Abstract: Bisdiazonium salts of the formula (1) ##STR1## in which R denotes a linear or branched alkyl or alkoxyalkyl radical having 3-5 carbon atoms and X.sup.- represents the radical of a strong acid or of a zinc chloride double salt, and a process for their preparation by diazotizing a 4,4'-diamino-3,3'-dialkoxybiphenyl of the formula (2) ##STR2## in which R has the meaning mentioned, in an aqueous, strong, non-oxidizing inorganic or organic acid at temperatures from about -10.degree. C. to about +40.degree. C. by means of an alkali metal nitrite, and precipitating the resulting bisdiazonium salts by adding an alkali metal chloride, bisulfate, monosulfonate of 1,5-naphthalenedisulfonic acid or tetrafluoroborate or zinc chloride.These salts are useful in dyeing and printing textile fiber materials by the methods of the ice color technique, using suitable coupling components; they are also useful for preparing photographic tracings by the methods of reprography.

Abstract: The invention relates to 4,4'-diaminodiphenyl compounds of the formula I ##STR1## in which X denotes the n-propyl, isopropyl, n-butyl, isobutyl, 1-methylpropyl, n-propoxy, isopropoxy, isobutoxy, 1-methylpropoxy or 2-methoxyethoxy radical and A is 0 or the equivalent of an inorganic acid.The preparation is effected by reducing ortho-X-substituted nitrobenzene and benzidine rearrangement of the resulting hydrazobenzene derivative. The compounds of the formula (I) are suitable for use as components in the preparation of dyes and pigments.

Abstract: Coloring natural or synthetic fiber material containing hydroxyls or nitrogen is achieved by printing or dyeing the fiber material with a water-soluble disazo dyestuff of the formula ##STR1## wherein R.sup.1 is alkyl, alkoxy or alkoxyethoxy, each having 3-6 carbon atoms, B.sup.1 is the radical of a 1-amino-8-hydroxynaphthalene monosulphonic or disulphonic acid and B.sup.2 is the same as B.sup.1 or another napthyl moiety.

Abstract: An improved process for the manufacture of a monoazo acetoacetylaminobenzimidazolone pigment of the formula ##STR1## by coupling the components in an aqueous medium in the presence of an oxethylation product of an alcohol or alcohol mixture having from 8 to 14 carbon atoms and 3 to 10 mols of ethylene oxide, and heating the aqueous pigment suspension after complete coupling. The pigment thus obtained avoids an after-treatment in anhydrous organic solvents and has good tinctorial strength, high hiding power and good properties with respect to flow and dispersibility.

Abstract: Process for improving the application properties of disazo pigments obtained by coupling bis-diazotized chlorine-substituted 4,4'-diaminobiphenyls with acetoacetylaminobenzenes, which includes adding sulfite ions to the pigment suspension obtained in the coupling and then heating for one half to two hours at 50.degree. to 100.degree. C. The process produces, above all in large scale industrial batches, a product of uniform quality and having acceptable fastness to solvents, overlacquering, migration and bleeding.

Abstract: Using the method of azoic dyeing, fast blue dyeings are obtained when the bis-diazotable diazo component used is a compound of the general formula (1) ##STR1## in which R is a straight-chain or branched alkyl group of 3 to 5 carbon atoms or a (C.sub.1 -C.sub.3)-alkoxy-(C.sub.2 -C.sub.4)-alkyl group having straight-chain and/or branched alkyl groups of in total 3 to 5 carbon atoms, and the coupling component used is a compound conforming to the general formula (2) ##STR2## in which Z stands for a hydrogen atom or a halogen atom or an alkoxy group of 1 to 4 carbon atoms and Aryl denotes a phenyl radical or a 1-naphthyl radical which can be substituted by 1, 2 or 3 substituents from the group consisting of halogen, nitro, alkyl of 1 to 4 carbon atoms and alkoxy of 1 to 4 carbon atoms, and the coupling reaction and dye formation on the fiber are carried out at a pH value between 4 and 10.

Abstract: Disazo compounds of the formula I ##STR1## in which X and Y are identical or different and denote hydrogen, bromine, chlorine, methyl, methoxy, ethoxy, nitro, trifluoromethyl, carbomethoxy or carboethoxy, A.sup.1 and A.sup.2, independently of each other, represent hydrogen, methyl or ethyl and Z.sup.1 and Z.sup.2 in the 6- or 7-position of the heteroaromatic ring system, independently of each other, represent hydrogen, bromine, chlorine, methyl, methoxy, ethoxy, carbomethoxy, carboethoxy or nitro, are obtained by coupling a monodiazotized p-diaminobenzene substituted by X and Y analogously to the formula I with a 5-acetoacetylaminobenzimidazolone which carries the radicals A.sup.1 and Z.sup.2 analogously to the formula I, and reacting the resulting aminoazo compound after another diazotization with a 5-acetoacetylaminobenzimidazolone which carries the radicals A.sup.2 and Z.sup.2 analogously to the formula I, to give the disazo compound of the formula I.

Abstract: The invention relates to aminoazo compounds of the formula I ##STR1## in which X and Y are identical or different and denote hydrogen, chlorine, bromine, methyl, methoxy, ethoxy, nitro, trifluoromethyl, carbomethoxy or carboethoxy, A represents hydrogen, methyl or ethyl, and Z in the 6- or 7-position of the heteroaromatic ring system is hydrogen, chlorine or bromine, methyl, methoxy, ethoxy, carbomethoxy, carboethoxy or nitro.The compounds of the formula I are prepared by coupling a monodiazotized p-diaminobenzene substituted by X and Y analogously to the formula I with a 5-acetoacetylaminobenzimidazolone which carries the radicals A and Z analogously to the formula I. In the case where X, Y or Z does not denote a nitro group, it is possible to use in place of the p-diaminobenzene derivative a p-aminonitrobenzene derivative which is disubstituted by X and Y in the 2- and 5-positions.

