Titanium-containing pearlescent pigments

C - Chemistry – Metallurgy – 09 – C

Patent

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Details

C09C 1/36 (2006.01) C09C 1/00 (2006.01) C09D 5/36 (2006.01) C09D 7/12 (2006.01) C09D 11/02 (2006.01)

Patent

CA 2226510

Single or multi-coat titanium-containing nacreous pigments consisting of iron titanate and possibly titanium and/or iron oxide, obtainable by solidifying an aqueous solution of a thermally hydrolysable titanium compound on an endless belt, removing the layer formed, coating the titanium dioxide platelets after or without intermediate drying in the wet process with iron oxide, drying and calcining the material obtained in an oxidising or reducing gas atmosphere at at least 500 ~C, in which the thicknesses of the titanium dioxide and iron oxide layers are adjusted in such a way that either the stoichiometric ratio between iron oxide and titanium dioxide needed for pseudo-brookite or ilmenite formation is obtained or there in an excess of iron oxide or titanium dioxide.

L'invention concerne des pigments mono ou multicouches, à lustre nacré renfermant du titane, constitués de titanate de fer, et le cas échéant de dioxyde de titane et/ou d'oxyde de fer, pouvant être obtenus par solidification d'une solution aqueuse d'un composé de titane hydrolysable thermiquement sur une bande sans fin, par séparation de la couche obtenue, enduction des plaquettes de dioxyde de titane obtenues, après ou sans séchage intermédiaire selon un procédé par voie humide, avec de l'oxyde de fer, séchage et calcination du matériau obtenu dans une atmosphère gazeuse oxydante ou réductrice à une température d'au moins 500 DEG C. Les épaisseurs des couches de dioxyde de titane et d'oxyde de fer sont ajustées de façon à obtenir soit le rapport stoechiométrique entre l'oxyde de fer ou le dioxyde de titane, requis pour la formation de pseudobrookite ou d'ilménite, soit un excédent de dioxyde de fer ou de dioxyde de titane.

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