Xerox Corporation

Raymond R Wong

John Wei-Ping Lin

Gary R Fague

An aqueous ink jet ink composition having a pigment wherein at least 50% of the pigment particles have an average diameter or size&lE;0.3 microns with the remaining particles in the ink composition having a diameter or size&lE;3.0 microns, water, a dispersant which is a reaction product of an aldehyde and a naphthalene sulfonate salt, and/or a sulfone solvent. The aqueous ink jet ink possesses a latency of at least 10 seconds at a relative humidity of 15% in either a high resolution (>360 spi) printhead or full-width array printhead having at least one nozzle opening of a diameter or size ranging from 10 to about 49 microns.

Pigment ink jet compositions for high resolution printing

An aqueous ink jet ink composition having a pigment wherein at least 50% of the pigment particles have an average diameter or size .ltoreq.0.3 microns with the remaining particles in the ink composition having a diameter or size .ltoreq.3.0 microns, water, a dispersant which is a reaction product of an aldehyde and a naphthalene sulfonate salt, and/or a sulfone solvent. The aqueous ink jet ink possesses a latency of at least 10 seconds at a relative humidity of 15% in either a high resolution (&gt;360 spi) printhead or full-width array printhead having at least one nozzle opening of a diameter or size ranging from 10 to about 49 microns.

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Mississauga, Canada

Raymond R Wong