| (19) |
 |
|
(11) |
EP 0 136 582 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
23.09.1987 Bulletin 1987/39 |
| (43) |
Date of publication A2: |
|
10.04.1985 Bulletin 1985/15 |
| (22) |
Date of filing: 05.09.1984 |
|
|
| (84) |
Designated Contracting States: |
|
BE DE FR GB |
| (30) |
Priority: |
20.09.1983 IT 6521383
|
| (71) |
Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY |
|
() |
|
|
| |
|
| (54) |
Developer compositions for silver halide photographic materials |
(57) Developer compositions for silver halide photographic materials having an improved
resistance to air oxidation. even if in the presence of metal ion traces, comprise
the following principal constituents:
a) hydroquinone or a substituted hydroquinone;
b) an auxiliary superadditive developing agent.
c) an alkali metal sulfite;
d) an organic antifoggant agent;
e) inorganic alkali agents;
f) an alkanolamine; and
g) a sequestering agent selected in the group of diethylenetetraminepentacetic acid,
1,3-diamino-2-propanoltetracetic acid and 1-hydroxyethylidene-1.1'- diphosphonic acid.