Bayer Aktiengesellschaft

Michael Kressner

Georg Pape

Karlheinz Wolf

Konrad Nonn

Fritz Bremer

Josef Leitermann

Christian Wamprecht

Stephan Kirchmeyer

Reinhold Hornle

Rainer Hamprecht

Klaus Walz

Richard Sommer

Udo Herrmann

Winfried Kruckenberg

Peter-Roger Nyssen

Ferdinand Kummeler

Joachim Kolbe

Gerd Schmitz

Manfred Wiesel

Pigment preparations

This invention relates to pigment preparations containing

Process for the coloring of thermoplastics in the mass, characterized in that dyestuffs of the formula ##STR1## are used in which X denotes H, alkyl, preferably C.sub.1 -C.sub.6 -alkyl, cycloalkyl, preferably C.sub.5 -C.sub.6 -cycloalkyl, CF.sub.3, halogen, preferably F, Cl, Br,

Colored thermoplastic resin composition

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

A process for dyeing polyurethane plastics is disclosed in which an azo dyestuff derived from an indole or 5-aminopyrazole coupling component and containing at least one group having an active hydrogen atom, e.g. hydroxyl aor amino, is introduced during the reaction forming the polyurethane whereby the dyestuff is bonded to the polyurethane by a covalent bond resulting from reaction of the active hydrogen on the dyestuff with a polyurethane reaction component, e.g. polyisocyanate. The dyed polyurethanes produced by this process having a very high level of fastness, e.g. fastness to bleeding upon overcoating.

Process for dyeing polyurethane plastics

Dyestuffs of the formula ##SPC1## Wherein:

Process for dyeing polyurethane resins

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Leichlingen, Germany

Michael Kressner