Abstract:
The invention relates to a method for producing a liquid formulation of salts of sulphonic-acid azo dyes by the coupling of one at least equimolar quantity of diazotized amino aryl sulphonic acids of formula (I), H2N - Ar - SO3H, to the coupling product of a self-coupled phenylenediamine, which can be optionally substituted by methyl. In said formula, Ar represents phenylene, which can be monosubstituted by sulpho, or naphthylene, which can be monosubstituted or disubstituted by sulpho and/or monosubstituted by hydroxy. According to the method, the azo dye is dissolved in a basic solution and the mixture is then subjected to a nanofiltration.
Abstract:
The invention relates to aqueous liquid formulations containing 5 to 30 percent by weight of a dye composition that comprises 25 to 85 percent by weight of direct brown 44, 15 to 75 percent by weight of direct yellow 11 and/or a dye obtained by reducing or thermally treating direct yellow 11, 0 to 15 percent by weight of one or several direct blue dyes, and 0 to 10 percent by weight of one or several direct red dyes, the percentages being relative to the dye composition, 0.5 to 15 percent by weight of one or several alkylamines, the one, two, or three alkyl radicals of which can be substituted by one or two hydroxyl groups and/or amino groups and/or be interrupted by one or two oxygen atoms having an ether function, said percentages being in relation to the total weight of the aqueous liquid formulation, the Na concentration of the liquid formulation not exceeding 0.3 percent by weight. Also disclosed is the use of the inventive aqueous liquid formulations for dyeing cellulose material, especially paper.
Abstract:
The invention relates to a method for producing pigment preparations, which method is characterized by dispersing in an apparatus (a) at least one pigment in the presence of (b) at least one emulsions copolymer having an average molecular weight Mw of at least 150.000 g/mol, which comprises at least one C1-C10 alkylester or at least one ω-hydroxy-C2-C4 alkylene ester of at least one ethylenically unsaturated C3-C10 carboxylic acid or at least one vinyl-aromatic compound polymerized into it, and (c) water.