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US 7,922,950 B2Granted
Monolithic building element with photocatalytic material
Assignee3M Innovative Properties Company
InventorsMark T. Anderson, Rachael A. T. Gould, Jeffry L. Jacobs
Life of this patent
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Abstract
A building element may be formed from a first cementitious mixture and a second cementitious mixture containing a photocatalytic cementitious mixture. The first cementitious mixture and the photocatalytic cementitious mixture may be co-formed into a shaped uncured two layer monolith having a base layer of the first cementitious mixture and a top layer of the photocatalytic cementitious mixture. The shaped uncured two layer monolith is then cured. The resulting building element may be algae-resistant.
Claims13
A method of forming a roofing tile or siding element, comprising steps of:
- providing a first aqueous cementitious material;
- mixing a photocatalytic material into a second aqueous cementitious mixture to create a photocatalytic cementitious mixture;
- co-forming the roofing tile or siding element as a shaped uncured two layer monolith comprising a base layer of the first aqueous cementitious material and a top layer of the photocatalytic aqueous cementitious mixture;
- and
- curing the uncured two layer monolith in a kiln drying process, wherein the uncured base layer has a thickness of about 2 to about 3 centimeters and the uncured photocatalytic layer has a thickness of about 2 to 3 millimeters.
2 more elements
Dependencies are inferred from the claim text.