Bayer Aktiengesellschaft

Mobay Chemical Corporation

Peter Rasche

Horst Harnisch

Hans J Rosenkranz

Karlheinz Wolf

Reinhold Hornle

Hans Schulze

Heinz Muller

Fritz Bremer

Gert F Baumann

Volker Aign

Jurgen Spille

Dietmar Kranz

Heinz P Hemmerich

Helmuth H Prochaska

Alberto Gonzales-Dorner

Wilhelm Berlenbach

An acid monomethine-metal complex dyestuff of the formula ##STR1## wherein M, Z, R, A, Y, n, a and b have the meaning given in the description. The acid metal complex dyestuffs of the formula I are valuable dyestuffs which are outstandingly suitable for dyeing and printing wool, silk and especially synthetic polyamides, such as NYLON and PERLON, in very clear shades ranging from yellow to blue, and are distinguished by high tinctorial strength, good build-up capacity and affinity and very good fastness characteristics, especially fastness to light.

Acid monomethine-metal complex dyestuffs

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

The present invention is concerned with a process for dry printing or dyeing of sheets. A foam structure is printed or dyed and placed in contact with the sheet to be treated. The composite is subjected to sufficient heat and pressure to destroy the foam structure without significantly damaging the sheet. The result is the sheet surface now appears to carry the printing or dyeing. Among the suitable carrier foams are polyurethane foams. The process finds particular utility in coloring difficult to dye substrates such as cotton, fiber glass or asbestos fabrics with water insoluble dyes.

Process for dyeing and printing sheets

Aqueous dyestuff dispersions which contain water-insoluble dyestuffs and water-soluble oxyalkylation products of compounds which are obtainable by the addition of styrene or its derivatives onto phenols or naphthols, or derivatives of such oxyalkylation products, are suitable for pigmenting natural or synthetic materials.

Aqueous dyestuff dispersions

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Aachen, Germany

Peter Rasche