Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1996-12-11
1998-03-17
Marcheschi, Michael
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106442, 106444, 106446, 423613, 423592, C09C 136
Patent
active
057282056
ABSTRACT:
The present invention provides a process for producing titanium dioxide (TiO.sub.2) pigment comprising boron oxide (B.sub.2 O.sub.3), comprising the steps of: (a) reacting titanium tetrachloride (TiCl.sub.4) in the vapor phase with an aluminum compound and an oxygen-containing gas in a reactor at a temperature in the range of about 900.degree. C. to about 1600.degree. C. to provide a gaseous suspension comprising TiO.sub.2 particles, and (b) contacting the gaseous suspension comprising the TiO.sub.2 particles with a boron compound to produce TiO.sub.2 pigment comprising B.sub.2 O.sub.3.
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M. Kamal Akhtar, Sotiris E. Pratsinis, Sebastian V. R. Mastrangelo, "Dopants in Vapor-Phase Synthesis of Titania Powders", Journal of the American Ceramic Society, 75, No. 12, 3408-3416, Dec. 1992.
Allen Alvin
Gergely John Steven
E. I. Du Pont de Nemours and Company
Marcheschi Michael
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