Silver halide color photosensitive material

A technology for photosensitive materials and color photography, which is applied in the fields of photosensitive materials, optics, and color reduction processing technology, and can solve the problems of insufficient fog stability, sensitivity stability, etc.

Inactive Publication Date: 2005-11-09
KONICA MINOLTA OPTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the tabular silver halide grains prepared by this method are effective for granular properties, radiation fog resistance, etc., the

Method used

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  • Silver halide color photosensitive material
  • Silver halide color photosensitive material
  • Silver halide color photosensitive material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0221]

[0222] [Preparation of Tabular Silver Halide Emulsion Em-1]

[0223] Tabular silver halide emulsion Em-1 was prepared by the following procedure using the silver halide emulsion production facility shown in FIG. 1 described in JP-A-2001-201811.

[0224] [nucleation process]

[0225] In the reaction vessel, the following reaction mother liquid (Gr-1) was kept at 30°C, using a mixing and stirring device described in JP-A No. 62-160128, stirring at a stirring speed of 400 rpm, using 1 mol / L of sulfuric acid, adjust the pH to 1.96. Next, the following (S-1) solution and the following (H-1) solution were added at a constant flow rate for 1 minute by the controllable double-nozzle method to form nuclei.

[0226] (Gr-1)

[0227] Oxidized low molecular weight gelatin (average molecular weight 20,000) 40.5g

[0228] Potassium bromide 12.4g

[0229] Fill up to 16.2L with distilled water

[0230] (S-1)

[0231] Silver nitrate 862.5g

[0232] Add to 4.06L with distille...

Embodiment 2

[0540] According to the method implemented in Example 1, except that tabular silver halide emulsions Em-1 to Em-7 were used as silver halide emulsions for the high-sensitivity red color-sensitive layer of the fifth layer, the rest was carried out in the same manner as in Example 1. Each silver halide color photographic photosensitive material was prepared by the method, and the relative sensitivity of the cyan image, graininess performance, radiation fog resistance and humidity dependence during exposure were evaluated. The characteristics of any of the samples of the present invention were excellent.

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Abstract

A silver halide color photosensitive material exhibiting a high photosensitivity, an excellent granularity, a low humidity-dependence in photographing, and a favorable radiation fog resistance. The material is characterized in that at least one of the photosensitive layers of the material contains a silver halide emulsion made of silver halide particles, at least 50% of the total projection area of the silver halide particles contained in the silver halide emulsion includes two twin planes parallel to a major surface, the silver halide flat particles satisfies expression shown below and has an aspect ratio of 8 or more, and the content of fog particles in the unsensitized silver halide emulsion is 1/20 or less. Expression 1.0 <=b/a <= 1.3 [In the expression, a is the shorter one of the distance from one of the opposed major surfaces to the nearest twin plane and the distance from the other to the nearest twin plane when a line passing the center of the particle diameter is drawn vertically to the opposed major surfaces, and b is the longer one.]

Description

technical field [0001] The present invention relates to a silver halide color photographic photosensitive material, and more specifically, to a silver halide color photographic photosensitive material with high sensitivity, excellent granularity, low humidity dependence during photography, and good resistance to radiation fog. Background technique [0002] In recent years, with the popularization of compact cameras, auto-focus SLR cameras, and film with lenses, etc., the development of high-sensitivity and high-quality silver halide color photographic photosensitive materials is strongly desired. Therefore, the requirements for improving the performance of silver halide emulsions for photography are becoming more and more stringent, and there are requirements for higher levels of photographic performance such as high sensitivity, excellent graininess, and excellent sharpness. [0003] Regarding the above-mentioned problems, in, for example, U.S. Patent Nos. 4,434,226, 4,439,...

Claims

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Application Information

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IPC IPC(8): G03C1/035G03C7/30
CPCG03C7/3022G03C2001/0055G03C2001/0058
Inventor 高田宏
Owner KONICA MINOLTA OPTO
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