High contrast developer containing an aprotic solvent

Details High contrast developer containing an aprotic solvent High contrast developer containing an aprotic solvent

1992-02-18

1993-04-27

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430487, 430493, 430478, 430481, 430482, 430265, 430435, 430440, 430441, 430442, G03C 106

Patent

active

052061230

ABSTRACT:
A method for high contrast development of an image-wise exposed photographic element comprising a support and at least one silver halide emulsion layer, which method comprises contacting said exposed element in the presence of a hydrazine compound with an aqueous alkaline developing solution which has a pH between 10 and 13 and contains a dihydroxybenzene developing agent a 3-pyrazolidinone or an aminophenol developing agent sulphite ions and a contrast promoting amount of an amino compound characterized in that said developing solution further contains an aprotic solvent corresponding to general formula (I) or (II) : ##STR1## wherein R.sub.1 represents alkyl, substituted alkyl, alkylamino or substituted alkylamino, and

REFERENCES:
patent: 4267260 (1981-05-01), Muira et al.
patent: 4740452 (1988-04-01), Okutsu et al.
patent: 4965169 (1990-10-01), Hirano et al.
patent: 5004670 (1991-04-01), Okutsu et al.
patent: 5039591 (1991-08-01), Okutsu et al.

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