(19)
(11) EP 0 617 320 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.02.1995 Bulletin 1995/05

(43) Date of publication A2:
28.09.1994 Bulletin 1994/39

(21) Application number: 94104414.1

(22) Date of filing: 21.03.1994
(51) International Patent Classification (IPC)5: G03C 1/005, G03C 1/34
(84) Designated Contracting States:
BE CH DE FR GB IT LI NL

(30) Priority: 22.03.1993 US 34317

(71) Applicant: EASTMAN KODAK COMPANY
Rochester, New York 14650-2201 (US)

(72) Inventors:
  • Lok, Roger, Eastman Kodak Company
    Rochester, New York 14650-2201 (US)
  • Budz, Jerzy Antoni, Eastman Kodak Company
    Rochester, New York 14650-2201 (US)

(74) Representative: Brandes, Jürgen, Dr. rer. nat. et al
Wuesthoff & Wuesthoff Patent- und Rechtsanwälte Schweigerstrasse 2
81541 München
81541 München (DE)


(56) References cited: : 
   
       


    (54) Tabular grain emulsions containing antifoggants and stabilizers


    (57) A radiation sensitive emulsion stabilized against changes in sensitivity and fog upon aging is disclosed. The radiation sensitive emulsion contains a silver halide grain population comprising at least 50 mole percent chloride, based on silver, wherein at least 50 percent of the grain population projected area is accounted for by tabular grains (a) bounded by {100} major faces having adjacent edge ratios of less than 10, and (b) each having an aspect ratio of at least 2. The emulsion contains a stabilizer which is (A) a mercapto heterocyclic nitrogen compound containing a mercapto group bonded to a carbon atom which is linked to an adjacent nitrogen atom in a heterocyclic ring system, (B) a quaternary aromatic chalcogenazolium salt wherein the chalcogen is sulfur, selenium or tellurium, (C) a triazole or tetrazole containing an ionizable hydrogen bonded to a nitrogen atom in a heterocyclic ring system, (D) a dichalcogenide compound comprising an -X-X- linkage between carbon atoms wherein each X is divalent sulfur, selenium or tellurium, (E) an organic compound containing a thiosulfonyl group having the formula -SO₂SM where M is a proton or cation, (F) a mercuric salt, or (G) a quinone compound. Photographic elements, particularly color photographic elements containing this emulsion are also disclosed.






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