Roofing Granules, Roofing Products Including Such Granules, and Process for Preparing Same

Patent metadata

Field	Value
Publication number	US-2016347659-A1
Application number	US-201615223005-A
Country	US
Kind code	A1
Filing date	Jul 29, 2016
Priority date	Aug 20, 2009
Publication date	Dec 1, 2016
Grant date	—

Abstract

A coating composition including an inorganic sol material and an organic colorant is applied to mineral particles and cured at a temperature less than 200 degrees Celsius.

First claim

1 . A process for producing roofing granules, the process comprising:
(a) providing base particles selected from particles comprising stone dust, the base particles having a solar reflectance of at least 10 percent and a reflectance to ultraviolet radiation of at least 80 percent; (b) providing a sol-gel precursor material selected from tetra C 2 -C 5 alkyloxysilanes and C 1 -C 4 -alkyl-tri-C 2 -C 5 -alkyloxysilanes; (c) acidifying the sol-gel precursor material to provide an intermediate material; (d) adding base to the intermediate material to form a sol; (e) forming a coating composition including the sol and at least one organic colorant; (f) applying the coating composition to the base particles to form a coating layer on the base particles; (g) curing the coating layer at a temperature less than 200 degrees Celsius to form a gel; and (h) curing the gel to form an impervious coating layer.

2 . Roofing granules prepared according to the process of claim 1 .

3 . Bituminous roofing materials including roofing granules according to claim 2 .

4 . A process for producing roofing granules, the process comprising:
(a) providing base particles; (b) providing a first coating composition comprising an inorganic sol material and at least one first organic colorant; (c) applying the first coating composition to the base particles to form a first coating layer on the base particles; (d) curing the first coating layer at a temperature less than 200 degrees Celsius (e) providing a second coating composition comprising an inorganic sol material and at least one second organic colorant; (f) applying the second coating composition to the base particle having a first coating layer on the base particles; and (g) curing the second coating layer at a temperature less than 200 degrees Celsius.

5 . Roofing granules prepared according to the process of claim 4 .

6 . Bituminous roofing materials including roofing granules according to claim 5 .

7 . A roofing granule comprising:
(a) a base particle; and (b) a first coating layer comprising an inorganic sol gel coating composition including at least one organic pigment.

8 . The roofing granule according to claim 7 wherein the granule further comprises a second coating layer disposed on the base particle, the second coating layer being disposed on the first coating layer.

9 . Bituminous roofing materials including roofing granules according to claim 7 .

10 . Bituminous roofing materials including roofing granules according to claim 8 .

Assignees

• Certain Teed Corp

Inventors

• Shiao Ming Liang
• Nguyen Van Nhan
• Garre Emmanuel
• Zhou Sean X

Classifications

• E04D2001/005

  the roofing elements having a granulated surface · CPC title

• C04B26/26

  Bituminous materials, e.g. tar, pitch {(C08L95/00 takes precedence)} · CPC title

• C23C18/1225

  Deposition of multilayers of inorganic material · CPC title

• Y10T428/2991

  Coated · CPC title

• B05D1/02

  performed by spraying · CPC title