申请人:——
公开号:US20040077509A1
公开(公告)日:2004-04-22
Viscosity index improvers, are disclosed, comprising oil-soluble copolymer (A) comprising units of 5-90% by weight of a monomer (a) represented by the general formula:
CH
2
═C(R
1
)—COO—(A—O)
n
—R (
1
)
wherein R
1
is H or CH
3
, A is a C
2-4
alkylene group, n is 0 or an integer of 1-20, and R is a branched C
18-36
alkyl group, free from any polymethylene group containing more than 16 carbon atoms; units of 5-90% by weight of at least one monomer (b) selected from the group consisting of C
8-17
alkyl (meth)acrylates and straight-chain C
18-24
alkyl (meth)acrylates, and units of 5-50% by weight of a monomer (c) having at least one group selected from hydroxyl, amide and carboxyl groups.
The viscosity index improvers are useful as additives for lube oils, such as gear oils, transmission fluids, traction oils, hydraulic oils and engine oils.
本发明公开了粘度指数改进剂,由油溶性共聚物(A)组成,该共聚物由 5-90%(按重量计)的单体(a)单元组成,单体(a)由通式表示:
CH
2
═C(R
1
)-COO-(A-O)
n
-R (
1
)
其中 R
1
是 H 或 CH
3
A 是 C
2-4
烯基,n 为 0 或 1-20 的整数,R 为支链 C
18-36
烷基,不含任何含 16 个以上碳原子的聚亚甲基; 5-90%(按重量计)的至少一种单体(b)单元,选自 C
8-17
烷基(甲基)丙烯酸酯和直链 C
18-24
(甲基)丙烯酸烷基酯和直链 C 18-24 烷基(甲基)丙烯酸酯组成的组中选出的单体(b)的重量单位为 5-50%,该单体(c)具有至少一个选自羟基、酰胺基和羧基的基团。
粘度指数改进剂可用作润滑油的添加剂,如齿轮油、传动液、牵引油、液压油和发动机油。