G - Physics – 03 – C
Patent
G - Physics
03
C
G03C 1/035 (2006.01) G03C 1/005 (2006.01) G03C 1/025 (2006.01) G03C 1/46 (2006.01) G03C 7/30 (2006.01)
Patent
CA 2063843
HIGHLY UNIFORM SILVER BROMOIODIDE TABULAR GRAIN EMULSIONS AND PROCESSES FOR THEIR PREPARATION Abstract of the Disclosure Novel tabular grain emulsions and a process for their preparation are disclosed in which silver bromoiodide tabular grains account for greater than 97 percent of total grain projected area and the coefficient of variation of the total grain population is less than 25 percent. This is achieved by forming in a first reaction vessel and transporting to a second reaction vessel a population of silver bromide grain nuclei in the form of regular octahedra having an equivalent circular diameter of less than 40 nanometers and a coefficient of variation of less than 50 percent and in the second reaction vessel converting the grain nuclei into a grain population containing parallel twin planes in more than 90 percent of the grains, so that upon further growth silver bromoiodide tabular grains of desired properties can be realized.
Antoniades Michael G.
Daubendiek Richard L.
Fenton David E.
Hall Jeffrey L.
Jagannathan Ramesh
Antoniades Michael G.
Daubendiek Richard L.
Eastman Kodak Company
Fenton David E.
Gowling Lafleur Henderson Llp
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