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US 6,284,035 B1Granted
Pigment preparations in granule form
AssigneeBASF SE
InventorsHansulrich Reisacher, Anton Dotter, Gerhard Berger, Otmar Pelz, Oliver Seeger
Life of this patent
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Abstract
Pigment preparations in granule form comprising as essential constituents from 50 to 99.5% by weight of at least one inorganic pigment and from 0.5 to 50% by weight of at least one organic pigment are prepared and used for coloring polymeric materials.
Claims12
A pigment preparation in granule form consisting essentially of:
- from 50 to 99.5% by weight of at least one synthetically produced inorganic pigment;
- and from 0.5 to 50% by weight of at least one synthetically produced organic pigment, obtained by wet-milling a mixture of said pigments in as synthesized crude form, with or without a dispersing assistant in an amount up to 2% by weight of the pigments, to produce a pigment suspension millbase and subjecting said millbase to agitated drying to obtain granules.
A process for producing a pigment preparation in granule form consisting essentially of:
- from 50 to 99.5% by weight of at least one synthetically produced inorganic pigment;
- and from 0.5 to 50% by weight of at least one synthetically produced organic pigment, which comprises conjointly wet-milling a mixture of said pigments, with or without a dispersing assistant in an amount up to 2% by weight of the pigments, in as synthesized crude form to produce a pigment suspension millbase and subsequently drying the pigment suspension millbase with agitation to obtain granules.
Dependencies are inferred from the claim text.