Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Patent
1996-07-09
1998-03-10
Huff, Mark F.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
430569, 430603, 430605, G03C 1005, G03C 1035
Patent
active
057260060
ABSTRACT:
A photosensitive emulsion is disclosed comprised of a dispersing medium and silver halide grains containing at least 80 mole percent bromide, based on silver, wherein at least 50% of the projected area of said silver halide grains is accounted for by tabular grains free of twin planes having {100} parallel major faces, said emulsion being chemically sensitized and having a reciprocity failure of less than 35 sensitivity units between exposures of respectively 10.sup.-5 seconds and 100 seconds. The emulsion can be employed as a latent image forming emulsion in a photographic element.
The emulsion can be prepared by a process preparing a silver bromide photosensitive emulsion, comprising the following essential steps: (a) a nucleation step whereby a fine-grain emulsion with a pAg of between 4 and 6.5 and a pH of between 2 and 5 is precipitated, while maintaining, at the start of the nucleation and for a short time, a stoichiometric excess concentration of silver corresponding to a pAg of less than 5, and (b) a physical ripening step, at a pAg of between 8 and 9.5 and a pH of between 6 and 8.
REFERENCES:
patent: 4063951 (1977-12-01), Bogg
patent: 4386156 (1983-05-01), Mignot
patent: 5565314 (1996-10-01), Nakatsu et al.
Friour Gerard Amede Desire
Gourlaouen Luc Renaud
Jezequel Pierre-Henri
Jordi Frederic Xavier
Lebrat Jean-Pascal Francis
Eastman Kodak Company
Huff Mark F.
Thomas Carl O.
LandOfFree
Tabular grain silver halide emulsions, a method for their prepar does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tabular grain silver halide emulsions, a method for their prepar, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tabular grain silver halide emulsions, a method for their prepar will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-138145