Patent ID: 7316475

Claim:
The method of printing an aqueous inkjet ink by thermal inkjet printing from a heater having a surface which contacts ink to be expelled by heat, said heater having a heater stack volume defined by a volume of a heating material generally coextensive with said surface, plus a volume of heat-conductive protective material generally coextensive with said surface occupying substantially all of a region between said heating material and said surface, said ink having silver metal particles about 132 nm or less in diameter, comprising delivering to said heater stack about 2.9×10 9 Joules/m 3 or larger of volume of said heater stack, wherein said silver particles are in the range of 12% by weight to about 27% by weight of the weight of said ink, said ink having viscosity of less than 3 mPa-s at 22 degrees C., and wherein said ink has greater than 0.9 mole fraction of water computed only with respect to the liquid components of said ink.