N-VINYL CYCLIC LACTAM GRAFT COPOLYMER AND ITS PRODUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a N-vinyl cyclic lactam graft copolymer prepared by graft-polymerization of a monomer containing an amino group, with a polymer having a N-vinyl cyclic lactam unit, and provide its production method. SOLUTION: The graft copolymer is obtained by the graft polymerization of the monomer containing an amino group in highly concentrated solution exceeding 10% of the polymer having a N-vinyl cyclic lactam unit at a concentration of a radical initiator being more than 1 mol% to the monomer forming a graft-chain.