METHODS FOR MAKING POLYMERS FROM N-VINYL ACETAMIDE MONOMER

摘要

The present invention is directed to precipitation polymerization processes for the manufacture of essentially non-crosslinked polymers prepared from N-vinyl acetamide monomer which exhibit reduced levels of residual non-polymerizable contaminants, particularly residual acetamide, the processes including the steps of contacting the N-vinyl acetamide monomer with a polymerization medium containing a diluent selected from ethyl acetate and acetone and a free-radical initiator, under conditions effective to polymerize the N-vinyl acetamide monomer, thereby forming a precipitate of the polymer in the polymerization medium; and isolating the precipitated polymer from the polymerization medium.