Patent ID: 6548703
Filing Date: 2003-04-15
Classification: C07C,C09B

Abstract:
A mixed coupler composition consisting essentially of:a) a hydroxynaphthalene monocarboxylic acid or a derivative thereof, and b) a compound having the formula [1]: whereinY is â€”(CONH)n-X or â€”COR, Y1 is â€”(CONH)n-X1 or â€”COR1, wherein X and X1 are optionally branched alkyl groups having 1-20 carbon atoms, optionally substituted aromatic groups, or optionally substituted heterocyclic groups having conjugated double bonds, n is an integer of 1 or 2, R and R1 are hydroxy groups, optionally branched alkoxy groups having 1-6 carbon atoms, benzyloxy groups, phenyloxy groups or phenacyloxy groups, provided that when either R or R1 is a hydroxy group, said group may optionally form an acceptable salt, R2 is a hydrogen atom, an optionally branched alkyl group having 1-6 carbon atoms, an acyl group having 1-6 carbon atoms or a phenyl alkyl group.