Patent ID: 7160933

Claim:
An ink composition comprising water, a humectant, and polymer-dye particles, wherein said polymer-dye particles comprise a colorant phase containing a water insoluble dye of formula (I), and a polymer phase, said phases having an interface between them, and said particles being associated with a co-stabilizer wherein R 1 represents hydrogen, halogen, a substituted or unsubstituted alkyl, alkenyl or alkynyl group, a substituted or unsubstituted allyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group or polyoxyalkylene group; a cyano, carboxy, acyl, carboxyalkyl, nitro, sulfo, or amino group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkoxy- or aryloxy-carbonyl group, a ureido group, a carbamoyl group, a substituted or unsubstituted alkyl-, arylalkyl-, aryl-, diaryl- or dialkyl-carbamoyl group, a sulfamoyl group, a substituted or unsubstituted alkyl-, arylalkyl-, aryl-, diaryl- or dialkyl-sulfamoyl group, a sulfonyl group, an acylamino group, a sulfonylamino group, a substituted or unsubstituted alkyl-, aralkyl-, aryl-, diaryl- or dialkyl-amino group; a substituted or unsubstituted heteroalkyl group, or an acyl group; R 2 represents hydrogen, a substituted or unsubstituted alkyl, alkenyl or alkynyl group, a substituted or unsubstituted allyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group or polyoxyalkylene group, a substituted or unsubstituted carboxyalkyl group, a substituted or unsubstituted acyl, amido or sulfo group, or a substituted or unsubstituted alkoxy- or aryloxy-carbonyl group; R 3 has a Pi of 0 to 1.5; and R 4 has a Pi of greater than or equal to 1.0.