Composition of matter useful as a multifunctional viscosity index improver for lubricating oil 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 ethylene, wherein said low crystallinity 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 Mw/Mn of less than 2 and a ratio of Mz/Mw of less than 1.8, and wherein at least two portions of an individual intramolecularly heterogeneous chain, each portion comprising at least 5 weight percent of said chain, differ in composition from one another 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) amido-amine or thioamido-amine comprising reaction product of (a) polyamine, and (b) alpha, beta-unsaturated compound represented by the formula
wherein X is oxygen or sulfur, Y is OR4 , -SR4, or
and R1, R2, R3. R4 and R5 are independently selected from hydrogen, hydrocarbyl. and substituted hydrocarbyl.
可用作润滑油多功能粘度指数改进剂的物质组合物,由以下物质的反应产物组成:
(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占所述共聚物链的至少约 10 重量%,并含有至少约 57 重量%的
乙烯,其中所述低结晶度段含有不大于约 53 重量%的
乙烯,并且所述共聚物具有分子量分布,其特征为 Mw/Mn 之比小于 2 和 Mz/Mw 之比小于 1 中的至少一种。(b) 具有 1 至 2 个
羧酸基团或酸酐基团的
乙烯基单不饱和
羧酸材料接枝,形成接枝
乙烯共聚物:和
(ii)
氨基胺或
硫代
氨基胺,包括(a)
多胺和(b)α、β-不饱和化合物的 反应产物,其式为
其中 X 是氧或
硫,Y 是 OR4 、-SR4 或
以及 R1、R2、R3.R4 和 R5 独立选自氢、烃基和取代的烃基。