High speed emulsions exhibiting superior contrast and speed-gran

Details High speed emulsions exhibiting superior contrast and speed-gran High speed emulsions exhibiting superior contrast and speed-gran

1996-01-26

1997-03-25

Huff, Mark F.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430570, 430581, G03C 1035

Patent

active

056143591

ABSTRACT:
Spectrally sensitized tabular grain emulsions are disclosed exhibiting (1) increased speeds and (2) contrasts and speed-granularity relationships superior to those of conventional emulsions of the same average grain sizes. The tabular grains have {111} major faces, contain greater than 80 mole percent bromide, based on silver, and are substantially free of iodide, exhibit an average aspect ratio of greater than 50 and an average equivalent circular diameter of >10 micrometers, account for greater than 90 percent of total grain projected area, and have latent image forming chemical sensitization sites on their surfaces including epitaxially deposited silver halide protrusions of a face centered cubic rock salt crystal lattice structure forming epitaxial junctions with the tabular grains. The protrusions are restricted to those portions of the tabular grains (a) located nearest peripheral edges of and (b) accounting for less than 50 percent of the {111} major faces of the tabular grains. The protrusions contain silver iodide and a silver chloride concentration at least 10 mole percent higher than that of the tabular grains.

REFERENCES:
patent: 4435501 (1984-03-01), Maskasky
patent: 4439520 (1984-03-01), Kofron et al.
patent: 4775617 (1988-10-01), Goda
patent: 4806461 (1989-02-01), Ikeda et al.
patent: 4839268 (1989-06-01), Bando
patent: 4914010 (1990-04-01), Momoki
patent: 4977074 (1990-12-01), Saitou et al.
patent: 5132203 (1992-07-01), Bell et al.
patent: 5210013 (1993-05-01), Tsaur et al.
patent: 5250403 (1993-10-01), Antoniades et al.
patent: 5272048 (1993-12-01), Kim et al.
patent: 5334469 (1994-08-01), Sutton et al.
patent: 5334495 (1994-08-01), Black et al.
patent: 5411851 (1995-05-01), Maskasky
patent: 5418125 (1995-05-01), Maskasky
patent: 5460934 (1995-10-01), Delton
patent: 5470698 (1995-11-01), Wen
patent: 5494789 (1996-02-01), Daubendiek et al.
Farnell, "The Relationship Between Speed and Grain Size", The Journmal of Photographic Science, vol. 17, 1969, pp. 116-125.
Tani, "Factors Influencing Photographic Sensitivity", Journal of Photographic Science and Technology, Japan, vol. 43, No. 6, 1980, pp. 335-346.

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