Radiation imagery chemistry: process – composition – or product th – Color imaging process – Using identified radiation sensitive composition in the...
Patent
1978-02-10
1980-05-27
Brown, J. Travis
Radiation imagery chemistry: process, composition, or product th
Color imaging process
Using identified radiation sensitive composition in the...
430 380, 430566, 430577, G03C 700
Patent
active
042048672
ABSTRACT:
White couplers which are capable of reacting with color developer oxidation products to form colorless end product with the consumption of four oxidation equivalents and which, therefore have increased absorption capacity for color developer oxidation products correspond to the formula ##STR1## or its tautomeric form, in which R.sup.1 is hydrocarbyl, heterocyclyl attached through a ring carbon, or --CO--R.sup.2
R.sup.2 is alkyl, aryl, alkoxy, amino
X is --S-- or --NR.sup.3 --
R.sup.3 is hydrogen, same as represented by R.sup.1 or an electron-attaching group.
The four-equivalent white couplers may be contained in processing solutions or, in diffusion resistant form, in one or more layers of a colorphotographic material.
REFERENCES:
patent: 2126337 (1938-08-01), Mannes et al.
patent: 2395846 (1946-03-01), Carroll et al.
patent: 2421693 (1947-06-01), Harriman
patent: 4052213 (1977-10-01), Credner et al.
patent: 4059447 (1977-11-01), Meier et al.
Boie Immo
Haseler Helmut
Kirchhoff Gertrud
Kuffner Karl
Lassig Wolfgang
AGFA-Gevaert A.G.
Brown J. Travis
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