Hydrothermal process for producing dense iron oxide pigments

Details Hydrothermal process for producing dense iron oxide pigments Hydrothermal process for producing dense iron oxide pigments

1977-07-18

1979-02-20

Douglas, Winston A.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

252 6262, 252 6256, 423633, 106308C, C09C 124, C04B 3526

Patent

active

041405390

ABSTRACT:
An acicular to prismatic ferrimagnetic iron oxide pigment with a porosity of less than about 10% by volume, and optionally containing up to about 15% by weight of other metal oxides such as Zn or especially Co, are produced by heating a suspension of iron(III)oxide hydroxide in an autoclave to a temperature above about 100.degree. C in the presence of at least one mono-, di- or tri-saccharide, at least one alkali metal or alkaline earth metal hydroxide or carbonate and excess water, and washing, filtering and drying the resulting pigments.

REFERENCES:
patent: 3557266 (1971-01-01), Chiba et al.
patent: 3989794 (1976-11-01), Berchtold

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