Patent ID: 7214259
Filing Date: 2007-05-08
Classification: C09B,C09D,C09K

Abstract:
1. An ink jet printer cartridge comprising a chamber and an ink wherein the ink is present in the chamber and the ink comprises a liquid medium and a colorant, wherein the liquid medium comprises water and a water-miscible organic solvent and the colorant is of Formula (1), or a salt thereof, wherein the colorant is dissolved in the liquid medium: wherein: each X independently is a water-solubilising group selected from the group consisting of sulfo, carboxy, phosphato and poly(ethylene oxide); each Z independently is optionally substituted alkyl, optionally substituted aryl or optionally substituted aralkyl; each Q independently is a direct bond or —NR— wherein R is H, optionally substituted aryl or optionally substituted alkyl; rings A,B,C and D are each independently unsubstituted or carry a substituent selected from the group consisting of optionally substituted alkyl, optionally substituted aryl and optionally substituted aralkyl; each n independently is from 1 to 3; and each m independently is 0, 1 or 2; provided that when either or both of the groups represented by Q is a direct bond then at least one n has a value of at least 2.