UNIFORM ADDITIVE CONCENTRATE FOR PREPARATION OF LUBRICATING OIL COMPOSITION

摘要

PROBLEM TO BE SOLVED: To obtain a uniform additive concentrate, especially the one contg. a polymer ester viscosity improver and a hydrocarbyl group substd. ashless dispersant. SOLUTION: This additive concentrate is a uniform compsn. contg. following (A) and (B): (A) at least one kind of polymer ester viscosity improver contg. a nitrogen contg. group, if necessary, and (B) at least one kind of hydrocarbyl group substd. ashless dispersant, wherein the hydrocarbyl group has an Mn in the range of ca. 200-ca. 800, and wherein wt. ratio of (A)/(B) is in the range of ca. 3:1-ca. 1:3.