Barrier film

Abstract

A multi-layer oxygen barrier film, comprising: a base film layer comprising a polyolefin; an oxygen barrier layer comprising a vinyl alcohol-based polymer; and a primer layer comprising polyethyleneimine, wherein the primer layer has a coat weight of at least about 0.005 g / m2.

Description

A multilayer oxygen barrier membrane includes: a base film layer comprising a polyolefin; an oxygen barrier layer comprising a vinyl alcohol-based polymer; and a base coating layer comprising polyethyleneimine, wherein the base coating has a coating weight of at least about 0.005 g / m². Abstract

Claims

CLAIMS 1. A multi-layer oxygen barrier film, comprising: a base film layer comprising a polyolefin; an oxygen barrier layer comprising a vinyl alcohol-based polymer; and a primer layer comprising polyethyleneimine, wherein the primer layer has a coat weight of at least about 0.005 g / m2.

2. The multi-layer oxygen barrier film according to claim 1, comprising a single oxygen barrier layer comprising a vinyl alcohol-based polymer.

3. The multi-layer oxygen film according to any one of claims 1 to 2 wherein the multi-layer film does not comprise a second water-based coating layer.

4. The multi-layer oxygen barrier film according any one of claims 1 to 3, wherein the vinyl alcohol-based polymer comprises polyvinyl alcohol and / or ethylene vinyl alcohol.

5. The multi-layer oxygen barrier film according to any one of claims 1 to 4, wherein the vinyl alcohol-based polymer comprises polyvinyl alcohol.

6. The multi-layer oxygen barrier film according to any one of claims 1 to 5, wherein the oxygen barrier layer has a coat weight of from about 0.1 g / m2to about 10 g / m2, from about 0.2 g / m2to about 5 g / m2, or from about 0.5 g / m2to about 2 g / m2.

7. The multi-layer oxygen barrier film according to any one of claims 1 to 6, wherein the oxygen barrier layer is absent of any crosslinker and / or adhesion promoter, optionally wherein the oxygen barrier layer is absent of both crosslinker and adhesion promoter.

8. The multi-layer oxygen barrier film according to any one of claims 1 to 7, wherein the primer layer has a coat weight of at least about 0.01 g / m2.

9. The multi-layer oxygen barrier film according to any one of claims 1 to 8, wherein the primer layer has a coat weight of from about 0.01 g / m2to about 5 g / m2, from about 0.01 g / m2to about 2 g / m2, from about 0.01 g / m2to about 1 g / m2, from about 0.01 g / m2to about 0.5 g / m2, from about 0.01 g / m2to about 0.1 g / m2, or from about 0.01 g / m2to about 0.05 g / m2.

10. The multi-layer oxygen barrier film according to any one of claims 1 to 9, wherein the primer layer is adjacent to the oxygen barrier layer.

11. The multi-layer oxygen barrier film according to any one of claims 1 to 10, wherein the primer layer is located between the base film layer and the oxygen barrier layer.

12. The multi-layer oxygen barrier film according to any one of claims 1 to 11, wherein the base film layer comprises polypropylene.

13. The multi-layer oxygen barrier film according to any one of claims 1 to 12, wherein the base film layer comprises biaxially oriented polypropylene.

14. The multi-layer oxygen barrier film according to any one of claims 1 to 13, wherein the film comprises one or more additional layers selected from: a sealable layer; a printable layer; a metallised layer; and / or a functional and / or aesthetic coating.

15. The multi-layer oxygen barrier film according to any one of claims 1 to 14 wherein the film does not comprise a metallised layer.

16. The multi-layer oxygen barrier film according to any one of claims 1 to 15, wherein the thickness of the multi-layer barrier film is from about 10 µm to about 240 µm.

17. The multi-layer oxygen barrier film according to any one of claims 1 to 16, wherein the film exhibits an oxygen transmission rate when measured in accordance with ASTM D3985 of below about 5 cm3 / m2 / 24 hr, or below about 3 cm3 / m2 / 24 hr, or below about 1 cm3 / m2 / 24 hr, or below about 0.5 cm3 / m2 / 24 hr at a relative humidity of 0%.

18. The multi-layer oxygen barrier film according to any one of claims 1 to 17, wherein the film exhibits an oxygen transmission rate when measured in accordance with ASTM F1927-14 of below about 20 cm3 / m2 / 24 hr, or below about 10 cm3 / m2 / 24 hr, or below about 5 cm3 / m2 / 24 hr, or below about 3 cm3 / m2 / 24 hr, at a relative humidity of 50%.

19. Use of the multi-layer oxygen barrier film according to any one of claims 1 to 18 as a packaging film.

20. A package formed, at least in part, from a multi-layer barrier film according to any one of claims 1 to 18.

21. An article wrapped or packaged in a material comprising a multi-layer oxygen barrier film according to any one of claims 1 to 18.

22. A method for manufacturing a multi-layer oxygen barrier film, comprising:a. applying a primer layer comprising polyethyleneimine onto at least one side of a base film layer comprising a polyolefin at a coat weight of at least about 0.005 g / m2; and b. coating the primer layer with an oxygen barrier layer comprising a vinyl alcohol-based polymer.

23. The method according to Claim 22, wherein the vinyl alcohol-based polymer comprises polyvinyl alcohol.

24. The method according to Claim 22 or Claim 23, further comprising the step of corona treating the side of the base film to which the primer layer is applied, prior to step a.

25. The method according to any one of claims 22 to 24, wherein step a. and / or step b. are carried out using a standard coating technique, optionally reverse gravure.

26. The method according to any one of claims 22 to 25, wherein step b. involves coating a vinyl alcohol-based polymer solution onto the primer layer and subsequently drying the layer.

27. The method according to Claim 26, wherein the vinyl alcohol-based polymer solution has a pH of about 11 or less, about 10 or less, about 9 or less, about8 or less, about 7 or less, about 6 or less, about 5 or less, about 4 or less, or about 3 or less.

28. Use of a primer layer comprising polyethyleneimine to decrease the oxygen transmission rate of a multi-layer oxygen barrier film.

29. The use according to Claim 28, wherein the primer layer has a coat weight of at least about 0.005 g / m2.

30. The use according to Claim 28 or Claim 29, wherein the multi-layer oxygen barrier film additionally comprises an oxygen barrier layer comprising a vinyl alcohol-based polymer, optionally polyvinyl alcohol.

31. The use according to any one of claims 28 to 30, wherein the multi-layer oxygen barrier film additionally comprises a base film layer, optionally comprising biaxially oriented polypropylene.