Patent ID: 8632630

Claim:
A thermal ink jet ink composition comprising: one or more volatile organic solvents, wherein the one or more volatile organic solvents are selected from C 1 -C 4 alcohols, C 3 -C 6 ketones, C 3 -C 6 esters, C 4 -C 8 ethers, and mixtures thereof, wherein the one or more volatile organic solvents are present in an amount at least 60% by weight of the ink composition; one or more humectants, wherein the humectants are present in an amount at least 2% by weight and not more than 30% by weight of the ink composition; one or more binder resins, wherein the one or more binder resins are present in an amount from 0.3% to 8% by weight of the ink composition; and one or more dyes, wherein if water is present, it is present in amount up to 5% by weight of the ink composition, wherein the ink composition is suitable for use in a thermal ink jet printer and wherein the ink composition has a slow rate of kogation such that it is capable of being printed at least 10 million drops per nozzle from the thermal ink jet printer before drop weight of the ink composition is reduced by more than 10%.