Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Patent
1987-02-17
1987-12-15
Kittle, John E.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
430434, 430495, 430496, 430564, 430567, G03C 102, G03C 176, G03C 526
Patent
active
047133236
ABSTRACT:
The present invention is directed to a process of precipitating for use in photography a high aspect ratio tabular grain emulsion employing a dispersing medium containing a gelatino-peptizer comprised of less than 30 micromoles of methionine per gram and at least a 0.5 molar concentration of chloride ion. A wide range of chloride ion concentrations in the tabular grains can be achieved while avoiding the use of tabular grain thickening ripening agents and synthetic peptizers.
REFERENCES:
patent: 2890215 (1959-06-01), Corben
patent: 4399215 (1983-08-01), Wey
patent: 4400463 (1983-08-01), Maskasky
Research Disclosure, vol. 176, Dec., 1978, Item 17643, Section IX, Vehicles & Vehicle Extenders.
Moll, "Investigations of Oxidized Gelatins", 2nd Photographic Gelatin Symposium, sponsored by the Royal Photographic Society, Oxford, United Kingdom, Sep. 6, 1985.
Research Disclosure, vol. 225, Jan. 1983, Item 22534.
J. Pouradier & A. Rondeau, "On the Methionine Sulphoxide of Gelatin", The Journal of Photographic Science, vol. 16, 1968, pp. 68 & 69.
Y. Matsuo, "Degradation of Methionine by Hydrogen Peroxide", Nature, vol. 171, p. 1021, 1953.
J. Beersman, "Proceedings of the International Colloquium Held at Liege 1959", Scientific Photography, Macmillan, pp. 321 & 322.
W. D. Kelly, "Purification and Chemical Sensitization of Photographic Gelatin", The Journal of Photographic Science, vol. 6, pp. 16-22, 1958.
Eastman Kodak Company
Kittle John E.
Sham Mukund J.
Thomas Carl O.
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