| abstract |
Polymerized by precipitation polymerization, which contains copolymerized a) 80 to 99.9% by weight of at least one water-soluble non-ionic monomer a) selected from Nvinylpyrrolidone, N-vinylpiperidone, N-vinylcaprolactam, N-vinyl -5-methyl-2-pyrrolidone, N-vinyl-5-ethyl-2-pyrrolidone, N-vinyl-6-methyl-2-piperidone, N-vinyl-6-ethyl-2-piperidone, N-vinyl-7 -methyl-2-caprolactam, N-vinyl-7-ethyl-5 2-caprolactam and b) 0.1 to 20% by weight of a monomer chosen from b1) methacrylamide, b2) compounds that can polymerize by free radicals, which they contain a structural element of the formula b2) ** Formula ** where R and R 'independently represent one another hydrogen, alkyl, cycloalkyl, heterocycloalkyl, aryl or heteroaryl, where R and R' can also be covalently linked, and G represents O or NH, b3) polyhydroxy compounds that carry at least one allylamino group and b4) their mixtures, where the total amount of all monomers Copolymerized is 100% by weight. |