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AssigneeHoechst Aktiengesellschaft
InventorsHorst-Dieter Wasel-Nielen, Renate Adrian, Herbert Panter, Gero Heymer, Alexander Maurer, Raban von Schenck
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The invention relates to a process for making phosphorus-containing anticorrosive pigments having a size of at most 20 microns by reacting one or more compounds of magnesium, calcium, strontium, barium, zinc, aluminum, iron, chromium or manganese with an oxygen acid of phosphorus or its alkali metal or ammonium salts at temperatures within the range 10.degree. to 100.degree. C. More particularly pigments consisting to an extent of at least 90% of particles with a size between 0.05 and 8 microns are produced by introducing an aqueous suspension or solution of the reactants into a dispersing means rotating at a speed of 3000 to 10,000 rpm, reacting the reactants by intimately mixing them, and separating and drying precipitated pigment.
In a process for making phosphorus-containing anticorrosive pigments having a size of at most 20 microns by reacting at least one compound of the metals selected from the group consisting of magnesium, calcium, strontium, barium, zinc, aluminum, iron, chromium and manganese with an oxygen acid of phosphorus or an alkali metal or ammonium salt of said acid at temperatures within the range 10.degree. to 100.degree. C., the improvement which comprises:
Dependencies are inferred from the claim text.