Cassella Aktiengesellschaft

Clariant Corporation

Hoechst Aktiengesellschaft

Gert Nagl

Wolfgang Bauer

Joachim Ribka

Hans-Tobias Macholdt

Heinz Dickmanns

Ulrich Gotsmann

Manfred Urban

Karl-Heinz Keil

Klaus Kuhlein

Willi Steckelberg

Dieter Schnaitmann

Hubert Kruse

Leonhard Unverdorben

Josef Ritter

Peter Kempter

Klaus Sternberger

Klaus Delpy

Lothar Schlosser

Wilhelm Mauelshagen

Jan-Hilbert Mast

Joachim Steinbach

Manfred Kaiser

Process for preparing dioxazine compounds

The present invention relates to a process for the preparation of dioxazine derivatives of the formula I ##STR1## in which R.sup.1 is hydrogen or (C.sub.1 -C.sub.8)-alkyl, by ring closure of a compound of the formula II ##STR2## in the presence of a ring-closure agent, wherein the ring-closure agent used is an N-hetarene N-oxide. The compounds of the formula I are used for producing valuable dyes and pigments.

Process for the preparation of dioxazine compounds

Process for preparing N-alkylcarbazoles The present invention relates to a process for preparing N-alkylcarbazoles of the formula I ##STR1## where R.sup.1 is (C.sub.1 -C.sub.6)-alkyl and

Process for preparing N-alkylcarbazoles

The black water-soluble sulphur dyes of the formula ##STR1## in which, for example, F is the dye chromophore of C.I. Leuco Sulphur Black 1,

Water-soluble sulphur dyes, their preparation and use

Aryl and aralkyl sulfide, sulfoxide or sulfone compounds as charge

The present invention relates to compounds of the general formula I ##STR1## wherein A.sup..sym. and B.sup..sym. independently of one another denote a proton, with the limitation that they do not both simultaneously denote protons, the equivalent part of the barium ion, an ion of the general formula II ##STR2## or an ion of the general formula III ##STR3## and wherein R.sup.1 to R.sup.8, R.sup.11 to R.sup.16, X and m and n are as defined in the description, processes for their preparation and their use as charge control agents in toners and developers and as charge improving agents in powders and varnishes.

Aryl sulphide, aryl sulphoxide and aryl sulphone compounds

The present invention relates to a process for dyeing leather by the exhaust method, characterized in that water-insoluble sulphur dyes in dispersed form are used.

Dyeing leather with water-insoluble sulphur dyes

The wet-fastness properties of cellulose materials dyed with sulfur dyestuffs is improved by treating the cellulose materials, before, during or after dyeing, with a polymer which is a copolymer or homopolymer of a monomer of the formula ##STR1## wherein R.sup.1 and R.sup.2 denote, for example, hydrogen or (C.sub.1 -C.sub.22)-alkyl; R.sup.3 and R.sup.4 denote hydrogen or methyl; and Y.sup..crclbar. denotes, for example, a monovalent anion.

Wet-fastness properties of sulphur dyestuffs dyeings on cellulose

Preparation of phthalocyanine sulphur dyestuffs is improved by reducing phthalocyaninesulphochlorides in the presence of hydriodic acid and a non-free metal reducing agent which converts iodine into hydriodic acid.

Process for the preparation of sulphur dyestuffs of the phthalocyanine

An improved process for preparation of a condensed product of phenothiazine and p-nitrosophenol which contains more than 60% by weight of indophenol S-oxide of the formula ##STR1## by condensing phenothiazine with p-nitrosophenol in sulphuric acid wherein the improvement comprises the phenothiazine being in 60 to 90% strength sulphuric acid at the time of addition of the p-nitrosophenol.

Process for the preparation of a condensation product from phenothiazine

Green sulfur dyestuff is produced by reacting phenothiazine in sulfuric acid with an oxidizing agent, condensing the oxidized phenothiazine with p-nitrosophenol and thionating with sulfur and sodium sulfide the condensate in a bake or reflux process.

Condensation product from phenothiazine and p-nitrosophenol, process for

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Niederdorfelden, Germany

Gert Nagl