Pigment formulation, a process for its preparation, and its use
AssigneeHoechst Aktiengesellschaft
InventorsManfred Schneider, Reinhold Deubel, Manfred Zimmermann
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Abstract
The invention relates to readily dispersible strong pigment formulations containing arylpararosanilinesulfonic acid pigments of the formula ##STR1## and a polyester resin which has been water-solubilized by neutralizing the carboxyl groups with nitrogen bases. The pigment formulations are distinguished by being very readily dispersible in the various printing ink binders and by having a high tinctorial strength.
Claims7
A pigment formulation containing (a) an arylpararosanilinesulfonic acid pigment of the formula ##STR6## in which R.sup.1, R.sup.2 and R.sup.3 each are hydrogen, chlorine, bromine or an alkyl or an alkoxy group of 1-3 carbon atoms in either case, coated by
- (b) a water-soluble polyester resin which has been prepared by mixing or partially condensing a water-insoluble film-forming polyhydroxyl compound having an acid number of less than 10 mg of KOH/g and a hydroxyl number of 50 to 650 mg of KOH/g and a filmforming polycarboxyl compound having an acid number of 30 to 280 mg of KOH/g in a molar ratio of carboxyl groups to hydroxyl groups of 1:2 to 1:25, and partially or completely neutralizing the carboxyl groups with nitrogen bases.
Dependencies are inferred from the claim text.