Heat resistant heat shrinkable films

Details Heat resistant heat shrinkable films Heat resistant heat shrinkable films

1985-03-07

1986-05-20

Buffalow, Edith

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

428518, 428349, 428913, 264176R, 15624411, B65D 1100, B32B 702

Patent

active

045901066

ABSTRACT:
A three layer heat shrinkable film is disclosed, along with preferred process for making it. The film comprises a first heat sealable layer of an ionomer, a second layer of a vinylidene chloride copolymer, and a third layer of a blend of an ionomer and an EVA copolymer. The EVA content is no greater than 20% of the blend by weight, and the vinyl acetate content is at least 4.5% of the blend by weight. In the preferred process, a three layer tape is coextruded and cooled, and reheated to 197.degree.-203.degree. F., and oriented in a conventional double bubble process.

REFERENCES:
patent: 3524795 (1970-08-01), Peterson
patent: 3558399 (1971-01-01), Turner
patent: 3579416 (1971-05-01), Schrenk
patent: 4161562 (1979-07-01), Yoshikawa et al.
patent: 4424243 (1984-01-01), Nishimoto et al.
patent: 4501779 (1985-02-01), Hsu et al.

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