Granted Patent B2

US 7,172,815 · App. 10/092,381 · Granted Feb 6, 2007

Abstract

Claims (24)

1. A multilayer stretch film comprising:

a cling layer comprising a heterogeneously branched ultra low density polyethylene and a plastomer;

a non-cling layer comprising a copolymer of propylene and ethylene wherein said copolymer has an ethylene content of about 1% by weight to about 10% by weight; and

at least one core layer comprising from about 97.0–99.9% by weight linear low density polyethylene and from about 0.01–3.0% by weight low density polyethylene.

2. A multilayer stretch wrap film comprising:

at least one first layer comprising a heterogeneously branched ultra low density polyethylene and from about 15% by weight to about 40% by weight of a plastomer;

at least one second layer comprising a polypropylene;

at least one third layer comprising a mixture of a linear low density polyethylene and a low density polyethylene;

wherein said third layer is disposed between said first layer and said second layer.

3. The film of claim 2 , said plastomer being an ethylene copolymerized with a C 3 –C 10 α-olefin.

4. The film of claim 3 , said plastomer being an ethylene copolymerized with a C 8 α-olefin.

5. The film of claim 4 , said plastomer having an unstretched cling of about 250 g and a 200% stretch cling of about 66 g.

6. The film of claim 2 , said plastomer having a density of from about 0.850 to about 0.900 g/cm 3 .

7. The film of claim 2 , said plastomer having a melt index of from about 1.0 to about 20.0 g/10 min.

8. A multilayer stretch wrap film comprising:

at least one first layer comprising a heterogeneously branched ultra low density polyethylene and about 15% by weight of a plastomer;

at least one second layer comprising a polypropylene;

at least one third layer comprising a mixture of a linear low density polyethylene and a low density polyethylene;

wherein said third layer is disposed between said first layer and said second layer.

9. The film of claim 8 , said plastomer being an ethylene copolymerized with a C 8 –C 10 α-olefin.

10. The film of claim 9 , said plastomer being an ethylene copolymerized with a C 8 α-olefin.

11. The film of claim 10 , said plastomer having an unstretched cling of about 250 g and a 200% stretch cling of about 66 g.

12. The film of claim 8 , said plastomer having a density of from about 0.850 to about 0.900 g/cm 3 .

13. The film of claim 8 , said plastomer having a melt index of from about 1.0 to about 20.0 g/10 min.

Assignments (37)