Stable concentrated solution of a dye of the disazo class
US4260391A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 1, 1979 |
| Grant date | Apr 7, 1981 |
| Priority date | — |
| Expiry date | Mar 1, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B69/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
There is described a stable concentrated solution of a dye of the disazo class, which solution contains 15 to 30 percent by weight of the dye of the formula ##STR1## in the form of the lithium salt, optionally in admixture with up to 75 percent by weight of the sodium, potassium or ammonium salt, dissolved in 5 to 35 percent by weight of water, 2 to 10 percent by weight of pyrrolidone or of N-alkyl-(C.sub.1 -C.sub.4)-pyrrolidone and 35 to 50 percent by weight of a diethylene glycol monoalkyl ether; a process for producing this liquid preparation, and its use for dyeing and printing cellulose and regenerated cellulose, particularly however for dyeing paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.