Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Patent
1991-09-17
1994-05-10
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
430569, G03C 1005
Patent
active
053106440
ABSTRACT:
A process for preparing a photographic emulsion involves an initial nucleation step of reacting a first silver salt with a bromide in the presence of a first excess halide under conditions effective to nucleate AgBr crystals. The nuclei are then grown to form photosensitive grains by addition of a second silver salt and a second halide as growth salts. If excess chloride is used during nucleation, even without excess bromide and/or a growth modifier, the nuclei formed have twin planes, and the pAg level can be used to control the aspect ratio of the tabular grains obtained. If a relatively high silver concentration in the growth solution is maintained throughout the growth step, the resulting grains have a unique, twinned cubooctahedral or cubooctahedral-tabular shape. Unique tabular grains having alternating 1.1.1 and 1.0.0 edge faces can be formed by this process.
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Bowers Jr. Charles L.
Eastman Kodak Company
Leipold Paul A.
McPherson John A.
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