Patent ID: 7060425
Filing Date: 2006-06-13
Classification: C07D,C08K,G03C

Abstract:
1. A process for preventing the migration of oxidised developer in a colour photographic material from a light sensitive silver halide emulsion layer in which it has been formed into another silver halide emulsion layer containing colour couplers comprising the steps of: incorporating a compound of the formula I wherein, if n=1, R and, if n=2, R R  C or R or, if R  wherein R R R  C  C  C  C  or R  C  C  C  C  C  C  or  or, in formula II, R R R R  C  or a group of the formula IIIa or IIIb R R R R  C  and which is unsubstituted or substituted at the phenyl moiety by 1 to 3 C R R  C  or R R R  C  or R  C R R R R L is a linking group of valency (k+1) and is as a divalent group —O—; Q—C —O—CH —Q—C —O—C Q-phenylene-Q or Q-phenylene-D-phenylene-Q with D being C L as a trivalent group is Q-capped C —Q—C —O—C L as a tetravalent group is a tetravalent residue of a hexose or a hexitol; —Q—C —O—C  or a group M is an r-valent metal cation; Q is oxygen or —NH—; X is a direct bond, oxygen, sulphur or —NR Z is a linking group of valency (k+1) and is as a divalent group C Z as a trivalent group is C Z as a tetravalent group is a tetravalent, carbon-ended residue of a hexose or a hexitol, C  or a group a, b, c and k independently are 1, 2 or 3; m is 0 or a number from the range 1–12; n is 1 or 2; q is 1, 2, 3, 4, 5 or 6; r is 1, 2 or 3; and s is 0, 1 or 2; v is 1, 2, 3, 4, 5, 6, 7 or 8; provided that, when R