Color pure iron oxide pigments, a process for their...

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

C - Chemistry, Metallurgy

09

C

6/210

C09C 1/24 (2006.01)

Patent

CA 1308519

New, color pure iron oxide pigments, a process for their preparation and their use ABSTRACT OF THE DISCLOSURE Iron oxide red pigments comprise clusters of a plurality of pigment particles, preferably at least five intergrown spherical particles, are prepared by conduct- ing 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 pre- cipitated .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. Le A 24 955

566763

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