| 摘要 |
PURPOSE:To obtain the subject composition having improved pumping efficiency and select time lag, and performances not affected by temperatures, containing a synthetic oil prepared by mixing alpha-olefin oligomer and ethylene-alpha-olefin oligomer in specific ratio. CONSTITUTION:The aimed composition containing a synthetic oil consisting of (A) 69-59wt.% 14-26C alpha-olefin oligomer and (B) 10-25wt.% ethylene-alpha- olefin co-oligomer having 3000-4000 number-average molecular weight and a part of the component A is substituted by ethylene-alpha-olefin copolymer having 26000-40000 number-average molecular weight, as necessary. |
