초록 ▼

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, elastic memory, tear resistance and heat shrinkability. Preferred five layer embodiments of th

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, elastic memory, tear resistance and heat shrinkability. Preferred five layer embodiments of the film comprise (1) a core layer of either a low density polyethylene homopolymer or an ethylene vinyl acetate copolymer or a blend of an ethylene vinyl acetate copolymer with a linear low density polyethylene; (2) two adjacent intermediate layers of a linear low density polyethylene and (3) two surface layers of an ethylene vinyl acetate copolymer.

대표청구항 ▼

In a multilayer, thermoplastic packaging film having a layer of ethylene-vinyl acetate copolymer and a layer of linear low density polyethylene, the improvement wherein: (a) said film comprises at least five layers; (b) the material of the central or core layer is selected from the group consisting

In a multilayer, thermoplastic packaging film having a layer of ethylene-vinyl acetate copolymer and a layer of linear low density polyethylene, the improvement wherein: (a) said film comprises at least five layers; (b) the material of the central or core layer is selected from the group consisting of: (1) ethylene-vinyl acetate copolymers, and (2) blends of ethylene-vinyl acetate copolymer with linear low density polyethylene; (c) intermediate layers adjacent each side of the core layer, said intermediate layers consisting essentially a linear low density polyethylene; (d) two surface layers consisting essentially of a copolymer of ethylene-vinyl-acetate; (e) said film having a shrink tension at 205°F. in the transverse and longitudinal directions of approximately 400 p.s.i. or greater; and, (f) said film having an elongation at break at 73°F. in both transverse and longitudinal directions of at least approximately 200%.