| abstract |
A film or laminate which comprises a polycarboxylic acid polymer and a compound of a polyvalent metal, serves as an excellent barrier to gases, e.g., oxygen, and has such resistance that the appearance, shape, and gas-barrier properties are not impaired by neutral water, high-temperature water vapor, or hot water; and a process for industrially easily producing the film or laminate at low cost. The film or laminate is suitable for use as a package, packaging container, or vacuum insulation material for articles which are apt to be deteriorated by oxygen, etc., such as foods, beverages, chemicals, medicines, and metallic precision parts, e.g., electronic parts. Furthermore, a packaging material can be provided therefrom which is suitable for use for articles which are required to be stably insulated from gases over long and should be treated under high-temperature hot-water conditions as in boiling or retortion sterilization. |