Coextruded multilayer film with beta-propylene-based barrier layer

Patent metadata

Field	Value
Publication number	US-10259154-B2
Application number	US-201515314179-A
Country	US
Kind code	B2
Filing date	May 27, 2015
Priority date	May 27, 2014
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

The present 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 10 nm to 1000 nm and includes a beta-propylene-based polymer having a crystallization temperature (T 1 c). Layer B includes a second polymer having a glass transition temperature (T 2 g), wherein T 1 C<T 2 g. Layer A has an effective moisture permeability less than 6.2 g-mil/m 2 /24 hrs.

First claim

The invention claimed is:

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 10 nm to 1000 nm and comprising a beta-propylene-based polymer having a crystallization temperature (T 1 c), layer A comprising truncated spherulites;
layer B comprising a second polymer having a glass transition temperature (T 2 g), wherein T 1 c<T 2 g; and
layer A has an effective moisture permeability less than 6.2 g-mil/100 in 2 /day.

2. The coextruded multilayer film of claim 1 wherein the Layer A comprises at least 80% of beta-propylene-homopolymer.

3. The coextruded multilayer film of claim 1 wherein the Layer A comprises at least 90% of beta-propylene-homopolymer.

4. The coextruded multilayer film of claim 1 wherein the Layer A comprises at least 95% of beta-propylene-homopolymer.

5. The multilayer film of claim 1 wherein layer A has a thickness from 10 nm to 500 nm.

6. The multilayer film of claim 1 wherein layer A comprises a beta-propylene-homopolymer with a T 1 c from 100° C. to 130° C.

7. The multilayer film of claim 1 wherein the beta-propylene-homopolymer has a melt flow rate from 1.5 g/10 min to 2.5 g/10 min.

8. The multilayer film of claim 1 wherein the second polymer is selected from the group consisting of a polycarbonate and a cyclic olefin polymer.

9. The multilayer film of claim 1 wherein layer A comprises a beta-propylene-homopolymer with a T 1 c from 100° C. to 130° C. and a melt flow rate from 1.5 g/10 min to 2.5 g/10 min; and
layer B comprises a polycarbonate with a T 2 g greater than 130° C.

10. The multilayer film of claim 1 wherein T 2 g−T 1 c is greater than 20° C.

11. The multilayer film of claim 1 wherein layer A has a thickness from 10 nm to 50 nm and layer A has an effective moisture permeability less than 5.0 g-mil/m 2 /24 hrs.

12. The multilayer film of claim 1 wherein the core component has a thickness from 2.5 micrometers to 250 micrometers.

13. The multilayer film of claim 1 comprising skin layers.

14. The multilayer film of claim 13 wherein at least one skin layer is selected from the group consisting of a propylene-based polymer and an ethylene-based polymer.

Assignees

• Dow Global Technologies Llc

Inventors

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

Classifications

• B32B27/32

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

• B32B2307/704

  Crystalline · CPC title

• B32B2307/732

  Dimensional properties · CPC title

• B29L2007/008

  Wide strips, e.g. films, webs · CPC title

• B32B2250/24

  All layers being polymeric · CPC title