Process for the preparation of liquid pigment preparations

Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...

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106410, 106411, 106413, 106493, 106494, 106495, 106496, 106497, 106498, 540141, 540144, 546 49, 546 50, C09B 6750

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active

058006079

ABSTRACT:
Process for the preparation of pigment preparations, which comprises wet milling the crude pigments which are present in coarsely crystalline state, or prepigments or pigments which are present in a form in which they are difficult to disperse, in a concentration of from 20 to 60% by weight based on the total weight of the pigment preparation, in a flocculation-stable liquid medium and in a stirred ball mill which is operated with a peripheral stirrer speed of more than 12 m/s, under the action of nonmetallic grinding media with a diameter of less than or equal to 1.0 mm, until the desired degree of fine division is reached, and then isolating the pigment preparation.

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patent: 5626662 (1997-05-01), Urban

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