Patent ID: 7728062

Claim:
An ink composition, comprising: an aqueous vehicle; a modified pigment, the modified pigment comprising pigment B represented by the formula: wherein R1 can be selected from the following: H and methyl, wherein R2 can be selected from the following: an alkyl group, wherein the value of x, y1, and y2 correspond to an acid number that is from about 3 to 500, wherein the value of x, y1, and y2 correspond to a glass transition temperature of about −30 to 120° C., wherein the value of k is about 0 to 100% of the value of y1, wherein the value of z is about 5 to 80% of the value of y1, wherein PEG is polyethylene glycol and PPG is polypropylene glycol, wherein ● is a pigment, and wherein a percentage of PEG, PPG, and combinations thereof, grafted onto the styrene-acrylic co-polymer backbone of pigment B is about 0.01 to 90% based on the reactive carboxylic acid groups.