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US 2022/0169944 A1Published application
Engine oils with low temperature pumpability
AssigneeAfton Chemical Corporation
InventorsKongsheng YANG, Youhong WANG, Sheng JIANG
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Abstract
A lubricating composition including a polymer blend of a modified styrene-maleic anhydride copolymer and poly(meth)acrylate copolymer effective to maintain a pumpable fluid at low temperatures.
Claims20
A low-temperature stable lubricating composition exhibiting pumpability comprising:
- a base oil of lubricating viscosity;
- a polymeric additive including a blend of a modified styrene-maleic anhydride copolymer and a poly(meth)acrylate copolymer effective to maintain a pumpable fluid.
A method for maintaining a pumpable viscosity of a lubricating composition, the method comprising adding to a lubricating composition a polymeric additive effective to maintain a pumpable fluid as evidenced by a passing MRV performance pursuant to ASTM D4684 at temperatures down to about −40° C.;
- wherein the polymeric additive includes a blend of a modified styrene-maleic anhydride copolymer and a poly(meth)acrylate copolymer.
(canceled)
Dependencies are inferred from the claim text.