Process for the coloration of organic media
AssigneeBayer Aktiengesellschaft
InventorsGunter Linde, Manfred Eitel
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Abstract
The present invention relates to a process for the colouration of organic media by granulated inorganic pigments.
Claims13
Process for the colouration of organic media with granulated inorganic pigments, wherein inorganic pigments are granulated in a multistage process with the addition of oils having a kinematic viscosity at 40.degree. C. of 1.6 to 1500 mm.sup.2 /s as binders to form granulated pigments of an average particle size of 0.2 to 2 mm without the recycling of a fines component and the granulated inorganic pigments are then mixed with the organic media and further wherein the inorganic pigments are charged together with the oils to a mixer, the pigment powder thus pretreated is subjected to a compacting stage with line forces of from 0.1 to 15 kN/cm to form flakes having a density of 0.5 to 3.0 g/cm.sup.3, the flakes are then broken down by subsequent rough grinding on a screen granulator into pregranulate and powder and these are completely pelletized by rerolling on a rotating pan or in a rotating drum.
Dependencies are inferred from the claim text.