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Colored roofing granules with increased solar heat reflectance, solar heat-reflective shingles and process for producing same

  • US 10,316,520 B2
  • Filed: 11/24/2015
  • Issued: 06/11/2019
  • Est. Priority Date: 10/06/2003
  • Status: Active Grant
First Claim
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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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