Anionic dye
US5203912A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1991 |
| Grant date | Apr 20, 1993 |
| Priority date | — |
| Expiry date | Jun 24, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0055
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A dye which, in the free acid form, has the formula ##STR1## wherein W is COOH PA1 X is selected from H, COOH, SO.sub.3 H, halo, hydroxy, nitro, cyano, C.sub.1-6 -alkyl, C.sub.1-6 -alkoxy and C.sub.1-6 -acylamino; PA1 Y is H, COOH or SO.sub.3 H; PA1 Z is H, COOH or SO.sub.3 H; PA1 R & R.sup.1 are each independently H or C.sub.1-6 -alkyl substituted by 0, 1 or 2 --COOR.sup.2 groups; and PA1 R.sup.2 is H or C.sub.1-6 -alkyl; provided that there are at least two COOH groups and that the number of COOH groups is equal to or greater than the number of SO.sub.3 H groups. The dye is adapted for the preparation of inks for use in ink jet printing in which it displays high water-fastness on paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.