METHOD FOR PRODUCING WATER-SOLUBLE NON-TURBID COPOLYMER OF AT LEAST ONE KIND OF WATER-SOLUBLE N-VINYL LACTAM AND AT LEAST ONE KIND OF HYDROPHOBIC COMONOMER BY POLYMERIZATION UNDER ELEVATED PRESSURE

摘要

PROBLEM TO BE SOLVED: To provide an improved method for producing a copolymer composed of at least one kind of hydrophilic N-vinyl lactam and at least one kind of hydrophobic comonomer and soluble in water to form a transparent solution by the radical copolymerization of the monomers in an organic solvent.;SOLUTION: A vinyl lactam copolymer is produced by the radical polymerization of at least one kind of water-soluble N-vinyl lactam and at least one kind of hydrophobic comonomer in an organic solvent in the presence of an initiator. The polymerization is carried out under a gauge pressure to prevent the evaporation of the components.;COPYRIGHT: (C)2007,JPO&INPIT