| abstract |
A friction inhibiting compound of the present invention is a friction inhibiting compound including a copolymer (A) that includes a polymerizable monomer (a) and a polymerizable monomer (b) as constituent monomers, wherein the polymerizable monomer (a) includes a specific alkyl acrylate or alkyl methacrylate, the polymerizable monomer (b) is at least one selected from the group consisting of specific hydroxyalkyl acrylates and hydroxyalkyl methacrylates; specific alkyl acrylates and alkyl methacrylates; and aromatic vinyl monomers having 8 to 14 carbon atoms, and a composition ratio of the polymerizable monomer (a) and polymerizable monomer (b) in the copolymer (A), represented by (a):(b), is (10 to 45):(55 to 90) in a molar ratio (provided that a total molar ratio of (a) and (b) is 100), and the weight average molecular weight of the copolymer (A) is 1,000 to 500,000. |