Co-extruded multi-layer tube for use in forming flexible bags

Patent metadata

Field	Value
Publication number	US-11141965-B2
Application number	US-201916422017-A
Country	US
Kind code	B2
Filing date	May 24, 2019
Priority date	May 25, 2018
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

A multilayer film including a barrier layer, a sealing layer, and an alcohol barrier layer. The alcohol barrier layer includes cyclic olefin copolymer and is positioned between the barrier layer and the sealing layer. The multilayer film can be used to form a pouch for containing an alcohol-based hand sanitizer.

First claim

We claim:

1. A multilayer film comprising:
a barrier layer;
a sealing layer; and
an alcohol barrier layer;
wherein the alcohol barrier layer is positioned between the barrier layer and the sealing layer;
wherein the alcohol barrier layer comprises a cyclic olefin copolymer; and
wherein the alcohol barrier layer is positioned directly between two polyethylene layers.

2. The multilayer film according to claim 1 , wherein the barrier layer has a higher melting temperature than the sealing layer;
wherein the barrier layer comprises polyamide, copolyamide, nylon 6, nylon 66, polyethylene terephthalate, polyester, polypropylene, medium density polyethylene, a polyolefin plastomer, a polyolefin elastomer, high density polyethylene, low density polyethylene, cyclic olefin copolymer, or blends thereof; and
wherein the barrier layer has a thickness of 5 to 20 microns.

3. The multilayer film according to claim 1 , wherein the sealing layer comprises polyethylene, a copolymer of ethylene, polypropylene, a copolymer of propylene, a polyolefin elastomer, a polyolefin plastomer, ethylene-vinyl acetate, low density polyethylene, linear low density polyethylene, ethylene-methyl acrylate, ethylene-ethyl acrylate, ethylene butyl acrylate, or blends thereof; and
wherein the sealing layer has a thickness of 1 to 200 microns.

4. The multilayer film according to claim 1 , wherein the alcohol barrier layer substantially prevents alcohol from passing through the multilayer film.

5. The multilayer film according to claim 1 , wherein the alcohol barrier layer has a thickness of 1 to 100 microns.

6. The multilayer film according to claim 1 , further comprising a tie layer that is positioned between the barrier layer and the alcohol barrier layer;
wherein the tie layer comprises maleic anhydride grafted polyethylene; a copolymer of ethylene; maleic anhydride grafted linear low-density polyethylene; or blends thereof; and
wherein the tie layer has a thickness of 1 to 100 microns.

7. The multilayer film according to claim 1 , wherein the multilayer film is formed as a tube, with the barrier layer forming an outer layer of the tube and the sealing layer forming an inner layer of the tube.

8. The multilayer film according to claim 1 , wherein the multilayer film is produced by blown film extrusion.

9. The multilayer film according claim 1 , wherein the multilayer film forms a pouch that contains alcohol.

10. The multilayer film according to claim 9 , wherein the pouch is a fluid reservoir for a fluid dispenser and contains an alcohol-based hand cleaning fluid, the hand cleaning fluid comprising 70% to 100% alcohol.

11. The multilayer film according to claim 9 , wherein the barrier layer forms an outer layer of the pouch and the sealing layer forms an inner layer of the pouch; and
wherein the pouch is sealed by heating the multilayer film so that the sealing layer of a first portion of the pouch melts to form a seal with the sealing layer of a second portion of the pouch, without melting the barrier layer.

12. The multilayer film according to claim 1 , wherein the multilayer film is transparent, flexible, and has a thickness of 110 to 160 microns.

13. The multilayer film according to claim 1 , wherein the barrier layer comprises low density polyethylene, medium density polyethylene, high density polyethylene, a polyolefin plastomer, a polyolefin elastomer, cyclic olefin copolymer, or blends thereof; and
wherein the barrier layer has a higher melting temperature than the sealing layer.

14. The multilayer film according to claim 1 , wherein the barrier layer comprises nylon 6 or polyethylene terephthalate; and
wherein the sealing layer comprises low density polyethylene.

15. A multilayer film comprising:
a barrier layer;
a sealing layer; and
an alcohol barrier layer;
wherein the alcohol barrier layer is positioned between the barrier layer and the sealing layer;
wherein the alcohol barrier layer comprises a cyclic olefin copolymer;
wherein the barrier layer comprises nylon 6 or polyethylene terephthalate;
wherein the sealing layer comprises low density polyethylene;
wherein the multilayer film further comprises a tear resistance layer that is positioned between the barrier layer and the alcohol barrier layer; and
wherein the tear resistance layer comprises low density polyethylene.

16. A multilayer film comprising:
a barrier layer;
a sealing layer; and
an alcohol barrier layer;
wherein the alcohol barrier layer is positioned between the barrier layer and the sealing layer;
wherein the alcohol barrier layer comprises a cyclic olefin copolymer;
wherein the barrier layer has a higher melting temperature than the sealing layer;
wherein the multilayer film further comprises a tear resistance layer that is positioned between the barrier layer and the alcohol barrier layer;
wherein the tear resistance layer comprises low density polyethylene;
wherein the barrier layer comprises a blend of high density polyethylene and low density polyethylene, or a blend of high density polyethylene, cyclic olefin copolymer, and low density polyethylene; and
wherein the sealing layer comprises low density polyethylene.

17. The multilayer film according to claim 15 , wherein the barrier layer has a higher melting temperature than the sealing layer;
wherein the barrier layer has a thickness of 5 to 20 microns;
wherein the sealing layer has a thickness of 1 to 200 microns;
wherein the alcohol barrier layer substantially prevents alcohol from passing through the multilayer film;
wherein the alcohol barrier layer has a thickness of 1 to 100 microns;
wherein the multilayer film is produced by blown film extrusion; and
wherein the multilayer film is transparent, flexible, and has a thickness of 110 to 160 microns.

18. The multilayer film according to claim 17 , wherein the multilayer film forms a pouch that contains alcohol; and
wherein the pouch is a fluid reservoir for a fluid dispenser and contains an alcohol-based hand cleaning fluid, the hand cleaning fluid comprising 70% to 100% alcohol.

19. The multilayer film according to claim 16 , wherein the barrier layer has a thickness of 5 to 20 microns;
wherein the sealing layer has a thickness of 1 to 200 microns;
wherein the alcohol barrier layer substantially prevents alcohol from passing through the multilayer film;
wherein the alcohol barrier layer has a thickness of 1 to 100 microns;
wherein the multilayer film is produced by blown film extrusion; and
wherein the multilayer film is transparent, flexible, and has a thickness of 110 to 160 microns.

20. The multilayer film according to claim 19 , wherein the multilayer film forms a pouch that contains alcohol; and
wherein the pouch is a fluid reservoir for a fluid dispenser and contains an alcohol-based hand cleaning fluid, the hand cleaning fluid comprising 70% to 100% alcohol.

Assignees

• Op Hygiene Ip Gmbh

Inventors

• Ophardt Heiner
• Mirbach Ali
• Geurts Patrick

Classifications

• B32B27/08 Primary

  of synthetic resin · CPC title

• B32B2307/31

  Heat sealable · CPC title

• B32B27/325 Primary

  comprising polycycloolefins · CPC title

• B29L2031/712

  Containers; Packaging elements or accessories, Packages (closures therefor B29L2031/56; ink or toner cartridges B29L2031/7678; squeeze tubes B29L2023/20; suitcases B29L2031/7418) · CPC title

• B32B2307/7242

  Non-permeable · CPC title