| (19) |
 |
|
(11) |
EP 1 136 875 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
13.08.2003 Bulletin 2003/33 |
| (43) |
Date of publication A2: |
|
26.09.2001 Bulletin 2001/39 |
| (22) |
Date of filing: 12.03.2001 |
|
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| (84) |
Designated Contracting States: |
|
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
Designated Extension States: |
|
AL LT LV MK RO SI |
| (30) |
Priority: |
24.03.2000 US 534378
|
| (71) |
Applicant: EASTMAN KODAK COMPANY |
|
Rochester, New York 14650 (US) |
|
| (72) |
Inventors: |
|
- Fenton, David E., c/o Eastman Kodak Company
Rochester, New York 14650-2201 (US)
- Nelson, Roger W., c/o Eastman Kodak Company
Rochester, New York 14650-2201 (US)
- Muenter, Annabel A., c/o Eastman Kodak Company
Rochester, New York 14650-2201 (US)
|
| (74) |
Representative: Haile, Helen Cynthia et al |
|
Kodak Limited Patent, W92-3A, Headstone Drive
Harrow, Middlesex HA1 4TY
Harrow, Middlesex HA1 4TY (GB) |
|
| |
|
| (54) |
Small 3D emulsions with enhanced photographic response |
(57) A silver halide photographic element comprises at least one silver halide emulsion
layer comprising 3D emulsion grains having an equivalent spherical diameter of less
than or equal to 0.35 µm and said layer further comprises a fragmentable electron
donor compound of the formula X-Y' or a compound which contains a moiety of the formula
-X-Y'; wherein
- X is an electron donor moiety, Y' is a leaving proton H or a leaving group Y, with
the proviso that if Y' is a proton, a base, β-, is covalently linked directly or indirectly
to X, and wherein:1) X-Y' has an oxidation potential between 0 and about 1.4 V; and2)
the oxidized form of X-Y' undergoes a bond cleavage reaction to give the radical X*
and the leaving fragment Y'; and3) the radical X* has an oxidation potential ≤-0.7V
(that is, equal to or more negative than about -0.7V).