LUBRICATING OIL ADDITIVE CONTAINING ACRYLIC POLYMER AND LUBRICATING OIL COMPOSITIONS
申请人:KURARAY CO., LTD.
公开号:EP1795581A1
公开(公告)日:2007-06-13
A lubricating oil additive containing at least one acrylic block copolymer having a weight-average molecular weight of 10,000 to 1,000,000 and a molecular weight distribution [ratio of weight-average molecular weight (Mw) to number-average molecular weight (Mn), i.e. Mw/Mn ratio] of 1.5 or below and lubricating oil compositions containing the additive. The lubricating oil additive exhibits a thickening effect higher than those of conventional acrylic lubricating oil additives and can improve the viscosity index of lubricating oil even when added in a small amount. Further, the additive can also improve the low-temperature characteristics, flow characteristics, and shear stability. The lubricating oil compositions enable energy saving and can lengthen the lifetime of lubricating oil and reduce the load on the global environment.
一种润滑油添加剂,至少含有一种重量平均分子量为 10,000 至 1,000,000 且分子量分布[重量平均分子量(Mw)与数均分子量(Mn)之比,即 Mw/Mn 比]为 1.5 或以下的丙烯酸嵌段共聚物,以及含有该添加剂的润滑油组合物。该润滑油添加剂的增稠效果高于传统的丙烯酸润滑油添加剂,即使添加量很小,也能提高润滑油的粘度指数。此外,添加剂还能改善低温特性、流动特性和剪切稳定性。这种润滑油组合物可以节约能源,延长润滑油的使用寿命,减轻对全球环境的负荷。