Process for the production of ink concentrates
AssigneeCiba Specialty Chemicals Corporation
InventorsRobert Langley, Paul Kerwin, Arthur Stark Walls, Kenneth Grant Dykes
Life of this patent
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Abstract
A process for the preparation of an ink concentrate which comprises (a) milling a crude metal phthalocyanine to reduce the particle size thereof, thereby forming a modified crude metal phthalocyanine and (b) kneading a mixture of the modified crude metal phthalocyanine together with an ink vehicle comprising one or more ink solvents, the metal phthalocyanine being present in an amount of 20 to 80% by weight of the kneaded mixture, to give an ink concentrate containing the metal phthalocyanine in pigmentary form dispersed in the ink vehicle.
Claims19
A process for the preparation of a non-aqueous ink concentrate suitable for use as a stir in concentrate for forming non-aqueous ink compositions which process comprises
- (a) milling a crude metal phthalocyanine to reduce the particle size thereof, thereby forming a milled crude metal phthalocyanine;
- and
- (b) kneading the modified crude metal phthalocyanine together with a non-aqueous ink vehicle comprising one or more organic ink solvents which is an aliphatic alcohol having at least 12 carbon atoms or an aliphatic carboxylic acid having at least 4 carbon atoms with a shear gradient from 300 to 20,000 s.sup.-1, the metal phthalocyanine being present in an amount of 20 to 80 % by weight of the kneaded mixture,
- to give a non-aqueous lithographic ink or letterpress ink concentrate containing the metal phthalocyanine in pigmentary form dispersed in the non-aqueous ink vehicle.
Dependencies are inferred from the claim text.