Treated titanium dioxide
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United States of America Patent
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Jun 8, 1999
Grant Date -
N/A
app pub date -
Jul 31, 1997
filing date -
Aug 15, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A pigmentary material comprises particulate titanium dioxide the particles of which have been treated with a polymeric hindered amine stabiliser. The stabiliser is a polymer having a main chain substantially free of acidic groups and having hindered amine stabilising groups. The stabilising groups comprise at least 35 per cent by weight of the polymer. Preferably, the titanium dioxide particles are also treated with an organic compound such as a polyhydric alcohol, an alkanolamine, a polysiloxane or a fatty acid.
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