Patent ID: 6653400
Filing Date: 2003-11-25
Classification: C08F

Abstract:
A method for producing a saponified ethylene-vinyl acetate copolymer, which method comprises:copolymerizing ethylene and vinyl acetate in a methanol solution to form an ethylene-vinyl acetate copolymer; saponifying the copolymer in a methanol solution, to obtain a saponified copolymer; after the saponifying, adding water to the methanol solution containing the saponified copolymer, thereby to prepare a mixture solution; removing insoluble materials from the mixture solution; and obtaining the saponified ethylene-vinyl acetate copolymer from the mixture solution from which the insoluble materials have been removed; wherein at least a part of the insoluble materials is at least one selected from the group consisting of polyvinyl alcohol having a saponification degree of at least 95 mol % and a saponified ethylene-vinyl acetate copolymer having an ethylene content of not more than 10 mol % and a saponification degree of at least 95 mol %.