US 12,331,246 B2
Polyacrylamide-based symmetric branched polymer surfactant and a process for preparing the same and use thereof
Zhiqing Su, Shanghai (CN); Yingcheng Li, Shanghai (CN); Yanmin Xia, Shanghai (CN); Hui Sun, Shanghai (CN); Hui Xu, Shanghai (CN); Yixing Zhu, Shanghai (CN); and Lan Wang, Shanghai (CN)
Assigned to CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN); and SHANGHAI RESEARCH INSTITUTE OF PETROCHEMICAL TECHNOLOGY, SINOPEC, Shanghai (CN)
Appl. No. 18/250,508
Filed by CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN); and SHANGHAI RESEARCH INSTITUTE OF PETROCHEMICAL TECHNOLOGY, SINOPEC, Shanghai (CN)
PCT Filed Oct. 26, 2021, PCT No. PCT/CN2021/126342
§ 371(c)(1), (2) Date Apr. 25, 2023,
PCT Pub. No. WO2022/089410, PCT Pub. Date May 5, 2022.
Claims priority of application No. 202011156796.1 (CN), filed on Oct. 26, 2020.
Prior Publication US 2023/0392069 A1, Dec. 7, 2023
Int. Cl. C09K 8/588 (2006.01); C08F 220/34 (2006.01)
CPC C09K 8/588 (2013.01) [C08F 220/34 (2013.01); C09K 2208/06 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A polyacrylamide-based symmetric branched polymer surfactant, comprising an acrylamide structure unit, an anionic monomer structure unit, an optional non-ionic monomer structure unit, a branched structure unit, and an optional cationic monomer structure unit, wherein the branched structure unit has at least one of structures of formula (1) and formula (2):

OG Complex Work Unit Chemistry
wherein, R1 is C1-C28 hydrocarbyl; R2 is selected from hydrogen atom, amino, carboxylic acid group, sulfonic acid group, sulfuric acid group, phosphoric acid group, mercapto, and halogen; R3 is hydrogen or methyl; R4 is —O—, —CH2—, —CH2OCH2— or —CH2O—; n is the number of Poly, Poly is independently at least one of

OG Complex Work Unit Chemistry
a and b are each independently 0-40, and a and b are not 0 at the same time.