Dyeing and printing basic dyeable textile substrates with becationic disazo and trisazo dyes having optionally further substituted 6-hydroxy-4-methyl-3-N-pyridiniumpyridone-2-coupling component radicals
US4087244A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1976 |
| Grant date | May 2, 1978 |
| Priority date | — |
| Expiry date | Jun 29, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S8/927
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed are disazo and trisazo dyes free of sulfo groups which contain two 6-hydroxy-4-methyl-3-N-pyridiniumpyridone-2 coupling component radicals, preferably dyes of the formula ##STR1## wherein R is a tetrazo component radical, PA1 Each R.sub.1 is independently hydrogen, C.sub.1-4 alkyl, C.sub.1-4 hydroxyalkyl or --NR.sub.3 R.sub.4, PA1 wherein each of R.sub.3 and R.sub.4 is independently n-C.sub.1-4 -alkyl, PA1 Each R.sub.2 is independently hydrogen, n-C.sub.1-4 alkyl, n-C.sub.1-4 -hydroxyalkyl or C.sub.1-4 alkoxy, and PA1 Each A.sup.- is an anion. The dyes are useful for dyeing paper and basically dyeable substrates such as polymers and copolymers of acrylonitrile and dicyanoethylene and synthetic polyesters and polyamides modified to contain acid groups. Dyeings on textiles are even and possess good light fastness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.