Bayer Aktiengesellschaft

Fritz Bremer

Karlheinz Wolf

Reinhold Hornle

Michael Kressner

Georg Pape

Alfred Pischtschan

Hans-Heinz Molls

Konrad Nonn

Hans Schulze

Horst Brandt

Jochen Koll

Ferdinand Kummeler

Joachim Kolbe

Bernhard Arnold

Peter Rasche

Willy Schiwy

Volker Aign

Erhard Schuffenhauer

Wilhelm Berlenbach

Werner Kullick

Dyestuff preparations which are capable of flow and contain (a) at least one dyestuff which is sparingly soluble or insoluble in water, (b) at least one polyester of phthalic acid and a polyalcohol and optionally a monohydric alcohol with 1-18 C atoms and (c) optionally further auxiliaries, and their use for dyeing plastics, in particular polyurethane plastics.

Dyestuff preparations, processes for their production and their use for

Colorant preparations, a process for their production and their use for

Highly concentrated liquid preparations of disperse dyestuffs are obtained with a low consumption of energy by first adding a dispersing agent to the water-moist dyestuff press-cake to convert it into a form in which it is capable of flow, subjecting this product to wet grinding and increasing the dyestuff content of the resulting, insufficiently concentrated dispersion in a second step by means of a membrane separation process, for example pressure permeation.

Process for producing liquid dyestuff preparations

A pigment preparation containing a pigment, a nonionic surface-active agent and, as a thermoplastic finishing agent, a copolymer which has an average molecular weight of 80,000 to 160,000 and consists of 90-50% by weight of .alpha.-methylstyrene and 10-50% by weight of acrylonitrile, and its use for the mass coloring of thermoplastic moulding compositions.

Pigment preparations

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

Growing community of inventors

Leverkusen, Germany

Fritz Bremer