ROOFING GRANULES WITH IMPROVED LUSTER, ROOFING PRODUCTS INCLUDING SUCH GRANULES, AND PROCESS FOR PREPARING SAME
First Claim
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1. A process for producing roofing granules having a cured coating layer, the process comprising:
- (a) providing base particles;
(b) providing a coating composition comprising an inorganic sol material and at least one organic colorant, the at least one organic colorant being selected to provide a cured coating layer having an L* of less than 20;
(c) applying the coating composition to the base particles to form a coating layer on the base particles; and
(d) curing the coating layer at a temperature less than 200 degrees Celsius.
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Abstract
A coating composition including an inorganic sol material and an organic colorant is applied to mineral particles and cured at a temperature less than 200 degrees Celsius provides roofing granules with improved luster.
103 Citations
24 Claims
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1. A process for producing roofing granules having a cured coating layer, the process comprising:
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(a) providing base particles; (b) providing a coating composition comprising an inorganic sol material and at least one organic colorant, the at least one organic colorant being selected to provide a cured coating layer having an L* of less than 20; (c) applying the coating composition to the base particles to form a coating layer on the base particles; and (d) curing the coating layer at a temperature less than 200 degrees Celsius. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification