摘要:
Process for the production of granular mixtures of vat dyestuffs and/or disperse dyestuffs, characterized in that liquid or pasty, finished formulations of two or more vat dyestuffs and/or disperse dyestuffs are spray-dried together to form granules.
摘要:
Dyestuff dispersions and dyestuff solutions free from salt or at least having a low salt content are obtained in that the diazotization is carried out with addition of free dispersing agent acid to which, after the synthesis, either no basic agents are added or basic agents are added only up to a pH value of 3. The disclosed process gives dyestuff compositions of low salt content and results in readily dispersible dyestuffs when water insoluble dyestuffs are prepared and stable solutions when water soluble dyestuffs are prepared. The process is widely applicable and chemical constitution of the dyestuffs is conventional.
摘要:
The effluent produced in the production of copper phthalocyanine according to the usual methods, containing by-products of the reaction and copper and molybdenum salts is advantageously purified by bringing it to a pH of between 3 and 9 and separating off the precipitate. The precipitate can be added to the starting components of the copper phthalocyanine production.