Patent ID: 7157147

Claim:
A gas-barrier film which is a laminate comprising a substrate layer comprising a thermoplastic resin film and a gas-barrier layer laminated thereon comprising a hydrolysate of a silicon alkoxide, a stratified silicate and a polyvinyl alcohol base resin, wherein a radius (Rg) of gyration of a scattering matter which is measured by light scattering in the gas-barrier layer described above is 2.4 μm or less, and the silicon alkoxide and/or a hydrolysate thereof are present between the layers of the stratified silicate present in the above gas-barrier layer, said gas-barrier film being produced by hydrolyzing a part or the whole part of a silicon alkoxide in the presence of a stratified silicate dispersed in an aqueous solution of a polyvinyl alcohol base resin in which a pH is controlled to 1 to 5, applying thus obtained aqueous solution on a substrate layer comprising a thermoplastic resin film and drying the same.