Granular materials having an improved ceramic coating and...

Details Granular materials having an improved ceramic coating and... Granular materials having an improved ceramic coating and...

B - Operations, Transporting

01

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B01J 13/02 (2006.01) C09D 5/16 (2006.01) E04D 5/12 (2006.01) E04D 13/00 (2006.01)

Patent

CA 2088822

A granular material which includes an inorganic substrate and a ceramic coating shows improved adhesion to bituminous surfaces, decreased alkalinity, and, when formulated as a three coated algae-resistant granule, exhibits improved algae-resistance over previously known granules. The ceramic coating comprises the reaction product of an alkali metal silicate and an aluminosilicate, the ceramic coating further including a borate compound and zinc oxide having a particle size less than 0.13 micrometer. It has been found that the use of a borate compound and zinc oxide having the stated particle size allows the granules to be adhered to a substrate for longer periods of time, thus producing a surface which retains its original color for a longer period of time. Methods of producing such ceramic-coated granular materials, and composite sheets including the granules are also presented.

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