Patent ID: 6838029
Filing Date: 2005-01-04
Classification: B29B,B29C,B29K,C08F,C08J

Abstract:
1. A method for producing an ethylene-vinyl alcohol copolymer resin, which comprises: (a) introducing into an apparatus an ethylene-vinyl alcohol copolymer solution that contains at least 50 parts by weight of an alcohol having a boiling point of not higher than 100° C., relative to 100 parts by weight of the ethylene-vinyl alcohol copolymer; (b) contacting the ethylene-vinyl alcohol copolymer solution with water in the apparatus, thereby letting alcohol along with water out of the apparatus, and obtaining an aqueous ethylene-vinyl alcohol copolymer composition that contains from 0 to 10 parts by weight of the alcohol and from 10 to 1000 parts by weight of water, relative to 100 parts by weight of the ethylene-vinyl alcohol copolymer; (c) transferring the aqueous ethylene-vinyl alcohol copolymer composition out of the apparatus; (d) feeding the aqueous ethylene-vinyl alcohol copolymer composition into an extruder; (e) kneading the aqueous ethylene-vinyl alcohol copolymer composition in melt in said extruder; and (f) then extruding the copolymer out of the extruder to obtain an extruded ethylene-vinyl alcohol copolymer resin.