Cassella Aktiengesellschaft

Cassella Farbwerke Mainkur Aktiengesellschaft

Hoechst Aktiengesellschaft

Farbwerke Hoechst Aktiengesellschaft

Joachim Ribka

Ernst Heinrich

Wolfgang Bauer

Friedrich Engelhardt

Wolfgang Rieper

Horst Tappe

Karl Hintermeier

Kurt Roth

Ulrich Buhler

Klaus Hunger

Karl-Heinz Keil

Rolf Muller

Helmut Beutler

Horst Kindler

Heinz Dickmanns

Gert Nagl

Juliane Balzer

Karlfried Keller

Hans-Jurgen Weyer

Edwin Humuller

Konrad Mix

Ulrich Gotsmann

Erwin Krusche

Hans-Ulrich Von Der Eltz

Fritz Engelhardt

Walter Dursch

Alwin K Reng

Jochen M Quack

Bernhard Mees

Reinhard Hahnle

Walter Rupp

Joachim W Lehmann

Heinrich Frolich

Kuno Reh

Theo Stahl

Dieter Tichy

Steffen Piesch

Friedrich Wilhelm Weingarten

Siegfried Schwerin

Reinhard Zunker

Manfred Schon

Walter Kunstmann

Volker Kohler

Kurt Rosenbusch

Norbert Armbrecht

Joachim Valentin

Erwin Ungermann

Gustav Hudec

Wolfram Schidlo

Heinz Helling

Siegfried Wirth

Gunter Laubert

Christian Heid

Helmut Richter

Otto Trosken

Gerhard Weckler

Hans Gattner

Gert Brachten

Erwin Herrmann

Wolfgang Bodenstedt

Peter Dorries

Eberhard Stier

Ralf Zimmermann

Konstantin Morgenroth

Azo dyestuff free from groups imparting solubility in water are used in the process for the production of white or variously colored designs on a colored substrate on textile material wherein the dyestuff is dischargeable to white and is of the formula

Azo dyestuff dischargeable to white

Leathers can be advantageously dyed with water-soluble polyazo dyestuffs having, in the form of the free acid, the formula ##STR1## wherein A is a member of the benzene, naphthalene or heterocyclic series;

Dyestuff containing at least three azo bridges

Process for the aftertreatment of the azo pigment of the formula ##STR1## C.I. PIGMENT ORANGE 36 wherein the crude pigment obtained after coupling is heated to temperatures from 100.degree. to 150.degree. C. in dry or wet condition in a solvent which is water-immiscible or not indefinitely water-miscible and the pigment is isolated in known manner. The pigment aftertreated in this way shows substantially improved hiding power while the same pigment prepared in the usual way has poor hiding power and can not be used in stoving lacquers.

Azo pigment having improved hiding power and a process for its

Dyestuffs of the formula ##STR1## are used for coloring organic solvents, mineral oil products, waxes, plastics and surface coatings, wherein R is alkyl having 1 to 7 carbon atoms, R.sup.1 is alkyl having 1 to 8 carbon atoms or alkenyl having 3 or 4 carbon atoms, and R.sup.2 is hydrogen, alkyl having 1 to 8 carbon atoms or alkenyl having 3 or 4 carbon atoms.

Process for coloring organic solvents, mineral oil products, waxes,

Azo dyestuffs free from groups imparting solubility in water are used in the process for the production of white or variously colored designs on a colored substrate on textile materials containing hydrophobic, synthetic fibers by impregnating the materials with dye liquors containing dyeing auxiliaries and padding auxiliaries as well as dyestuffs which are dischargeable to white, drying or incipiently drying the impregnated materials, printing the materials with an alkaline discharge reserve paste which contains a discharging agent, and subsequently subjecting the materials to a heat treatment at temperatures from 100.degree. to 230.degree. C., wherein said discharging agent is a base which produces a pH value of at least 8 in a 5% strength aqueous solution and the dyestuffs which are dischargeable to white are of the formula

Process for dyeing and printing synthetic, hydrophobic fibre material

In the process for production of discharge reserve prints on textile material comprised of water-repellent fibers or water repellent fibers mixed with cellulose fibers, wherein a disperse dyestuff which is dischargeable to white is applied in the form of a dye liquor or printing paste to the textile material after which said material is dried or incipiently dried, and a discharge reserve printing paste is printed on the material in the desired pattern, and the thus treated material is subsequently subjected to a heat treatment at temperatures of 100.degree. to 230.degree. C., the improvement comprises said disperse dyestuff which is dischargeable to white is a dyestuff of the formula ##STR1## as more fully defined herein and wherein said discharge reserve printing paste contains, as the discharging agent, a base which produces a pH value of at least 8 in a 5% strength aqueous solution.

