Multiple layer packaging films and packages formed thereof

• US 4,910,085 A
• Filed: 10/11/1988
• Issued: 03/20/1990
• Est. Priority Date: 11/29/1985
• Status: Expired due to Term

• Current Assignee: Pechiney Plastic Packaging Incorporated (Rio Tinto Limited)
• Original Assignee: American National Can Company (Ball Corporation), Kendall Mcgraw Laboratories Incorporated
• Inventors: Smith, Steven L., Raniere, Jean E., Gehrke, Russell P., Johnson, Richard E. Jr.
• Primary Examiner(s): Buffalow, Edith
• Application Number:
  US07/255,217
• Time in Patent Office: 525 Days
• Field of Search: 428/412, 428/483, 428/476.3, 428/476.9
• US Class Current: 428/412
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: C08L 2666/24 Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof
• CPC Class Codes: C09J 123/10 Homopolymers or copolymers of propene
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/3175 Next to addition polymer from unsaturated monomer[s]
• CPC Class Codes: Y10T 428/31757 Polymer of monoethylenically unsaturated hydrocarbon
• CPC Class Codes: Y10T 428/31797 Next to addition polymer from unsaturated monomers

Abstract

The invention discloses a multiple layer film useful in packaging, and the packages made therefrom. A first layer of the film is a material containing an ester group, a polycarbonate or a polyether block amide copolymer. A second layer of the film is a sealant, preferably polypropylene polymer blended with an elastomeric styrene ethylene butylene styrene copolymer. A third functionally adhesive layer is between the first and second layers. The composition of the third adhesive layer is typically either a polypropylene modified with a carboxy group such as an organic acid or anhydride or a styrene ethylene butylene styrene copolymer.

Claims

1. A multiple layer film, comprising:

(a) a first layer, the composition of said first layer being selected from the group consisting of polyesters, copolyesters, polycarbonates, and polyether block amide copolymers;

(b) a second sealant layer comprising (i) a first component of a polypropylene and (ii) a second component of a styrene ethylene butylene styrene copolymer; and

(c) a third adhesive layer adhering said first layer to said second layer, said third layer being positioned between said first and second layers, and in surface-to-surface contact with said first layer, the composition of said third adhesive layer comprising a carboxy modified propylene.

4. A multiple layer film as in claim 1 wherein the composition of said second sealant layer comprises a combination of about 40% by weight to about 90% by weight of said polypropylene and about 60% by weight to about 10% by weight of said styrene ethylene butylene styrene copolymer.

5. A package made from a multiple layer film of claim 1.

8. A package made from a multiple layer film of claim 4.

9. A package as in claim 5, said package having been subjected to processing conditions of about 250°

F. for a period of at least about 10 minutes.

12. A package as in claim 8, said package having been subjected to processing conditions of about 250°

F. for a period of at least about 10 minutes.

2. A multiple layer film comprising:

(a) a first layer, the composition of said first layer being selected from the group consisting of polyesters and copolyesters;

(b) a second sealant layer; and

(c) a third adhesive layer adhering said first layer to said second layer, said third layer being positioned between said first and second layers, and in surface-to-surface contact with said first layer, the composition of said third adhesive layer comprising a carboxy modified polypropylene.

3. A multiple layer film as in claim 2 wherein said first layer comprises a glycol modified cyclohexanedimethanolcyclohexanedicarboxylate, a copolyester.

6. A package made from a multiple layer film of claim 2.

7. A package made from a multiple layer film of claim 3.

10. A package as in claim 6, said package having been subjected to processing conditions of about 250°

F. for a period of at least about 10 minutes.

11. A package as in claim 7, said package having been subjected to processing conditions of about 250°

F. for a period of at least about 10 minutes.

13. A package as in any one of claims 5, 6, 7, 8, 9, 10, 11, or 12 wherein said package is adapted to contain medical products including liquids and powders.