High barrier shrink film

Details High barrier shrink film High barrier shrink film

1983-10-03

1985-09-17

Ives, Patrick C.

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

428 36, 428518, 428913, 156229, 15624427, 264176R, 426412, 426105, B32B 2730, B32B 2708

Patent

active

045420750

ABSTRACT:
There is provided a heat shrinkable, high barrier laminate film which includes a hot blown, melt oriented high oxygen barrier film, of relatively high crystallinity and correspondingly relatively low ultimate elongation, laminated to a stretch oriented base film having a shrink tension substantially greater than that of said barrier film, the extent of orientation of said base film being sufficient such that its ultimate elongation is reduced so as to be commensurate with that of said barrier film. In one preferred mode, the barrier film is a layflat tubular film having its interior layflat surfaces laminated together. Representatively, the high barrier layer of the barrier film is vinylidene chloride copolymer having at least about 85% by weight vinylidene chloride content, preferably at least about 90%. Associated methods for making the laminate films are also provided.

REFERENCES:
patent: 3741253 (1973-06-01), Brax et al.
patent: 4424243 (1984-01-01), Nishimoto et al.
patent: 4448792 (1984-05-01), Schirmer

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