| abstract |
This invention contains the unit of the 1 or more types of monomer (a) represented by General formula (1), and the unit of the 1 or more types of monomer (b) represented by General formula (2),n n n CH 2 = C (R 1 ) -Q- (ZA 1 ) m -X (1)n n n CH 2 = C (R 3 ) -CO- (OA 2 ) n -OR 4 (2)n n n A friction modifier for lubricating oil consisting of an oil-soluble copolymer (A) having a weight average molecular weight of 3,000 or more; A friction modifier composition comprising the copolymer (A) and at least one member selected from the group consisting of diluents and other additives; Provided are a base oil and a lubricating oil composition comprising the friction regulator or the friction regulator composition. They are excellent in friction adjustment effect, can reduce shift shock, high friction coefficient required for power transmission, and excellent wear resistance. |