Rare earth sulphide composition with improved chemical stability, preparation method and use thereof as pigment
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United States of America Patent
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Issued Date -
Aug 28, 2003
app pub date -
Mar 19, 2003
filing date -
Mar 30, 2000
priority date (Note) -
Abandoned
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Abstract
The present invention concerns a composition based on a rare earth sulphide with improved stability, a process for its preparation and to use as a colouring pigment. The composition of the invention is characterized in that it contains a support based on a rare earth sulphide and a layer based on at least one salt of said rare earth sulphide, a hydroxide, an oxide of said rare earth or an oxy and/or hydroxy derivative thereof, the salt, hydroxide, oxide and derivative being insoluble in water and/or in alcohols. Said composition is obtained by acid attack of the surface of said support optionally followed by neutralisation.
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