| 摘要 |
PURPOSE: A use of a beta rare earth sulfide as colouring pigment and its method of preparation are provided. CONSTITUTION: A beta rare earth sulfide is used, the rare earth being lanthanum, cerium, praseodymium, samarium or neodymium. The sulfide consists of whole crystallites, said crystallites forming medium-sized aggregates of not more than 1.5 mu m. The method of preparation of this rare earth sulfide is characterized in that a rare earth compound is reacted with at least one sulfidizing gas selected among hydrogen sulfide or carbon sulfide. 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. |
