Compositions: coating or plastic – Materials or ingredients – Miscellaneous
Patent
1985-11-04
1987-06-30
Lieberman, Paul
Compositions: coating or plastic
Materials or ingredients
Miscellaneous
106288R, 106309, C04B 1400
Patent
active
046768386
ABSTRACT:
In the production of an .alpha.-iron oxide pigment by the hydrothermal treatment of a trivalent iron-containing solution or suspension, the improvement which comprises adding to the solution or suspension prior to the hydrothermal treatment active .alpha.-iron oxide seeds with lamellar or disc-like crystal form and a specific surface of at least 10 m.sup.2 /g, whereby the resulting pigment is lamellar with an Fe.sub.2 O.sub.3 content of at least 88%, an average particle diameter of from 0.5 to 20 .mu.m, an average ratio of diameter to thickness of from 20 to 100, and an almost normally distributed particle size distribution, the relative standard deviation of which, based on the average value of the normal distribution, is less than 0.3. The product has superior coloring properties and is used as a precursor compound for the production of lamellar magnetic pigments with superior magnetic properties.
REFERENCES:
patent: 3869298 (1975-03-01), Suzuki et al.
patent: 3946103 (1976-03-01), Hund
patent: 4404254 (1983-09-01), Franz et al.
Abstracts Agency of Ind. Sci. Tech(TKAK), Japanese Patent JA-089791.
Franz Gerhard
Heine Heinrich
Schonfelder Lothar
Bayer Aktiengesellschaft
Lieberman Paul
Thompson Willie J.
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