Post-treated titanium dioxide and process for producing same

Details Post-treated titanium dioxide and process for producing same Post-treated titanium dioxide and process for producing same

1981-01-09

1983-02-22

Dees, Carl F.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106308B, 106308Q, 427218, C09C 136

Patent

active

043746756

ABSTRACT:
This invention concerns a new product consisting of TiO.sub.2 particles having pigmentary granulometric and morphological characteristics. It includes a chemically reactive coating consisting of a mixture of oxides and oxychlorides selected from the group consisting of Al.sub.2 O.sub.3 and AlOCl; SiO.sub.2 and SiOCl.sub.2 ; and ZrO.sub.2 and ZrOCl.sub.2.
The particles of reactive TiO.sub.2 product are prepared as follows: the surface of the TiO.sub.2 particles is activated by thermally treating the particles in a moving bed with an anhydrous gas at 400.degree.-600.degree. C. The particles are then made to react in a moving bed at 350.degree. C. to 600.degree. C., in the presence of a carrier gas, with an inorganic chloride selected from the group consisting of AlCl.sub.3, SiCl.sub.4 and ZrCl.sub.4.
This new product is useful, for instance, in TiO.sub.2 pigments coated with organic molecules which provide an affinity for the vehicles of paints.

REFERENCES:
patent: 3275412 (1966-09-01), Skrivan
patent: 3463610 (1969-08-01), Groves et al.
patent: 3515566 (1970-06-01), Moody et al.
patent: 3640744 (1972-02-01), Dietz et al.
patent: 3642442 (1972-02-01), Hoekje et al.
patent: 4050951 (1977-09-01), Piccolo et al.
patent: 4224080 (1980-09-01), Chambers et al.

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