Fine division in the preparation of organic pigments

Details Fine division in the preparation of organic pigments Fine division in the preparation of organic pigments

1995-04-13

1997-05-06

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106493, 106494, 106495, 106498, 106 3128, 106 3147, 106 3151, 523160, 523461, C09B 4800, C09B 314

Patent

active

056266626

ABSTRACT:
Organic polycyclic crude pigments are finely divided in an ecologically and economically advantageous manner by first of all subjecting crude, coarsely crystalline pigments to dry milling and wet-milling the resulting finely divided prepigments in aqueous suspension in a stirred ball mill which is operated at a power density of more than 2.5 kW per liter of milling space and a peripheral stirrer speed of more than 12 m/s under the action of grinding media having a diameter of less than or equal to 1 mm. Pigments prepared in this way are particularly suitable as colorants for the pigmentation of paints, printing inks and plastics.

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