Liquid preparation of an anionic dye of the disazo class
US4336026A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 19, 1981 |
| Grant date | Jun 22, 1982 |
| Priority date | — |
| Expiry date | Jan 19, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S8/924
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
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 ##STR1## 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 alkyl- or 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.