Bayer Aktiengesellschaft

Georg Pape

Michael Kressner

Konrad Nonn

Karlheinz Wolf

Fritz Bremer

Reinhold Hornle

Rainer Hamprecht

Richard Sommer

Winfried Kruckenberg

Ferdinand Kummeler

Joachim Kolbe

Manfred Wiesel

Werner Theuer

Guenther Boehmke

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

Anionic dyestuffs which contain as the cation at least one cation of the formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 denote alkyl with 1-6 C-atoms, cycloalkyl with 5-7 C-atoms or aralkyl with 7-12 C-atoms or represent a group ##STR2## wherein R.sub.4 and R.sub.5 denote hydrogen, methyl or ethyl and

Concentrated solutions of anionic dyestuffs

Dyestuffs of the formula ##SPC1## Wherein:

Process for dyeing polyurethane resins

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Leverkusen, Germany

Georg Pape