Process for preparation of concentrated anionic red dye solutions
US4654045A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1986 |
| Grant date | Mar 31, 1987 |
| Priority date | — |
| Expiry date | Jan 30, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S8/924
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention is a process for the preparation of concentrated anionic red dye solutions which are storage stable. The process allows manufacture of a solution of a dye having the formula: ##STR1## wherein R.sub.1 is --SO.sub.2 N(CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.3).sub.2, --SO.sub.2 N(C.sub.6 H.sub.5)(CH.sub.2 CH.sub.3), --SO.sub.2 N(CH.sub.3)(C.sub.6 H.sub.11), or --CF.sub.3 ; PA0 R.sub.2 is --H, --Cl or ##STR2## and R.sub.3 is lower alkyl M is ##STR3## wherein R.sub.4 and R.sub.5 are --H or --CH.sub.3 independently and PA0 m+n+q.ltoreq.9, but >0, by reacting a dye having the structure: ##STR4## wherein R.sub.1 is --SO.sub.2 N(CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.3).sub.2, --SO.sub.2 N(C.sub.6 H.sub.5)(CH.sub.2 CH.sub.3), --SO.sub.2 N(CH.sub.3)(C.sub.6 H.sub.11), or --CF.sub.3 ; PA0 R.sub.2 is --H, --Cl or ##STR5## wherein R.sub.3 is lower alkyl, and PA0 X is NH(R.sub.6).sub.3, wherein R.sub.6 is H or a lower alkyl, in a mixture of water and a water soluble organic solvent with a polyhydroxyalkoxyalkylamine having the structure: ##STR6## under conditions which cause expulsion of the volatile amine N(R.sub.6).sub.3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.