Heat shrinkable multilayer packaging film of blended copolymers

Details Heat shrinkable multilayer packaging film of blended copolymers Heat shrinkable multilayer packaging film of blended copolymers

1978-01-18

1980-04-01

Ives, P. C.

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

428218, 428516, 428520, 428910, 206819, 426392, 426410, 229 53, B65D 3300, B65D 3304, B32B 2708

Patent

active

041962400

ABSTRACT:
A heat-shrinkable multilayer film suitable for use in the packaging of a frozen poultry, includes a first outer layer comprising a blend of propylene-ethylene copolymer having a high isotactic molecular structure with less than about 6% by weight being ethylene and having a melt flow of from about 1.5 to about 18 decigrams per minute; a (butene-1)-ethylene copolymer having a high isotactic molecular structure with less than about 10% by weight ethylene and having a melt flow of from about 0.1 to about 5.0 decigrams per minute, and a thermoplastic elastomer selected from the group consisting of ethylene-propylene copolymers and ethylene-propylene diene terpolymers, the ratio by weight of the propylene-ethylene copolymer to the (butene-1)-ethylene copolymer being from about 2:1 to about 1:2 and the thermoplastic elastomer being present from about 10% to about 50% by weight, and a second outer layer comprising an ethylene-(butene-1) copolymer having a melt flow of from about 0.1 to about 1.0 decigram per minute, having a density of from about 0.916 to about 0.920 gram per cubic centimeter, and being a linear polymer; the multilayer film being biaxially oriented.

REFERENCES:
patent: 3634552 (1972-01-01), Foglia et al.
patent: 3634553 (1972-01-01), Foglia et al.
patent: 3900635 (1975-08-01), Funderburk et al.
patent: 4078020 (1978-03-01), Rose et al.
patent: 4082877 (1978-04-01), Shadle

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