COMPOSITE BARRIER FILM AND PROCESS FOR PRODUCING THE SAME

摘要

A composite barrier film is produced by coating at least one surface of a substrate film first with an anchor coat layer comprising: (A) a chlorine-containing resin, such as a vinyl chloride/vinyl acetate copolymer; (B) a polyisocyanate compound; and (C) a saturated polyester resin having a glass transition temperature of -10 to 20 DEG C and substantially unreactive with the polyisocyanate compound and then with an inorganic layer of silicon oxide or the like. The component (C) comprises a noncrystalline saturated polyester having a hydroxyl value of 0 to 15 mg KOH/g or an acid value of 0 to 10 mg KOH/g. The anchor coat layer comprises 100 parts by weight of the component (A), 10 to 500 parts by weight of the component (B), and about 1 to 50 parts by weight of the component (C). The composite film, even when exposed to severe conditions such as retorting, is less likely to cause a lowering in tight adhesiveness and barrier property.