Unoriented composite laminar film with an elastomeric layer and

Details Unoriented composite laminar film with an elastomeric layer and Unoriented composite laminar film with an elastomeric layer and

1975-02-14

1978-04-04

Ives, P. C.

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

428220, 428335, 428425, 428514, 428515, 428516, 428517, 428518, 428520, 264176R, 264 22, 264331, 206819, 260897R, 426392, 426410, 526340, 5263285, 5263291, 53 33, 53 34, 156230, 156244, B65D 3300, B65D 3304, B65D 8530, B65D 8534

Patent

active

040828778

ABSTRACT:
Disclosed is an extensible composite laminar film useful for packaging which includes a first layer of elastomeric polymeric composition and one or more extensible sealable layers of polymeric composition including an interpolymer of ethylene and alkenoic acid or ionomeric salt thereof. In an embodiment the film has a tensile secant modulus of from about 1,000 to about 30,000 and preferably from about 1,000 to about 14,950 pounds per square inch. The film is prepared advantageously by hot blown coextrusion. When stretch wrapped about a variety of products the film typically exhibits a high degree of elastic recovery. Also disclosed is an elastomeric film-forming composition including an ethylene-vinyl acetate interpolymer and an ethylene-propylene interpolymer desirably having a density of not more tha 0.92. The first layer of the film may effectively be prepared from the composition.

REFERENCES:
patent: 3496061 (1970-02-01), Freshour et al.
patent: 3600267 (1971-08-01), McFedries, Jr. et al.
patent: 3607505 (1971-09-01), Schirmer
patent: 3647485 (1972-03-01), Seiferth et al.
patent: 3682767 (1972-08-01), Britton et al.
patent: 3857754 (1974-11-01), Hirata et al.
patent: 3900635 (1975-08-01), Funderburk et al.

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