FRANGIBLE HEAT-SEALABLE FILMS FOR COOK-IN APPLICATIONS AND PACKAGES MADE THEREOF

摘要

Coextruded easy-opening film structures having at least three layers for use as a packaging film or as a component thereof suitable for storing and/or cooking food items contained therein. The first film layer includes a material selected from th e group consisting of ethylene/.alpha.-olefin copolymer, propylene/ethylene copolyme r and blends thereof, the second film layer comprises a first modified or unmodified polyolefin and a second modified or unmodified polyolefin which is immiscible in the first modified or unmodified polyolefin; wherein the second layer is disposed between said fir st layer and said third layer. The third layer includes a material selected from the grou p consisting of polyethylene, anhydride-modified polyolefin; ethylene/vinyl alcohol copolyme r, polyamide and blends thereof. The multilayer coextruded frangible films are thermoformable and exhibit a heat seal strength of between 1000-2500 g/in. (393.7-984.3 g/cm) after being submerged in water at 100.degree. C. for one hour upon conducting a Standard Heat Seal Strength Test.