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Silver halides photographic emulsion and silver halides photographic sensitive materials

A photographic emulsion and silver halide technology, applied in photosensitive materials, optics, instruments, etc., can solve the problems that the color tone is not easy to harden, hinder the multi-purpose use of epitaxial sensitization methods, etc.

Inactive Publication Date: 2006-07-26
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the epitaxial sensitization method using silver chloride as the main component, although high sensitivity can be obtained, there is a problem that the color tone is not easy to harden.
This hinders the multipurpose use of epitaxial sensitization methods and epitaxial particles or prior art in general photographic photosensitive materials

Method used

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  • Silver halides photographic emulsion and silver halides photographic sensitive materials
  • Silver halides photographic emulsion and silver halides photographic sensitive materials
  • Silver halides photographic emulsion and silver halides photographic sensitive materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] The advantages of the silver chloride content distribution in the epitaxial convex portion and the silver iodide content distribution in the epitaxial convex portion will be described in detail below.

[0111] (Preparation of emulsion a)

[0112] 1600 mL of an aqueous solution containing 1.2 g of KBr and 1.9 g of oxidized gelatin with an average molecular weight of 15000 was stirred at 30°C. A double injection method was used to add silver nitrate (2.7g) aqueous solution and halogen aqueous solution (containing 1.9g KBr and 3.0g above gelatin) within 12 seconds. After the KBr aqueous solution (KBr is 3.22 g) was added, the temperature was increased to 49°C. After adding an aqueous solution containing 22 g of oxidized gelatin with an average molecular weight of 100,000, an aqueous solution of silver nitrate (175.3 g) and an aqueous KBr solution were added within 29 minutes to perform the first growth. During the addition, the silver potential was maintained at -20 mv relativ...

Embodiment -2

[0153] The following further describes in detail the addition of the silver iodide ultrafine grain emulsion prepared just before the addition of the silver iodide content in the epitaxial part to obtain the advantages of the present invention.

[0154] (Preparation of emulsion d)

[0155] In the emulsion c of Example 1, the part of the silver iodide fine particle emulsion prepared in advance and having an equivalent circle diameter of 0.03 μm remained insoluble, so its photographic performance could not be evaluated. Therefore, the preparation of emulsion c was modified as follows to prepare emulsion d.

[0156]In the second growth of emulsion c, a three-injection method was used to add silver nitrate (25.8 g) aqueous solution, KI aqueous solution (6 mol% relative to Ag), and KBr aqueous solution within 17 minutes. During the addition, the addition of the KBr aqueous solution was adjusted to maintain the silver potential of the mixture at -20 mV relative to the saturated calomel e...

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Abstract

A silver halide photographic emulsion, wherein at least 70% of the total projected area of silver halide grains contained therein is occupied by silver bromochloroiodide hexagonal epitaxial tabular grains each having (111) faces as main planes and an epitaxial protrusion portion, wherein the epitaxial protrusion portion exists on at least one apex portion of the hexagon, and, when an average silver chloride content of the epitaxial protrusion portions of all the grains having the epitaxial protrusion portion is expressed as CL mol%, a silver chloride content of each epitaxial protrusion portion of each grain falls within the range of 0.7 CL to 1.3 CL.

Description

Technical field [0001] The invention relates to a silver halide photographic emulsion and a silver halide photographic photosensitive material using the emulsion. More specifically, the present invention relates to a silver halide photographic emulsion with high sensitivity and hard tone, and a silver halide photographic photosensitive material using the emulsion. Background technique [0002] The use of flaky silver halide grains (hereinafter referred to as "flaky grains") to obtain high-sensitivity silver halide photographic photosensitive materials is known to those skilled in the art. In Japanese Patent Application KOKAI Publication (hereinafter referred to as JP-A) 58-108526 and JP-A 59-133540, methods for sensitizing these flaky particles using epitaxial growth knots are disclosed. In JP-A's-8-69069, 8-101472, 8-101474, 8-101475, 8-171162, 8-171163, 8-101473, 8-101476, 9-211762 and 9-211763 and US5612176, 5614359, 5629144 , 5631126, 5691127 and 5726007 disclose the use of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03C1/035
Inventor 井浜三树男古泽元一
Owner FUJIFILM CORP