Grain growth process for the preparation of high bromide ultrath

Details Grain growth process for the preparation of high bromide ultrath Grain growth process for the preparation of high bromide ultrath

1994-09-08

1995-05-23

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, 430600, 430613, G03C 1015, G03C 1035, G03C 107

Patent

active

054181259

ABSTRACT:
A grain growth process is disclosed for providing an ultrathin tabular grain emulsion in which the average equivalent circular diameter of tabular grains is increased. An aqueous dispersion is provided containing high bromide grains having an average thickness of less or equal to that of the ultrathin tabular grains to be produced, the dispersion having a pH in the range of from 2 to 8 and a limited stoichiometric excess of bromide ions. An 8-hydroxyquinoline that contains at least one iodo substituent is introduced into the dispersing medium as a grain growth modifier. The aqueous dispersion containing the iodo-8-hydroxyquinoline grain growth modifier is held at 40.degree. C. or a convenient higher temperature until greater than 50 percent of total grain projected area is accounted for by ultrathin tabular grains having {111} major faces of a higher average equivalent circular diameter than the starting grains and an average aspect ratio of at least 5.

REFERENCES:
patent: 4399215 (1983-08-01), Wey
patent: 4400463 (1983-08-01), Maskasky
patent: 4520099 (1985-05-01), Akimura et al.
patent: 4713323 (1987-12-01), Maskasky
patent: 4914014 (1990-04-01), Daubendiek et al.
patent: 5217858 (1993-06-01), Maskasky
patent: 5250403 (1993-10-01), Antoniades et al.
patent: 5340695 (1994-08-01), Yamaguchi

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