(19)
(11) EP 0 650 086 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.09.1995 Bulletin 1995/39

(43) Date of publication A2:
26.04.1995 Bulletin 1995/17

(21) Application number: 94202729.3

(22) Date of filing: 22.09.1994
(51) International Patent Classification (IPC)6: G03C 1/06, G03C 1/26, G03C 1/09
(84) Designated Contracting States:
BE CH DE FR GB IT LI NL

(30) Priority: 24.09.1993 GB 9319792

(71) Applicants:
  • KODAK LIMITED
    Harrow, Middlesex HA1 4TY (GB)

    GB 
  • EASTMAN KODAK COMPANY
    Rochester, New York 14650-2201 (US)

    BE CH DE FR IT LI NL 

(72) Inventors:
  • Pich, Julia, c/o Kodak Limited
    Harrow, Middlesex, HA1 4TY (GB)
  • Baker, Julie, c/o Kodak Limited
    Harrow, Middlesex, HA1 4TY (GB)
  • Pightling, Nicholas, c/o Kodak Limited
    Harrow, Middlesex, HA1 4TY (GB)

(74) Representative: Baron, Paul Alexander Clifford 
Kodak Limited Patent Department Headstone Drive
Harrow Middlesex HA1 4TY
Harrow Middlesex HA1 4TY (GB)


(56) References cited: : 
   
       


    (54) Photographic silver halide materials


    (57) A method of improving abrasion resistance and sensitivity to variations in development time of a photographic material comprising a support bearing a silver halide emulsion layer comprising at least 50% silver chloride which contains in or adjacent the emulsion layer a hydrazide nucleating agent and an amine booster, the combination of which is capable of providing high contrast images, sensitised to radiation having a wavelength from 600 to 700 nm characterised by sensitising the emulsion wih a tricyclic merocyanine dye of the general formula:


       wherein R¹, and R² are each hydrogen or a substituted or unsubstituted alkyl group of 1-5 carbon atoms, and
       R³, R⁴ and R⁵ are each a substituted or unsubstituted alkyl group of 1-5 carbon atoms, and wherein at least one of R³, R⁴ and R⁵ contain a water-solubilising group,
       X is a counter-ion, and
       n is 0-3.





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