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

• US 9,200,451 B2
• Filed: 11/27/2013
• Issued: 12/01/2015
• Est. Priority Date: 10/06/2003
• Status: Active Grant

• Current Assignee: Certainteed, LLC (Compagnie de Saint-Gobain SA)
• Original Assignee: CertainTeed Corp. (Compagnie De Saint-Gobain)
• Inventors: Hong, Keith C., Shiao, Ming Liang, Kalkanoglu, Husnu M.
• Primary Examiner(s): KILIMAN, LESZEK B
• Application Number:
  US14/091,691
• Publication Number:
  US 20140120316A1
• Time in Patent Office: 734 Days
• Field of Search: 428402-407, 428/323, 106/493, 252/587
• US Class Current: 1/1
• CPC Class Codes: C01P 2006/62 L* (lightness axis)
• CPC Class Codes: E04D 1/00 Roof covering by making use of tiles, slates, shingles, or other small roofing elements roofing supports or underlayers E04D12/00
• CPC Class Codes: E04D 1/26 Strip-shaped roofing elements simulating a repetitive pattern, e.g. appearing as a row of shingles
• CPC Class Codes: E04D 2001/005 the roofing elements having a granulated surface
• CPC Class Codes: E04D 5/12 specially modified, e.g. perforated, with granulated surface, with attached pads
• CPC Class Codes: Y02A 30/254 Roof garden systems; Roof coverings with high solar reflectance
• CPC Class Codes: Y02B 80/00 Architectural or constructional elements improving the thermal performance of buildings
• CPC Class Codes: Y10T 428/2438 Coated
• CPC Class Codes: Y10T 428/24388 Silicon containing coating
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/2982 Particulate matter [e.g., sphere, flake, etc.]
• CPC Class Codes: Y10T 428/2991 Coated
• CPC Class Codes: Y10T 428/2993 Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
• CPC Class Codes: Y10T 428/2995 Silane, siloxane or silicone coating
• CPC Class Codes: Y10T 428/2996 Glass particles or spheres
• CPC Class Codes: Y10T 428/2998 including synthetic resin or polymer

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.

Claims

1. Colored infrared-reflective roofing granules comprising inert base particles coated with a cured coating composition comprising a coating binder and at least one colored, infrared-reflective pigment.

2. Colored infrared-reflective roofing granules according to claim 1 wherein the based particles have a size passing #8 mesh.

3. Colored infrared-reflective roofing granules according to claim 1 wherein the based particles have a size retained on #70 mesh.

4. Colored infrared-reflective roofing granules according to claim 1, the colored infrared-reflective roofing granules having an L* value of less than 55.

5. Colored infrared-reflective roofing granules according to claim 1 the colored infrared-reflective roofing granules having an infrared reflectance of at least 25%.

6. Colored infrared-reflective roofing granules according to claim 1 wherein the coating composition further comprises at least one infrared-reflective functional pigment selected from the group consisting of light-interference platelet pigments including mica, light-interference platelet pigments including titanium dioxide, mirrorized silica pigments based upon metal-doped silica, and alumina.

7. Colored infrared-reflective roofing granules according to claim 1 wherein the coating composition further comprises at least one coloring material selected from the group consisting of granule coloring pigments and uv-stabilized dyes.

8. Colored infrared-reflective roofing granules comprising base particles coated with a cured coating composition comprising a coating binder and at least one colored, infrared-reflective pigment wherein the base particles comprise mineral particles coated with a cured base coating composition including a base particle binder, and at least one reflective white pigment.

9. Colored infrared-reflective roofing granules according to claim 8 wherein the based particles have a size passing #8 mesh.

10. Colored infrared-reflective roofing granules according to claim 8 wherein the based particles have a size retained on #70 mesh.

11. Colored infrared-reflective roofing granules according to claim 8 wherein the at least one reflective white pigment is selected from the group consisting of titanium dioxide, zinc oxide and zinc sulfide.

12. A bituminous roofing product comprising a substrate sheet of a fibrous material saturated with a bituminous coating material and colored, infrared-reflective roofing granules comprising base particles coated with a cured coating composition comprising a coating binder and at least one colored, infrared-reflective pigment.

13. A bituminous roofing product according to claim 12 wherein the base particles have a size passing #8 mesh.

14. A bituminous roofing product according to claim 12 wherein the base particles have a size retained on #70 mesh.

15. A bituminous roofing product according to claim 12 having an L* value of less than 55.

16. A bituminous roofing product according to claim 12 having an infrared reflectance of at least 25%.

17. A bituminous roofing product according to claim 12 wherein the coating composition further comprises at least one infrared-reflective functional pigment selected from the group consisting of light-interference platelet pigments including mica, light-interference platelet pigments including titanium dioxide, mirrorized silica pigments based upon metal-doped silica, and alumina.

18. A bituminous roofing product according to claim 12 wherein the base particles comprise mineral particles coated with a cured base coating composition including a base coating binder and at least one reflective white pigment.

19. A bituminous roofing product according to claim 12 wherein the at least one reflective white pigment is selected from the group consisting of titanium dioxide, zinc oxide and zinc sulfide.