Heat development of silver halide element with redox dye releaser and stabilizer

DETAILED DESCRIPTION OF THE INVENTION The alkyl, cycloalkyl and aryl groups represented by R or the alkyl, cycloalkyl and aryl moieties of the groups represented by R may be substituted with a halogen atom, a hydroxy group, an alkoxy group, a cyano group, an aryloxy group, an alkyl group, an alkoxycarbonyl group or an aryloxycarbonyl group.
When p is 2 or more, the R's may be the same or different.
The alkyl, cycloalkyl and aryl groups represented by R.
sup.
1 may be substituted with a halogen atom, a hydroxy group, an alkoxy group, a cyano group, an aryloxy group, an alkyl group or an alkoxycarbonyl group.
When q is 2 or more, the R.
sup.
1 's may be the same or different.
When R represents a group containing one or more carbon atoms, the total number of the carbon atom(s) of the group inclusive of the substituent(s), if any, is preferably from 1 to 40, and more preferably from 1 to 20 carbon atoms.
Preferred examples of R include alkyl groups (for example, a methyl group, an ethyl group, a butyl group, an isoheptyl group, an octyl group, a tetradecyl group, etc.
), alkoxy groups (for example, a methoxy group, an ethoxy group, a butoxy group, etc.
), halogen atoms (for example, chlorine, bromine, fluorine, etc.
), and a hydrogen atom.
Of these, a hydrogen atom is particularly preferred.
It is preferred for the alkyl, alkenyl, cycloalkyl or aryl group represented by R.
sup.
1 to have 60 or less carbon atoms inclusive of the substituent(s) thereof, if any.
In formula (A), R.
sup.
1 is preferably an alkyl group having from 1 to 40, and more preferably from 1 to 20 carbon atoms, a cycloalkylalkyl group having from 6 to 46, and more preferably from 6 to 26 carbon atoms, an alkenyl group having from 2 to 40, and more preferably 2 to 20 carbon atoms, an alkoxyalkyl group having from 3 to 60, and more preferably from 3 to 40 carbon atoms, or an alkoxycarbonylalkyl group having from 3 to 60, and more preferably from 3 to 40 carbon atoms.
Preferred examples of the alkyl group represented by R.
sup.
1 include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a pentyl group, a hexyl group, a 2-ethylbutyl group, an isoheptyl group, an octyl group, a 2-ethylhexyl group, an isodecyl group, a dodecyl group, an isododecyl group, a tetradecyl group, a hexadecyl group, an isooctadecyl group, etc