Silver halide photographic material and process for the formatio

Details Silver halide photographic material and process for the formatio Silver halide photographic material and process for the formatio

1988-12-27

1990-04-03

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430446, 430448, 430599, 430600, 430607, 430613, 430614, 430949, G03C 106

Patent

active

049140035

ABSTRACT:
A novel silver halide photographic material is provided comprising at least one light-sensitive silver halide emulsion layer provided on a support and containing at least one hydrazine compound and at least one amine compound of the general formula (I) in said emulsion layer or at least one of other constituting layers, provided that said hydrazine compound and said amine compound can be present in the same or different layers: ##STR1## wherein R.sup.2 and R.sup.3, which can be the same or different, each represents a substituted or unsubstituted alkyl group or R.sup.2 and R.sup.3 may be linked to each other to form a ring; R.sup.4 represents a substituted or unsubstituted alkyl, aryl or heterocyclic group; A represents a divalent linkage group; X represents --CONR.sup.5 --, --OCONR.sup.5 --, --NR.sup.5 CONR.sup.5 --, --NR.sup.5 COO--, --COO--, --OCO--, --CO--, --NR.sup.5 CO--, --SO.sub.2 NR.sup.5 --, --NR.sup.5 SO.sub.2 --, --SO.sub.2 --, --S-- or --O-- group (in which R.sup.5 represents a hydrogen atom or a lower alkyl group having 1 to 5 carbon atoms); and n represents an integer of 0 or 1, with the proviso that the total number of carbon atoms contained in R.sup.2, R.sup.3, R.sup.4 and A is 20 or more. Furthermore, a novel method for forming a superhigh contrast negative image is provided which comprises imagewise exposing a silver halide photographic material comprising at least one silver halide emulsion layer provided on a support and containing at least one hydrazine compound and at least one amine compound of the general formula (I) in said emulsion layer of at least one of other constituting layers to light provided that said hydrazine compound and said amine compound can be present in the same or different layers, and then developing the silver halide photographic material thus exposed with a developing solution having a pH value of 10.5 to 12.0 and containing 0.15 mol/liter or more of sulfite ions.

REFERENCES:
patent: 4429036 (1984-01-01), Hirano et al.
patent: 4447522 (1984-05-01), Hirano et al.
patent: 4581322 (1986-04-01), Ishiguro et al.

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