Radiation imagery chemistry: process – composition – or product th – Post imaging processing – Developing
Patent
1992-02-05
1993-03-23
Van Le, Hoa
Radiation imagery chemistry: process, composition, or product th
Post imaging processing
Developing
430435, 430446, 430464, 430483, 430490, G03C 524
Patent
active
051962985
ABSTRACT:
A photographic developing solution for immersion development is disclosed showing a pH of at least 12.0 and containing more than 0.4 moles/liter of a sugar derivative, or an alkali metal salt thereof, corresponding to general formula (I): ##STR1## wherein X represents an oxygen atom or an imino group, and n represents a positive integer from 1 to 4, and R represents a hydroxy group when n is 1, and R represents a hydroxy group or a hydrogen atom when n is 2 to 4.
Preferred sugar derivatives according to the present invention are l-ascorbic acid and iso-ascorbic acid. In a most preferred embodiment there are substantially no other developing agents and no sulphite ions present. When developing a graphic arts photographic material lith quality is obtained. The disposal of depleted solutions can be performed in an ecologically safe way.
REFERENCES:
patent: 2688549 (1954-09-01), James et al.
patent: 3730727 (1973-05-01), Olivares et al.
patent: 3770446 (1973-11-01), Sato et al.
patent: 3826654 (1974-07-01), Weiss et al.
patent: 3938997 (1976-02-01), Finch et al.
patent: 5098819 (1992-03-01), Knapp
De Rycke Gino L.
Meeus Pascal F.
Willems Peter M.
Agfa-Gevaert N.V.
Le Hoa Van
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