Asphaltic membrane with mullite-containing granules

a technology of asphaltic membrane and mullite, which is applied in the field of roofing articles, can solve the problems of lack of brightness and opacity of kaolin clay alone, and achieve the effect of reducing the amount of kaolin clay and reducing the amount of clay

US20130017368A1Inactive Publication Date: 2013-01-17FIRESTONE BUILDING PRODS
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Publication Date
2013-01-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

A roofing article comprising (i) an asphaltic substrate; and (ii) a plurality of granules disposed on a surface of the substrate, said granules including calcined kaolin that has been calcined at a temperature of at least 1000° C. and less than 1300° C.
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Description

[0001] This application is a Continuation Application of International Application Serial No. PCT / US2011 / 020044, filed on Jan. 3, 2011, which claims the benefit of U.S. Provisional Application Ser. No. 61 / 291,546, filed on Dec. 31, 2009, both of which are incorporated herein by reference.FIELD OF THE INVENTION

[0002] Embodiments of the present invention are directed toward roofing articles that carry (i.e. are coated with) mullite-containing granules.BACKGROUND OF THE INVENTION

[0003] Asphaltic roofing membranes, also known as bituminous membranes, have been employed to cover flat or low-sloped roofs. These membranes are typically installed by unrolling a roll of material on a roof surface and then heat seaming adjacent membranes together to form an impervious water barrier on the roof surface.

[0004] As part of the manufacturing process, the asphaltic roofing membranes are often coated with granular material. Among the benefits associated with the use of these granules is the ability to r...

Examples

examples

[0065]Ten samples of ceramic materials (generally aluminosilicates) were obtained and analyzed for various characteristics and properties, and they were further employed as granules on asphaltic test samples to determine their usefulness as a roofing granule. With respect to the latter, the asphaltic samples were analyzed for solar reflectance.

[0066]The chemical compositions of the various ceramic samples were analyzed by ICP-ES (inductively coupled plasma emission spectroscopy) techniques, and the results are set forth in Table 1 where values are set forth as weight percent. Samples 1, 2, and 3, were include multiple data points that represent different batches of what was believed to be the same material (e.g. 1a and 1b).

TABLE 1SampleNo.SiO2%Al2O3%Fe2CO3%TiO2%Na2O %K2O %MgO %CaO %Sum % 1a54.6844.510.130.480.020.100.030.05100.00 1b52.8646.310.160.450.030.090.040.05100.00 2a55.9941.590.550.320.061.340.120.03100.00 2b55.7741.760.520.260.061.430.160.04100.00 3a55.1041.921.090.130.071....