Multilayer interference pigments
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United States of America Patent
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-
Sep 4, 2001
Grant Date -
May 17, 2001
app pub date -
Jan 11, 2001
filing date -
Mar 9, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Multilayer interference pigment consisting of plateletlike titanium dioxide as carrier material, coated with alternating layers of metal oxides of low and high refractive index, the difference in the refractive indices being at least 0.1, which is obtainable by solidification and hydrolysis of an aqueous solution of a thermally hydrolysable titanium compound on a continuous belt, detachment of the resulting coat, coating of the resulting titanium dioxide platelets, with or without drying in between, by a wet method with, alternately, a metal oxide hydrate of high refractive index and a metal oxide hydrate of low refractive index by hydrolysis of the corresponding, water-soluble metal compounds, separation, drying and, if desired, calcining of the material obtained.
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