C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
C01F 17/00 (2006.01) C04B 14/36 (2006.01) C08K 3/30 (2006.01) C09C 1/00 (2006.01) C09C 3/06 (2006.01) C09D 7/12 (2006.01)
Patent
CA 2272459
The invention concerns the use of a beta rare earth sulphide as colouring pigment and its method of preparation. A beta rare earth sulphide is used, the rare earth being lanthanum, cerium, praseodymium, samarium or neodymium. The sulphide consists of whole crystallites, said crystallites forming medium-sized aggregates of not more than 1.5 µm. The method of preparation of this rare earth sulphide is characterised in that a rare earth compound is reacted with at least one sulphidising gas selected among hydrogen sulphide or carbon sulphide. The pigment can be part of compositions of the following types: plastic, paint, surface coating, rubber, ceramic, glazing, paper, ink, cosmetic products, dyes, leather, laminated coating or other types of compositions with a base of at least one mineral binder or obtained therefrom.
La présente invention concerne l'utilisation comme pigment colorant d'un sulfure de terre rare de forme bêta et son procédé de préparation. On utilise, selon l'invention, un sulfure de terre rare de forme bêta, la terre rare étant le lanthane, le cérium, le praséodyme, le samarium ou le néodyme. Le sulfure est constitué de cristallites entiers, lesdits cristallites formant des agrégats de taille moyenne d'au plus 1,5µm. Le procédé de préparation de ce sulfure de terre rare est caractérisé en ce qu'on fait réagir un composé de la terre rare au moins un gaz sulfurant choisi parmi le sulfure d'hydrogène ou le sulfure de carbone. Le pigment peut rentrer dans des compositions du type plastiques, peintures, lasures, caoutchoucs, céramiques, glaçures, papiers, encres, produits cosmétiques, teintures, cuirs, revêtements stratifiés ou du type à base ou obtenus à partir d'au moins un liant minéral.
Busnot Sylvain
Macaudiere Pierre
Rhodia Chimie
Robic
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