Patent ID: 11891458
Assignee: CHINA PETROLEUM & CHEMICAL CORPORATION
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  E | IPC C  E

Claim 9:
10. The method of claim 1, wherein the obtained starch-containing comprises a graft copolymer formed by starch and a polymerizable monomer selected from at least one of an anionic monomer, a cationic monomer, a nonionic monomer, and a zwitterionic monomer, wherein, the zwitterionic monomer is selected from one or more of methacryloyloxyethyl-N,N-dimethyl propane sulfonate, N,N-dimethyl allyl amine propane sulfonate, 4-vinylpyridine propane sulfonate, N-methyl diallyl propane sulfonate, and N-methyl diallyl butane sulfonate; the cationic monomer is selected from one or more of methacryloyloxyethyl trimethyl ammonium chloride, acryloyloxyethyl trimethyl ammonium chloride, acryloyloxyethyl dimethyl benzyl ammonium chloride, dimethyl diallyl ammonium chloride, and diethyl diallyl ammonium chloride; the anionic monomer is selected from one or more of acrylic acid, 2-methyl-2-acrylamido propane sulfonic acid, fumaric acid, sodium allyl sulfonate, and sodium 2-acryloyloxy isopentene sulfonate; and the nonionic monomer is selected from one or more of N-vinyl pyrrolidone, acrylonitrile, vinyl formamide, and vinyl acetamide.