| 摘要 |
The invention relates to copolymers which comprise, polymerized into them, ( A) 60 to 90 % by weight of at least one monoethylenically unsaturated polyalkylene oxide monomer of general formula (I), wherein X represents -CH2 - or -CO-, if Y represents -O-; -CO-, if Y represents -NH, Y represents -O- or - NH-; R1 represents hydrogen or methyl; R2 represents the same or different C 2- C6 alkylene groups that can be linear or branched and that can be arranged b y blocks or at random; R3 represents hydrogen or a C1-C4 alkyl; n is an intege r from 3 to 50, (B) 1 to 40 % by weight of at least one quaternized nitrogenou s monoethylenically unsaturated monomer, (C) 0 to 39 % by weight of anionic monoethylenically unsaturated monomers and (D) 0 to 30 % by weight of other nonionic monoethylenically unsaturated monomers and have an average molecula r weight Mw of 2000 to 100000. The invention also relates to the use of said copolymers as dispersants for clay minerals.
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