Concentrated aqueous solutions of cationic colorant and procedure for their preparation
US4264496A · kind A · utility
3Cited by
5References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 15, 1979 |
| Grant date | Apr 28, 1981 |
| Priority date | — |
| Expiry date | Nov 15, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B44/18
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides concentrated aqueous acid solutions of the colorant having the formula: ##STR1## in which A.sup..crclbar. represents the formate, acetate or propionate anion. The solutions are prepared starting with the corresponding chloride or sulfomethylate by forming the m- or p-nitrobenzoate, dissolving said salt in formic, acetic or propionic acid and eliminating the nitrobenzoic acid which is precipitated. The solutions of the invention can be used for coloring and printing fibers containing acid groups, and particularly acrylic fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.