US 11,680,222 B2
Engine oils with low temperature pumpability
Kongsheng Yang, Glen Allen, VA (US); Youhong Wang, Glen Allen, VA (US); and Sheng Jiang, Glen Allen, VA (US)
Assigned to Afton Chemical Corporation, Richmond, VA (US)
Filed by Afton Chemical Corporation, Richmond, VA (US)
Filed on Oct. 22, 2021, as Appl. No. 17/508,308.
Claims priority of provisional application 63/107,851, filed on Oct. 30, 2020.
Prior Publication US 2022/0169944 A1, Jun. 2, 2022
Int. Cl. C10M 145/14 (2006.01); C10M 143/10 (2006.01); C10M 169/04 (2006.01); C10N 30/00 (2006.01); C10N 40/25 (2006.01); C10N 10/04 (2006.01); C10N 20/02 (2006.01); C10N 20/04 (2006.01); C10N 30/02 (2006.01); C10N 30/04 (2006.01); C10N 30/08 (2006.01); C10N 30/10 (2006.01); C10N 30/12 (2006.01); C10N 30/18 (2006.01)
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.