Manufacture of composite roofing products with matrix formulated microbiocide
OwnerMichael G. Israelinventor
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Abstract
This invention discloses improved residential roofing products with durable active protection against algae discoloration. Versatile organometallic salts and chelates for this purpose are incorporated in manufacture of composite concrete tile and asphalt shingle products via integrated process modifications. These chemically stable non-volatile microbiocides, with exceptional effectiveness against both green and blue green algae, are tailored for specific matrix compatibility. By virtue of their composition and surface activity they serve a dual function in process improvement and product performance. The control of microbiocide activity, long term, significantly advances the state-of-the-art protection against algae and the service life of these products.
Claims15
A method of protecting a composite roofing product against algae discoloration, comprising;
- (a) forming a roofing product comprising
- (b) a weatherable organic matrix and
- (c) compatible divalent metal chelates and/or salts
- wherein the weatherable organic matrix is employed as binder and/or sealer of the composite roofing product and contains 0.1 to 4.0 weight percent of the compatible divalent metal chelates and/or salts.
Dependencies are inferred from the claim text.