| 摘要 |
<p>Case 1-12693/= Liquid preparation of an anionic dye of the disazo class A liquid preparation of an anionic dye of the disazo class, which preparation contains the disazo dye, which in the form of the free acid corresponds to the formula dissolved in a solvent mixture which is miscible with water in any proportion and which consists of N,N,N',N'tetramethylurea, at least one alkylene glycol ether and water, and alkyl- or alkanolamine in an amount sufficient to bring the pH value of the liquid preparation to 6.5 to 8.5, the dye being in the form of alkylor alkanolamine. This novel liquid preparation is a concentrated true solution which is stable in storage over several months at temperatures of between about -10.degree.C and +60.degree.C, and which is miscible with cold and warm water in any proportion. It is suitable in particular for dyeing and printing paper, including semi-cardboard and cardboard, the dyeing of these materials being possible, for example, in the pulp, or by brushing or immersion.</p> |
