Metalized film laminates with anticorrosion agents

• US 7,361,391 B2
• Filed: 10/02/2002
• Issued: 04/22/2008
• Est. Priority Date: 10/02/2002
• Status: Expired due to Fees

• Current Assignee: Milprint Incorporated (Amcor Plc)
• Original Assignee: Milprint Incorporated (Amcor Plc)
• Inventors: Rassouli, Mahmood Reza, Hartman, Michael Scott
• Primary Examiner(s): KILIMAN, LESZEK B
• Application Number:
  US10/263,022
• Publication Number:
  US 20040067375A1
• Time in Patent Office: 2,029 Days
• Field of Search: 428/457, 428/478, 428/461, 428/34.6, 428/34.7, 428/35.3, 428/35.7, 428/35.8, 428/35.9, 428/36.6, 428/355.R, 428/356, 428/355.N
• US Class Current: 428/34.6
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: Y10T 428/1317 Multilayer [continuous layer]
• CPC Class Codes: Y10T 428/1321 Polymer or resin containing [i.e., natural or synthetic]
• CPC Class Codes: Y10T 428/1338 Elemental metal containing
• CPC Class Codes: Y10T 428/1352 Polymer or resin containing [i.e., natural or synthetic]
• CPC Class Codes: Y10T 428/1355 Elemental metal containing [e.g., substrate, foil, film, coating, etc.]
• CPC Class Codes: Y10T 428/1359 Three or more layers [continuous layer]
• CPC Class Codes: Y10T 428/1379 Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
• CPC Class Codes: Y10T 428/2852 Adhesive compositions
• CPC Class Codes: Y10T 428/2857 including metal or compound thereof or natural rubber
• CPC Class Codes: Y10T 428/2896 including nitrogen containing condensation polymer [e.g., polyurethane, polyisocyanate, etc.]
• CPC Class Codes: Y10T 428/31692 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31855 Of addition polymer from unsaturated monomers

Abstract

Multilayered laminate films for food packaging applications which comprise at least: (a) a layer of oriented or nonoriented polyester terephthalate or oriented or nonoriented polypropylene, (b) a layer comprising at least one metal, and (c) a layer comprising at least one additive suitable for incidental food contact which provides protection against corrosion to a layer containing at least one metal is described.

Claims

1. A film laminate comprising:

(a) a first layer comprising a polymer adhesive resin and an anticorrosion additive comprising an alkali metal salt selected from the group consisting of benzoates, sebacates and blends thereof, wherein said first layer is free of polyvinyl alcohol and polyamide;

(b) a second layer formed as a coating comprising a metal or metal oxide comprising aluminum, zinc, nickel, copper, bronze, gold, silver or alloys thereof;

wherein said second layer is in direct contact with said first layer

(c) a third layer comprising a polymer resin;

wherein said third layer is essentially free of low-molecular weight hydrocarbon resin;

wherein said first layer prevents the loss of the barrier properties of said second layer such that said laminate has a water vapor transmission rate of less than 22 gm./100 in.²/24 hours as measured in accordance with ASTM 1249 test method; and

wherein said laminate is suitable for incidental food contact.

2. A film laminate according to claim 1;

wherein said third layer comprises a polyester or polyolefin.

3. A film laminate according to claim 2;

wherein said polyester is polyester terephthalate.

4. A film laminate according to claim 2;

wherein said polyolefin is polypropylene.

5. A film laminate according to claim 1, wherein said first layer comprises an acrylic or urethane based resin.

6. A film laminate according to claim 1;

wherein said additive comprises between 0.00 5% (wt.) to 60% (wt.) of said first layer.

7. A film laminate according to claim 6;

wherein said additive comprises between 0.05% (wt.) to 5% (wt.) of said first layer.

8. A film laminate according to claim 1;

wherein said additive is suitable for incidental food contact.

9. A film laminate according to claim 1;

wherein said additive is not a chromate, amine, nitrite, or mercaptan.

10. A film laminate according to claim 1, wherein said coating is formed by a method comprising sputtering, electroplating, or vacuum vapor-deposition.

11. A film laminate according to claim 1, wherein said coating is formed on a first surface of said third layer.

12. A film laminate according to claim 1, wherein said laminate further comprises a fourth layer of a polymer resin wherein said fourth layer is essentially free of low-molecular hydrocarbon resin.

13. A film laminate according to claim 12;

wherein said resin comprises a polyester or polyolefin.

14. A film laminate according to claim 13, wherein said polyester is polyester terephthalate.

15. A film laminate according to claim 13;

wherein said polyolefin is polypropylene.

16. A film laminate according to claim 12, wherein said fourth layer is adjacent to said first layer.

17. A film laminate according to claim 16, wherein said laminate further comprises a fifth layer comprising at least one metal.

18. A film laminate according to claim 17, wherein said fifth layer is adjacent to said fourth layer.

19. A film laminate according to claim 16 or 18, wherein said fourth layer is in direct contact with a second surface of said first layer or a first surface of said fifth layer.

