Abstract A direct positive silver halide photosensitive material containing in its silver halide emulsion layer and/or the adjacent layer(s) thereof (1) at least one sensitizing dye represented by the following general formula I: wherein R and R'' are each an alkyl or a substituted alkyl group, L is a methine chain, Z represents the group of atoms necessary to form a five or six membered nitrogen-containing heterocyclic nucleus, X is an anion and n is 0 or 1, and (2) at least one water-soluble (high) polymer having repeating units represented by the following general formula II: wherein R1 is H or CH3, R2 is -OH, -OCOR3, -COOR3, -CN, -CONH2, -CONHR3, in which R3 and R4 each represents an alkyl group of from one to four carbon atoms and R5 represents H, CH3 or C2H5, and x is a positive number of from 50 to 100 representing the percentage ratio, is disclosed.
The silver halide photosensitive emulsion of claim 1, wherein said dye is selected from the group consisting of
Claim 2
Dependent Claim
18 words
at least one water soluble high polymer having the repeating unit represented by the following general formula II;
Claim 3
Dependent Claim
19 words
The silver halide photosensitive emulsion of claim 2, wherein said high polymer is selected from the group consisting of:
Claim 4
Dependent Claim
61 words
The silver halide photosensitive emulsion of claim 1, wherein said sensitizing dye is present at a level of from 1 mg to 200 mg per mole of silver halide and wherein said high polymer has a molecular weight ranging from 5,000 to 500,000, and is present at a level of from 0.5 g to 50 g per mole of silver halide.
Claim 5
Dependent Claim
51 words
The silver halide photosensitive emulsion of claim 1, wherein R and R'' are selected from the group consisting of a methyl group, an ethyl group, an n-propyl group, an isobutyl group, a Beta -sulfoethyl group, a gamma -sulfopropyl group, a Beta -methoxy-ethyl group, a Beta -hydroxyethyl group, and a carboxymethyl group.