Lamination adhesion of foil to thermoplastic polymers
View Patent ↗Disclosed is a multilayer structure, which comprises or is produced from a foil laminated to thermoplastic compositions using ethylene/butyl acrylate copolymer compositions as a tie layer. The multilayer structures can be useful as packaging films and industrial films. Also disclosed is a lamination process for producing the structure. Further disclosed are packages comprising the structures.
1. A multilayer structure comprising or produced from at least one layer comprising foil; at least one layer of an ethylene/butyl acrylate copolymer composition; at least one layer of a thermoplastic polyolefin composition; and optionally at least one additional layer comprising or produced from paper, polyester, polyamide, ethylene vinyl alcohol, polyethylene vinyl acetate, ethylene/acrylic acid copolymer or an ionomer thereof, polyvinylidene chloride, anhydride-modified ethylene polymer, or combinations of two or more thereof wherein the foil is a metal foil and the layer of the ethylene/butyl acrylate copolymer composition is laminated to and in contact with both the layer comprising foil and the layer of the thermoplastic polyolefin composition.
2. The multilayer structure of claim 1 wherein said foil is aluminum foil.
3. The multilayer structure of claim 1 wherein said ethylene/butyl acrylate copolymer composition comprises from about 1 to about 30 weight % of a polyolefin.
4. The multilayer structure of claim 2 wherein said ethylene/butyl acrylate copolymer composition comprises from about 10 to about 20 weight % of a polyolefin.
5. The multilayer structure of claim 3 wherein said polyolefin is polyethylene, polypropylene, or both.
6. The multilayer structure of claim 4 wherein said polyolefin is polyethylene, polypropylene, or both.
7. The multilayer structure of claim 1 further comprising the at least one additional layer.
8. The multilayer structure of claim 2 further comprising the at least one additional layer.
9. The multilayer structure of claim 3 further comprising the at least one additional layer.
10. The multilayer structure of claim 4 further comprising the at least one additional layer.
11. The multilayer structure of claim 5 further comprising the at least one additional layer.
12. The multilayer structure of claim 6 further comprising the at least one additional layer.
13. The multilayer structure of claim 1 , 2 , 3 , 4 , 9 , 10 , 11 , or 12 wherein the ethylene/butyl acrylate copolymer is prepared in a tubular reactor and the multilayer structure is co-extruded multilayer structure.
14. A package comprising a multilayer structure as recited in claim 1 , 2 , 3 , 4 , 9 , 10 , 11 , or 12 .
15. A package comprising a multilayer structure as recited in claim 13 .
16. The package of claim 14 that is formed into a pouch.
17. The package of claim 15 that is formed into a pouch.
18. A process comprising extruding an ethylene/butyl acrylate copolymer composition between a layer of foil and a layer of a thermoplastic polyolefin composition whereby a multilayer structure as recited in claim 1 , 2 , 3 , 4 , 9 , 10 , 11 , or 12 is produced.
19. A process comprising extruding an ethylene/butyl acrylate copolymer composition between a layer of foil and a layer of a thermoplastic polyolefin composition whereby a multilayer structure as recited in claim 13 is produced.