Patent ID: 8859471
Filing Date: 2014-10-14
Classification: C10M,C10N

Abstract:
1. A lubricating composition comprising: (a) about 5 wt % to about 10 wt % of an ester-containing viscosity index improver wherein the ester-containing viscosity index improver comprises an esterified maleic anhydride-styrene copolymer, each ester group of the ester-containing viscosity index improver contains about 8 to about 14 carbon atoms, and the copolymer has a reduced specific viscosity of about 0.06 to about 0.8; (b) about 90 wt % to about 98.29 wt % of a polyoxyalkylene polyol, wherein the polyoxyalkylene polyol comprises (i) a portion of oxyalkylene groups derived from ethylene oxide; and (ii) a portion of oxyalkylene groups derived from an alkylene oxide containing about 3 to about 8 carbon atoms, and the polyoxyalkylene polyol has a weight average molecular weight of about 1000 to about 5000; (c) about 0.1 wt % to about 5 wt % of a phosphorus-containing acid, salt or ester; (d) about 0.1 wt % to about 5 wt % of a non-phosphorus extreme pressure agent; and (e) about 0.01 wt % to about 5 wt % of at least one other performance additive, wherein the lubricating composition is a multi-grade fluid.