Metallized polyethylene films and related structures

Patent metadata

Field	Value
Publication number	US-2022105714-A1
Application number	US-201917426872-A
Country	US
Kind code	A1
Filing date	Nov 19, 2019
Priority date	Feb 2, 2019
Publication date	Apr 7, 2022
Grant date	—

Abstract

Disclosed herein is a film comprising at least one layer comprising polyethylene and a metal layer, wherein the film has less than 300 parts per million by weight (ppm) of metal stearate and less than 50 ppm stearic acid based on total weight of the film. Also disclosed herein is such a film comprising at least one layer comprising polyethylene and a metal layer wherein the metal layer of at least 38 dyne/cm one week after metallization. Also disclosed herein is an article comprising such a film laminated to a substrate.

First claim

1 . A film comprising at least one layer comprising polyethylene and a metal layer, wherein the film has no more than 300 ppm of metal stearate and no more than 50 ppm stearic acid based on total weight of the film.

2 . The film of claim 1 wherein the film is a multilayer film and a first layer comprises linear low density polyethylene.

3 . The film of claim 2 further wherein the first layer further comprises up to 40 weight percent of low density polyethylene.

4 . The film of claim 2 wherein the first layer further comprises one or more of an anti-oxidant, an anti-block agent, or a processing aid.

5 . The film of claim 2 further comprising a core layer adjacent to the first layer on an opposite side of the first layer from the metal layer.

6 . The film of claim 5 wherein the core layer comprises a polyethylene having a density from 0.935 to 0.970 g/cm 3 or combinations thereof and from 0 to 40 weight percent of a low density polyethylene.

7 . The film of claim 6 wherein die core layer further comprises one or more of antioxidants and non-stearate catalyst neutralizers.

8 . The film of claim 2 further comprising a sealant layer which is on the opposite side of the film from the metal layer and is an outside surface of the film.

9 . The film of claim 8 wherein the sealant layer comprises linear low density polyethylene and from 0 to 40 weight percent low density polyethylene.

10 . The film of claim 1 wherein the at least one layer is surface treated before metallization to form the metal layer.

11 . The film of claim 1 wherein the at least one layer is a cast film, a coextruded, blown film, or an oriented film.

12 . The film of claim 1 having a thickness of 10 to 100 microns and an optical density of 2.0 to 2.8.

13 . The film of claim 1 wherein the at least one layer comprising polyethylene has a modulus in a machine direction of at least 300 MPa.

14 . The film of claim 1 having a surface energy of a surface of the metal layer of at least 38 dyne/cm one week after metallization.

15 . An article comprising the film of claim 1 laminated to a substrate.

16 . The film of claim 1 comprising
a. a first layer comprising linear low density polyethylene and up to 40 weight percent based on the first layer of low density polyethylene, and optionally comprising one or more of an anti-oxidant, an anti-block agent, or a processing aid;
b. a core layer adjacent to the first layer on an opposite side of the first layer from the metal layer, the core layer comprising a polyethylene having a density from 0.935 to 0.970 g/cm3 or combinations thereof and from 0 to 40 weight percent of a low density polyethylene, and optionally further comprising one or more of antioxidants and non-stearate catalyst neutralizers; and
c. a sealant layer which is on the opposite side of the film from the metal layer and is an outside surface of the film wherein the sealant layer comprises linear low density polyethylene and from 0 to 40 weight percent low density polyethylene.

17 . A method comprising providing the film of claim 1 and prim mg on a surface of the metal layer and/or laminating another film to the surface of the metal layer.

18 . The method of claim 17 wherein the printing and/or laminating occurs at least 1 week after metallization.

19 . The method of claim 17 wherein prior to the printing or laminating the film is wound on a roll.

20 . The method of claim 18 wherein the film is stored as a roll for the at least one week.

Assignees

• Dow Global Technologies Llc

Inventors

• Du Zhe
• Pan Jianping
• Yun Xiaobing
• Weng Xilun
• Gupte Kaustubh
• Chen Hongyu

Classifications

• C08J2323/06

  Polyethene · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• C08L23/06

  Polyethylene · CPC title

• B32B2307/724

  Permeability to gases, adsorption · CPC title

• B32B2307/546

  Flexural strength; Flexion stiffness · CPC title