Bayer Aktiengesellschaft

Hans-Gunter Otten

Gerhard Wolfrum

Erich Klauke

Wolfgang Harms

Herbert Hugl

Klaus Leverenz

Winfried Kruckenberg

Horst Brandt

Karlheinz Wolf

Horst Nickel

Richard Sommer

Gunter Gehrke

Dieter Wiegner

Rolf Muders

Wolfgang Haebler

Hans Werner Petroll

Heinz Geiger

Azo dyestuffs of the formula ##STR1## wherein R.sub.1 denotes hydrogen, C.sub.1 -C.sub.4 -alkoxy or C.sub.1 -C.sub.4 -alkoxyethoxy and

Benzisothiazole azo dye for synthetic fibers

Dyestuffs which are highly suitable for use as the blue component in the trichromatic dyeing of polyamide fibre materials have the formula ##STR1## in which R.sub.1 and R.sub.2 denote alkyl, the total number of the C atoms in the radicals R.sub.1 and R.sub.2 being at least three.

Process for trichromatic dyeing polyamide fibres

Azo dyestuffs of the formula ##STR1## wherein R.sub.1 denotes acyl,

Orthotrifluoromethyl containing phenylazonaphthol dyestuffs

Navy polyester dyeings which are produced by means of dyestuff mixtures based on azo dyestuffs from 2,4-dinitro-6-cyanoaniline and 3-acylamino-dialkylaminoanilines are distinguished by a very good wash fastness on using peroxide-containing domestic washing agents. Preferably the dyestuff formulations used contain a weakly acidic buffer system.

Process for preparing navy dyeings on polyester fibers using mixture of

Benzoisothiazole azo dyestuffs

Mixtures of dyestuffs of the formula I ##STR1## and of the formula II ##STR2## wherein R=alkyl,

Dyestuff mixture

Mixtures of disperse dyestuffs

Azo dyestuffs which contain, as the coupling component an indole of the formula ##STR1## wherein R denotes an optionally substituted alkyl radical, an optionally substituted aryl radical or an optionally substituted aralkyl radical, and the benzene ring A can be further substituted, frequently exhibit an undesired irreversible change in the color shade in acid solutions, which surprisingly can be prevented by adding nitrogen-containing complex-forming substances.

Stabilization of anionic indole dyestuffs

A water-soluble monoazo dyestuff which, in the form of the free acid, corresponds to the formula ##STR1## wherein R.sub.1 denotes alkyl which can be mono-substituted by chlorine, hydroxyl, C.sub.1 to C.sub.4 alkoxy, cyano, phenyl or tolyl, cyclohexyl which can be optionally substituted by C.sub.1 -C.sub.4 alkyl, phenyl, C.sub.1 -C.sub.4 -alkyl phenyl, chlorophenyl, bromophenyl, trifluoromethylphenyl or naphthyl, alkenyl or benzenesulphonyl which can be substituted by fluorine, chlorine, bromine, trifluoromethyl, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy,

Water-soluble phenylazoaminonaphthol sulphonic acid dyestuffs

The dyestuff of the formula ##STR1## is suitable for dyeing synthetic polyamide textile materials, in particular for combination dyeings because of its favorable uptake properties.

Dyeing synthetic polyamides

Dyestuffs, which in the form of the free acid of the formula ##STR1## wherein R.sub.1 denotes hydrogen, nitro, cyano, SO.sub.2 --R.sub.7, CONR.sub.8 R.sub.9, SO.sub.2 NR.sub.8 R.sub.9, SO.sub.2 OR.sub.10, COOR.sub.10, SO.sub.2 --NHSO.sub.2 --R.sub.11, sulpho or alkyl,

Water-soluble diphenylamine-azo-sulfatoalkoxyphenyl dyestuffs

Azo dyestuffs of formula ##STR1## wherein R.sub.1 denotes hydrogen, C.sub.1 --C.sub.4 alkyl, Cl, Br, --OCH.sub.3, --OC.sub.2 H.sub.5, --NO.sub.2, --CN, --SCN, --SO.sub.2 CH.sub.3, --SO.sub.2 C.sub.2 H.sub.5, --SO.sub.3 H, --SO.sub.2 NX.sub.2 (X=H or C.sub.m H.sub.2m.sub.+1 with m = 1-4) or --COOC.sub.n H.sub.2n.sub.+1 (n = 0-4);

Growing community of inventors

Leverkusen, Germany

Hans-Gunter Otten