Nanocomposite packaging film

Patent metadata

Field	Value
Publication number	US-10131753-B2
Application number	US-201515107613-A
Country	US
Kind code	B2
Filing date	Jan 30, 2015
Priority date	Jan 31, 2014
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

A multi-layered nanocomposite film for use in packaging is provided. More particularly, the film contains at least one core layer positioned adjacent to at least one outer layer. For example, in one embodiment, the film contains a core layer that is positioned between two outer layers. The core layer(s) and/or outer layer(s) may be formed from a polymer composition that contains an ethylene polymer, nanoclay having an organic surface treatment, and a compatibilizer that includes an olefin component and a polar component.

First claim

What is claimed is:

1. A packaging film having a thickness of about 50 micrometers or less, the film containing a core layer that is positioned adjacent to an outer layer, wherein the core layer, the outer layer, or both are formed from a polymer composition, the polymer composition containing from about 70 wt. % to about 99 wt % of an ethylene polymer, from about 0.1 wt. % to about 20 wt. % of a nanoclay having an organic surface treatment, and from 0.05 wt. % to about 15 wt. % of a polyolefin compatibilizer that contains an olefin component and a polar component;
wherein the film exhibits a Young's modulus in the machine direction and/or cross-machine direction of from about 50 to about 500 MPa.

2. The packaging film of claim 1 , wherein the ethylene polymer includes a copolymer of ethylene and an α-olefin.

3. The packaging film of claim 1 , wherein the ethylene polymer includes linear low density polyethylene, low density polyethylene, high density polyethylene, or a mixture thereof.

4. The packaging film of claim 1 , wherein the nanoclay includes a phyllosilicate.

5. The packaging film of claim 4 , wherein the phyllosilicate includes a montmorillonite or a salt thereof.

6. The packaging film of claim 1 , wherein the nanoclay includes platelets having an average thickness of from about 0.2 to about 100 nanometers.

7. The packaging film of claim 1 , wherein the organic surface treatment includes a quaternary onium.

8. The packaging film of claim 1 , wherein the polar component of the compatibilizer includes maleic anhydride.

9. The packaging film of claim 1 , wherein the film exhibits a normalized peak elongation in the machine direction of about 15%/μm or more.

10. The packaging film of claim 1 , wherein the film exhibits a normalized peak elongation in the cross-machine direction of about 40%/μm or more.

11. The packaging film of claim 1 , wherein the film exhibits a normalized ultimate tensile strength in the machine direction and/or cross-machine direction of from about 0.5 to about 20 MPa/μm.

12. The packaging film of claim 1 , wherein the film exhibits a normalized Young's modulus in the machine direction and/or cross-machine direction of from about 5 to about 50 MPa/μm.

13. The packaging film of claim 1 , wherein the outer layer contains the polymer composition.

14. The packaging film of claim 13 , wherein the ethylene polymer includes linear low density polyethylene, low density polyethylene, ethylene copolymer, or a combination thereof.

15. The packaging film of claim 13 , wherein the nanoclay constitutes from about 0.1 wt. % to about 15 wt. % of the polymer composition.

16. The packaging film of claim 1 , wherein the core layer contains the polymer composition.

17. The packaging film of claim 16 , wherein the ethylene polymer includes high density polyethylene.

18. The packaging film of claim 16 , wherein the nanoclay constitutes from about 0.5 wt. % to about 20 wt. % of the polymer composition.

19. The packaging film of claim 16 , wherein the polymer composition includes a blend of low density polyethylene, linear low density polyethylene, and a high density polyethylene.

20. The packaging film of claim 16 , wherein the ethylene polymer includes a linear low density polyethylene, a low density polyethylene, an ethylene vinyl acetate, or a mixture thereof, and wherein the ethylene polymer further includes a high density polyethylene.

21. The packaging film of claim 1 , wherein the film is a blown film.

22. The packaging film of claim 1 , wherein the film is a cast film.

23. The packaging film of claim 1 , wherein the film exhibits a normalized noise level of about 2.5 or less as determined at a frequency of 4,000 Hz, wherein the normalized noise level is determined by dividing the noise level of the film by the noise level of an ambient environment.

24. The packaging film of claim 1 , wherein the film exhibits an oxygen transmission rate of about 350 cm 3 /in 2 *24-hours or less.

Assignees

• Kimberly Clark Co

Inventors

• Wang James Hongxue
• Chen Feng
• Wideman Gregory J
• Faulks Michael J
• Mleziva Mark M

Classifications

• B32B2262/02

  Synthetic macromolecular fibres · CPC title

• C08K3/346

  Clay · CPC title

• B32B2270/00

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

• B32B2307/54

  Yield strength; Tensile strength · CPC title

• C08J5/005

  Reinforced macromolecular compounds with nanosized materials, e.g. nanoparticles, nanofibres, nanotubes, nanowires, nanorods or nanolayered materials · CPC title