P
USH1609HExpiredUtilityPatentIndex 51

Silver halide photographic emulsion

Priority: Dec 3, 1992Filed: Jan 12, 1995Granted: Nov 5, 1996
Est. expiryDec 3, 2012(expired)· nominal 20-yr term from priority
Inventors:KONDO TOSHIYA
G03C 2001/0058G03C 1/0051G03C 2001/03535G03C 2001/0357G03C 2001/0055
51
PatentIndex Score
1
Cited by
8
References
20
Claims

Abstract

Disclosed is a silver halide photographic light-sensitive emulsion comprising silver halide grains and a dispersant, wherein at least 50% of the total projected areas of the silver halide grains are occupied by tabular silver halide grains wherein the tabular silver halide grains each have two or more twin plane parallel to major plane of the tabular silver halide grains and an average distance between the two or more twin planes is not less than 130 Å and not more than 500 Å and a grain size distribution of the tabular silver halide grains is less than 20%.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. A silver halide photographic light-sensitive emulsion comprising silver halide grains in a dispersion medium, at least 50% of the total projected area of said silver halide grains being occupied by tabular silver halide grains having an aspect ratio of at least 1.3, an average silver iodide content in the range of 4 mol % to a solid solution limit, said silver halide grains each having at least one pair of twin planes parallel to a major plane of said tabular silver halide grains, an average distance between adjacent twin planes being 130 Å to 500 Å, a grain size distribution of said tabular silver halide grains being less than 20%. 
     
     
       2. The emulsion of claim 1 wherein said tabular silver halide grains each has one pair of twin planes parallel to a major plane of said tabular silver halide grains. 
     
     
       3. The silver halide photographic light-sensitive emulsion of claim 1, wherein said tabular silver halide grains have inside a silver iodobromide phase containing silver iodide at not less than 10 mol % and not more than a solid solution limit of said tabular silver halide grain. 
     
     
       4. The silver halide photographic light-sensitive emulsion of claim 1, wherein said average distance between the two or more twin planes is not less than 150 Å and not more than 400 Å. 
     
     
       5. The silver halide photographic light-sensitive emulsion of claim 1, wherein said average distance between the two or more twin planes is not less than 170 Å and not more than 300 Å. 
     
     
       6. The silver halide photographic light-sensitive emulsion of claim 1, wherein at least 60% of the total projected areas of the silver halide grains are occupied by said tabular silver halide grains. 
     
     
       7. The silver halide photographic light-sensitive emulsion of claim 1, wherein at least 70% of the total projected areas of the silver halide grains are occupied by said tabular silver halide grains. 
     
     
       8. The silver halide photographic light-sensitive emulsion of claim 1, wherein at least 80% of the total projected areas of the silver halide grains are occupied by said tabular silver halide grains. 
     
     
       9. The silver halide photographic light-sensitive emulsion of claim 1, wherein an average aspect ratio of said tabular silver halide grains is not less than 1.5 and less than 5. 
     
     
       10. The silver halide photographic light-sensitive emulsion of claim 1, wherein an average aspect ratio of said tabular silver halide grains is not less than 1.7 and less than 5. 
     
     
       11. The silver halide photographic light-sensitive emulsion of claim 1, wherein an average aspect ratio of said tabular silver halide grains is not less than 2.0 and less than 4.5. 
     
     
       12. The silver halide photographic light-sensitive emulsion of claim 1, wherein a diameter of said silver halide grain is within the range of 0.1μm to 5.0 μm. 
     
     
       13. The silver halide photographic light-sensitive emulsion of claim 1, wherein a diameter of said silver halide grain is within the range of 0.2 μm to 4.0 μm. 
     
     
       14. The silver halide photographic light-sensitive emulsion of claim 1, wherein a diameter of said silver halide grain is within the range of 0.3 μm to 3.0 μm. 
     
     
       15. The silver halide photographic light-sensitive emulsion of claim 1, wherein said tabular silver halide grains have inside a silver iodobromide phase containing silver iodide at not less than 15 mol % and not more than a solid solution limit of said tabular silver halide grain. 
     
     
       16. The silver halide photographic light-sensitive emulsion of claim 1, wherein said silver halide emulsion is produced by an acidic method or a neutral method. 
     
     
       17. A silver halide multilayer photographic material comprising the silver halide photosensitive light-emulsion of claim 1. 
     
     
       18. The silver halide photographic light-sensitive emulsion of claim 1 containing a silver halide emulsion selected from silver bromide, silver iodobromide, or silver chloroiodobromide. 
     
     
       19. A silver halide photographic light-sensitive emulsion comprising silver halide grains in a dispersion medium, wherein at least 60% of a total projected area of said silver halide grains is occupied by tabular silver halide grains having an aspect ratio of at least 1.3, an average silver iodide content in the range of 4 mol % to a solid solution limit, said tabular silver halide grains each having at least one pair of twin planes parallel to a major plane of said tabular silver halide grains, an average distance between adjacent twin planes being 150 Å to 400 Å, a grain size distribution of said tabular silver halide grains being less than 20%. 
     
     
       20. A silver halide multilayer photographic material comprising the silver halide photosensitive light-sensitive emulsion of claim 19.

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