Bayer Aktiengesellschaft

Jurgen Spille

Hans J Rosenkranz

Karlheinz Wolf

Reinhold Hornle

Hans-Heinz Molls

Konrad Nonn

Peter Rasche

Heinz P Hemmerich

Dietmar Kranz

Gottfried Popp

The application relates to a process for the preparation of pigment concentrates, preferably pulverulent pigment concentrates, which is characterized in that the polymer present in an intimate mixture, free from non-ionic surface-active agents, of an aqueous pigment suspension and an aqueous latex of a polymer or polycondensate containing carboxyl groups, or an aqueous solution of a polymer or polycondensate containing carboxyl groups, is coagulated by adding an electrolyte, while thoroughly mixing intensively, and the coagulate containing the pigment is then separated off in a known manner and optionally dried. The pigment concentrates are suitable for pigmenting aqueous media and printing pastes for pigment printing of textiles.

Preparation of pigment concentrates

Process for the manufacture of pigment preparations by comminution in the presence of surface-active agents which can be saponified under acid or alkaline conditions and which contain at least one group which confers solubility in a radical which is to be split off during the saponification.

Pigment formulation

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Schildgen, Germany

Jurgen Spille