Stretch/shrink film with improved oxygen transmission

Details Stretch/shrink film with improved oxygen transmission Stretch/shrink film with improved oxygen transmission

Filed on

1988-11-17

Date issued

1990-08-28

Examiner

Ives, P. C.

Patent Class

Stock material or miscellaneous articles

SubClass

Structurally defined web or sheet

SubSubClass

Including components having same physical characteristic in...

Other Related Categories

428516, 428520, 428910, 428522, 428331, 428447, 264 22, 2642091, B32B 2708, D03D 3500

Type

Patent

Status

active

Patent number

049524518

Description

ABSTRACT:
A multi-layered thermoplastic polyolefin film having an improved combination of physical characteristics is disclosed. In particular, the multi-layered film evidences an improved combination of elongation, oxygen transmission and heat shrinkability. Preferred five layer embodiments of the film comprises (1) a core layer of either a low density polyethylene homopolymer or an ethylene acetate copolymer or a blend of an ethylene vinyl acetate copolymer with a linear low density polyethylene; (2) two adjacent intermediate layers of a very low density polyethylene with a density of less than 0.900 gms/ccm, and (3) two surface layers of an ethylene vinyl acetate copolymer.

REFERENCES:
patent: 4178401 (1979-12-01), Weinberg et al.
patent: 4279957 (1981-07-01), Hiraoka et al.

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