Multiple layer plastic film having polypropylene adhered to nylon

• US 4,588,648 A
• Filed: 07/30/1984
• Issued: 05/13/1986
• Est. Priority Date: 02/20/1981
• Status: Expired due to Fees

• Current Assignee: American National Can Company
• Original Assignee: United States Gypsum Company (GEBR Knauf Verwaltungsgesellschaft KG)
• Inventors: Odorzynski, Thomas W., Krueger, Duane A.
• Primary Examiner(s): SLUBY, PATRICIA
• Application Number:
  US06/635,630
• Time in Patent Office: 652 Days
• Field of Search: 428/516, 428/476.1, 428/475.8
• US Class Current: 428/475.8
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: Y10T 428/31743 Next to addition polymer from unsaturated monomer[s]
• CPC Class Codes: Y10T 428/31746 Polymer of monoethylenically unsaturated hydrocarbon
• CPC Class Codes: Y10T 428/31913 Monoolefin polymer

Abstract

A novel coextruded plastic film has, as an adhesive layer between polypropylene and nylon layers, a blend of polypropylene and a graft copolymer of maleic anhydride onto an olefin polymer or copolymer, the adhesive blend containing from about 0.005% to 0.75% maleic anhydride based on the total weight of the entire blend composition.

Claims

1. A multiple layer plastic film, comprising:

(a) a layer of polypropylene;

(b) a layer of nylon; and

(c) a functionally adhesive layer juxtaposed between said nylon layer and said polypropylene layer, said adhesive layer being a blend consisting essentially of (i) a graft copolymer of maleic anhydride onto an olefin polymer or copolymer and (ii) an upgrafted propylene-based polymer; and

adhesive blending containing from about 0.005% to 0.75% maleic anhydride based on the total weight of the entire blend composition.

2. A plastic film as in claim 1 wherein the polypropylene layer in subparagraph (a) contains polyethylene up to about 50%.

3. A plastic film as in claim 1 and including an additional layer of ethylene vinyl alcohol copolymer affixed on one of its surfaces to said nylon, and a further layer of nylon affixed to the other surface of said ethylene vinyl alcohol copolymer.

4. A plastic film as in claim 2 and including an additional layer of ethylene vinyl alcohol copolymer affixed on one of its surfaces to said nylon, and a further layer of nylon affixed to the other surface of said ethylene vinyl alcohol copolymer.

5. A plastic film as in claim 1 wherein said ungrafted propylene-based polymer contains less than 20% ethylene moieties by weight and wherein said graft copolymer contains 0.1% to 2.5% maleic anhydride based on the total weight of the graft copolymer, said graft copolymer comprising between about 5% and 30% by weight of the blend, and said ungrafted propylene-based polymer comprising between about 70% and 95% by weight of the blend.

6. A plastic film as in claim 5 wherein the polypropylene layer in subparagraph (a) contains up to about 50% ethylene.

7. A plastic film as in claim 5 and including an additional layer of ethylene vinyl alcohol copolymer affixed on one of its surfaces to said nylon, and a further layer of nylon affixed to the other surface of said ethylene vinyl alcohol copolymer.