Process for the production of photographic images by dye diffusion transfer and photographic material suitable in this process
US4269928A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1979 |
| Grant date | May 26, 1981 |
| Priority date | — |
| Expiry date | Feb 23, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C8/10
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A photographic dye diffusion transfer process is provided which operates by imagwise release of a dye. The dye diffuses to a receiving layer and is mordanted there to give a dye image. The dyes are released from a compound of the formula D--E--F--BAL by reductive cleavage. D is a group which contains the residue of diffusible dye, BAL is a ballasting group which renders the compound containing it substantive to the layer in which it is present, D and E being joined by any type of chemical bond and E and F represent a single or double bond system which links D and BAL and which has a reduction potential above -200 mV measured against a standard hydrogen electrode at a pH of less than 3 and which bond can be reductively cleaved at a pH of less than 3 by a reducing agent which is able to act at a pH below 3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.