Stretch hoods made from ULDPE-rich formulations

Patent metadata

Field	Value
Publication number	US-9238355-B2
Application number	US-201113703794-A
Country	US
Kind code	B2
Filing date	Jul 5, 2011
Priority date	Jul 2, 2010
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

A polymeric, mono- or multilayer stretch hood packaging film with an overall density that does not exceed 0.920 g/cc includes: A. At least one core layer containing: 1. At least 50 wt % ULDPE with a density of 0.900 to 0.920 g/cc; and 2. Optionally at least one of: a. LDPE with a density of 0.915 to 0.925 g/cc, and b. EVA with a VA content of 4 to 20 wt %; and B. Optionally, two skin layers, each skin layer independently comprising: 1. At least 50 wt % ULDPE with a density of 0.900 to 0.920 g/cc; and 2. Optionally an LDPE with a density of 0.915 to 0.925 g/cc.

First claim

What is claimed is:

1. A polymeric, multilayered stretch hood packaging film with an overall density that does not exceed 0.920 g/cc and comprising:
A. A core layer comprising:
1. 80 to 50 wt % of the film; and
2. consisting essentially of from less than 100 to 50 wt % ULDPE with a density of 0.900 to 0.920 g/cc and from greater than 0 to 50 wt % EVA with a vinyl acetate content of 5 to 20 wt %; and

B. Two skin layers each comprising:
1. 10 to 25 wt % of the film; and
2. from less than 100 to 75 wt % ULDPE with a density of 0.900 to 0.920 g/cc, and no greater than 25 wt % LDPE with a density of 0.915 to 0.925 g/cc.

2. The film of claim 1 in which the ULDPE comprises at least 75 wt % of the core layer.

3. The film of claim 1 in which the skin layers are the same.

4. The film of claim 1 in which the skin layers are different.

5. The film of claim 1 , wherein the ULDPE is present in the core layer in an amount of 70 wt %.

6. The film of claim 1 , wherein the melt index of the ULDPE in the skin layers and the core layer is 1 g/10 min.

7. The film of claim 1 , wherein the density of the ULDPE is from 0.903 to 0.913 g/cc.

8. The film of claim 1 , wherein the density of the ULDPE is 0.905.

9. A polymeric, multilayered stretch hood packaging film with an overall density that does not exceed 0.920 g/cc and comprising:
A. Two skin layers each comprising:
1. 10-25 wt % of the film, and
2. from less than 100 wt % to 75 wt % ULDPE with a density of 0.900 to 0.920 g/cc and no greater than 25 wt % of at least one of LDPE with a density of 0.915-0.925 g/cc and EVA comprising 5-20 wt % of vinyl acetate;

B. Two core layers each comprising:
1. 10-25 wt % of the film, and
2. 100 to 50 wt % ULDPE with a density of 0.900 to 0.920 g/cc and 0 to 50 wt % of at least one of LDPE with a density of 0.915-0.925 g/cc and EVA comprising 5-20 wt % of vinyl acetate; and

C. One core layer comprising:
1. 70-25 wt % of the film, and
2. consisting essentially of from less than 100 wt % to 50 wt % ULDPE with a density of 0.903 to 0.913 g/cc and from greater than 0 to 50 wt % of EVA comprising 5-20 wt % of vinyl acetate.

10. A polymeric, multilayered stretch hood packaging film with an overall density that does not exceed 0.920 g/cc and comprising:
A. At least one core layer comprising:
1. at least 50 wt % of ULDPE with a density of 0.900 to 0.920 g/cc; and
2. from greater than 0 to 50 wt % EVA with a vinyl acetate content of 5 to 20 wt %; and

B. Two skin layers each comprising:
1. at least 50 wt % of ULDPE with a density of 0.900 to 0.920 g/cc; and
2. optionally, an LDPE with a density of 0.915 to 0.925.

11. The film of claim 10 , wherein the core layer consists essentially of the ULDPE and the EVA.

Assignees

• Bensason Selim
• Mayer Andreas
• Manrique Antonio
• Dow Global Technologies Llc

Inventors

• Bensason Selim
• Mayer Andreas
• Manrique Antonio

Classifications

• Y10T428/31909

  Next to second addition polymer from unsaturated monomers · CPC title

• C08J2323/04

  Homopolymers or copolymers of ethene · CPC title

• B32B2553/00

  Packaging equipment or accessories not otherwise provided for · CPC title

• B32B27/306 Primary

  comprising vinyl acetate or vinyl alcohol (co)polymers · CPC title

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title