Process for producing coated TiO.sub.2 pigment using cooxidation

Details Process for producing coated TiO.sub.2 pigment using cooxidation Process for producing coated TiO.sub.2 pigment using cooxidation

1997-12-23

1999-07-13

Green, Anthony

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106442, 106443, 106444, 106446, 423611, 423612, 423613, C09C 136

Patent

active

059221208

ABSTRACT:
The present invention provides a process for producing titanium dioxide (TiO.sub.2) pigment having a coating comprising silica and a second oxide selected from the group consisting of oxides of boron, phosphorus, magnesium, niobium, germanium, and mixtures thereof, 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, (b) contacting the gaseous suspension comprising the TiO.sub.2 particles with a silicon halide and an oxide precursor of boron, phosphorus, magnesium, niobium, germanium, and mixtures thereof, and (c) cooling the gaseous suspension to produce TiO.sub.2 pigment having a coating comprising silica and a second oxide.

REFERENCES:
patent: 3856929 (1974-12-01), Angerman et al.
patent: 4214913 (1980-07-01), Glaeser
patent: 5562764 (1996-10-01), Gonzalez
patent: 5599519 (1997-02-01), Haddow
patent: 5728205 (1998-03-01), Allen et al.
patent: 5730795 (1998-03-01), Herkimer
Gas-Ohase Coating of Titania with Metal Oxides in an Aerosol Flow Reactor; G.P.Fotou et al; Proceedings of AIChE Meeting, 1996.
Gas-phase coating of Ti02 with SiO2 in a continuous flow hot-wall aerosol reactor; Q.H.Powell et al; Oct. 1996.
Synthesis of Alumina-and Alumina/Silica-Coated Titania Particles in an Aerosol Flow Reactor; Q.H.Powell et al, Jan. 1997.
A Theoretical Study on Gas-Phase Coating of Aerosol Particles, S.Jain, et al; Aug. 1996.
Chemical Kinetics of the Reactions of SiCl4, SiBr4, GeCl4, POCl3, and BCl3
Kinetics of Titanium (IV) Chloride Oxidation; S.E.Pratsinis et al; Apr. 1990.
Dopants in Vapor-Phase Synthesis of Titania Powders; M.K.Akhtar et al; Aug. 1992.

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