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US 8,617,665 B2Granted
Self-cleaning substrates and methods for making the same
AssigneeAlcoa Inc.
InventorsJay A. Kahn, Grant Nintzel, Yves Biehlmann, Craig Belnap, Clinton Zediak, John Keener, James Bell, Albert L. Askin, Paula L. Kolek, Jean Ann Skiles
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Abstract
A methods, apparatus and compositions for producing colored, self-cleaning substrates by roll coating are provided. The roll coated, colored, self-cleaning substrates retain the predetermined color and a predetermined gloss of the colored coating, thereby facilitating their use in architectural applications. The roll coated, colored, self-cleaning substrates may be iridescent-free.
Claims3
A method comprising:
- (a) first producing a colored aluminum sheet product, the first producing step comprising:
- (i) first roll coating a colored coating liquid onto an aluminum alloy sheet;
- and
- (ii) first converting the colored coating liquid into a colored layer, wherein the colored layer is located on an outer surface of the aluminum alloy sheet;
- (b) second producing an intermediate aluminum sheet product, the second producing step comprising:
- (i) second roll coating an inorganic barrier coating liquid onto at least a portion of the colored layer of the colored aluminum sheet product, wherein the inorganic barrier coating liquid is in the form of an aqueous solution comprising silica;
- and
- (ii) second converting the inorganic barrier coating liquid into an inorganic barrier layer, wherein, after the second converting step, the inorganic barrier layer is located on at least a portion of the colored layer;
- and
- (c) third producing a colored self-cleaning aluminum sheet product, the third producing comprising:
- (i) third roll coating a portion of an aqueous-based self-cleaning coating precursor liquid onto at least a portion of the inorganic barrier layer of the intermediate aluminum sheet product;
- wherein, the self-cleaning coating liquid includes photocatalytically active semiconductor particles;
- (ii) third converting the aqueous-based self-cleaning coating precursor liquid into a self-cleaning layer, wherein, after the third converting step:
- (A) the self-cleaning layer is located on at least a portion of the inorganic barrier layer;
- (B) the photocatalytically active semiconductor particles are uniformly dispersed throughout the self-cleaning layer.
12 more elements
Dependencies are inferred from the claim text.