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

1. A roofing product comprising colored infrared reflective roofing granules selected from the group consisting of

(a) granules comprising base particles comprising inert mineral particles coated with a cured first coating composition comprising 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 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 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;

(e) 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;

(f) granules 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 to form base particles, the base particles being coated with a cured second coating composition including a coating binder and 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; and

(g) combinations thereof.

2. A roofing product according to claim 1 , wherein the roofing product comprises a shingle.

3. A roofing product according to claim 1 , wherein the roofing product comprises a roll good.

4. A roofing product according to claim 1 , wherein the roofing product comprises a membrane.

5. A roofing product according to claim 1 , wherein the roofing product comprises a bituminous roofing product.

6. A roofing product according to claim 1 , wherein the roofing product comprises a bituminous coating material.

7. A roofing product according to claim 1 , wherein the roofing granules are adhered to a shingle stock material.

8. A roofing product according to claim 1 , wherein the roofing product has an L* of less than 55.

9. A roofing product according to claim 1 , wherein the roofing product has a solar reflectance great than 25%.

10. A process for preparing a roofing product, the process comprising:

(a) providing colored infrared reflective roofing granules selected from the group consisting of:

(1) granules comprising case particles comprising inert mineral particles coated with a cured first coating composition comprising 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;

(2) 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;

(3) granules comprising inert base particles with size passing #8 mesh and retaining on #70 mesh coated with a cured coating composition, a coating binder and at least one colored, infrared-reflective pigment;

(4) granules comprising 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 wherein the base parti9cles comprise mineral particles coated with a cured base coating composition including a base particle binder, and at least one reflective white pigment;

(5) 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;

(6) granules comprising inert mineral particles coated with a cured firs 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 to form base particles, the base particles being coated with a cured second coating composition including a coating binder and 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; and

(7) combinations thereof; and

(b) adhering the granules to a shingle stock material.

11. A process according to claim 10 , wherein the step of providing colored infrared roofing granules comprises:

(a) coating colored roofing granules with a coating composition including a coating binder and 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; and

(b) curing the coating binder to provide the colored infrared reflective roofing granules.

12. A process according to claim 1 , wherein the roofing product comprises a shingle.

13. A process according to claim 10 , wherein the roofing product comprises a roll good.

14. A process according to claim 10 , wherein the roofing product comprises a membrane.

15. A process according to claim 10 , wherein the shingle stock material comprises a bituminous roofing product.

16. A process according to claim 10 , wherein the shingle stock material comprises a bituminous coating material.

17. A process according to claim 10 , wherein the roofing product has an L* of less than 55.

18. A process according to claim 11 , wherein the roofing product has a solar reflectance great than 25%.

19. A process according to claim 10 , wherein the roofing product has a solar reflectance greater than 25%.

20. A process according to claim 19 , wherein the roofing product has an L* of less than 55.