Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Patent
1987-08-28
1989-01-31
Shah, Mukund J.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
430480, 430486, 430613, 430614, 430966, C03C 102
Patent
active
048015237
ABSTRACT:
Process for preparing photographic emulsion comprising bringing aqueous silver and chloride-containing halide salt solutions into contact in the presence of a dispersing medium to form octahedral silver halide grains having a halide content of at least 50 mole percent chloride, based on total moles of silver present, the improvement forming the grains in the presence of a crystal modifying amount of an aminoazapyridine as described in pH range of 2.5 to 9, pCl range of 0 to 3, the aminoazapyridine compound being added after at least about 6% to about 45% of the silver salt solution has been added.
The photographic emulsion is useful in x-ray, laser scanner films, as color separation elements and inverse transfer systems, etc.
REFERENCES:
patent: 4292391 (1981-09-01), Overman
patent: 4469784 (1984-09-01), Heki et al.
patent: 4610958 (1986-09-01), Matsuzaka et al.
patent: 4636457 (1987-01-01), Valbusa et al.
patent: 4695534 (1987-09-01), Bryan et al.
Claes, et al., "Crystal Habit Modification of AgCl by Impurities Determining the Solvation," The Journal of Photographic Science, vol. 21, pp. 122-124, Jun. 1973.
D. Wyrsch, "Sulfur Sensitization of Monosized Silver Chloride Emulsions with <111>, <110> and <100> Crystal Habit (FC-4)", paper III-13, International Congress of Photographic Science, pp. 122-124, 1978.
E. I. Du Pont de Nemours and Company
Shah Mukund J.
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