Kureha Chemical Industry Company, Limited

Toru Saika

Hideaki Tanaka

Hiroyuki Oba

Hiroyuki Ohba

Tomohisa Hasegawa

Katsumi Kawaguchi

Tomoaki Sato

Tomonori Hosoda

A film selectively permeable to carbon dioxide gas which includes chitosan having a degree of deacetylation of 70 mol % or higher and in which the ratio of the carbon dioxide gas transmission (CO TR) to the oxygen gas transmission (O TR), (CO TR/O TR), is 15 or higher and a food packaging film made from such a film. The films are insoluble in water, are highly safe from the standpoint of food hygiene, and have such selective gas permeability that the ratio of carbon dioxide gas transmission to oxygen gas transmission is high, which can be economically obtained.

Film selectively permeable to carbon dioxide gas and food packaging film comprising the same

The present invention provides a gas-barrier film which is produced through applying a layer containing a metallic compound to a surface of a processed-polymer layer produced from a mixture of a polyalcohol and at least one poly(meth)acrylic polymer selected from the group consisting of poly(meth)acrylic acids and partially neutralized poly(meth)acrylic acids. The invention also provides a laminated gas-barrier film containing the aforementioned gas-barrier film either surface of which is laminated on with a plastic film. The gas-barrier film exhibits excellent gas-barrier properties and can be produced through a simple, convenient process.

Gas-barrier films

Growing community of inventors

Ibaraki, Japan

Toru Saika