Patent ID: 8580024

Claim:
An inkjet ink composition comprising a liquid vehicle and at least one modified pigment, wherein the modified pigment comprises the reaction product of: a) a pigment and b) at least one reagent having the formula H 2 N-A-Y, wherein Y is H, a C1-C12 alkyl group, an aromatic group, a polymeric group, or a group comprising a —C(O)A-NH 2 group, and A is O, NH, or S, wherein the pigment is selected from oxidized carbonaceous pigments, non-oxidized carbonaceous pigments, and non-modified pigments and; wherein Y further comprises at least one second group selected from: (i) at least one ionic group, at least one ionizable group, or a mixture of at least one ionic group and at least one ionizable group; (ii) at least one sulfonic acid group or salt thereof, at least one carboxylic acid group or salt thereof, at least one amine group, or at least one ammonium group; (iii) at least one geminal bisphosphonic acid group, partial esters thereof, or salts thereof; (iv) at least one group having the formula —CQ(PO 3 H 2 ) 2 , partial esters thereof, or salts thereof, wherein Q is H, R, OR, SR, or NR 2 , wherein R, which can be the same or different, is H, a C1-C18 alkyl group, a C1-C18 acyl group, an aralkyl group, an alkaryl group, or an aryl group; or (v) at least one group having the formula —CO—Z—CH(PO3H2) 2 or —SO2-Z—CH(PO3H2)2 or salts thereof, wherein Z is O, S, or NR′ and R′ is H, a C1-C18 alkyl group, a C1-C18 acyl group, an aralkyl group, an alkaryl group, or an aryl group.