# US 5,707,793 A · Silver halide emulsion and silver halide photographic material using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,707,793 A - Document ID: US5707793A - Status: Granted - Kind: A - Application number: 08/634,791 - Filed: 1996-04-19 - Granted: 1998-01-13 - Earliest claimed: 1995-04-19 - Assignees: Fuji Photo Film Co., Ltd. - Inventors: Takayoshi Oyamada - Web page: https://patentgrep.com/patent/US5707793A ## CPC - G03C 1/0053: {with high content of silver chloride} - G03C 2001/0055: {Aspect ratio of tabular grains in general; High aspect ratio; Intermediate aspect ratio; Low aspect ratio} - G03C 2001/0056: {Disclocations} - Y10S 430/167: X-ray - G03C: PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES (for photomechanical purposes G03F); PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY (photographic processes characterised by the use or manipulation of apparatus classifiable per se in subclass G03B, see G03B; photomechanical production of textured or patterned surfaces G03F; electrophotography, magnetography G03G) - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract A silver halide emulsion is disclosed which comprises at least dispersing medium and silver halide grains, wherein the silver halide grains have an AgCl content of from 30 mol % to 100 mol %; at least 30% of the sum of the projected area of the silver halide grains accounts for tabular grains which satisfy the following conditions (i) to (v): (i) the tabular grains have {100} faces as major faces; (ii) the tabular grains have an aspect ratio (circle-equivalent diameter/thickness) of from 2.0 to 25; (iii) the tabular grains have an average thickness of from 0.02 .mu.m to 0.3 .mu.m; (iv) the tabular grains have an average major face edge length ratio of from 1 to 5; and (v) intermediate grains which have grown to the extent that the average projected area thereof is about 75% of that of the tabular grains have two dislocation lines extending from a nucleus the intermediate grains have, and an angle made by the two dislocation lines is from 5.degree. to 85.degree.. The tabular grains for use in this invention is excellent in the anisotropic growing property, shows a very slow growing speed in the thickness direction and is excellent in the uniformity amount the grains and the silver halide emulsion is excellent in the sensitivity, the graininess, and spectral sensitization characteristics. ## Claims ### Claim 1 A silver halide emulsion comprising at least a dispersing medium and silver halide grains, wherein the silver halide grains have an AgCl content of from 30 mol % to 100 mol %; and at least 30% of the sum of the projected area of the silver halide grains are tabular grains which satisfy the following conditions (i) to (v): (i) the tabular grains have {100} faces as major faces; (ii) the tabular grains have an aspect ratio (circle-equivalent diameter/thickness of from 2.0 to 25; (iii) the tabular grains have an average thickness of from 0.02 .mu.m to 0.3 .mu.m; (iv) the tabular grains have an average major face edge length ratio of from 1 to 5; and (v) the tabular grains have been grown from intermediate grains which have two dislocation lines extending from about the nucleus until the intermediate grains have a projected area of about 75% or more of the projected area of the finished tabular grains, wherein the angle made by the two dislocation lines is from 5.degree. to 85.degree. when viewed in a direction perpendicular to the major face of the tabular grain. ### Claim 2 (depends on 1) The silver halide emulsion of claim 1, wherein the tabular grains have been grown from intermediate grains which have two dislocation lines extending from about the nucleus until the intermediate grains have a projected area of about 85% or more of the projected area of the finished tabular grains. ### Claim 3 (depends on 2) The silver halide emulsion of claim 2, wherein the tabular grains have been grown from intermediate grains which have two dislocation lines extending from about the nucleus until the intermediate grains have a projected area of about 99% or more of the projected area of the finished tabular grains. ### Claim 4 (depends on 1) The silver halide emulsion of claim 1, wherein the two dislocation lines exist in the tabular grains coated in a silver halide photographic material. ### Claim 5 (depends on 1) The silver halide emulsion of claim 1, wherein the angle made by the two dislocation lines is from 30.degree. to 75.degree.. ### Claim 6 (depends on 5) The silver halide emulsion of claim 5, wherein the angle made by the two dislocation lines is from 45.degree. to 75.degree.. ### Claim 7 (depends on 1) The