Peelable film for container lid

Patent metadata

Field	Value
Publication number	US-9254628-B2
Application number	US-201414211969-A
Country	US
Kind code	B2
Filing date	Mar 14, 2014
Priority date	Mar 15, 2013
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

A peelable multilayer film includes a seal layer (peel layer) and at least one core layer. The peelable multilayer film can bond to a container.

First claim

The invention claimed is:

1. A peelable multilayer film comprising
a seal layer comprising a polypropylene copolymer and
at least one core layer comprising ethyl vinyl acetate (EVA) and polybutene-1 (PB-1),
wherein the core layer comprising EVA and PB-1 is directly adjacent to the seal layer and
wherein the seal layer further comprises a slip agent and the slip agent is erucamide.

2. The film of claim 1 , wherein the film comprises five layers.

3. The film of claim 1 , further comprising a second core layer comprising LLDPE.

4. The film of claim 3 , further comprising a third core layer comprising polypropylene.

5. The film of claim 4 , further comprising a fourth core layer comprising LDPE.

6. The film of claim 4 , further comprising a fourth core layer comprising LLDPE.

7. The film of claim 1 , further comprising a second core layer comprising LDPE and LLDPE.

8. The film of claim 1 , further comprising a second core layer comprising LLDPE, a third core layer comprising polypropylene, and a fourth core layer comprising LDPE.

9. The film of claim 1 , further comprising a second core layer comprising LLDPE, a third core layer comprising polypropylene, and a fourth core layer comprising LLDPE.

10. The film of claim 1 , further comprising a second core layer comprising LLDPE, a third core layer comprising polypropylene, and a fourth core layer comprising LDPE and LLDPE.

11. The film of claim 1 , wherein the polypropylene copolymer has a melt index of about 4 to about 10.

12. The film of claim 11 , wherein the polypropylene copolymer has a melt index of about 4.6.

13. A vessel comprising
a container and
a peelable multilayer film coupled to the container to form a receiving space therebetween,
wherein the peelable multilayer film comprises a seal layer comprising a polypropylene copolymer that forms a peelable seal to the container and at least one core layer comprising ethyl vinyl acetate (EVA) and polybutene-1 (PB-1) and
wherein the core layer comprising EVA and PB-1 is directly adjacent to the seal layer and
wherein the vessel further includes a skin and the peelable multilayer film is laminated to the skin to locate the peelable multilayer film between the skin and the container.

14. The vessel of claim 13 , wherein the skin is PET.

15. The vessel of claim 14 , wherein the PET is a laminate flexible film of biaxially oriented PET.

16. The vessel of claim 13 , wherein the seal layer adhesively fails or delaminates from the adjacent layer.

17. The vessel of claim 13 , wherein the peelable seal has a bond strength of about 800 g/in to about 1600 g/in.

18. The vessel of claim 13 , wherein the peelable seal has a bond strength of about 800 g/in to about 1100 g/in.

19. The vessel of claim 13 , wherein the peelable seal has a bond strength of about 1200 g/in to about 1600 g/in.

20. A vessel comprising
a container and
a peelable multilayer film coupled to the container to form a receiving space therebetween,
wherein the peelable multilayer film comprises a seal layer comprising a polypropylene copolymer that forms a peelable seal to the container and at least one core layer comprising ethyl vinyl acetate (EVA) and polybutene-1 (PB-1) and
wherein the core layer comprising EVA and PB-1 is directly adjacent to the seal layer and
wherein the seal layer adhesively fails or delaminates from the adjacent layer.

21. The vessel of claim 20 , wherein the vessel further includes a skin and the peelable multilayer film is laminated to the skin to locate the peelable multilayer film between the skin and the container and wherein the skin is PET.

Assignees

• Berry Plastics Corp

Inventors

• Gillespie Bryan

Classifications

• 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

• Y10T428/2878

  including addition polymer from unsaturated monomer · CPC title

• B32B27/08 Primary

  of synthetic resin · CPC title

• Y10T428/2848

  Three or more layers · CPC title