METHOD FOR PRODUCING VINYL AMINE UNIT-CONTAINING POLYMER SOLUTION

摘要

Provided is a method for efficiently producing on an industrial scale a high-performance polyvinylamine solution having good handling properties. After producing a polymer containing N-vinylcarboxamide monomer units having a value of the weight average molecular weight (Mw)/number average molecular weight (Mn) of 5 or higher by aqueous solution standing adiabatic polymerization, the polymer is hydrolyzed in an aqueous solvent in the presence of an alkali and an antigelling agent. In a preferred embodiment of the present invention, a polymer powder having a volatile content of 0.1-12% by mass is obtained by drying and pulverizing after producing a (co)polymer, and the powder obtained is stored or transported to the site of use of the polymer solution and hydrolyzed in an aqueous solvent in the presence of an alkali and an antigelling agent when the polymer solution is needed or at the site of use of the polymer solution.

主权项

1. A method for producing a vinyl amine unit-comprising polymer solution comprising: producing a polymer comprising N-vinylcarboxamide monomer units and having a value of weight average molecular weight Mw/number average molecular weight Mn of at least 5 by an aqueous solution standing adiabatic polymerization method, and then performing hydrolysis on the polymer in an aqueous solvent under the presence of alkali and an antigelling agent.