Coextruded multilayer film with filler in transport layer

Patent metadata

Field	Value
Publication number	US-10160186-B2
Application number	US-201515505426-A
Country	US
Kind code	B2
Filing date	Aug 25, 2015
Priority date	Aug 26, 2014
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

The present disclosure provides a coextruded multilayer film. The coextruded multilayer film includes a core component having from 10 to 1000 alternating layers of layer A and layer B. Layer A has a thickness from 30 nm to 1000 nm and includes a polymer selected from an ethylene/a-olefin copolymer, an ethylene vinyl acetate polymer (EVA), an ethylene methyl-acrylate copolymer (EMA), an ethylene n-butyl acetate polymer (EnBA), and combinations thereof. Layer B has a thickness from 30 nm to 1000 nm. Layer B is a blend composed of (i) a polymer selected from an ethylene-based polymer, an EVA, an EMA, an EnBA, and combinations thereof, and (ii) a particulate filler material. The core component has a water vapor transmission rate from 50 to less than 500 g-mil/m2/24 hr and a carbon dioxide transmission rate from 50,000 to 300,000 cc-mil/m2/24 hr/atm.

First claim

The invention claimed is:

1. A coextruded multilayer film comprising:
a core component comprising from 10 to 1000 alternating layers of layer A and layer B;
layer A having a thickness from 30 nm to 1000 nm and comprising a polymer selected from the group consisting of an ethylene/α-olefin copolymer, an ethylene vinyl acetate polymer (EVA), an ethylene methyl-acrylate polymer (EMA), an ethylene n-butyl acetate polymer (EnBA), and combinations thereof;
layer B comprising a blend composed of (i) a polymer selected from the group consisting of an ethylene-based polymer, an EVA, an EMA, an EnBA, and combinations thereof, and (ii) a particulate filler material; and
the core component has a water vapor transmission rate (WVTR) from 50 to less than 500 g-mil/m 2 /24 hr and a carbon dioxide transmission rate (CO 2 TR) from 50,000 to 300,000 cc-mil/m 2 /24 hr/atm.

2. The multilayer film of claim 1 wherein layer A has a thickness from 30 nm to 500 nm.

3. The multilayer film of claim 1 wherein layer B has a thickness from 30 nm to 500 nm.

4. The multilayer film of claim 1 wherein the core component comprises from 100 to 200 alternating layers of layer A and layer B.

5. The multilayer film of claim 1 wherein the core component has from 50 to 150 alternating layers of layer A and layer B and the film has a WVTR from 50 to 100 g-mil/m 2 /24 hr and a CO 2 TR from 50,000 to 100,000 cc-mil/m 2 /24 hr/atm.

6. The multilayer film of claim 1 wherein the particulate filler material has an average particle size, D50, from 1 micron to 10 microns.

7. The multilayer film of claim 1 comprising skin layers composed of a blend of ethylene vinyl acetate polymer and an ethylene-based polymer.

8. The multilayer film of claim 1 wherein the multilayer film has a WVTR from 50 to 100 g-mil/m 2 /24 hr and a CO 2 TR from 50,000 to 100,000 cc-mil/m 2 /24 hr/atm.

9. The multilayer film of claim 7 wherein the skin layer blend further comprises a filler.

10. The multilayer film of claim 9 wherein the multilayer film has a WVTR from 60 to 100 g-mil/m 2 /24 hr and a CO 2 TR from 60,000 to 100,000 cc-mil/m 2 /24 hr/atm.

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

12. The article of claim 11 wherein the article is a package and the multilayer film is a component of a peel seal.

Assignees

• Dow Global Technologies Llc

Inventors

• Menning Bruce A
• Mcgee Robert L
• Lee Patrick Chang Dong
• Patel Rajen M

Classifications

• B32B2410/00

  Agriculture-related articles · CPC title

• B32B2439/70

  Food packaging · CPC title

• B32B2307/724

  Permeability to gases, adsorption · CPC title

• B32B27/32

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

• B32B27/306

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