Rare earth sulphide composition with improved chemical...

C - Chemistry – Metallurgy – 01 – F

Patent

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C01F 17/00 (2006.01) C08K 3/30 (2006.01) C08K 9/02 (2006.01) C09C 1/00 (2006.01) C09C 3/06 (2006.01) C09D 7/12 (2006.01)

Patent

CA 2404578

The invention concerns a composition based on a rare earth sulphide with improved chemical stability, its preparation method and its use as colouring pigment. The inventive composition is characterised in that it contains a rare earth sulphide support and a layer based on at least said rare earth sulphide salt, a hydroxide, an oxide of said rare earth or an oxy and/or hydroxy derivative thereof, the salt, the hydroxide, the oxide and the derivative being insoluble in water and/or in alcohols. Said composition is obtained by acid attack of said support surface optionally followed by neutralisation.

La présente invention concerne une composition à base d'un sulfure de terre rare à stabilité chimique améliorée, son procédé de préparation et son utilisation comme pigment colorant. La composition de l'invention est caractérisée en ce qu'elle contient un support à base d'un sulfure de terre rare et une couche à base d'au moins un sel de la terre rare du sulfure précité, d'un hydroxyde, d'un oxyde de cette terre rare ou d'un dérivé oxy et/ou hydroxy de ceux-ci, le sel, l'hydroxyde, l'oxyde et le dérivé étant insolubles dans l'eau et/ou dans les alcools. Cette composition est obtenue par une attaque acide de la surface du support précité éventuellement suivie d'une neutralisation.

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