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Composition based on a rare-earth metal sulphide comprising at least one alkali metal element, its process of preparation and its use as a coloured pigment
Composition based on a rare-earth metal sulphide comprising at least one alkali metal element, its process of preparation and its use as a coloured pigment
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机译:基于包含至少一种碱金属元素的稀土金属硫化物的组合物,其制备方法及其作为有色颜料的用途
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摘要
The compsns. are based on a rare earth metal sulphide doped with 1 alkali metal, where the sulphide is in the form of microcrystalline particles with an average size of NOTGREATER 1.5 mu m. Also claimed is: (i) a process for prepn. of a compsn. based on a rare earth metal sulphide doped with 1 alkali metal, comprising contacting a rare earth metal carbonate or hydroxycarbonate with 1 alkali metal cpd. and heating in the presence of H2S and/or CS2; (ii) a coloured pigment comprising 1 compsn. as above; and (iii) coloured materials, esp. plastics, paints, lacquers, rubber, ceramics, glazes, paper, inks, cosmetic prods., dyes (teintures) and laminated coatings, contg. a compsn. or pigment as above.
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