| 摘要 |
The invention concerns water-soluble copolymers obtained by the radically initiated solution polymerization of: a) between 10 and 99.5 wt % of at least one vinylimidazole of formula (I), in which R1, R2 and R3 are identical or different and stand for H, C1 to C4 alkyl, monomers of formula (II), in which R4 and R5 are identical or different and stand for H, C1 to C4 alkyl or form with one another a ring of between 3 and 5 methylene groups, Nvinyloxazolidone, N-vinyltriazole, 4-vinylpyridine-N-oxide or mixtures of said monomers; b) between 0 and 89.5 wt% of other copolymerizable monoethylenically unsaturated monomers; and c) between 0.5 and 30 wt% of at least one monomer acting as cross-linking agent with at least two ethylenically unsaturated nonconjugated double bonds. The polymerization is carried out in water and/or polar organic solvents in the presence of polymerization control agents, between 0.1 and 5 parts by weight of polymerization control agents being used per 1 part by weight of cross-linking agent. The invention also concerns a process for preparing said copolymers by radically initiated solution polymerization of the monomers in the presence of polymerization control agents, and the use of the copolymers as additives for washing products.
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