US 5,037,726 AGranted

Method for forming a direct positive image from a material comprising a nucleation accelerator

AssigneeFuji Photo Film Co., Ltd.

InventorsTetsuro Kojima, Noriyuki Inoue

Life of this patent

Estimating the term…

Loading patent…

Abstract

A method for forming a direct positive image having a high Dmax and a low Dmin, which comprises image-wise exposing a photographic light-sensitive material having on a support at least one photographic emulsion layer containing unprefogged internal latent image-type silver halide grains and developing the photographic light-sensitive material after or while fogging to form direct positive image, wherein the aforesaid development is performed in the existence of at least one compound selected from the group consisting of compounds represented by formula (I), (II), (III), (IV), (V) or (VI), acid salts of compounds represented by formula (I) to (IV) provided substituents thereof contain an amino group, and acid salts of compound represented by formula (V) or (VI); ##STR1## wherein symbols are defined as in claim 1.

Claims17

Dependent claims

A method for forming a direct positive image, which comprises imagewise exposing a photographic light-sensitive material comprising a support having thereon at least one photographic emulsion layer containing unprefogged internal latent image-type silver halide grains and developing the photographic light-sensitive material after or during fogging to form a direct positive image, wherein the aforesaid development is performed at a pH of from 9 to 12 and in the presence of at least one compound selected from the group consisting of compounds represented by formulae (I), (II), (III), (IV), (V) or (VI), acid salts of the compounds represented by formulae (I) to (IV) provided that the substituents thereof contain an amino group, and acid salts of the compounds represented by formulae (V) or (VI);

##STR9## wherein M represents a hydrogen atom, an alkali metal atom, an ammonium group, or a group cleaving under an alkaline condition;
R represents a group capable of substituting a hydrogen atom;
n represents zero or an integer from 1 to 4;
and R.sub.1, R.sub.2, R.sub.3 , R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, and R.sub.9 each represents a hydrogen atom, --SM' (M' has the same meaning as M), a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted alkylthio group, a substituted or unsubstituted carbonamido group, a substituted or unsubstituted sulfonamido group, a substituted unsubstituted ureido group, a substituted or unsubstituted thioureido group, a substituted or unsubstituted alkyl or aryl oxycarbonylamino group, or a substituted or unsubstituted amino group;
the heterocyclic ring of aforesaid formulae (II), (III) or (IV) may be further condensed with a carbon aromatic ring;
R.sub.11, R.sub.12, R.sub.13, R.sub.14, R.sub.15, R.sub.16, and R.sub.17 each represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group;
and R.sub.11 and R.sub.12, R.sub.12 and R.sub.13, R.sub.14 and R.sub.15, or R.sub.15 and R.sub.16 may combine with each other to form a ring;
R.sub.12 and R.sub.15 may be a hydrogen atom.

5 more elements

A photographic light-sensitive material, which comprises a support having i) at least one photographic emulsion layer containing unprefogged internal latent image-type silver halide grains and ii) as a nucleation accelerator at least one compound selected from the group consisting of compounds represented by formulae (I), (II), (III), (IV), (V), and (VI), acid salts of the compounds represented by formulae (I) to (IV) provided that the substituents thereof contain an amino group, and acid salts of the compounds represented by formula (VI);

##STR11## wherein M represents a hydrogen atom, an alkali metal atom, an ammonium group, or a group cleaving under an alkaline condition;
R represents a group capable of substituting a hydrogen atom;
n represents zero or an integer of from 1 to 4;
and R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, and R.sub.9 each represents a hydrogen atom, --SM' (M' has the same meaning as M), a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted alkylthio group, alkylsulfonyl group, a substituted or unsubstituted carbonamido group, a substituted sulfanamido group, a substituted or unsubstituted ureido group, a substituted or unsubstituted thioureido group, a substituted or unsubstituted alkyl or aryl oxycarbonylamino group, or a substituted or unsubstituted amino group;
the heterocyclic ring of aforesaid formulae (II, (III) or (IV) may be further condensed with a carbon aromatic ring;
R.sub.14, R.sub.15, R.sub.16, and R.sub.17 each represents a substituted or unsubstituted alkenyl group, a substituted or unsubstituted cycloalkyl group, substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group;
and R.sub.14 and R.sub.15, or R.sub.15 and R.sub.16 may combine with each other to form a ring;
R.sub.15 may be a hydrogen atom.

5 more elements

Dependencies are inferred from the claim text.