要 |
PURPOSE:To obtain the titled composition with the viscosity independent of temperature, good in gas sealability at compressor sliding sections and lubricity, by incorporating, as the viscosity index enhancer, specific amounts of an alpha-olefin oligomer in a naphthene mineral oil and alkylbenzene synthetic oil. CONSTITUTION:The objective composition can be obtained by incorporating (A) a naphthene mineral oil and alkylbenzene synthetic oil with (B) as the viscosity index enhancer, 30-50vol.% of a heat-resistant alpha-olefin oligomer highly compatible with the base oil, with an average mol.wt. of 650-750. |
