Photographic element containing a polymeric phosphoniom mordent.

摘要

Phosphonium mordanting polymer, that is capable of fixing acid dyes, characterized in that said mordanting polymer comprises randomly distributed recurring units corresponding to the general formula (I) wherein: A represents a unit that is derived from a copolymerizable monomer having a hydrophobic character e.g. acrylonitrile, n represents an integer of from 1 to about 12; each of R1, R2 and R3 (same or different) represents a C1-C8 alkyl group a cycloalkyl group or an aryl group X<-> represents an acid anion e.g. a halogen anion, or an anion derived from an inorganic acid x+y+z represents from about 2 mole % to about 70 mole % with y+z maximum 15 mole % and w represents from about 30 mole % to about 98 mole %.