Colored roofing granules with increased solar heat reflectance, solar heat-reflective shingles and process for producing same
First Claim
Patent Images
1. A roofing product comprising:
- a mixture of conventional roofing granules; and
colored infrared reflective roofing granules, the colored infrared reflective roofing granules having a solar heat reflectance of at least about 25%, having a L* of less than 55, and being selected from the group consisting of;
(a) granules comprising base particles comprising inert mineral particles coated with a cured first coating composition including a base particle binder and at least one colorant selected from the group consisting of uv-stabilized dyes and granule coloring pigments, the base particles being coated with a cured second coating composition comprising a coating binder and at least one infrared-reflective functional pigment;
(b) granules comprising base particles comprising inert mineral particles coated with a cured first coating composition including a base particle binder and at least one reflective white pigment, the base particles being coated with a cured second coating composition including a coating binder, and at least one colorant selected from the group consisting of pigments with near infrared transparency;
(c) granules comprising inert base particles with size passing #8 mesh and retaining on #70 mesh coated with a cured coating composition comprising a coating binder and at least one colored, infrared-reflective pigment;
(d) granules comprising base particles comprising inert mineral particles coated with a cured first coating composition including a base particle binder and at least one reflective white pigment, the base particles being coated with a cured second coating composition including a coating binder, and at least one colorant selected from the group consisting of uv-stabilized dyes and granule coloring pigments;
(e) combinations thereof.
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Abstract
Solar-reflective roofing granules having deep-tone colors are formed by coating base mineral particles with a coating composition including an infrared-reflective pigment. Color is provided by a colored infrared pigment, a light-interference platelet pigment, or a metal oxide.
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Citations
19 Claims
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1. A roofing product comprising:
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a mixture of conventional roofing granules; and colored infrared reflective roofing granules, the colored infrared reflective roofing granules having a solar heat reflectance of at least about 25%, having a L* of less than 55, and being selected from the group consisting of; (a) granules comprising base particles comprising inert mineral particles coated with a cured first coating composition including a base particle binder and at least one colorant selected from the group consisting of uv-stabilized dyes and granule coloring pigments, the base particles being coated with a cured second coating composition comprising a coating binder and at least one infrared-reflective functional pigment; (b) granules comprising base particles comprising inert mineral particles coated with a cured first coating composition including a base particle binder and at least one reflective white pigment, the base particles being coated with a cured second coating composition including a coating binder, and at least one colorant selected from the group consisting of pigments with near infrared transparency; (c) granules comprising inert base particles with size passing #8 mesh and retaining on #70 mesh coated with a cured coating composition comprising a coating binder and at least one colored, infrared-reflective pigment; (d) granules comprising base particles comprising inert mineral particles coated with a cured first coating composition including a base particle binder and at least one reflective white pigment, the base particles being coated with a cured second coating composition including a coating binder, and at least one colorant selected from the group consisting of uv-stabilized dyes and granule coloring pigments; (e) combinations thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification