Selectively gas permeable film for packaging water-containing foods

摘要

A selectively gas permeable film having at least one layer composed of a composition comprising: 50-98% by weight of a saponified product of ethylene-vinyl acetate copolymer; 0-45% by weight of polyvinyl alcohol having a saponification value of 60-95 mol.%; and 0.1% or higher by weight of at least one species having an average molecular weight of 4,000 or lower selected from the group consisting of monomers, oligomers, and polymers of either one of alkylene glycol or hydroxy acid. The content of the at least one species does not exceed its saturation solubility for the sum of the saponified product of ethylene-vinyl acetate copolymer and the polyvinyl alcohol. The selectively gas permeable film has a high ratio of carbon dioxide gas transmission rate to oxygen gas transmission rate. The film is very useful for packaging water-containing foods, especially fermented foods.