Preparing crystalline polyvinylpyrrolidone by radical initiated polymerization in the presence of an initiator, where the polymerization is a drop polymerization

摘要

Preparation of crystalline polyvinylpyrrolidone (I) by radical initiated polymerization in the presence of an initiator, is claimed, where the polymerization is a drop polymerization, provided that the weight ratio of monomer to initiator is selected in such a way that the portion of initiator is 2-40 wt.%, based on the sum of radical initiators and monomers.