Bleachable dyes
US4369310A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1980 |
| Grant date | Jan 18, 1983 |
| Priority date | — |
| Expiry date | Oct 22, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/83
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Dyestuffs of the general formula ##STR1## wherein A and B each represent a cyano, acyl or carbalkoxy group save that when A is cyano B cannot be cyano or carbalkoxy, or A and B form together with the carbon atom to which they are attached a carbocyclic or heterocyclic ring system, R.sub.1 is hydrogen, alkyl or alkoxy, R.sub.2 alkyl, R.sub.3, R.sub.4, R.sub.5 each are hydrogen, alkyl, carboxyalkyl, alkoxy-carbonyl-alkyl or aryl, or two of R.sub.3, R.sub.4 and R.sub.5 or all three R.sub.3, R.sub.4 and R.sub.5 may form together with the nitrogen atom to which they are bonded a ring system, Z is a linking group and X.sup..crclbar. an anion. The dyes can be bleached easily and they are suitable as antihalation or filter dyes in photographic materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.