Process for producing discharge reserve prints on textile materials

The aqueous dyestuff formulation of an tetrakisazo direct dyestuff which is stable to alkali and contains at least one aromatic hydroxyl group and/or enol group and at least one group conferring solubility in water, or a mixture of such azo direct dyestuffs, is characterized in that it has a pH value equal to or greater than 12 and is prepared by mixing an azo direct dyestuff which is stable to alkali, water and a tertiary alkali metal phosphate and/or alkali metal metasilicate and/or alkali metal hydroxide, and by choosing the proportions such that the dyestuff formulation contains 5 to 50% by weight of dyestuff and has a pH value equal to or greater than 12. The dyestuff formulation is used, after dilution with water, for dyeing and printing natural or synthetic materials containing hydroxyl groups.

Aqueous dyestuff formulation, a process for its preparation and its use

Hazy or frosty appearance of mixtures of polyester and cellulosic fibers when dyed with disperse dyes is suppressed by adding to the aqueous dye bath a small amount of low copolymer of acrylamide or the like with a water-soluble maleic or fumaric acid ester, and with or without an additional water-soluble vinyl compound, all as defined infra. The copolymer is normally a liquid miscible with water in all proportions at 10.degree. C. or below. Disperse dye is fixed to the polyester fibers by heating as in the Thermosol process. Dyes for the cellulosic fibers can also be included in the dye bath so that the cellulosic fibers are also dyed in the same treatment. Alternatively the cellulosic fibers can be separately dyed, preferably after the polyester fibers are dyed.

Dyeing of mixed fibers

Azo dyes are very simply made in high purity and very good yield by coupling a diazonium compound with a coupling compound in a mixture essentially of water with a simple alkanol having four to six carbons and soluble in water to the extent of not over about 15% by weight at 15.degree. C. This procedure is particularly effective with compounds that are ordinarily difficult to couple.

Azo coupling in two-phase water-alcohol mixtures

Improved polyesters soluble or dispersible in water having an apparent average molecular weight of 800 to 5,000 and containing phosphonic ester moieties are useful as levelling auxiliaries for uniform dyeing and are produced by esterifying dibasic acids and dihydric alcohols, either or both of which contain phosphonic acid moieties, phosphonic acid ester moieties or both.

Polyester which is soluble or dispersible in water, a process for its

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

In the process for production of resist effects on textile materials of mixed fibers of polyester and cellulose comprising impregnating the materials with a dye liquor containing disperse dyestuffs and reactive dyestuffs which react with the resisting agents, drying or partially drying the padded materials and subsequently printing a resist paste on the material, and heat-treating the materials the improvement comprises the dischargeable disperse dyestuffs being of a class of dyestuffs of which an exemplary species is ##STR1## one of the tautomeric forms of a class of dyestuffs of which an exemplary species is ##STR2## or disperse dyestuffs which are free from groups conferring solubility in water and which contain at least two carboxylic acid ester moieties.

Process for the production of resist effects on polyester/cellulose

A water-soluble monoazo dyestuff useful for dyeing or printing natural or synthetic material containing hydroxyls and nitrogen has the formula ##STR1## or a tautomeric form thereof, wherein R.sup.1 is methyl, ethyl or 6-methyl-7-sulphobenzthiazol-2-yl, R.sup.2 is methyl, methoxy or ethoxy, R.sup.3 is methyl or ethyl, R.sup.4 and R.sup.5 may be the same or different and are hydrogen, methyl or ethyl, M is hydrogen, alkali metal or ammonium and n is 0 or 1.

Water-soluble monoazo dyestuffs

White patterns on synthetic fiber textiles or patterns of a different color on a colored background are produced by dyeing the material with a dyestuff dischargeable to white, drying the material, printing the material with a discharge resist paste and heating the treated material to 100.degree.-230.degree. C. wherein the discharge agent is a base which produces a pH of at least 8 in a 5% strength aqueous solution.

Process for dyeing and printing synthetic hydrophobic fiber material

Process for dyeing evenly synthetic fiber materials and mixtures thereof with natural fibers, with water-insoluble disperse dyestuffs according to the exhaust method, which comprises adding water-soluble or dispersible linear polyesters that have been obtained by polycondensation of dicarboxylic acids with diols, including sulfo-groups-containing chain links, with an average molecular weight of 800 to 5,000, combined with surface-active oxethylation products, at a blend ratio of 1:0.25 to 1:1.5, as dispersing system with levelling action to the aqueous dyeliquors, besides said dyestuffs and pH-controlling substances.

Process for dyeing evenly synthetic fibrous materials

Growing community of inventors

Offenbach am Main, Germany

Joachim Ribka