Patent ID: 8710116

Claim:
An aqueous inkjet ink composition comprising: (a) a self-dispersing pigment; (b) an aqueous vehicle; and (c) a structured polymer that is soluble in the aqueous vehicle, wherein said structured polymer is either i) a soluble AB or ABC block copolymer with an A block of benzyl methacrylate; or ii) a soluble graft copolymer, wherein said graft copolymer comprises 50-90% by weight, of a polymeric backbone and 10-50% by weight, of macromonomer side chains attached to the backbone at a single terminal point, and said graft copolymer has a weight average molecular weight of 5,000-100,000, wherein (i′) the polymeric backbone is hydrophobic in comparison to the side chains and consists essentially of polymerized phenoxyethylacrylate and ethoxytriethyleneglycol methacrylate, and up to 20% by weight, based on the weight of the graft copolymer, of polymerized methacrylic acid; and (ii′) the macromonomer sidechains have a weight average molecular weight of about 1,000-30,000 and consist of polymerized ethoxytriethyleneglycol methacrylate and 2-100% by weight, based on the weight of the macromonomer side chains, of polymerized methacrylic acid.