Metal additions to pigments of pseudobrookite-titanium dioxide s

Details Metal additions to pigments of pseudobrookite-titanium dioxide s Metal additions to pigments of pseudobrookite-titanium dioxide s

1975-10-20

1977-07-19

Douglas, Winston A.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106304, 423598, 423594, C09C 136, C09C 122, C01G 2300, C01G 4900

Patent

active

040366626

ABSTRACT:
In the production of temperature-stable inorganic pigment of pseudobrookite-titanium dioxide structure having the composition Fe.sub.2 TiO.sub.5.sup.. x TiO.sub.2, wherein x is from 0 to about 15, by preparing a suspension of finely divided titanium dioxide or titanium dioxide hydrate and at least one of finely divided iron oxide, iron oxide hydroxide, iron hydroxide and iron carbonate, removing the aqueous phase of the suspension from a solid residue and calcining the residue at a temperature in the range of about 600.degree. to 1100.degree.C, the improvement which comprises including in the suspension or in the solid residue at least one compound of a metal selected from the group consisting of lithium, sodium, potassium, magnesium, zinc, calcium, aluminum, copper, vanadium, chromium, manganese, cobalt and nickel, the compound being present in a quantity to provide about 0.1 to 10 % by weight of metal based on the pigment. With the addition of compounds of lithium, sodium, potassium, magnesium, zinc, calcium or aluminum even in small amounts a much purer yellow color results.

REFERENCES:
patent: RE21427 (1940-04-01), McKinney et al.
patent: 2084826 (1937-06-01), Ryan et al.
patent: 2940941 (1960-06-01), Dalton
patent: 3214283 (1965-10-01), Chopoorian
patent: 3874890 (1975-04-01), Bernhard et al.

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