Patent ID: 6579933
Filing Date: 2003-06-17
Classification: C08F

Abstract:
A process for the preparation of a monoallylamine polymer aqueous solution, which comprises(a) providing a monoallylamine sulfate having a concentration of 60 to 90% by weight in an aqueous medium, (b) polymerizing the monoallylamine sulfate in the aqueous medium in the presence of a radical polymerization initiator having a molecule containing an azo group and cationic nitrogen, to produce a polyallylamine sulfate polymer, (c) adjusting the concentration of the polyallylamine sulfate polymer in a polymerization solution to less than 60% by weight with an aqueous solvent, and (d) neutralizing the resultant polymerization solution with an alkali aqueous solution, to obtain an aqueous solution containing a high-molecular-weight monoallylamine polymer having a weight average molecular weight, measured by a sedimentation equilibrium method, of 20,000 to 180,000.