Fine division in the preparation of copper phthalocyanine pigmen

Details Fine division in the preparation of copper phthalocyanine pigmen Fine division in the preparation of copper phthalocyanine pigmen

1995-04-13

1996-02-20

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

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

106272, 106410, 106411, 106413, 106493, 106494, 540122, 540139, 540144, C09B 4704

Patent

active

054925630

ABSTRACT:
Copper phthalocyanine pigments are finely divided in an ecologically and economically advantageous manner by first of all subjecting crude, coarsely crystalline copper phthalocyanine pigments to dry milling and then wet milling the finely divided prepigments which are obtained in the course of dry milling, in aqueous suspension and with the addition of from 0.1 to 5% by weight, based on the total millbase, of an organic solvent which is inert with respect to the process conditions, on a stirred ball mill which is operated at an energy 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. Copper phthalocyanine pigments prepared in this way are particularly suitable as colorants for pigmenting paints, printing inks and plastics.

REFERENCES:
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patent: 2964532 (1960-12-01), Klenke, Jr.
patent: 3017414 (1962-01-01), Minnich
patent: 4024154 (1977-05-01), Jackson
patent: 4257951 (1981-03-01), Matrick
patent: 5062577 (1991-11-01), Schmitt et al.
patent: 5074918 (1991-12-01), Babler
patent: 5229508 (1993-07-01), Ikegaya et al.
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patent: 5296034 (1994-03-01), Dietz et al.
Derwent abstract 81995 D/45 of EP --38-737, Oct. 1981.
Derwent abstract 37566 K/16 of JP 58-040,333, Mar. 1983.
Derwent Abstract 72-25889T/17 of DE2049225 Apr. 1972.

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