Patent ID: 7125446

Claim:
A yellow ink jet ink composition for ink jet printing comprising a dye represented by Formula I, water and a humectant: wherein: R 1 is a hydrogen or a substituted or unsubstituted alkyl, aromatic or heterocyclic group; R 2 and R 4 independently hydrogen or a non-metallic substituent; R 3 is hydrogen or a substituted or unsubstituted alkyl, acyl, sulfonyl, aromatic or heterocyclic group; R 5 is a substituted or unsubstituted alkyl, aromatic or heterocyclic group; and X is an electron withdrawing group having a Hammet σ p value of 0.4 or greater; with the proviso at least one of R 1 , R 2 , R 3 , R 4 and R 5 comprises a group capable of imparting water solubility to the dye.