Abstract: Diaryl pigments having an excellent stability to heat are obtained by carrying out the coupling of bis-diazotized 3,3'-dichloro-4,4'-diaminobiphenyl with acetoacetanilides in the presence of an added quantity of acetoacetanilides which are monosubstituted or disubstituted in the 3-position or 4-position of the nucleus. As a result of their good heat stability, these pigments are particularly suitable for pigmenting plastics having processing temperatures above 200.degree. C.

Abstract: Azo pigments are obtained by diazotizing a diazotizable aromatic amine without solubilizing groups in anhydrous dipolar aprotic water-miscible solvents with the stoichiometric amount or a small excess of nitrosylsulfuric acid or nitrosyl chloride, coupling the diazonium compound so obtained with a coupling component and isolating the pigment obtained in usual manner. This process is carried out in homogeneous solution and yields azo pigments the advantageous properties of which cannot be achieved by other methods, for example, the excellent purity, grain softness, narrow range of particle size distribution, excellent dispersibility in plastic materials and color lacquers, high gloss and excellent opacity in color lacquers.

Abstract: The invention relates to a process for improving the application properties of Pigment Yellow 13. The crude pigment is heated in an aqueous suspension to temperatures above 100.degree. C. Pigment Yellow 13 thus obtained is particularly suitable for replacing lead-containing chrome yellow pigments of comparable shade.

Abstract: When diazotizing lower alkyl esters of 3-nitro-4-aminobenzoic acid and coupling them onto 5-(2'-hydroxy-3'-naphthoylamino)-benzimidazolone-(2) which may be substituted in 6'-position by chlorine or bromine, in 1-position by methyl or ethyl and in the benzo-nucleus by chlorine, bromine, methyl, ethyl, methoxy or ethoxy, and such as further illustrated by a representative formula ##STR1## wherein R is alkyl of 1 to 4 carbon atoms, X is hydrogen, chlorine, bromine, methyl, ethyl, methoxy or ethoxy, Y is hydrogen, methyl or ethyl, and Z is hydrogen, chlorine or bromine. Colorants are obtained which are especially useful for pigmenting plastics, spinning masses, printing inks, varnishes and paints. The dyeings obtained therewith are fast to light, weathering, solvents and migration, especially fast to overvarnishing and bleeding.

Abstract: When diazotizing a p-amino-benzoic acid anilide, the anilide nucleus of which is substituted in its paraposition by carbamoyl, acetamino or chloro and coupling it onto 5-acetoacetylamino-benzimidazolone-(2) monoazo pigments are obtained having a high fastness to light, solvents, overlacquering and bleeding and a very high heat resistance.

Abstract: 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.

Abstract: 2,5-Bis-(4'-aminophenyl)-1,3,4-oxadiazoles which are chlorinated in the phenyl nuclei are obtained by condensing hydrazine or a hydrazine yielding agent with equal or different chlorinated benzoic acids or acylating acid derivatives having in para-position to the acid group an amino group or a group capable of being transformed into the amino group, and, thereafter, effecting ring closure of the so-obtained bis-hydrazide to yield the oxadiazole. The products are bis-diazo components, especially for pigments having a very high tinctorial strength, clear and pure shades, a good fastness to light, to heat and to solvents.

Abstract: The compound of the formula: ##STR1## is a valuable pigment of high fastness properties and high covering power.

Abstract: When diazotizing a benzanilide of the formula ##STR1## wherein R is methoxy and X is carbamoyl or acetamino and coupling it onto 5-acetoacetylaminobenzimidazolone-(2), a monoazo pigment is obtained having the formula ##STR2## wherein R is methoxy and X is carbamoyl or acetamino. The monoazo pigments are effective for coloring plastics and lacquers and exhibit a very good fastness to light, solvents, over-lacquering, bleeding and have a high heat resistance.

Abstract: When diazotizing a p-amino-benzoic acid anilide, the anilide nucleus of which is substituted in its para-position by carbamoyl, acetamino or chloro and coupling it onto 5-acetoacetylamino-benzimidazolone-(2) monoazo pigments are obtained having a high fastness to light, solvents, overlacquering and bleeding and a very high heat resistance.

Abstract: When diazotizing a benzanilide of the formula ##STR1## wherein R is chloro, methyl or methoxy and X is carbamoyl or acetamino, or, when R is chloro or methyl, X is also methyl or chloro, and coupling it onto 5-acetoacetylaminobenzimidazolone-(2), monoazo pigments are obtained which are useful for coloring plastics and lacquers. The pigments have a very good fastness to light, solvents, over-lacquering, bleeding and a high heat resistance.

Abstract: Valuable pigments are obtained by diazotizing 1-aminobenzene-2-(carboxylic acid methyl or ethyl ester)-5-(2',3'-dichloro-anilide) and coupling it onto 1-(2'-hydroxy-3'-naphthoylamino)-4-acetamino-benzene. The resulting pigments are then subjected to a thermal aftertreatment. These pigments show a high tinctorial strength, a pure shade, a high fastness to migration, especially to overlacquering, to light and weathering and a high heat stability.