Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Patent
1995-06-06
1997-07-29
Schilling, Richard L.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
430569, G03C 1035
Patent
active
056520891
ABSTRACT:
A silver halide emulsion comprises silver halide grains 35% or more of the total projected area of which are tabular grains having a {100} plane as a main plane and having an average aspect ratio of 1.3 to 7.9 which have been prepared via at least nucleation and ripening procedures. The emulsion is characterized in that said ripening procedure is conducted with substantially no NH.sub.3 present in the system. In a preferred embodiment, the ripening procedure is followed by the addition of fine silver halide grains substantially free of screw dislocation defects and having a diameter of 0.15 .mu.m or less that causes crystal growth. The nucleation is effected by the simultaneous addition of a silver salt and a halide salt solution to a dispersant solution. The resulting nuclei have a Br.sup.- content of 60 mol % or more. Cl.sup.- is present in said dispersant solution in an amount of 10.sup.-5 mol/l or more before the simultaneous addition.
REFERENCES:
patent: 4063951 (1977-12-01), Bogg
patent: 4414304 (1983-11-01), Dickerson
patent: 4946772 (1990-08-01), Ogawa
patent: 5264337 (1993-11-01), Maskasky
patent: 5292632 (1994-03-01), Maskasky
patent: 5320938 (1994-06-01), House et al.
Fuji Photo Film Co. , Ltd.
Schilling Richard L.
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