Patent ID: 6022908
Filing Date: 2000-02-08
Classification: C09D

Abstract:
A set of printing liquids, comprising:a first anionic printing liquid comprisingan aqueous vehicle,at least one first pigmented colorant, andat least one first anionic polymer for dispersing said first pigmented colorant thereby providing a first dispersed pigment;a second anionic printing liquid comprisingan aqueous vehicle;at least one second pigmented colorant,at least one second anionic polymer for dispersing said second pigmeneted colorant thereby providing a second dispersed pigment, andan acid additive having a pKa up to the pKa of the at least first dispersed pigment of the first liquid;a third cationic printing liquid comprisingan aqueous vehicle,at least one third colorant,at least one third cationic polymer, anda pH in the range from about 2 to about 5; anda fourth anionic printing liquid comprisingan aqueous vehicle,at least one fourth anionic dye, anda precipitating agent.