Vinylamine copolymer, flocculating agent using the same, and process for preparing the same

摘要

Disclosed herein is a vinylamine copolymer having the structural units represented by the general formulae (I), (II) and (III): (I) (wherein X represents an anion or hydroxyl ion) (II) (III) (wherein R1 represents hydrogen atom or a methyl group, R2 represents hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R3 represents an alkyl group having 1 to 4 carbon atoms or an oxoalkyl group having 4 to 8 carbon atoms) in which the molar fraction of the structural unit (I) is 5 to 85% by mole, the molar fraction of the structural unit (II) is 5 to 85% by mole, and the molar fraction of the structural unit (III) is 90 to 5% by mole, a flocculating agent, a drainage aid and a paper strength increasing agent using such vinylamine copolymer, and a process for producing such vinylamine copolymer.