Process for the preparation of 4,10-dibromoanthanthrone pigment

Details Process for the preparation of 4,10-dibromoanthanthrone pigment Process for the preparation of 4,10-dibromoanthanthrone pigment

1995-09-14

1997-03-25

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

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

106493, 106 23R, C08K 500

Patent

active

056140150

ABSTRACT:
A process for the preparation of 4,10-dibromoanthanthrone pigment, which comprises first subjecting the crude 4,10-dibromoanthanthrone pigment, which is in the coarsely crystalline state, to wet milling in an aqueous medium in a stirred ball mill which is operated at a power density of more than 2.5 kW per liter of milling space and at a peripheral stirrer speed of more than 12 m/s under the action of grinding media with a diameter of less than 1.0 mm, until the desired degree of fine division is reached (millbase suspension), and then isolating the resulting pigment in a conventional manner; or subjecting the prepigment obtained in the wet milling to a treatment at elevated temperature (finish) in an aqueous medium, an aqueous-organic medium or a liquid aromatic compound, and then isolating the pigment.

REFERENCES:
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patent: 4432796 (1984-02-01), Santimauro
patent: 4705572 (1987-11-01), Spietschka et al.
patent: 5062577 (1991-11-01), Schmitt et al.
patent: 5071483 (1991-12-01), Dietz et al.
patent: 5229515 (1993-07-01), Pfenninger et al.
patent: 5296034 (1994-03-01), Dietz et al.
patent: 5318627 (1994-06-01), Dietz et al.
Fiat Final Report 1313:88-90, vol. II (Feb. 1948).

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