Patent ID: 8445586

Claim:
A process for producing an N-vinylamide polymer by subjecting a monomer component comprising N-vinylamide to aqueous solution polymerization, said process comprising the step of polymerizing the monomer component comprising N-vinylamide in the presence of an inorganic salt, which inorganic salt is present in an amount of not less than 7% by mass based on water in a uniform aqueous solution comprising the monomer component at a concentration not more than a saturated solution concentration thereof as measured at a polymerization initiation temperature wherein the aqueous solution polymerization is carried out by an aqueous solution standing adiabatic polymerization method or a belt photopolymerization method, and the resulting N-vinylamide polymer is taken out in the form of powdered particles obtained by finely dividing an aqueous gel of the N-vinylamide polymer.