Radiation imagery chemistry: process – composition – or product th – Post imaging processing – Developing
Patent
1982-09-30
1983-08-23
Downey, Mary F.
Radiation imagery chemistry: process, composition, or product th
Post imaging processing
Developing
430495, 430496, 430564, 430567, 430569, 430615, 430629, G03C 526, G03C 176, G03C 102
Patent
active
044004630
ABSTRACT:
Radiation-sensitive photographic emulsions are disclosed comprised of a dispersing medium and silver halide grains the halide content of which is at least 50 mole percent chloride, based on silver. The silver halide grains include tabular grains having a thickness of less than 0.5 micron, a diameter of at least 0.6 micron, and an average aspect ratio greater than 8:1 which account for at least 50 percent of the total projected area of the silver halide grains. The tabular grains have two opposed substantially parallel major crystal faces lying in {111} crystal planes and exhibiting at least one of the following features: (1) at least one peripheral edge lying parallel to a <211> crystallographic vector lying in the plane of one of the major faces and (2) bromide and/or iodide incorporated in a central grain region. The tabular grains are formed in the presence of an aminoazaindene and a peptizer having a thioether linkage.
REFERENCES:
patent: 3519426 (1970-07-01), Halwig
Chem. Absts. vol. 68, 1968, 64577e.
Duffin, Photographic Emulsion Chemistry, 1966, pp. 66-72.
Trivelli and Smith, "The Effect of Silver Iodide Upon the Structure of Bromo-Iodide Precipitation Series," The Photo. Journal vol. LXXX, 1940, pp. 285-288.
Gutoff, "Nucleation and Growth Rates During the Precipitation of Silver Halide Photographic Emulsions", Photo Sci. & Eng., vol. 14, No. 4, pp. 248-257.
Downey Mary F.
Eastman Kodak Company
Thomas Carl O.
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