silver halide emulsion of claim 1, wherein at least 45% of the sum of the projected area of the silver halide grains are tabular grains. ### Claim 8 (depends on 7) The silver halide emulsion of claim 7, wherein at least 60% of the sum of the projected area of the silver halide grains are tabular grains. ### Claim 9 (depends on 1) The silver halide emulsion of claim 1, wherein the silver halide grains have an AgCl content of from 50 mol % to 100 mol %. ### Claim 10 (depends on 9) The silver halide emulsion of claim 9, wherein the silver halide grains have an AgCl content of from 80 mol % to 100 mol %. ### Claim 11 (depends on 1) The silver halide emulsion of claim 1, wherein the nucleus at the nucleation exists in a regular square of from 0.001% to 10% of the projected area of each of the tabular grains, the regular square including one corner of each of the tabular grains. ### Claim 12 (depends on 1) The silver halide emulsion of claim 1, which is subjected to a gold sensitization and at least a calcogen sensitization. ### Claim 13 A silver halide photographic material comprising a support and at least one silver halide emulsion is coated on at least one side of the support, wherein the silver halide emulsion comprises at least a dispersing medium and silver halide grains, wherein the silver halide grains have an AgCl content of from 30 mol % to 100 mol %; at least 30% of the sum of the projected area of the silver halide grains are tabular grains which satisfy the following conditions (i) to (v): (i) the tabular grains have {100} faces as major faces; (ii) the tabular grains have an aspect ratio (circle-equivalent diameter/thickness) of from 2.0 to 2.5; (iii) the tabular grains have an average thickness of from 0.02 .mu.m to 0.3 .mu.m; (iv) the tabular gains have an average major face edge length ratio of from 1 to 5; and (v) the tabular grains have been grown from intermediate grains which have two dislocation lines extending from about the nucleus until the intermediate grains have a projected area of about 75% or more of the projected area of the finished tabular grains, wherein the angle made by the two dislocation lines is from 5.degree. to 85.degree. when viewed in a direction perpendicular to the major face of the tabular grain. ### Claim 14 (depends on 13) The silver halide photographic material of claim 13, wherein the silver halide emulsion is located on both sides of the support. ### Claim 15 (depends on 14) The silver halide photographic material of claim 14, which is used with a fluorescent intensifying screen, wherein the fluorescent intensifying screen emits light by an X-ray exposure having a peak at a wavelength of from 200 nm to 400 nm. ### Claim 16 A method for producing a silver halide emulsion comprising at least a dispersing medium and silver halide grains having an AgCl content of from 30 mol % to 100 mol %, said method comprising the step of reacting a silver compound and halide compound, wherein at least 30% of the sum of the projected area of the silver halide grains are tabular grains which satisfy the following conditions (i) to (v): (i) the tabular grains have {100} faces as major faces; (ii) the tabular grains have an aspect ratio (circle-equivalent diameter/thickness) of from 2.0 to 2.5; (iii) the tabular grains have an average thickness of from 0.02 .mu.m to 0.03 .mu.m; (iv) the tabular grains have an average major face edge length ratio of from 1 to 5; and (v) the tabular grains have been grown from intermediate grains which have two dislocation lines extending from about the nucleus until the intermediate grains have a projected area of about 75% or more of the projected area of the finished tabular grains, wherein the angle made by the two dislocation lines is from 5.degree. to 85.degree. when viewed in a direction perpendicular to the major face of the tabular grain. ### Claim 17 (depends on 16) The method of claim 16, wherein the two dislocation lines are maintained without vanishing until the intermediate grains have grown to have a projected area of about 85% or more of the projected area of the finished tabular grains. ### Claim 18 (depends on 17) The method of claim 17 wherein the two dislocation lines are maintained without vanishing until the intermediate grains have grown to have a projected area of about 99% or more of the projected area of the finished tabular grains. ### Claim 19 (depends on 16) The method of claim 16, wherein at least 45% of the sum of the projected area of the silver halide grains are tabular grains. ### Claim 20 (depends on 19) The method of claim 19, wherein at least 60% of the sum of the projected area of the silver halide grains are tabular grains.