Shrink films, and method of making thereof

Patent metadata

Field	Value
Publication number	US-10513095-B2
Application number	US-201515528632-A
Country	US
Kind code	B2
Filing date	Oct 21, 2015
Priority date	Dec 1, 2014
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

A shrink film comprising a polyethylene-based film having a top surface, a bottom surface, and comprising one or more layers, wherein at least one layer of the polyethylene-based film comprises a low density polyethylene having a density of from 0.917 g/cc to 0.935 g/cc and melt index, I2, of from 0.1 g/10 min to 5 g/10 min, a linear low density polyethylene having a density of from 0.900 g/cc to 0.965 g/cc and melt index, I2, of from 0.05 g/10 min to 15 g/10 min, or combinations thereof, and optionally, a medium density polyethylene, a high density polyethylene, or combinations thereof, and a coating layer disposed on the top surface of the polyethylene-based film, wherein the coating layer comprises an adhesive and a near-infrared absorbent material.

First claim

We claim:

1. A shrink film comprising:
a polyethylene-based film having a top surface, a bottom surface, and comprising one or more layers, wherein at least one layer of the polyethylene-based film comprises:
a low density polyethylene having a density of from 0.917 g/cc to 0.935 g/cc and melt index, I2, of from 0.1 g/10 min to 5 g/10 min, a linear low density polyethylene having a density of from 0.900 g/cc to 0.965 g/cc and melt index, I2, of from 0.05 g/10 min to 15 g/10 min, or combinations thereof, and
optionally, a medium density polyethylene, a high density polyethylene, or combinations thereof; and

a coating layer disposed on the top surface of the polyethylene-based film, wherein the coating layer comprises an adhesive and a near-infrared absorbent material having the structure (I):

2. The shrink film of claim 1 , wherein the top surface of the polyethylene-based film is corona-treated.

3. The shrink film of claim 1 , wherein the coating layer comprises from 0.01 wt. % to 30 wt. % of the near-infrared absorbing material.

4. The shrink film of claim 1 , wherein the near-infrared absorbing material absorbs radiation at wavelengths of from 700 nm to 3000 nm.

5. The shrink film of claim 1 , wherein the polyethylene-based film is a multilayer film comprising a core layer and at least one outer layer.

6. The shrink film of claim 5 , where the polyethylene-based film further comprises an intermediate layer positioned between the core layer and the at least one outer layer, wherein the intermediate layer comprises an ethylene-based polymer.

7. The shrink film of claim 1 , wherein the at least one layer of the polyethylene-based film comprises from 5 to 100 wt. %, based on the total polymer weight present in the composition, of the low density polyethylene.

8. The shrink film of claim 1 , wherein the at least one layer of the polyethylene-based film comprises from 5 to 100 wt. %, based on the total polymer weight present in the composition, of the linear low density polyethylene.

Assignees

• Dow Global Technologies Llc

Inventors

• Leano Mauricio E
• Elowe Paul R
• Leugers Mary Anne
• Bhattacharjee Debkumar
• Pangburn Todd O
• Peterson Bruce
• Toyli Matthew

Classifications

• C08J7/0427

  with only one layer of a composition containing a polymer binder (with more layers C08J7/042) · CPC title

• B32B2270/00

  Resin or rubber layer containing a blend of at least two different polymers · CPC title

• B32B2307/418

  Refractive · CPC title

• C09B23/00

  Methine or polymethine dyes, e.g. cyanine dyes · CPC title

• B32B2307/732

  Dimensional properties · CPC title