Subpigmentary titanium dioxide with improved photostability
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United States of America Patent
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Sep 19, 1995
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N/A
app pub date -
Nov 3, 1994
filing date -
Jul 11, 1992
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Abstract
Subpigmentary titanium dioxide with decreased photoactivity is produced if known ions for increasing photostability in titanium dioxide pigments are not deposited on the surface of the subpigmentary particles, but instead are included intracrystallinely in the pigment particle (i.e., doped). In a preferred process for preparation of doped subpigmentary titanium dioxide particles, an acid solution containing the dopant is added in two stages to a suspension of subpigmentary titanium dioxide.
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