Silver halide photographic photosensitive material
AssigneeMitsubishi Paper Mills Limited
InventorsSatoshi Kaneko, Akira Tanaka
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Abstract
The present invention provides a silver halide photographic photosensitive material which comprises a support and at least one silver halide photographic emulsion layer, a hydrazine compound being contained in at least one of the emulsion layer and other hydrophilic colloid layer, characterized in that at least one of the emulsion layer and other hydrophilic colloid layer contains a water-soluble polymer having an amino group exclusive of a primary amino group as a promoter for enhancement of contrast. By using the said silver halide photographic photosensitive material, images of high contrast can be formed using a developer of low pH value without causing change in photographic performances even when the pH value changes.
Claims7
A silver halide photographic photosensitive material which comprises;
- a support,
- at least one hydrophilic colloid layer which is a silver halide emulsion layer, and
- at least one additional hydrophilic colloid layer, which is not a silver halide emulsion layer,
- a hydrazine compound being contained in said at least one silver halide layer or said at least one additional hydrophilic colloid layer,
- wherein the same or different at least one silver halide layer or at least one additional hydrophilic colloid layer contains a water-soluble vinyl polymer having an amino group exclusive of a primary amino group as a promoter for contrast enhancement by the hydrazine compound represented by the following formula (1):
- ##STR12## wherein R.sub.11, R.sub.12, R.sub.13, R.sub.21, R.sub.22 and R.sub.23 each represents an hydrogen atom or an alkyl group, R.sub.12 and R.sub.13 may be the same or different and may form a ring together, R.sub.22 and R.sub.23 may be the same or different and may form a ring together, R.sub.22 and R.sub.23 cannot be simultaneously hydrogen atom, X represents an alkylene group, 1 and m each represent 0 or 1, n represents an integer of 2-30, Z represents a residue of an ethylenically unsaturated monomer, and p, q and r each represent wt %, and p is 0-95 wt %, q is 5-100 wt % and r is 0-50 wt %, L.sub.1 and L.sub.2 each represent a linkage group selected from the group consisting of the following, ##STR13## wherein R.sub.31 and R.sub.41 each represent a lower alkyl group or an alkoxy group and x and y each represent an integer of 0-4.
A silver halide photographic photosensitive material which comprises a support, at least one hydrophilic colloid layer which is a silver halide emulsion layer, and at least one additional hydrophilic colloid layer which is not a silver halide emulsion layer, a hydrazine compound being contained in said at least one silver halide layer or said at least one additional hydrophilic colloid layer, wherein the same or different at least one silver halide layer or at least one additional hydrophilic colloid layer contains a water-soluble polymer according to, wherein the water-soluble polymer is represented by the following formula:
- ##STR14## wherein R.sub.11, R.sub.12, R.sub.13, R.sub.21, R.sub.22, R.sub.23, R.sub.24, R.sub.31 and R.sub.32 each represent a hydrogen atom or an alkyl group, and R.sub.12 and R.sub.13 may be the same or different and may link to each other to form a ring and R.sub.23 and R.sub.24 may be the same or different and may link to each other to form a ring with a proviso that R.sub.23 and R.sub.24 cannot be simultaneously hydrogen atom, L represents a divalent linkage group, x, y and z shows mol % add x is 20-99 mol %, y is 1-50 mol %, and z is 0-50 mol %, and n is 3-50.
Dependencies are inferred from the claim text.