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

1994-02-14

1995-05-02

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, 430568, G03C 107, G03C 1035

Patent

active

054118514

ABSTRACT:
A grain growth process is disclosed for providing an ultrathin tabular grain emulsion in which the equivalent circular diameter of tabular grains is increased. An aqueous dispersion is provided containing high bromide seed 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 4.6 to 9.0 and a limited stoichiometric excess of bromide ions. An aminopyrimidine grain growth modifier containing mutually independent amino substituents, the 4 and 6 ring position substituents being hydroamino substituents, is introduced into the dispersing medium. The aqueous dispersion containing the aminopyrimidine grain growth modifier is held at room temperature 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 seed grains.

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patent: 5250403 (1993-10-01), Antoniades et al.
patent: 5252452 (1993-10-01), Chang et al.

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