Silicas
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United States of America Patent
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Jun 10, 1997
Grant Date -
N/A
app pub date -
Jun 15, 1995
filing date -
Nov 12, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An amorphous silica has a pore size distribution wherein 90% of the pores have a diameter above 15 nanometers, and less than 20% of the pore volume is in pores having a pore diameter between 10 and 20 nanometers, the amorphous silica having a CTAB surface area of less than 100 m.sup.2 /g, the amorphous silica having a matting efficiency of below 20 gloss units at an incidence angle of 60.degree. and a loading of 5% by weight. It can be prepared by a precipitation route. It is used in thixotropic paints and lacquers.
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