Patent ID: 7872060

Claim:
An inkjet ink composition, comprising: a polyurethane material having a weight-average molecular weight ranging from about 50,000 to about 500,000, the polyurethane material present in an effective amount ranging from about 0.2 wt. % to about 5 wt. % of the ink composition; a solvent present in an effective amount ranging from about 5 wt. % to about 20 wt. % of the ink composition; an anionic surfactant present in an effective amount ranging from about 0.01 wt. % to about 3 wt. % of the ink composition, the anionic surfactant being selected from a phosphate ester surfactant having one of the following structures: wherein R is a hydrophobic moiety, and n is an integer ranging from 1 to 20; and a balance of the ink composition being water.