Patent ID: 8057869

Claim:
A gas barrier film having at least one barrier layer comprising an inorganic material on a substrate comprising a plastic film, wherein: the plastic film comprises a multi-layer structure consisting of two layers, wherein the structure is obtained by co-casting film formation or sequential-casting film formation of two layers of polyarylate having a glass transition temperature of 250Â° C. or higher and having a chemical structure represented by the formula (1): wherein X represents a linking group having a naphthalene or biphenyl structure represented by the following chemical structure and A represents a linking group represented by the formula (2): wherein R 1 and R 2 each represents independently an alkyl group or aryl group, j and k each represents independently an integer of from 0 to 4, R 1 may be identical or different with each other when j is 2 or greater and R 2 may be identical or different with each other when k is 2 or greater, wherein a thickness of the plastic film is from 40 to 200 Î¼m.