Coextruded Multilayer Film with Barrier Properties

Patent metadata

Field	Value
Publication number	US-2016144604-A1
Application number	US-201414900442-A
Country	US
Kind code	A1
Filing date	Jun 25, 2014
Priority date	Jun 28, 2013
Publication date	May 26, 2016
Grant date	—

Abstract

The disclosure provides a coextruded multilayer film. The coextruded multilayer film includes a core component having from 15 to 1000 alternating layers of layer A and layer B. Layer A has a thickness from 100 nm to 500 nm and includes an ethylene-based polymer. Layer B has a thickness from 100 nm to 500 nm and includes a cyclic olefin polymer (“COP”). Layer A has an effective moisture permeability less than 0.20 g-mil/100 in 2 /day and an effective oxygen permeability less than 150 cc-mil/100 in 2 /day/atm. In an embodiment, the multilayer film includes skin layers.

First claim

1 . A coextruded multilayer film comprising:
a core component comprising from 15 to 1000 alternating layers of layer A and layer B; layer A having a thickness from 100 nm to 500 nm and comprising an ethylene-based polymer; layer B having a thickness from 100 nm to 500 nm and comprising a cyclic olefin polymer (“COP”); and layer A has an effective moisture permeability less than 0.20 g-mil/100 in 2 /day and an effective oxygen permeability less than 150 cc-mil/100 in 2 /day/atm.

2 . The multilayer film of claim 1 wherein layer A has a thickness from 100 nm to 400 nm; and
Layer B has a thickness from 100 nm to 400.

3 . The multilayer film of claim 1 wherein layer A comprises a high density polyethylene (HDPE) having a density of at least 0.94 g/cc.

4 . The multilayer film of claim 1 wherein the layer A has a thickness from 100 nm to 400 nm and comprises a high density polyethylene having a density from 0.95 g/cc to 0.97 g/cc.

5 . The multilayer film of claim 4 wherein the B layer comprises a cyclic block copolymer.

6 . The multilayer film of claim 5 wherein the cyclic block copolymer comprises a pentablock hydrogenated styrene.

7 . The multilayer film of claim 1 wherein layer A has a thickness from 100 nm to 400 nm and comprises a high density polyethylene having a density from 0.95 g/cc to 0.97 g/cc;
layer B has a thickness from 100 nm to 400 nm and comprises a cyclic block copolymer; and
layer A has an effective moisture permeability from 0.03 to less than 0.1 g-mil/100 in 2 /day and an effective oxygen permeability from 20 to less than 60 cc-mil/100 in 2 /day/atm.

8 . The multilayer film of claim 1 wherein the core component comprises from 60 to 70 alternating layers of layer A and layer B.

9 . The multilayer film of claim 1 wherein layer A comprises HDPE having a density for 0.95 g/cc to 0.97 g/cc and the HDPE comprises a truncated spherulite structure.

10 . The multilayer film of claim 1 wherein the core component has a thickness from 0.1 mil to 10.0 mil.

11 . A multilayer film of claim 1 comprising skin layers.

12 . The multilayer film of claim 11 wherein the multilayer film has an oxygen permeability less than 105 cc-mil/100 in 2 /day/atm and a moisture permeability less than 0.20 g-mil/100 in 2 /day.

13 . The multilayer film of claim 11 wherein at least one skin layer comprises a polyethylene.

14 . The multilayer film of claim 11 wherein each skin layer comprises a high density polyethylene having a density from 0.95 g/cc to 0.97 g/cc.

15 . The multilayer film of claim 11 wherein layer A has a thickness from 100 nm to 400 nm and comprises a high density polyethylene having a density from 0.95 g/cc to 0.97 g/cc;
layer B has a thickness from 100 nm to 400 nm and comprises a cyclic block copolymer; and
the multilayer film has an oxygen permeability from 70 to less than 100 c-mil/100 in 2 /day/atm and a moisture permeability from 0.05 to less than 0.15 g-mil/100 in 2 /day.

16 . The multilayer film of claim 11 wherein the core component comprises from 75% to 65% of total multilayer film volume and the skin layer comprises from 25% to 35% of the total multilayer film volume.

17 . The multilayer film of claim 11 wherein the core component has a thickness of from 0.1 mil to 10 mils.

18 . An article comprising the multilayer film of claim 1 .

Assignees

• Dow Global Technologies Llc

Inventors

• Jenkins Steven R
• Lee Patrick Chang Dong
• Dooley Joseph
• Kirkpatrick Donald E
• Obi Bernard E

Classifications

• B32B2307/724

  Permeability to gases, adsorption · CPC title

• B32B27/302

  comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers · CPC title

• B32B2439/00

  Containers; Receptacles · CPC title

• B32B2250/05

  5 or more layers · CPC title

• B32B27/325

  comprising polycycloolefins · CPC title