High bromide tabular grain emulsions with dislocations in periph

Details High bromide tabular grain emulsions with dislocations in periph High bromide tabular grain emulsions with dislocations in periph

1996-11-21

1997-11-25

Chea, Thorl

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, 430569, G03C 1005, G03C 1047

Patent

active

056911319

ABSTRACT:
A photographic emulsion is disclosed comprised of a radiation-sensitive high bromide tabular grain emulsion. At least 50 percent of total grain projected area is accounted for by tabular grains each comprised of (a) less than 12 mole percent iodide and greater than 50 mole percent bromide, based on silver, (b) a central region accounting for at least 50 percent of grain projected area, and (c) a peripheral region containing crystal lattice dislocations and a higher iodide concentration than the overall average iodide concentration of the tabular grains. The emulsion contains a hydrophilic colloid peptizer derived from a water dispersible cationic starch.
The iodide and dislocations in the peripheral regions contribute to increased photographic speeds. The water dispersing cationic starch facilitates emulsion precipitation and chemical sensitization.

REFERENCES:
patent: 4433048 (1984-02-01), Solberg et al.
patent: 4439520 (1984-03-01), Kofron et al.
patent: 4806461 (1989-02-01), Ikeda et al.
patent: 5096806 (1992-03-01), Nakamura et al.
patent: 5476760 (1995-12-01), Fenton et al.
patent: 5604085 (1997-02-01), Maskasky
James, "The Theory of the Photographic Process" 4th Ed., Macmillan, 1977, p.51.
Mees, "The Theory of the Photographic Process", Rev. Ed., Macmillan, 1951, pp. 48-49.
"Research Disclosure", vol. 389, Sep. 1996, Item 38957, II. A.

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