Color pure iron oxide pigments, a process for their preparation

Details Color pure iron oxide pigments, a process for their preparation Color pure iron oxide pigments, a process for their preparation

1988-05-02

1990-03-27

Lieberman, Paul

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106456, C07C 124, C08K 322

Patent

active

049117602

ABSTRACT:
Iron oxide red pigments comprise clusters of a plurality of pigment particles, preferably at least five intergrown spherical particles, are prepared by conducting nuclear formation of iron oxide yellow .alpha.-FeOOH in the presence of compounds of the elements, B, Al, Ga, Si, Ge, Sn or mixtures thereof in quantities of from 0.05 to 10% by weight, calculated as tri- or tetravalent oxides and based on the arithmetically calculated precipitated .alpha.-FeOOH nuclei, separating brine from the resulting yellow slurry to isolate an iron oxide yellow paste, drying and annealing the paste to form iron oxide red pigment and grinding the red pigment, which pigment is useful in coloring foodstuffs, lacquers, plastics and building materials.

REFERENCES:
patent: 4153472 (1979-05-01), Pellizzon et al.
patent: 4261966 (1981-04-01), Portes et al.
patent: 4620879 (1986-11-01), Burow et al.
patent: 4698100 (1987-10-01), Burow et al.
patent: 4702776 (1987-10-01), Hoffner et al.
patent: 4753680 (1988-06-01), Burow et al.
T. C. Patton: "Pigment Handbook, Properties and Economics", Band 1, 1973, pp. 333, 338, John Wiley & Sons.
Derwent Abstracts, an 75-01128w/01, "Red Iron Oxide Pigment Production", Soviet Union Pat. 418506, 7/30/74.

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