Disperse dye stable to dyeing, and its use for dyeing synthetic and semi-synthetic fibre materials
US4327999A · kind A · utility
14Cited by
4References
7Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 31, 1980 |
| Grant date | May 4, 1982 |
| Priority date | — |
| Expiry date | Dec 31, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0029
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
It is possible by heating at temperatures of between 65.degree. and 200.degree. C. to convert the known .alpha.-modification of the azo dye of the formula ##STR1## which is unstable to dyeing, completely into the .beta.-modification which is stable to dyeing. The modification transformation can be performed either with the solid dye or with a suspension thereof in an organic, preferably aromatic, solvent. The novel dye modification is stable in dispersion under dyeing conditions, and shows no tendency to flocculate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.