Patent ID: 6063836
Filing Date: 2000-05-16
Classification: B41M,C09D,Y10S,Y10T

Abstract:
An ink composition for use with a printing paper having a surface layer including an intercalated ion exchangeable compound, said ink composition consisting essentially of:water;at least one alcohol;a water soluble cationic dye having the formula ##STR8## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, R.sup.8, R.sup.9, R.sup.10, R.sup.11 and R.sup.12 independently represent a hydrogen atom, a halogen atom, a cyano group, an alkyl group, a cycloalkyl group, an alkoxy group, an aryl group, an aryloxy group, an aralkyl group, an aralkoxy group, an alkenyl group, an alkenoxy group, an alkoxycarbonyl group, an acyloxy group or an acyl group; R.sup.1 and R.sup.2 ; R.sup.3 and R.sup.4, R.sup.7 and R.sup.8 ; R.sup.9 and R.sup.10 ; R.sup.10 and R.sup.11 ; and R.sup.11 and R.sup.12 may be bonded to each other to form a ring; andZ.sup.- represents a hydrophillic counter ion comprising a salt of a strong acid.