Zinc sulfide based pigments containing selenium
AssigneeFerro Corporation
InventorGeorge P. Kinstle
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Abstract
Pigments are disclosed comprising zinc sulfide as a host containing in solid solution at least a sufficient amount of copper indium sulfide as a dopant to alter the color of the zinc sulfide, characterized in that selenium is substituted for at least some of the sulfur. Optionally, barium sulfate may be used as an extender. The pigment may be prepared by jointly precipitating the sulfides of the indicated metals and then firing to an equilibrium temperature to achieve a desired solid solution.
Claims14
In a pigment comprising a zinc sulfide host containing in solid solution a sufficient amount of copper indium sulfide to alter the color of the zinc sulfide;
- the improvement comprising substituting selenium in said copper indium sulfide for at least some of the sulfur up to all of said sulfur, said substitution of selenium causing a shift in the color response curve of said pigment determined by plotting wave length against percent reflectance.
A pigment comprising a zinc sulfide host containing in solid solution at least a sufficient amount of a dopant to alter the color of the zinc sulfide, said dopant corresponding to the formula:
- CuInS.sub.2-x Se.sub.x
- in which x is greater than zero but less than or equal to two, the presence of said selenium causing a shift in the color response curve of said pigment to a higher wave length and imparting a more intense color to said pigment.
A pigment comprising a zinc sulfide host containing in solid solution at least a sufficient amount of a dopant to alter the color of the zinc sulfide, said dopant comprising copper indium selenide, the presence of selenium in said pigment causing a shift in the color response curve of said pigment to a higher wave length and imparting a cleaner, purer, more intense color to said pigment.
Dependencies are inferred from the claim text.