Multilayered antioxidant film

Details Multilayered antioxidant film Multilayered antioxidant film

1993-12-17

1996-10-08

Nold, Charles

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264211, 264514, 264515, 2642091, 264343, 264466, B29C 4706, B29C 5528

Patent

active

055628745

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.

REFERENCES:
patent: 2991193 (1961-07-01), Fessler et al.
patent: 3429717 (1974-06-01), Cook
patent: 3814821 (1974-06-01), Oliver et al.
patent: 4624679 (1986-11-01), McEstee
patent: 4880696 (1989-11-01), Yanidis
patent: 5382391 (1995-01-01), Juhl et al.

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