| abstract |
[Problem] To provide a friction modifier excellent in friction reduction effect. A friction modifier comprising a (co) polymer having Formula 1 and Formula 2 as essential constituent monomers. (A 1 is a monovalent, A 2 is a divalent radical polymerizable group; -X 1 -, - X 2 - and -X 3 - groups of independently -O- or -NH-; R 1 is C1~ 4 alkylene; R 2 is independently C2-20 alkylene; R 3 is H, C1-44 alkyl, C2-45 acyl, and the like; p to r are each independently an integer of 1 to 100) [Selection figure] None |