Concentrated aqueous dye compositions containing a low molecular weight amide and their use for dyeing paper
US4023924A · kind A · utility
4Cited by
9References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 23, 1973 |
| Grant date | May 17, 1977 |
| Priority date | — |
| Expiry date | May 23, 1993 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/28
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Concentrated, liquid preparations of metal-free direct azo dyes which contain in each instance 1 part by weight of dye, 1 to 8 parts by weight of water, and 0.5 to 5 or preferably 0.5 to 2 parts by weight of an amide are useful for dyeing paper in the stock and for dyeing paper sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.