Positively or negatively charged azo compounds containing a ballasting group
US4248772A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 23, 1979 |
| Grant date | Feb 3, 1981 |
| Priority date | — |
| Expiry date | Feb 23, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C8/10
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Novel azo compounds of the general formula EQU (E).sub.n.sbsb.1 (A).sub.n.sbsb.2 --(R.sub.1).sub.n.sbsb.3 --N.dbd.N--BAL are provided, wherein A is a charged group which may be positively or negatively charged, E is a counter ion which carries a charge of opposite sign to that carried by A, BAL represents a ballasting group attached to the azo group via an aromatic or heterocyclic ring which may be further substituted, and R.sub.1 is an optionally substituted aromatic or heterocyclic ring which is present unless A is a charged heterocylic group, and n.sub.1 and n.sub.2 are each 1 or 2, and n.sub.3 is 0 or 1. The compounds are useful in the photographic field, especially in the photographic dye diffusion transfer process for the production of photographic images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.