Fade resistant black coating for roofing granules

C - Chemistry – Metallurgy – 09 – C

Patent

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Details

C09C 3/06 (2006.01) C09C 1/48 (2006.01) C09D 1/02 (2006.01) E04D 5/12 (2006.01) E04D 7/00 (2006.01)

Patent

CA 2349319

A composition, containing carbon black pigment particles of a specific size and an inorganic binder, suitable for use as a color coating on inorganic substrates to provide a greater resistance to fade than conventional coating compositions. The particles have a mean particle size in the range of about 150 nm to about 500 nm and a surface area per weight of particles of about 20 m2/g or less. The composition is useful in producing coated inorganic granules for specific uses, such as roofing granules.

L'invention se rapporte à une composition contenant des particules de pigments à base de noir de carbone, dotées d'une taille spécifique, et un liant inorganique. Ladite composition est conçue pour servir d'enrobage coloré, disposé sur des substrats inorganiques de façon à conférer à ceux-ci une résistance à la lumière supérieure à celle obtenue avec les compositions d'enrobage classiques. Ces particules ont un calibre moyen compris approximativement entre 150 nm et 500 nm et une aire superficielle par poids de particules inférieure ou égale à 20 m<2>/g environ. Cette composition permet de fabriquer des granules inorganiques enrobés destinés à des utilisations particulières, telles que des granules pour toiture.

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