Puncture-resistant heat shrinkable multilayer packaging film

Stock material or miscellaneous articles – Hollow or container type article – Cellular material derived from plant or animal source

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138118, 1381181, 426105, 426127, 428 36, 428220, 428332, 428336, 428337, 4284231, 4284242, 4284244, 4284246, 428518, 428520, 428522, 428910, 4284233, B32B 2740, C08G 1842

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043484379

ABSTRACT:
A flexible biaxially stretched multilayer film including a layer having a thickness of at least about 0.5 mil and comprising a blend of a polyurethane polymer and an ethylene vinyl acetate copolymer, wherein the weight fraction of ethylene vinyl acetate copolymer in the blend does not exceed 0.40, the film having been subjected to a biaxial stretching in the range of from about 12 to about 20.

REFERENCES:
patent: 3555604 (1971-01-01), Pahlke
patent: 3591561 (1971-07-01), Kazama
patent: 3741253 (1973-06-01), Brax et al.
patent: 3912843 (1975-10-01), Brazier
patent: 3956544 (1976-05-01), Harrington
patent: 3982986 (1976-09-01), Stone
patent: 4123589 (1978-10-01), Korlatzki et al.
patent: 4178401 (1979-12-01), Weinberg
patent: 4196240 (1980-04-01), Lustig et al.
patent: 4296156 (1981-10-01), Lustig
Ency. of Polymer Science & Technology, vol. 5, Interscience Publ., John Wiley & Sons, 1966 pp. 439-441.
Polymer Blends, ed. Dr. Paul and Seymour Newman, vol. 2, Academic Press, 1978, pp. 302-303.
Plastics Compounding, "Survey of Miscible Polymer Systems," Part II, O. Olabisi et al., Mar./Apr. 1980, pp. 51-60.

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