Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Patent
1992-11-04
1993-10-12
Baxter, Janet C.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
430567, 430637, G03C 1015
Patent
active
052524531
ABSTRACT:
A process is disclosed of accelerating the preparation of a photographic emulsion containing tabular silver halide grains exhibiting a reduced degree of total grain dispersity. A dispersing medium is provided containing bromide ions, and a population of silver halide grain nuclei containing parallel twin planes is formed in the dispersing medium. A portion of the grain nuclei are ripened out, and then the silver halide grain nuclei containing parallel twin planes remaining are grown to form tabular silver halide grains. A polyalkylene oxide containing both hydrophilic and lipophilic block units is selected from among those known to be capable of reducing total grain dispersity when present during nucleation. However, in this process precipitation is accelerated while maintaining low dispersity of the total grain population by forming twin planes in the grain nuclei within the pAg and temperature boundaries of Curve A in FIG. 1 and by delaying introduction of the polyalkylene oxide block copolymer surfactant until after the silver halide nuclei containing twin planes have been formed.
REFERENCES:
patent: 5147771 (1992-09-01), Tsaur et al.
patent: 5147772 (1992-09-01), Tsaur et al.
patent: 5147773 (1992-09-01), Tsaur et al.
patent: 5171659 (1992-12-01), Tsaur et al.
Kam-Ng Mamie
Kim Sang H.
Tsaur Allen K.
Baxter Janet C.
Eastman Kodak Company
Thomas Carl O.
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