Coating compositions for roofing granules, dark colored roofing granules with increased solar heat reflectance, solar heat-reflective shingles and process for producing the same

Patent metadata

Field	Value
Publication number	US-10214449-B2
Application number	US-201514954377-A
Country	US
Kind code	B2
Filing date	Nov 30, 2015
Priority date	Mar 31, 2008
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

Dark colored roofing granules include an inert base particle coated with a composition including a metal silicate, a non-clay latent heat reactant, and a dark colored but solar reflective pigment.

First claim

The invention claimed is:

1. A plurality of dark-colored roofing granules, each of the dark-colored roofing granules comprising:
an inert base particle; and
a cured coating disposed about the inert base particle, the cured coating being a reaction product of a coating composition comprising:
an alkali metal silicate;
at least one non-clay latent heat reactant; and
at least one inorganic solar heat-reflective pigment, each of the at least one inorganic solar heat-reflective pigments having an L* less than 30 and a solar reflectance greater than 20 percent, and wherein the coating composition comprises at least about 5 percent to 25 percent of the at least one solar heat-reflective pigment,
wherein
the plurality of dark-colored roofing granules has an L* less than 30 and a solar reflectance greater than 20, and
wherein each of the dark-colored roofing granules lacks a light-colored base coat disposed between the inert base particle and the cured coating.

2. A plurality of dark-colored roofing granules according to claim 1 , wherein in the coating composition the at least one non-clay latent heat reactant is selected from the group consisting of Portland cement, aluminum fluoride, ammonium silicofluoride, alkali metal silicofluorides, and alkaline earth metal silicofluorides.

3. A plurality of dark-colored roofing granules according to claim 1 , wherein in the coating composition the at least one non-clay latent heat reactant comprises Portland cement, aluminum fluoride and at least one alkali metal silicofluoride.

4. A plurality of dark-colored roofing granules according to claim 3 , wherein in the coating composition the at least one alkali metal silicofluoride is sodium silicofluoride.

5. A plurality of dark-colored roofing granules according to claim 3 , wherein in the coating composition wherein the at least one non-clay latent heat reactant comprise from about 3 to 15 weight percent of the coating composition of aluminum fluoride, from about 0.5 to 5 weight percent of the coating composition of sodium silicofluoride, and from about 0.5 to 5 weight percent of the coating composition of Portland cement.

6. A plurality of dark-colored roofing granules according to claim 1 , wherein in the coating composition wherein the at least one inorganic solar heat-reflective pigment is selected from the group consisting of Arctic Black 10C909 (chromium green-black), Black 411 (chromium iron oxide), Brown 12 (zinc iron chromite), Brown 8 (iron titanium brown spinel), and Yellow 193 (chrome antimony titanium), 56, Eclipse Black 10201, Forest Green 10241, Eclipse Black 10202, Eclipse Black 10203, and H IR Green V-12650.

7. A plurality of dark-colored roofing granules of claim 1 wherein in each of the dark-colored roofing granules the cured coating comprises a first layer including a first metal silicate binder and a first inorganic solar heat-reflective pigment and a second layer including a second metal silicate binder and a second inorganic solar heat-reflective pigment.

8. A plurality of dark-colored roofing granules of claim 7 wherein in each of the dark-colored roofing granules the second inorganic solar heat-reflective pigment is identical to the first inorganic solar heat-reflective pigment.

9. A plurality of dark-colored roofing granules of claim 8 wherein in each of the dark-colored roofing granules the first and second inorganic solar heat-reflective pigments are selected from the group consisting of Arctic Black 10C909 (chromium green-black), Black 411 (chromium iron oxide), Brown 12 (zinc iron chromite), Brown 8 (iron titanium brown spinel), and Yellow 193 (chrome antimony titanium), Brown 10364, Eclipse Black 10201, Forest Green 10241, Eclipse Black 10202, Eclipse Black 10203, and H IR Green V-12650.

