Granted Patent B2

US 8,808,844 · App. 13/115,176 · Granted Aug 19, 2014

Abstract

Claims (32)

1. An article, comprising: a metal sheet, and a biaxially oriented polymeric film heat-bonded to at least one major surface of the metal sheet, wherein the polymeric film comprises; a first layer adjacent the metal sheet comprising a mixture of one or more crystalline polyester resins and one or more amorphous polyester resins, wherein the one or more amorphous polyester reins is present within the first layer at a level of at least 25 weight percent, based on the weight of all the ingredients in the first layer; and a second layer comprising a majority by weight of one or more crystallizable polyester-based polymers.

2. The article of claim 1 , wherein the film has either had a liquid wax coating applied thereto or comprises a third surface layer that includes a polyester having one or more wax materials blended therein.

3. The article of claim 1 , wherein the polymeric film is used on a container closure and the film is firmly adhered on one side to the metal sheet and on the other side to a gasket material.

4. The article of claim 1 , wherein the film has a glass transition temperature of at least 55° C. and a melting point of at least 220° C.

5. The article of claim 1 , wherein the amorphous polyester comprises a copolyester based on esters of terephthalic acid and a blend of at least two different diols, wherein at least one of diols is known to reduce the crystallizability of terephthalic acid based polyesters.

6. The article of claim 1 , wherein the amorphous polymer is an ester of terephthalic acid and one or more diols, wherein at least one diol comprises cyclohexane dimethanol and the cyclohexane dimethanol is present at a level of from 5 to 75% of the total moles of the diol blend.

7. The article of claim 1 , wherein at least one of the first or second layers includes a plurality of metal flakes having an average aspect ratio in a range of 1.5:1 to 100:1.

8. The article of claim 1 , wherein the first and second layers are in direct contact with each other.

9. The article of claim 1 , wherein the polymeric film further comprises an oxygen-scavenging material, and wherein at least one of the first or second layers includes one or more metal catalysts in an amount of at least 6 parts per million (ppm) by weight metal.

10. The article of claim 9 , wherein the oxygen-scavenging material comprises one or more oxygen-scavenging polyamide materials.

11. The article of claim 9 , wherein the second layer includes a catalyst and at least about 5 weight percent of an oxygen-scavenging polyamide that is a reaction product of ingredients including m-xylylenediamine and a polycarboxylic acid.

12. The article of claim 9 , wherein the oxygen-scavenging material comprises a catalyst and one or more polyester-based oligomers or polymers including an oxygen-scavenging group having an aliphatic or cycloaliphatic carbon-carbon double bond.

13. A food or beverage container, or a portion thereof, formed from the article of claim 1 .

14. The food or beverage container of claim 13 , wherein the food or beverage container, or a portion thereof, comprises an easy open can end.

15. The article of claim 1 , wherein the first layer includes from 40 to 90 weight percent of the one or more amorphous polyester resins.

16. The article of claim 1 , wherein the first layer includes from 50 to 80 weight percent of the one or more amorphous polyester resins.

17. The article of claim 7 , wherein the metal flakes comprise aluminum flakes in a non-volatile carrier, wherein the aluminum metal flakes have an aspect ratio of from about 20:1 to about 80:1 and an average diameter in the range of about 0.1 microns to about 20 microns.

18. The article of claim 7 , wherein the metal flakes comprise leafing aluminum flakes.

19. The article of claim 1 , wherein the thickness of the first layer is in the range of about 5 to about 40% of the overall film thickness, the thickness of the second layer is in the range of about 20 to 95% of the overall film thickness, and the thickness of a optional surface layer, if present, is up to about 40% of the film overall thickness.

20. The article of claim 2 , wherein the film has had a liquid wax coating applied thereto, the wax coating comprising an aqueous dispersion of a wax comprising carnauba, candelilla, lanolin, lanocerin, or mixtures thereof.

21. The article of claim 1 , wherein the film has a final thickness in the range of 0.3 to 1.25 mils.

22. The article of claim 13 , wherein the food or beverage container or portion thereof comprises a metal food or beverage can, and wherein the film is present as a coating on the interior of the food or beverage can.

23. The article of claim 22 , wherein the amorphous polymer is an ester of terephthalic acid and one or more diols, wherein at least one diol comprises cyclohexane dimethanol and the cyclohexane dimethanol is present at a level of from 20 to 40% of the total moles of the diol blend.

24. The article of claim 22 , wherein the food or beverage can comprises a drawn can.

25. The article of claim 24 , wherein the drawn can is a deep drawn can.

26. The article of claim 24 , wherein the thickness of the film is from about 15 to 50 microns.

27. The article of claim 22 , wherein at least one of the first or second layers includes a plurality of metal flakes having an average diameter in the range of about 0.1 to about 20 microns.

28. The article of claim 27 , wherein the metal flakes have an average aspect ratio in a range of 1.5:1 to 100:1.

29. The article of claim 27 , wherein the metal flakes comprise leafing aluminum flakes.

30. The article of claim 22 , wherein the ratio in thickness of the second layer to first layer is in the range of 1/0.05 to 1/5.

31. The article of claim 22 , wherein the ratio in thickness of the second layer to first layer is in the range of 1/0.4 to 1/2.5.

32. The article of claim 1 , wherein the films exhibit feathering below 0.1 inches.

Assignments (9)