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US 4,359,505 AGranted
Light colored roofing granules
AssigneeGAF Corporation
InventorIngo B. Joedicke
Life of this patent
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Abstract
Roofing granules coated with insolubilized reaction product of a coating composition comprising water, kaolin clay, sodium silicate, titanium dioxide and ammonium nitrate or nitrate of one or more group 1A metals.
Claims10
Aqueous coating composition suitable for coating roofing granules and comprising:
- (a) water;
- (b) kaolin clay;
- (c) sodium silicate;
- (d) titanium dioxide;
- and
- (e) bleaching agent selected from the group consisting of ammonium nitrate or nitrate of one or more group 1A metal, said bleaching agent being present in amounts between about 1 and about 4 wt. % based on the amount of kaolin clay in the coating composition.
3 more elements
Dependencies are inferred from the claim text.