Abuse-resistant retortable packaging film having oxygen barrier layer containing blend of amorphous polyamide and semicrystalline polyamide

摘要

Disclosed is a process of preparing a retorted packaged product, comprising: (A) placing a product in a packaging article comprising a multilayer packaging film heat sealed to itself, the multilayer packaging film having a total free shrink of less than 10 percent at 185 degrees F, the multilayer packaging film comprising: (1) a crosslinked first outer layer which serves as a seal layer and product contact layer, and (2) a crosslinked O2-barrier layer comprising a blend of: (i) from 50 to 95 weight percent, based on blend weight, of polyamide-6I/6T; and (ii) a semi-crystalline polyamide comprising at least one member selected from (a) from 5 to 50 percent, based on blend weight, of PA-MXD,6/MXD,I; and (b) from 5 to 15 percent, based on blend weight, of a nucleated or non-nucleated polyamide having a viscosity number of 150 milliliters per gram to 245 milliliters per gram as measured in accordance with ISO Test Method 307; (B) sealing the article closed so that the product is surrounded by the multilayer packaging film; and (C) heating the packaged product to a temperature of at least 212 degrees for a period of at least half an hour, in the presence of pressurized steam.