Method for the production of phthalocyanine pigment preparations
AssigneeClariant Produkte (Deutschland) GmbH
InventorsKlaus Brychcy, Joachim Weber, Heidrun Mehler
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Abstract
A method for the production of a phthalocyanine pigment preparation includes finely distributing a crude phthalocyanine pigment by dry milling, wet milling, salt kneading, acid pasting or acid swelling to give a pre-pigment, the pre-pigment is subjected to a finishing treatment in a mixture of water and an organic solvent at alkaline pH, increased temperature and in the presence of at least one pigment dispersant from the group of phthalocyanine sulphonic acids, phthalocyanine carboxylic acids, phthalocyanine sulphonate salts, phthalocyanine carboxylate salts and phthalocyanine suiphonamides.
Claims20
A method for the production of a phthalocyanine pigment preparation, comprising the steps of finely dividing a crude phthalocyanine pigment by a method selected from the group consisting of dry grinding, wet grinding, salt kneading, acid pasting and acid swelling to form a prepigment and subjecting the prepigment to a finish treatment in a mixture of water and an organic solvent at alkaline pH, at a temperature between 50° and 250° C. and in the presence of at least one pigment dispersant selected from the group consisting of phthalocyaninesulfonic acids, phthalocyaninecarboxylic acids, phthalocyaninesulfonic salts, phthalocyaninecarboxylic salts and phthalocyaninesulfonamides.
A method for the production of a phthalocyanine pigment preparation comprising the steps of finely dividing a crude phthalocyanine pigment by a method selected from the group consisting of dry grinding, wet grinding in an inert liquid medium in a conventional continuous or discontinuous low-energy agitated ball mill operated with a power density at less than 2.5 kW per liter of grinding space and with a peripheral stirrer speed of less than 12 m/s under the action of grinding media, salt kneading, acid pasting and acid swelling to form a prepigment and subjecting the prepigment to a finish treatment in a mixture of water and an organic solvent at a pH greater than or equal to 11, at a temperature of 100° C. to 250° C., and in the presence of at least one pigment dispersant selected from the group consisting of phthalocyaninesulfonic acids, phthalocyaninecarboxylic acids, phthalocyaninesulfonic salts, phthalocyaninecarboxylic salts and phthalocyaninesulfonamides.
Dependencies are inferred from the claim text.