Water-soluble cationic copolymers and their use as flocculants and drainage retention aids

摘要

A water-soluble cationic copolymer having the general formula: wherein Z represents -C(=O)O(CH2)n N(+)R4R5R6X(-), -C(=O)NH(CH2)n N(+)R4R5R6X(-), or residual groups of -CH2N(+)(R4R5)CH2CH=CH2X(-) or mixtures thereof, and n is 1 to 5; R1, R2 and R3 are independently selected from the group consisting of H or C1 to C3 alkyl; R4, R5 and R6 are independently C1 to C3 alkyl; and X is a halide, hydroxyl or alkylsulfate anion; and wherein x, y, and q represent molar percents of monomeric units in the copolymer such that q is 1 to 99 mol %, and the molar ratio of x to y is from 0 to 10. The copolymers of this invention are useful as flocculating agents and as drainage/retention aids in pulp and papermaking operations.