| 摘要 |
PROBLEM TO BE SOLVED: To provide a graft copolymer suitable as a dispersive viscosity index improver in a lubricant oil composition for an EGR engine. SOLUTION: The graft copolymer especially useful as the dispersive viscosity index improver in the lubricant oil composition has a polymer skeleton selected from the group consisting of an olefinic polymer, dienepolymer, vinyl polymer and vinylidene polymer and is grafted with an amine selected from a reaction product or the like of N-p-diphenylamine, 1, 2, 3, 6-tetrahydrophtalimide, 4-anilinophenylmethacrylamide, 4-anilinophenylmaleimide, 4-aninophenylitaconamide, acrylate or methacrylate of 4-hydroxydiphenylamine, p-aminodiphenylamine or p-alkylaminodiphenylamine with glycidyl methacrylate and a mixture thereof, and the graft copolymer is manufactured using a graft condition in solution or bulk in a single step. COPYRIGHT: (C)2005,JPO&NCIPI |
