(19)
(11) EP 0 922 994 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.01.2007 Bulletin 2007/02

(43) Date of publication A2:
16.06.1999 Bulletin 1999/24

(21) Application number: 98204077.6

(22) Date of filing: 30.11.1998
(51) International Patent Classification (IPC): 
G03C 1/035(2006.01)
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 11.12.1997 EP 97203897

(71) Applicant: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS)
75794 Paris Cedex 16 (FR)

(72) Inventors:
  • De Keyzer, René
    2640 Mortsel (BE)
  • Treguer, Mona
    75012 Paris (FR)
  • Belloni-Cofler, Jaqueline
    91120 Lozere (FR)
  • Hynd, Remita
    91190 Gif/Yvette (FR)

(74) Representative: Sueur, Yvette 
Cabinet SUEUR et L'HELGOUALCH, 109, boulevard Haussmann
75008 Paris
75008 Paris (FR)

   


(54) A photosensitive silver halide element with increased photosensitivity


(57) A photosensitive element comprising a silver halide emulsion having silver halide grains containing an organic hole-trapping dopant. In a preferred embodiment said dopant is represented by formula (I):

        R-COOM     (I)

wherein
R is hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aralkyl group or hetero-aryl group, and
M is hydrogen or any metal or organic group which can form a salt
or by formula (II):

wherein :
X and Y are independently selected from O, S, Se,
m is 1 and n is 1 or 2,
R1 and R2 are hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl or aralkyl group or a substituted or unsubstituted heteroaryl group, wherein R1 and R2 may be the same or different and may form a ring,
E represents a group linked to the carbon atom by a heteroatom, having at least one free electron pair,
M+ is a proton or an organic or inorganic (metal) counterion.
Moreover the invention provides a photosensitive element where said photosensitive element can be a photoadressable thermographic element. The invention also provides a method for preparing said photosensitive element comprising a support and on one or both sides thereof at least one silver halide emulsion layer wherein the silver halide grains are doped with an organic hole-trapping dopant according to formula (I) or (II), optionally carried out in the presence of a oxidizing agent.





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