10. A plurality of dark-colored roofing granules of claim 8 wherein in each of the dark-colored roofing granules the first coating layer comprises at least about 30 percent to about 40 percent of the first inorganic solar heat-reflective pigment, and wherein the second coating layer comprises at least about 30 percent to about 40 percent of the second inorganic solar heat-reflective pigment.

11. A plurality of dark-colored roofing granules of claim 7 wherein in each of the dark-colored roofing granules the first and second coating layers form from about 4 percent by weight of the inert base particle to about 10 percent by weight of the inert base particle.

12. A plurality of dark-colored roofing granules of claim 7 wherein each of the dark-colored roofing granules further comprises a third coating layer, the third coating layer being identical to the second coating layer and the first coating layer.

13. A plurality of dark-colored roofing granules of claim 7 wherein in each of the dark-colored roofing granules the second inorganic solar heat-reflective pigment is different from the first inorganic solar heat-reflective pigment.

14. A plurality of dark-colored roofing granules of claim 13 wherein in each of the dark-colored roofing granules the first inorganic solar heat-reflective pigment is selected from the group consisting of Arctic Black 10C909 (chromium green-black), Black 411 (chromium iron oxide), Brown 12 (zinc iron chromite), Brown 8 (iron titanium brown spinel), and Yellow 193 (chrome antimony titanium), Brown 10364, Eclipse Black 10201, Forest Green 10241, Eclipse Black 10202, Eclipse Black 10203, and H IR Green V-12650.

15. A plurality of dark-colored roofing granules of claim 13 wherein in each of the dark-colored roofing granules the second inorganic solar heat -reflective pigment is selected from the group consisting of Arctic Black 10C909 (chromium green-black), Black 411 (chromium iron oxide), Brown 12 (zinc iron chromite), Brown 8 (iron titanium brown spinel), and Yellow 193 (chrome antimony titanium), Brown 10364, Eclipse Black 10201, Forest Green 10241, Eclipse Black 10202, Eclipse Black 10203, and H IR Green V-12650.

16. A plurality of dark-colored roofing granules of claim 13 wherein in each of the dark-colored roofing granules the second layer further comprises an inorganic solar-reflective functional pigment.

17. A plurality of dark-colored roofing granules of claim 16 wherein in each of the dark-colored roofing granules the solar-reflective functional pigment is selected from the group consisting of mirrorized silica flakes, metal flake pigments, and metal oxide coated flake pigments.

18. A plurality of dark-colored roofing granules of claim 16 wherein in each of the dark-colored roofing granules the second coating layer comprises at least about 1 percent to about 60 percent of the solar-reflective functional pigment.

19. A plurality of dark-colored roofing granules of claim 16 wherein in each of the dark-colored roofing granules the second coating layer comprises at least about 1 percent to about 60 percent of the second solar heat-reflective pigment.

20. A plurality of dark-colored roofing granules of claim 1 , wherein in each of the dark-colored roofing granules the inert base particle is an inert mineral particle and the cured coating is disposed directly on the inert mineral particle.

21. A plurality of dark-colored roofing granules of claim 1 , wherein in each of the dark-colored roofing granules the coating composition further includes aluminum oxide having a particle size in the range of 0.1 to 5 micrometers.

22. A plurality of dark-colored roofing granules of claim 1 , wherein in each of the dark-colored roofing granules the coating composition

Assignees

• Certain Teed Corp

Inventors

• Kalkanoglu Husnu M
• Mcshea Thomas
• Shiao Ming Liang

Classifications

• Y10T428/2995

  Silane, siloxane or silicone coating · CPC title

• C04B14/045

  Alkali-metal containing silicates, e.g. petalite (waterglass C04B12/04) · CPC title

• C04B18/16

  from building or ceramic industry · CPC title

• Y10T428/24413

  Metal or metal compound · CPC title

• C04B14/062

  Microsilica, e.g. colloïdal silica (preparing microsilica slurries or suspensions C04B18/148) · CPC title