Abstract: An improved spectrally sensitized ultrathin tabular grain emulsion is disclosed in which tabular grains (a) having {111} major faces, (b) containing greater than 70 mole percent bromide, based on silver, (c) accounting for greater than 90 percent of total grain projected area, (d) exhibiting an average equivalent circular diameter of at least 0.7 .mu.m, (e) exhibiting an average thickness of less than 0.07 .mu.m, and (f) having latent image forming chemical sensitization sites on the surfaces of the tabular grains, are spectrally sensitized and improved by employing in forming the surface chemical sensitization sites at least one silver salt epitaxially located on the tabular grains.
Type:
Grant
Filed:
December 19, 1994
Date of Patent:
February 27, 1996
Assignee:
Eastman Kodak Company
Inventors:
Richard L. Daubendiek, Donald L. Black, Joseph C. Deaton, Timothy R. Gersey, Joseph G. Lighthouse, Myra T. Olm, Xin Wen, Robert D. Wilson