(111) tabular grain emulsions exhibiting increased speed

Details (111) tabular grain emulsions exhibiting increased speed (111) tabular grain emulsions exhibiting increased speed

1996-01-26

1997-03-18

Huff, Mark F.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430570, 430581, G03C 1035

Patent

active

056121776

ABSTRACT:
A radiation-sensitive high bromide {111} tabular grain emulsion is disclosed in which at least 90 percent of silver halide epitaxy of an isomorphic face centered cubic crystal lattice structure containing at least 1 mole percent iodide is deposited on the {111} major faces in the form of monocrystalline terraces. Each epitaxial terrace is grown from a nucleation site along an edge of a {111} major face inwardly, with terraces overlying less than 25 percent of the {111} major faces. Surprisingly, these emulsions exhibit higher photographic speeds than those produced by growing silver halide epitaxy outwardly as protrusions from the corners or edges of the tabular grains.

REFERENCES:
patent: 4435501 (1984-03-01), Maskasky
patent: 4471050 (1984-09-01), Maskasky
patent: 5250403 (1993-10-01), Antoniades et al.
patent: 5494789 (1996-02-01), Daubendiek et al.

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