Architectural coating compositions
OwnerKatherine Elbert, Michael W. Leonard +1inventors
InventorsKatherine Elbert, Michael W. Leonard, William J. Fabiny
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Abstract
Aqueous coating compositions for roofs desirably have both high solar reflectance and low water swelling. They contain a filler, which includes a high-reflectance inorganic pigment like titanium dioxide to provide better solar reflectance, and a binder, both emulsified in an aqueous solvent. The amount of high reflectance pigment in the filler can be reduced if the binder is an opacifying acrylic polymer (OAP) binder. Unexpectedly, coatings with the OAP binder exhibit only moderate and acceptable levels of water swelling.
Claims15
An aqueous coating composition that comprises:
- a) a water-insoluble filler that comprises from 5 weight percent to less than 20 weight percent of high-reflectance inorganic pigment;
- b) an opacifying acrylic polymers binder;
- and
- wherein the aqueous coating composition has a pigment volume content of no more than 55 percent.
A coated substrate that forms part of a roof, wherein the coated substrate.
Dependencies are inferred from the claim text.