Non-stick polymer coated aluminum foil
First Claim
Patent Images
1. A method of making a coated metal article comprising:
- applying a curable polyester-based coating composition on at least a portion of one side of a metal article to form a coated metal article including a coating; and
partially curing the coating in a first heating step by heating the coated metal article at a sufficiently high temperature to allow completion of the curing of the coated metal article in bulk without blocking.
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Abstract
A non-stick polymer coated aluminum foil and method of making it. The method of making a non-stick polymer coated aluminum foil comprising applying a curable polymer coating composition on at least a portion of one side of an aluminum foil and partially curing the coating composition to allow handling and further processing of the coated aluminum foil without blocking of the coating composition. The curing of the coating composition is completed by heating the coated aluminum foil in bulk. The polymer coating composition may include a cross-linkable polyester.
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Citations
21 Claims
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1. A method of making a coated metal article comprising:
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applying a curable polyester-based coating composition on at least a portion of one side of a metal article to form a coated metal article including a coating; and
partially curing the coating in a first heating step by heating the coated metal article at a sufficiently high temperature to allow completion of the curing of the coated metal article in bulk without blocking. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 16)
cooling the aluminum foil in coil form; and
a second heating step comprising heating the aluminum foil in coil form to a temperature and for a time sufficient to complete the curing of the coating composition.
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5. The method of claim 2, wherein said coating composition is applied on said aluminum foil in an amount of from about 0.025 lbs. to about 0.2 lbs. per 3,000 square feet.
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6. The method of claim 4, wherein said cooling of the aluminum foil in coil form is done gradually.
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7. The method of claim 2, wherein said coating composition comprises a cross-linkable polyester resin, a curing agent, and a solvent.
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8. The method of claim 2, wherein said first heating step comprises heating the aluminum foil in web form to a temperature of from about 300°
- F. to about 350°
F.
- F. to about 350°
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9. The method of claim 4, wherein said second heating step comprises heating the aluminum foil in coil form to a temperature of from about 350°
- F. to about 425°
F.
- F. to about 425°
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10. The method of claim 7, wherein said coating composition further comprises a release agent.
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15. The method of claim 10, wherein said coating composition comprises a cross-linkable polyester resin, a curing agent, and a solvent.
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16. A non-stick, polymer coated aluminum foil formed according to the method of claim 4.
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11. A method of making a non-stick, coated aluminum foil comprising:
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applying a curable polyester-based coating composition on at least a portion of one side of an aluminum foil;
partially curing the coating composition sufficiently to allow winding the aluminum foil in coil form without blocking of the coating composition; and
completing the curing of the coating composition by heating the aluminum foil in coil form. - View Dependent Claims (12, 13, 14, 17)
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18. A non-stick polymer coated metal article comprising:
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a metal article; and
a non-stick, polyester based coating bonded on at least a portion of one side of the metal article, wherein the coating is formed by;
applying a non-stick, polyester-based coating on at least a portion of one side of the metal article;
partially curing the coating in a first heating step by heating the coated metal article at a sufficiently high temperature to allow completion of the curing of the coated metal article in bulk without blocking;
gradually cooling and collecting the partially cured article in a bulk form; and
heating the metal article in bulk form to a temperature and for a time sufficient to complete the cure of the coating composition. - View Dependent Claims (19, 20, 21)
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Specification