Patent ID: 6083673
Filing Date: 2000-07-04
Classification: G03C

Abstract:
An aqueous composition for black-and-white development of photographic products comprising:1) at least one regeneratable ferrous iron chelate in which Fe.sup.2+ is chelated by a complexing agent that is a polycarboxylic or aminopolycarboxylic acid or aromatic polyhydroxy compound, in an Fe.sup.2+ /complexing agent molar ratio of between 1 and 5,2) at least one codeveloper defined by the formula: ##STR18## wherein R.sup.1 and R.sup.2 individually represent, a substituted or unsubstituted alkyl group, or a group represented by the formula: ##STR19## wherein m is from 0 to 5 and n is 0 or 1, L represents ##STR20## wherein R.sup.8 is R.sup.9 or A--( Sol), R.sup.9 is H, alkyl or aryl, A represents ##STR21## wherein q is between 0 and 5, and y is between 1, and 3, (Sol) is a solubilizing group that is--CO.sub.2 H, --SO.sub.3 H, --NHSO.sub.2 R.sup.10, --SO.sub.2 NH.sub.2, --SO.sub.2 NHR.sup.10, polyhydroxyalkyl, ##STR22## wherein R.sup.10 is alkyl or aryl, R.sup.11 is OH, alkyl or aryl, and R.sup.12 is hydrogen, alkyl or aryl,R.sup.3 to R.sup.7 each separately represent hydrogen, an alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, or a group represented by the formula: ##STR23## wherein p is 0 or 1, X represents --O--, --S--, or --NR.sup.8 --,m, L, n, A, (Sol) and R.sup.8 are as defined above, provided that(a) for the R.sup.3 to R.sup.7 radicals, when m is 0, n must also be 0,(b) in the group A, q can only be equal to 0 if the (Sol) group is ##STR24## (c) at least one of the R.sup.1 to R.sup.7 radicals must contain a (Sol) group, and3) a buffer.