Rare earth sesquisulfide compositions comprising alkali/alkaline earth metal values
AssigneeRhone-Poulenc Chimie
InventorsThierry Chopin, Herve Guichon, Olivier Touret
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Abstract
Unique compositions based on at least one crystalline rare earth sesquisulfide, well suited for the coloration of a wide variety of substrates, e.g., cosmetics, plastics, paints and rubbers, contain a dopant amount of at least one alkali/alkaline earth metal, at least a fraction of which being included within the crystal lattice of such at least one rare earth sesquisulfide.
Claims38
A composition of matter comprising (1) at least one crystalline rare earth sesquisulfide having the formula M.sub.2 S.sub.3, in which M is at least one element selected from among the lanthanides and yttrium, and (2) a dopant amount of at least one alkali and/or alkaline earth metal, at least a fraction of said at least one alkali and/or alkaline earth metal being included within the crystal lattice of said at least one rare earth sesquisulfide and said sesquisulfide having a Th.sub.3 P.sub.4 crystallographic structure.
A composition of matter comprising unground crystalline particles of a rare earth sesquisulfide having the formula M.sub.2 S.sub.3, in which M is at least one element selected from among the lanthanides and yttrium, and a color enhancing amount of at least one alkali and/or alkaline earth metal included within the crystal lattice of said at least one rare earth sesquisulfide.
A pigment suitable for the coloration of substrates comprising crystalline particles of a rare earth sesquisulfide having the formula M.sub.2 S.sub.3, in which M is at least one element selected from among the lanthanides and yttrium, and a color enhancing amount of at least one alkali and/or alkaline earth metal included within the crystal lattice of said at least one rare earth sesquisulfide.
Dependencies are inferred from the claim text.