Technische Anforderungen des Papiermachers an moderne Pigmentpräparationen

Beside direct dyes and basic dyes, organic pigments amount approx. 10% of the colorant market for coloration of paper. Organic pigments regulary dispose of outstanding fastnesses. Because of their strongly developed hydrophobic character organic pigments are only as pigment preparations suitable in aqueous systems. In such aqueous pigment preparations, organic pigments become hydrophilic by interaction with surfactants (dispersing agents). Technical properties of pigment preparations like color strenght, brilliance, retention, foaming and shear stability depend by the used surfactant. Often for paper coloration so called universal preparations are used, which originally were developed for other applications. In most cases this results in compromises, like limited storage stability, unsuitable charge, low pigment content etc. Optimum results can only be attained by pigment preparations, which are especially developed for application in paper stock or surface.