Multilayered antioxidant film
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United States of America Patent
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Oct 8, 1996
Grant Date -
N/A
app pub date -
Dec 17, 1993
filing date -
Dec 17, 1993
priority date (Note) -
Expired
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Abstract
A coextruded multilayer film having increased retention of volatile antioxidants and process for making the film. The multilayer film includes an antioxidant layer containing a volatile antioxidant, said antioxidant layer being semipermeable to the volatile antioxidant; and a barrier layer, impermeable to the volatile antioxidant. The film can be produced on a conventional blown film process with the barrier layer coextruded externally to the antioxidant layer. The barrier layer traps the volatile antioxidant inside the tube of the blown film process, reducing the amount of volatile antioxidant migrating from the film.
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