Peelable film for container lid

Patent metadata

Field	Value
Publication number	US-9555603-B2
Application number	US-201615018049-A
Country	US
Kind code	B2
Filing date	Feb 8, 2016
Priority date	Mar 15, 2013
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

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,
wherein the polypropylene copolymer has a melt index of about 4 to about 10; and
at least one core layer comprising an ethyl vinyl acetate (EVA) and polybutene-1(PB-1),
wherein the core layer comprising the EVA and PB-1 is directly adjacent to the seal layer.

2. 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.

3. 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.

4. 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.

5. The film of claim 1 wherein the polypropylene copolymer has a melt index of about 4.6.

6. The film of claim 1 , wherein the seal layer further comprises a slip agent.

7. A peelable multilayer film comprising
a seal layer comprising a polypropylene copolymer;
and
at least one core layer comprising an ethyl vinyl acetate (EVA) copolymer and polybutene-1 (PB-1),
wherein the core layer comprising the EVA copolymer and PB-1 is directly adjacent to the seal layer,
wherein the EVA copolymer is at least about 85% by weight of the core layer.

8. The film of claim 7 , wherein the EVA copolymer is about 85% to about 95% by weight of the core layer.

9. The film of claim 8 , wherein the EVA copolymer is about 85% by weight of the core layer.

10. The film of claim 8 , wherein the EVA copolymer is about 95% by weight of the core layer.

11. A peelable multilayer film comprising
a seal layer comprising a polypropylene copolymer;
and
at least one core layer comprising an ethyl vinyl acetate (EVA) copolymer and polybutene-1 (PB-1),
wherein the core layer comprising the EVA copolymer and PB-1 is directly adjacent to the seal layer,
wherein the EVA copolymer is up to 95% by weight of the core layer.

12. The film of claim 11 , wherein the EVA copolymer is about 85% to about 95% by weight of the core layer.

13. The film of claim 12 , wherein the EVA copolymer is about 85% by weight of the core layer.

14. A peelable multilayer film comprising
a seal layer comprising a polypropylene copolymer;
and
at least one core layer comprising an ethyl vinyl acetate (EVA) copolymer and polybutene-1 (PB-1),
wherein the core layer comprising the EVA copolymer and PB-1 is directly adjacent to the seal layer,
wherein the PB-1 is up to about 15% by weight of the core layer.

15. The film of claim 14 , wherein the PB-1 is up to about 5% by weight of the core layer.

16. A peelable multilayer film comprising
a seal layer comprising a polypropylene copolymer;
and
at least one core layer comprising an ethyl vinyl acetate (EVA) copolymer and polybutene-1 (PB-1),
wherein the core layer comprising the EVA copolymer and PB-1 is directly adjacent to the seal layer,
wherein the EVA copolymer comprises about 2% to about 30% by weight vinyl acetate.

17. The film of claim 16 wherein the EVA copolymer comprises about 2% to about 20% by weight vinyl acetate.

18. The film of claim 17 wherein the EVA copolymer comprises about 18% by weight vinyl acetate.

Assignees

• Berry Plastics Corp

Inventors

• Gillespie Bryan

Classifications

• B32B2250/24

  All layers being polymeric · CPC title

• B32B2270/00

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

• B65D65/40

  Applications of laminates for particular packaging purposes {(B65D1/0215, B65D1/28, B65D3/22, B65D5/0281, B65D5/563, B65D9/30, B65D29/02, B65D31/02, B65D75/26, B65D77/2024, B65D81/1275, B65D81/3811, B65D81/3823, B65D81/3834, B65D81/3846, B65D81/3858, B65D81/3874, B65D81/3886, B65D81/3897 take precedence; laminates per se or laminated packages characterised by the composition or)} · CPC title

• Y10T428/2848

  Three or more layers · CPC title

• B32B2439/00

  Containers; Receptacles · CPC title