Manufacture of easily dispersed transparent iron oxide pigments
AssigneeBASF SE
InventorsHans Peter von Lauff, Wolfgang Fabian, Heidrun Hellstern
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Abstract
A process for the manufacture of easily dispersed, transparent iron oxide pigments of high tinctorial strength, in which the pigment paste, moist with water, is homogenized under the action of shear forces in the presence of at least one monohydric aliphatic or cycloaliphatic alcohol of 4 to 12 carbon atoms which is partially soluble in water and can be vaporized without decomposition, and the kneaded mixture is then dried under gentle conditions. The pigments are easily dispersed in finishes or binder solutions for printing inks. Very pure and glossy colorations of optimum transparency are obtained.
Claims11
A process for the manufacture of easily dispersed, transparent iron oxide pigments of high tinctorial strength from iron oxide pigment pastes moist with water, which comprises homogenizing said paste in the presence of from 0.1 to 20 percent by weight, based on dry iron oxide, of a monohydric aliphatic or cycloaliphatic alcohol of 4 to 12 carbon atoms, which is only partially soluble in water and can be vaporized without decomposition, or of mixtures of such alcohols, under the action of shear forces, and drying the mixture under gentle conditions.
Dependencies are inferred from the claim text.