Patent ID: 6746762
Filing Date: 2004-06-08
Classification: B32B,C08J,C08L,Y10T

Abstract:
A film selectively permeable to carbon dioxide gas comprising a laminate film comprising at least three layers composed of an outer layer, an intermediate layer and an inner layer, wherein the outer layer and the inner layer comprise a thermoplastic resin and the intermediate layer comprises a chitosan having a degree of deacetylation 70 mol % or higher and in which a ratio (CO2TR/O2TR) of carbon dioxide gas transmission (CO2TR) to oxygen gas transmission (O2TR) measured at a temperature of 23Â° C. and at a relative humidity (RH) of 80% is 15 or higher, and wherein the ratio (CO2TR/O2TR) of as the laminate film is 10 or higher.