Method for preparing polycrystalline fibrous TiO.sub.2 pigment

Details Method for preparing polycrystalline fibrous TiO.sub.2 pigment Method for preparing polycrystalline fibrous TiO.sub.2 pigment

1977-03-18

1978-06-20

Douglas, Winston A.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106306, 106308B, 423615, C09C 136

Patent

active

040959937

ABSTRACT:
A polycrystalline, fibrous rutile TiO.sub.2 pigmentary material having good optical properties and retention in paper, and exceptionally high tinting strength in latex paint systems is prepared by treating a substantially sulfate-free hydrous TiO.sub.2, prior to calcination, with a mineralizing complex comprising alkali metal and alkaline earth metal salts, a compound of boron and a rutile promoter sol, and calcining the treated hydrous TiO.sub.2 at temperatures in the ranges of from 812.degree.-865.degree. C. followed by washing to remove the calcium ions, milling, hydroclassification and drying; or optionally by a postcalcination treatment for imparting optimum pigmentary properties.

REFERENCES:
patent: 2143851 (1939-01-01), Allan
patent: 3088840 (1963-05-01), Arkless et al.
patent: 3862297 (1975-01-01), Claridge et al.

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