| abstract |
The present invention provides a copolymer obtained by polymerization of monomers vinylpyrrolidone, vinylimidazole and vinyloxazolidinone. The polymer is in a specific polymerization degree range and in the presence of a surfactant, especially It can play an excellent anti-dye migration effect in the presence of anionic surfactants, and the addition amount is small. The present invention also provides a polymerization method for the above-mentioned copolymer, which has simple preparation process and mild reaction conditions, and is suitable for large-scale industrial production. |