Abstract:
A process for the manufacture of blue anthraquinonoid disperse dyes based on 1,5(1,8)-diamino-4,8(4,5)-dihydroxyanthraquinone, wherein 1,5(1,8)-dinitro-4,8(4,5)-dimethoxy-anthraquinone or mixtures of these compounds are reduced, in 20 to 45% strength by weight oleum, with sulfur at -10* to +50*C in the presence of boric acid, and the product of the reduction is brominated in sulfuric acid or 0 to 5% strength by weight oleum or in organic solvents until the product thus obtained contains 12 to 30% by weight of bromine. Dyes which give deep and, in particular, light-fast dyeings, above all on fibrous materials consisting of linear polyesters, are obtained.
Abstract:
IN WHICH ONE X is chloro and the other X is hydrogen or each X is chloro; and WITH AIR OR OXYGEN OR WITH 10 TO 30% BY WEIGHT NITRIC ACID TO FORM THE CORRESPONDING CARBOXYLIC ACID FOLLOWED BY CYCLIZATION OF THE LATTER. 1-CHLOROANTHRAQUINONE-2,3-DICARBOXYLIC ANHYDRIDE OR 1,4-DICHLOROANTHRAQUINONE-2,3-DICARBOXYLIC ANHYDRIDE IS OBTAINED IN A GOOD YIELD. Each is a valuable dye intermediate.
A process for the production of an anthraquinone-2,3dicarboxylic anhydride bearing chlorine as a substituent in the 1-position or in the 1- and 4-positions by oxidation of a trimethyl compound of the formula:
Abstract:
The production of 3,6-dihalodiphenylalkanes by reaction of a diphenylalkane with a halogen and the novel 3,6dihalodiphenylalkanes themselves. The new compounds which can be prepared according to the process of the invention may be used as dispersing agents in dye/styrene mixtures and also as dyeing auxiliaries. They are also valuable starting materials for the production of dyes and pesticides.
Abstract:
Azo disperse dyes containing an N-substituted 3-amino-6nitrophthalimide as diazo component and an aniline coupling component. The dyes give yellow to blue colorations particularly on polyesters; these colorations have good fastness properties. In which
Abstract:
1,4-DIAMINOANTHRAQUINONES BEARING IN POSITION 2 A 1,2,4OXADIAZOLE GROUP WHICH IS SUBSTITUTED IN POSITION 3 BY AN AROMATIC OR ALIPHATIC RADICAL. These anthraquinone derivatives are valuable blue disperse dyes for use in dyeing and printing synthetic textile materials.