20. A film laminate according to claim 17, wherein said fifth layer is formed as a coating.

21. A film laminate according to claim 20, wherein said coating is formed by a method comprising electroplating, sputtering, or vacuum vapor-deposition.

22. A film laminate according to claim 20, wherein said coating is formed on a first surface of said fourth layer.

23. A film laminate comprising:

(a) a first layer comprising a polymer adhesive resin and an anticorrosion additive comprising an alkali metal salt selected from the group consisting of benzoates, sebacates and blends thereof;

wherein said first layer is free of polyvinyl alcohol and polyamide;

(b) a second layer formed as a coating comprising a metal or metal oxide comprising aluminum, zinc, nickel, copper, bronze, gold, silver or alloys thereof;

wherein said second layer is in direct contact with said first layer;

(c) a third layer comprising a polymer resin;

(d) a fourth layer comprising a polymer resin;

wherein said third layer and fourth layer are essentially free of low-molecular weight hydrocarbon resin;

wherein said first layer prevents the loss of the barrier properties of said second layer such that said laminate has a water vapor transmission rate of less than 22 gm./100 in.²/24 hours as measured in accordance with ASTM 1249 test method; and

said laminate is suitable for incidental food contact.

24. A film laminate according to claim 23;

wherein said third layer comprises a polyester or polyolefin.

25. A film laminate according to claim 24;

wherein said polyester is polyester terephthalate.

26. A film laminate according to claim 24;

wherein said polyolefin is polypropylene.

27. A film laminate according to claim 23, wherein said first layer comprises an acrylic or urethane based resin.

28. A film laminate according to claim 23;

wherein said additive comprises between 0.005% (wt.) to 60% (wt.) of said first layer.

29. A film laminate according to claim 28;

wherein said additive comprises between 0.05% (wt.) to 5% (wt.) of said first layer.

30. A film laminate according to claim 23;

wherein said additive is suitable of incidental food contact.

31. A film laminate according to claim 23;

wherein said additive is not a chromate, amine, nitrite, or mercaptan.

32. A film laminate according to claim 23, wherein said coating is formed by a method comprising electroplating, sputtering, or vacuum vapor-deposition.

33. A film laminate according to claim 23, wherein said coating is formed on a first surface of said third layer.

34. A film laminate according to claim 23, wherein said fourth layer is adjacent to said first layer.

35. A film laminate according to claim 23, wherein said laminate further comprises a fifth layer comprising at least one metal.

36. A film laminate according to claim 35, wherein said fifth layer is adjacent to said fourth layer.

37. A film laminate according to claim 34 or 36;

wherein said fourth layer is in direct contact with a second surface of said first layer or a first surface of said fifth layer.

38. A film laminate according to claim 35, wherein said fifth layer is formed as a coating.

39. A film laminate according to claim 38, wherein said coating is formed by a method comprising electroplating, sputtering, or vacuum vapor-deposition.

40. A film laminate according to claim 38, wherein said coating is formed on a first surface of said fourth layer.

41. A film laminate according to claim 38, wherein said coating comprises a metal or metal oxide comprising aluminum, zinc, nickel, copper, bronze, gold, silver or alloys thereof.

42. A film laminate comprising;

(a) a first layer comprising an acrylic or urethane resin and an anticorrosion additive wherein said first layer is free of polyvinyl alcohol and polyamide;

(b) a second layer formed as a coating comprising a metal or metal oxide comprising aluminum, zinc, nickel, copper, bronze, gold, silver or alloys thereof;

(c) a third layer comprising polyester terephthalate or polypropylene;

(d) a fourth layer comprising polyester terephthalate or polypropylene

wherein said third layer and fourth layer are essentially free of low-molecular weight hydrocarbon resin;

wherein said first layer prevents the loss of the barrier properties of said second layer such that said laminate has a water vapor transmission rate of less than 22 gm./100 in.²/24 hours as measured in accordance with ASTM 1249 test method; and

said laminate is suitable for incidental food contact.

43. A film laminate suitable for food packaging comprising:

(a) a first anticorrosion layer comprising an alkali metal salt of benzoate or sebacate;

wherein said first layer is free of polyvinyl alcohol and polyamide;

(b) a second layer formed as a coating comprising a metal or metal oxide comprising aluminum, zinc, nickel, copper, bronze, gold, silver or alloys thereof;

(c) a third layer comprising a polymer resin wherein said third layer is essentially free of low-molecular weight hydrocarbon resin; and

wherein said first layer prevents the loss of the barrier properties of said second layer such that said laminate has a water vapor transmission rate of less than 22 gm./100 in.²/24 hours as measured in accordance with ASTM 1249 test method.

44. A film laminate according to claim 43, further comprising a fourth layer of an ester or olefin wherein said third layer is essentially free of low-molecular weight hydrocarbon resin.

45. A film laminate according to claim 43, further comprising a fifth layer of at least one metal.