Composition of matter useful as a multifunctional viscosity index improver for lubricating oils comprising reaction product of:
(i) (a) copolymer of ethylene and at least one other alpha-olefin monomer, said copolymer comprising intramolecularly heterogeneous copolymer chains containing at least one crystallizable segment of methylene units and at least one low crystallinity ethylene-alpha-olefin copolymer segment, wherein said at least one crystallizable segment comprises at least about 10 weight percent of said copolymer chain and contains at least about 57 weight percent of said copolymer chain and contains at least about 57 weight percent ethylene, wherein said low crystalliity segment contains not greater than about 53 weight percent ethylene, and wherein said copolymer has a molecular weight distribution characterized by at least one of a ratio of M W/ Mn of less than 2 and a ratio of M z/ M of less than 1.8 and wherein at least two portions of an individual intramolecularly heterogeneous chain, each portion comprisig at least 5 weight percent of said chain, differ incomposition form one antoher by at least 7 weight percent ethylene, said copolymer grafted with (b) ethylenically monounsaturated carboxylic acid material having 1 to 2 carboxylic acid groups or anhydride group to form grafted ethylene copolymer; and
(ii) at least one polyamine containing one primary amino group and from 1 to about 6 secondary amino groups.
可用作润滑油多功能粘度指数改进剂的物质组合物,包括下列物质的反应产物
(i) (a)
乙烯和至少另一种α-烯烃单体的共聚物,所述共聚物包括分子内异构共聚物链,其中至少含有一个亚甲基单元的可结晶段和至少一个低结晶度的
乙烯-α-烯烃共聚物段、其中所述至少一个可结晶段包含至少约 10 重量百分比的所述共聚物链,并且包含至少约 57 重量百分比的所述共聚物链,并且包含至少约 57 重量百分比的
乙烯,其中所述低结晶度段包含不大于约 53 重量百分比的
乙烯,并且所述共聚物具有分子量分布,其特征在于 M W/ Mn 之比小于 2 和 M z/ M 之比小于 1 中的至少一个。(b) 具有 1 至 2 个
羧酸基团或酸酐基团的
乙烯基单不饱和
羧酸材料,以形成接枝
乙烯共聚物;和 (i) 至少一种
多胺,其特征为 M W/ Mn 的比率小于 2 和 M z/ M 的比率小于 1。
(ii) 至少一种含有一个伯
氨基和 1 至 6 个仲
氨基的
多胺。