CPC C10M 145/14 (2013.01) [C10M 143/10 (2013.01); C10M 169/044 (2013.01); C10M 2205/04 (2013.01); C10M 2209/084 (2013.01); C10M 2209/086 (2013.01); C10M 2223/045 (2013.01); C10N 2010/04 (2013.01); C10N 2020/02 (2013.01); C10N 2020/04 (2013.01); C10N 2030/02 (2013.01); C10N 2030/04 (2013.01); C10N 2030/08 (2013.01); C10N 2030/10 (2013.01); C10N 2030/12 (2013.01); C10N 2030/18 (2013.01); C10N 2030/45 (2020.05); C10N 2030/52 (2020.05); C10N 2040/252 (2020.05); C10N 2040/255 (2020.05)] | 15 Claims |
1. A low-temperature stable lubricating composition exhibiting pumpability comprising:
a base oil of lubricating viscosity;
about 0.5 to about 1.0 weight percent of a polymeric additive including a blend of an esterified styrene-maleic anhydride copolymer and a poly(meth)acrylate copolymer effective to maintain a pumpable fluid, wherein the polymeric additive includes about 40 weight percent to about 60 weight percent of the esterified styrene-maleic anhydride copolymer based on the total weight of the esterified styrene-maleic anhydride copolymer and the poly(meth)acrylate copolymer; and wherein the lubricating composition with the polymeric additive maintains a pumpable fluid at temperature down to −40° C. as evidenced by passing MRV performance pursuant to ASTM D4684 with a viscosity less than 60,000 cP and a yield stress less than 35.
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