Global Patent Index - EP 0264192 B1

EP 0264192 B1 19940330 - Direct positive silver halide light-sensitive photographic material.

Title (en)

Direct positive silver halide light-sensitive photographic material.

Title (de)

Direkt positives, lichtempfindliches photographisches Silberhalogenidmaterial.

Title (fr)

Matériau photographique positif-direct à l'halogénure d'argent sensible à la lumière.

Publication

EP 0264192 B1 19940330 (EN)

Application

EP 87308168 A 19870916

Priority

JP 21769186 A 19860916

Abstract (en)

[origin: EP0264192A2] The material comprises a support and a silver halide emulsion layer thereon containing direct positive silver halide grains adapted to form an internal latent image upon imagewise exposure and being unpre-fogged, and a compound represented by general formula [I], <CHEM> wherein Z represents a group of non-metallic atoms necessary to complete a nitrogen-containing heterocyclic ring which may have a substituent; X represents a hydrogen atom or a substituent capable of being split off upon reaction with an oxidation product of a color developing agent; and R represents a hydrogen atom or a substituent. The emulsion has a maximum density which is sufficiently large and a minimum density which is sufficiently small. The foot portion of the density/exposure curve can exhibit high contrast while the highlight portion shows little or no tendency towards magenta color.

IPC 1-7

G03C 1/485; G03C 7/38

IPC 8 full level

G03C 1/485 (2006.01); G03C 7/305 (2006.01); G03C 7/38 (2006.01)

CPC (source: EP)

G03C 1/48538 (2013.01); G03C 7/30529 (2013.01); G03C 7/3825 (2013.01)

Citation (examination)

Designated contracting state (EPC)

DE FR GB IT NL

DOCDB simple family (publication)

EP 0264192 A2 19880420; EP 0264192 A3 19900411; EP 0264192 B1 19940330; DE 3789483 D1 19940505; JP S63184743 A 19880730

DOCDB simple family (application)

EP 87308168 A 19870916; DE 3789483 T 19870916; JP 22697887 A 19870910