Vinylamine containing copolymer microparticles as additives in papermaking

摘要

Surfactant mediated, free radical initiated emulsion/dispersion polymerization of n-vinylformamide with styrene or substituted styrene copolymers, and its subsequently hydrolyzed products bearing formamide, amine and styrenic functionality are disclosed. Processes for polymerization, polymer composition, and hydrolysis of such polymers are also disclosed. These polymers bearing cationic functionality can be used in papermaking applications as dry strength additives, wet strength additives, retention aids, drainage aids, sizing agent, sizing promoter and pitch and stickies control agents.

主权项

1. A process for making vinylamine-vinylformamide-styrene terpolymer additives comprising:
a) reacting vinylformamide with styrene or substituted styrene under free radical, emulsion polymerization reaction conditions; b) producing a first polymer product which comprises randomly distributed repeating units by the formula (I) and (II):wherein Ar is an aromatic selected from the group consisting of phenyl and phenyl substituted with alkyl, alkoxy, sulfonate, halo and pyridine or substituted pyridine; R1 is hydrogen or alkyl; x and y are numbers greater than zero mole percent, and the sum of x and y is 100 mole percent, the ratio of x:y is in the range of from 99:1 to 50:50;
c) hydrolyzing the first polymer product with an acid or base treatment; d) producing a second polymer product comprising randomly distributed repeating monomer units having at least two of the formula (III), (IV), (V) and (VI): wherein, R2 and R3 are H; R4 is H or alkyl; m1 and m2 independently is a positive mole percent, and m3 and m4 independently is 0 to 99 mole percent, and the sum of m1, m2, m3 and m4 is equal to or less than the x mole percent of formula (I).