Radiation imagery chemistry: process – composition – or product th – Transfer procedure between image and image layer – image... – Diffusion transfer process – element – or identified image...
Patent
1979-02-23
1981-05-26
Schilling, Richard L.
Radiation imagery chemistry: process, composition, or product th
Transfer procedure between image and image layer, image...
Diffusion transfer process, element, or identified image...
430223, 430242, 430390, 430392, G03C 554, G03C 700, G03C 140, G03C 110
Patent
active
042699282
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.
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patent: 3574621 (1971-04-01), Schaller et al.
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Kitzing Rainer
Long William E.
Mason Leslie F. A.
Reeves David L. R.
Whitear Brian R. D.
Ciba-Geigy Aktiengesellschaft
Schilling Richard L.
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