GRAFT COPOLYMERS, METHOD OF MAKING AND COMPOSITIONS CONTAINING THE SAME

摘要

Graft copolymers, particularly useful as dispersant viscosity index improver s in lubricating oil compositions have a polymer backbone selected from is select ed from the group consisting of olefin polymers, diene polymers, vinyl polymers and vinylidene polymers, is grafted with an amine selected from N-p-diphenylamine,1,2,3,6- tetrahydrophthalimide; 4-anilinophenyl methacrylamide; 4-anilinophenyl maleimide; 4- anilinophenyl itaconamide; acrylate and methacrylate esters of 4- hydroxydiphenylamine; the reaction product of p-aminodiphenylamine or p- alkylaminodiphenylamine with glycidyl methacrylate; the reaction product of p- aminodiphenylamine with isobutyraldehyde, derivatives of p- hydroxydiphenylamine; derivatives of phenothiazine; vinylogous derivatives of diphenylamine; and mixtures thereof and may be prepared in a single step process using solution or bulk grafting conditions.