Transferable modifier-containing film
AssigneeViskase Corporation
InventorsRoger L. Juhl, Stanley Lustig, Donatas Tijunelis
Life of this patent
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Abstract
An extruded film article such as a bag comprises a blend of a thermoplastic polymer such as ethylene vinyl acetate and an olefinic oxide polymer such as poly (ethylene oxide), with a modifier such as liquid smoke absorbed in the blend. The modifier is transferable from the film to a receiving surface such as a food body in fluid transfer relationship with the film.
Claims31
A processable food package comprising an extruded thermoplastic film enclosure filled with processable food having its outer surface in fluid transfer relationship with the film enclosure inner surface, said film enclosure comprising an unreacted blend of a thermoplastic polymer selected from the group consisting of polyolefin, copolymers of olefins and a vinyl comonomer, and polyamide;
- and a poly(ethylene oxide) comprising between about 15 and 40 wt. % of said blend and having a weight average molecular weight of at least about 70,000 and less than 300,000, with a modifier absorbed in said blend, said modifier being transferable from said film enclosure to the food outer surface during processing thereof in said film enclosure at elevated temperature in the presence of surrounding heated water.
A method for making a modified food package comprising the steps of:
- a) providing an extruded film article having walls comprising a blend of an unreacted thermoplastic polymer and an olefinic oxide polymer comprising between about 15 and about 40 wt. % of said blend, and a modifier absorbed in said blend;
- b) filling said film article with processable food such that the food outer surface is in fluid transfer relationship with the modifier-containing film;
- c) processing the food-containing package at elevated temperature in the presence of surrounding heated water to cook said food and simultaneously transfer said modifier from said film package to the water processed food outer surface.
Dependencies are inferred from the claim text.