Patent ID: 6649732
Filing Date: 2003-11-18
Classification: C08J,C23C,Y02T,Y10S,Y10T

Abstract:
A gas barrier film, comprising a resin layer and a vapor-deposited layer which is applied on at least one side of the resin layer, wherein:the resin layer comprises, as its main component, an aliphatic polyester whose primary repeating unit is represented by a general formula â€”Oâ€”CHRâ€”COâ€” (where R denotes H or an alkyl group having a carbon number of 1-3); the vapor-deposited layer is selected from the group consisting of an aluminum oxide/silicon oxide-based vapor-deposited layer, an aluminum oxide-based vapor-deposited layer and a silicon oxide-based vapor-deposited layer; a content of aluminum oxide in the aluminum oxide/silicon oxide-based vapor-deposited layer is about 20 wt % to about 99 wt %; a â€œbâ€  value, which is calculated according to the following expression (1) based on a specific gravity D of the vapor-deposited layer and the aluminum oxide content A in wt % in the vapor-deposited layer, satisfies the following expression (2): Expression (1): b=Dâˆ’0.01A Expression (2): 1.6&lE;b&lE;2.2 (where D denotes the specific gravity of the vapor-deposited layer, and A denotes the aluminum oxide content in wt % in the vapor-deposited layer); a specific gravity of the aluminum oxide-based vapor-deposited layer is about 2.70 to about 3.30; and a specific gravity of the silicon oxide-based vapor-deposited layer is about 1.80 to about 2.20.