Method of making a food or beverage container
AssigneeAluminum Company of America
InventorsKarl Wefers, Gary A. Nitowski, Larry F. Wieserman
Life of this patent
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Abstract
Disclosed is a food or beverage container or container panel comprised of an aluminum alloy body having an integral bottom and wall. An intermediate layer comprised of an aluminum oxide or aluminum hydroxide layer is bonded to the aluminum alloy body and a functionalized layer of an organo phosphonate, organo phosphinate or phosphate ester is bonded to the oxide or hydroxide layer. A polymer layer is bonded to the functionalized layer. The functionalized layer is comprised of the reaction product of phosphonic or phosphinic acid and/or phosphonic acid ester, for example.
Claims56
A method of fabricating a food or beverage container or container panel comprising the steps of:
- (a) providing a body of aluminum base alloy;
- (b) working said body to a sheet product;
- (c) providing a coating of at least one of aluminum oxide and aluminum hydroxide thereon;
- (d) thereafter, treating said coating with an organic phosphorus-containing compound to chemically bond a functionalized layer of said organic phosphorus-containing compound on said coating;
- (e) applying a polymer coating on said functionalized layer to provide a coated sheet product;
- and
- (f) forming said coated sheet product into food or beverage containers or container panels.
The method in accordance with claim 50 wherein the pH is in the range of 7 to 10.
A method of fabricating food or beverage containers or container panels comprising the steps of:
- (a) providing a body of aluminum base alloy;
- (b) working said body to a sheet product;
- (c) subjecting the sheet product to a treatment in an aqueous solution containing triethylamine at a temperature in the range of room temperature to 100.degree. C. and having a pH in the range of 8 to 10 to form a layer of aluminum hydroxide on said substrate;
- (d) thereafter treating said sheet product with a phosphorus-containing acid selected from phosphinic acid, phosphonic acid and phosphoric acid ester having a concentration of 0.1 to 2 molar to form a functionalized layer on said aluminum hydroxide layer, the functionalized layer comprised of the reaction product of said acid and the layer of aluminum hydroxide and having a thickness of less than 200.ANG.;
- (e) applying a polymer coating on said functionalized layer to provide a coated sheet product;
- and
- (f) cutting blanks from said coated sheet product;
- and
- (g) forming said blanks into food or beverage containers or container panels.
A method of fabricating food or beverage containers or container panels comprising the steps of:
- (a) providing a body of aluminum base alloy;
- (b) working said body to a sheet product;
- (c) anodizing said sheet product in an acid having an organic phosphorus-containing compound to form an aluminum oxide layer and a functionalized layer on the sheet product;
- (d) applying a polymer coating on said functionalized layer to provide a coated sheet product;
- and
- (e) forming said coated sheet product into food or beverage containers or container panels.
A method of fabricating food or beverage containers or container panels comprising the steps of:
- (a) providing a body of aluminum base alloy;
- (b) working said body to a sheet product;
- (c) providing an aluminum substrate as an anode in an anodizing electrolyte comprised of a water containing solution having a phosphorus-containing organic compound selected from the group consisting of phosphinic acids, phosphonic acids and phosphoric acid esters;
- (d) anodizing said substrate under conditions to form an oxide layer having a thickness of 100 to 5000.ANG. on said aluminum substrate and a functionalized layer on a surface of said barrier layer, the functionalized layer having a thickness of less than 200.ANG., the oxide and functionalized layer having a phosphorus to aluminum ratio of 0.001 to 0.5;
- (e) applying a polymer coating on said functionalized layer to provide a coated sheet product;
- and
- (f) forming said coated sheet product into food or beverage containers or container panels.
In the method of producing a food or beverage container or container panel wherein an aluminum alloy is formed to produce said container or container panel from a sheet product of said alloy, the improvement comprising:
- (a) providing a coating of at least one of aluminum oxide and aluminum hydroxide on the sheet product;
- (b) thereafter, treating said coating with an organic phosphorus-containing compound to chemically bond a functionalized layer of said organic phosphorus-containing compound on said coating;
- (c) applying a polymer coating on said functionalized layer to provide a coated sheet product;
- and
- (d) forming said coated sheet product into food or beverage containers or container panels.
In the method of producing a food or beverage container or container panel wherein an aluminum alloy is formed to produce a lid for said container from a sheet product of said alloy, the improvement comprising:
- (a) providing a coating of at least one of aluminum oxide and aluminum hydroxide on the sheet product;
- (b) thereafter, treating said coating with an organic phosphorus-containing compound to chemically bond a functionalized layer of said organic phosphorus-containing compound on said coating;
- (c) applying a polymer coating on said functionalized layer to provide a coated sheet product;
- and
- (d) forming said coated sheet product into a lid for said container.
Dependencies are inferred from the claim text.