摘要:
Liquid finished formulations which are stable to storage and hydrolysis and are based on the lyotropic liquid crystal aqueous phase of the dyestuff of the formula ##STR1## which is present in water in a concentration of 23-35% at room temperature, are outstandingly suitable for the preparation of dyebaths and printing pastes for dyeing cotton, wool, regenerated cellulose, paper and leather.
摘要:
Liquid finished formulations which are stable to storage and hydrolysis and are based on the lyotropic liquid crystal aqueous phase of the dyestuff of the formula ##STR1## in water in a concentration of 12-35% at room temperature are outstandingly suitable for the preparation of dyebaths and printing pastes for dyeing cotton, wool, regenerated cellulose, paper and leather.
摘要:
The lyotropic, liquid-crystalline, aqueous phase of a reactive dyestuff of the formula ##STR1## wherein M.sym. represents H.sym. or an alkali metal cation (preferably Na.sym., K.sym. or Li.sym.) andR is a fibre-reactive groupingpresent in water at room temperature in a concentration of 10-25%, if appropriate in the presence of concentration-increasing additives and/or buffer substances, is highly suitable for preparing dyebaths and print pastes for application to natural and synthetic substrates, in particular cotton, wool, regenerated cellulose, paper and leather.
摘要:
Process for the manufacture of pigment preparations by comminution in the presence of surface-active agents which can be saponified under acid or alkaline conditions and which contain at least one group which confers solubility in a radical which is to be split off during the saponification.
摘要:
Leather dyeing agents, which can be obtained by concentrating, by means of a membrane separation process, the mother liquors, which are produced in the salting-out process in the preparation of organic dyestuffs which are water-soluble or which contain groups imparting water-solubility, the mother liquors having an extinction in the absorption maximum which is .gtoreq.500, with a layer thickness of 10 cm, and by drying the concentrate, if appropriate.
摘要:
Highly concentrated liquid preparations of disperse dyestuffs are obtained with a low consumption of energy by first adding a dispersing agent to the water-moist dyestuff press-cake to convert it into a form in which it is capable of flow, subjecting this product to wet grinding and increasing the dyestuff content of the resulting, insufficiently concentrated dispersion in a second step by means of a membrane separation process, for example pressure permeation.
摘要:
Chemical reaction products, obtained in an alkaline medium and which require the addition of a dispersing agent, are neutralized by addition of a free surface-active acid to which, after its preparation, basic agents have not been added or have only been added up to a pH value of 3.
摘要:
Pressing of uniform shape and uniform weight of disperse dyestuffs and optical brightening agents with a solubility in water less than 0.5% at 20.degree.C which are suitable for an automate metering step and which disintegrate in aqueous dye baths to give dispersions are manufactured by compressing the dyestuff or brightening agent, an anionic dispersing agent and a solid water-soluble mould release agent which gives a neutral to weakly alkaline reaction in water.
摘要:
Sifting is improved by the installation of one or more nozzles in the longitudinal axis of a drier. A spray-dried granulate is thereby substantially freed from dust. The effect of heat on low melting products is reduced by cooling the gas.
摘要:
Organic pigments which provide an opaque color impression in binders and exhibit adequate flow properties in binders are obtained from pigments which provide a transparent color impression in binders in a simple way in that an azeotrope-forming agent which is appropriate for the liquid adhering to the pigment is added to the moist pigment obtained after the preparation, and the azeotropic mixture and any excess solvent which may be present are then distilled off.