| 摘要 |
A high molecular weight, water-soluble polymer, useful as a flocculating agent has the formula: <IMAGE> wherein A represents a repeating unit derived from a hydrophobic vinyl monomer having a water-solubility of less than 5 weight %; R1 and R3 are each a hydrogen atom or a methyl group; R4 and R5 are each a hydrogen atom, a methyl group or an ethyl group; R2 represents a divalent hydrocarbon group having from 2 to 13 carbon atoms; X represents a monovalent cation; B represents a repeating unit derived from an ethylenically-unsaturated carboxylic acid or a salt thereof; m is from 0.1-10 mole %, n is from 1-40 mole %, p is from 20-98.9 mole %, and q is from 0-40 mole % with the proviso that m + n + p + q = 100 mole % and r is a large positive integer. 'A' is suitably styrene, alpha -methyl styrene or vinyl acetate, and in the latter case the polymer may be at least partially hydrolysed to introduce vinyl alcohol units. |
