Patent number: 6171771
Abstract: This invention comprises a photographic element having a support bearing one or more silver halide emulsions and one or more DIR couplers of structure I or II below:
wherein:
Z is a moiety which can react with oxidized developer to release a coupling-off group;
R1 is a hydrogen atom or a substituent selected from the group consisting of halogen atom, alkyl, aryl, alkoxy, alkylthio, arylthio, amino, alkylamino, arylamino, carbonamido, carbamoyl, alkoxycarbonyl, aryloxycarbonyl, aryloxy, arylcarbonyl, alkylcarbonyl, sulphonyl and sulphonamido groups;
each of the R2 substituents is a halogen atom or a substituent selected from the group consisting of alkyl, aryl, alkoxy, alkylthio, arylthio, amino, alkylamino, arylamino, carbonamido, carbamoyl, alkoxycarbonyl, aryloxycarbonyl, aryloxy, arylcarbonyl, alkylcarbonyl, sulphonyl and sulphonamido groups;
X represents the atoms required to make a second ring which is aromatic and contains at least one nitrogen atom; and
n is between 0 and the num
Type:
Grant
Filed:
March 25, 1997
Date of Patent:
January 9, 2001
Assignee:
Eastman Kodak Company
Inventors:
Paul B. Merkel, Philip A. Allway, David A. Steele, Jerrold N. Poslusny
Patent number: 5981160
Abstract: A colour photographic silver halide material which contains in at least one layer at least one compound of the general formula (I) ##STR1## in which R.sub.1 means hydrogen, alkyl or acyl,R.sub.2, R.sub.3 mutually independently mean alkyl, cycloalkyl, alkenyl, aryl, halogen, OR.sub.4, SR.sub.5, NR.sub.6 R.sub.7, nitro, cyano, SO.sub.2 R.sub.8, COOR.sub.9, COR.sub.10 or hetaryl,R.sub.4, R.sub.5, R.sub.9 mutually independently mean alkyl, cycloalkyl, alkenyl, aryl or hetaryl,R.sub.6, R.sub.7 mutually independently mean H, R.sub.4, COR.sub.10, COOR.sub.9, SO.sub.2 R.sub.8,R.sub.8, R.sub.10 mutually independently mean alkyl, cycloalkyl, alkenyl, aryl, hetaryl or NR.sub.6 R.sub.7,n, m mean 0, 1, 2, 3 or 4 or two residues R.sub.2 or R.sub.3 may each mean a fused carbo- or heterocyclic ring or the compounds of formula I are linked to a polymer chain via R.sub.1, R.sub.2 or R.sub.3is distinguished by elevated storage stability.
Type:
Grant
Filed:
April 2, 1998
Date of Patent:
November 9, 1999
Assignee:
Agfa-Gevaert AG
Inventors:
Heinrich Odenwalder, Hans Langen, Jorg Hagemann, Klaus Henseler