Radiation imagery chemistry: process – composition – or product th – Silver halide colloid tanning process – composition – or product
Patent
1995-11-02
1997-06-10
Letscher, Geraldine
Radiation imagery chemistry: process, composition, or product th
Silver halide colloid tanning process, composition, or product
430413, 430415, 430434, 430435, 430440, 430448, 430598, 430599, 430600, G03C 106
Patent
active
056374399
ABSTRACT:
Negative images of super-high contrast can be formed by developing an exposed silver halide photographic photosensitive material in the presence of at least one compound selected from the compound of formula (1): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 independently represent a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group, R.sup.1 and R.sup.2, R.sup.3 and R.sup.4, R.sup.5 and R.sup.6, or R.sup.1 and R.sup.3, together with nitrogen atom to which they are attached, may form a ring; L.sup.1 and L.sup.2 independently represent an alkylene group, an arylene group or a repeated alkyleneoxy group having at least two repeated alkyleneoxy units, which groups may be optionally substituted; A represents an atom selected from hydrogen, carbon, nitrogen, oxygen and sulfur or a divalent linkage group constituted from these atoms; and m and n represent 0 or 1, and the compound of formula (2) ##STR2## wherein R.sup.7, R.sup.8 and R.sup.9 independently represent a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group; R.sup.7 and R.sup.8 together with nitrogen atom to which they are attached, may form a ring; L represents an alkylene group, an arylene group or a repeated alkyleneoxy group having at least two repeated alkyleneoxy units, which groups may be substituted or unsubstituted; and E represents --N(COR.sup.11)--, --N(CONR.sup.12 R.sup.13)--, --NR.sup.14 COCONR.sup.15 --, --N(COCONR.sup.16 R.sup.17)--, --N(SO.sub.2 R.sup.18)-- or --N (COOR.sup.19)--, where R.sup.11 --R.sup.19 independently represent a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group; and R.sup.12 and R.sup.13 or R.sup.16 and R.sup.17 together with nitrogen atom to which they are attached, may form a ring, with the proviso that when E represents --N(COR.sup.11)--, --N(CONR.sup.12 R.sup.13)--, --N(SO.sub.2 R.sup.18)-- or --N(COOR.sup.19)--, R.sup.9 is not a hydrogen atom.
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Hirata Kenji
Kaneko Satoshi
Ruger Reinhold
Tanaka Akira
E. I. Du Pont de Nemours and Company
Letscher Geraldine
Mitsubishi Paper Mills Ltd.
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