Multilayer shrink film for high speed packaging lines

Details Multilayer shrink film for high speed packaging lines Multilayer shrink film for high speed packaging lines

2007-02-20

2007-02-20

Nakarani, D. S. (Department: 1773)

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

C264S173140, C264S173150, C264S456000, C264S459000, C428S220000, C428S516000, C428S517000, C428S521000, C428S910000

Reexamination Certificate

active

10792015

ABSTRACT:
A multilayer shrink film and methods of making same comprising high speed polyethylenic outer layers along with one or more cyclic-olefin copolymer (COC) containing inner layers. The multilayer shrink films of the invention are produced using film biaxial orienting means, have haze values of 5 or less and Young's modulus of 50,000 psi or greater and superior hot slip properties. In order to achieve the desired modulus, films of the present invention comprise from 10% to 30% COC and from 2% to 25% softening olefin copolymer. Preferably the film comprises large proportion of linear low density polyethylene (LLDPE). Suitable COCs for use in the invention are limited to single site catalyzed COC.

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Lamonte and Mcnally, “Cyclic Olefin Copolymers.” Advanced Materials & Processes 159(3), Mar. 2001, p. 33 (Ticona, a business of Celanese AG, Summit, NJ).
Lamonte, “Stiffer, Thinner Packaging Films with Improved Sealing Using Cyclic Olefin Copolymers.” 10th Worldwide Flexible Packaging Conference, Amsterdam, Nov. 2000 (Ticona, Summit, NJ).

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