Radiation imagery chemistry: process – composition – or product th – Nonradiation sensitive image processing compositions or... – Developer
Patent
1992-04-30
1993-05-11
Van Le, Hoa
Radiation imagery chemistry: process, composition, or product th
Nonradiation sensitive image processing compositions or...
Developer
430438, 430481, 430482, G03C 530
Patent
active
052100103
ABSTRACT:
There is described a concentrated developer solution which comprises from about 20 to about 60 g/l of dihydroxybenzene developing agent, preferably hydroquinone, from about 0.5 to about 3.0 g/l of an auxiliary developing agent, preferably 1-phenyl-3 pyrazolidinone, from about 300 to about 500 g/l of potassium sulphite and which is buffered to a pH of from about 8 to about 10 with a buffering agent other than an alkanolamine and which comprises sufficient organic solvent other than an alkanolamine to dissolve the hydroquinone.
Such a concentrated developing solution which contains a high concentration of potassium sulphite has when diluted a long useful life and produces images of low graininess.
REFERENCES:
patent: 2753265 (1956-07-01), Kendall et al.
patent: 3178284 (1965-04-01), John et al.
patent: 4987060 (1991-01-01), Mardresano
patent: 5041363 (1991-08-01), Sakuma
Ilford Limited
Le Hoa Van
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