Pigment ink jet ink compositions for high resolution printing
AssigneeXerox Corporation
InventorsJohn Wei-Ping Lin, Gary R. Fague, Raymond R. Wong
Life of this patent
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Abstract
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 (>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.
Claims24
An aqueous ink jet ink composition comprising:
- a) a pigment having a particle size distribution where the pigment particles have an average size or diameter >0.1 micron and at least 50% of said pigment particles have an average diameter or size .ltoreq.0.3 micron with the remaining pigment particles having a diameter or size .ltoreq.3.0 microns,
- b) a dispersant which is a reaction product of an aldehyde and a naphthalene sulfonate salt, and
- c) water,
- wherein a portion of the pigment particles have a diameter or size .gtoreq.0.1 micron but .ltoreq.3.0 microns.
An aqueous ink jet ink composition comprising:
- a) a pigment having a particle size distribution where the pigment particles have an average size or diameter >0.1 micron and at least 50% of said pigment particles have an average diameter or size .ltoreq.0.3 micron with the remaining pigment particles having a diameter or size .ltoreq.3.0 microns,
- b) a solvent selected from the group consisting of sulfone and sulfoxide,
- c) an anionic dispersant comprising a reaction product of an aldehyde and a naphthalene sulfonate salt, and
- d) water,
- wherein a portion of the pigment particles have a diameter or size >0.1 micron but .ltoreq.3.0 microns;
- wherein the ink jet ink composition has a latency >10 seconds when it is jetted in a high resolution printhead having a resolution of >360 spi.
A process for preparing an aqueous ink jet ink composition comprising the steps of:
- forming a pigment dispersion comprising a dispersant and pigment particles, wherein the dispersant is a reaction product of an aldehyde and a naphthalene sulfonate salt;
- mixing the pigment dispersion with a solvent and water by a method selected from the group consisting of homogenization, sonification, mechanical mixing, microfluidization magnetic mixing, and high speed mixing;
- and
- removing pigment particles greater than 3.0 microns and less than 0.1 microns in diameter or size.
An aqueous ink jet ink composition comprising:
- a) a chemically modified pigment comprising a water ionizable group selected from the group consisting of carboxylic acid salts, sulfonic acid salts, phosphate salts, phosphoric acid salts, mixtures thereof, and ammonium groups and having a particle size distribution where at least 50% of said pigment particles have an average diameter or size .ltoreq.0.3 micron with the remaining pigment particles having a diameter or size .ltoreq.3.0 microns,
- b) a dispersant that is a reaction product of an aldehyde and a napthalene sulfonate salt, and
- c) water,
- wherein a portion of the pigment particles have a diameter or size >0.1 micron but .ltoreq.3.0 microns;
- and said ink jet ink composition is jetted in an ink jet printer by at least a high resolution printhead having a resolution of >360 spi.
An aqueous ink jet ink composition comprising:
- a) a chemically modified pigment comprising a water ionizable group selected from the group consisting of carboxylic acid salts, sulfonic acid salts, phosphate salts, phosphoric acid salts, mixtures thereof, and ammonium groups and having a particle size distribution where at least 50% of said pigment particles have an average diameter or size .ltoreq.0.3 micron with the remaining pigment particles having a diameter or size .ltoreq.3.0 microns,
- b) a solvent selected from the group consisting of sulfones and sulfoxides,
- c) an anionic dispersant comprising a reaction product of an aldehyde and a naphthalene sulfonate salt and
- d) water,
- wherein a portion of the pigment particles have a diameter or size >0.1 micron but .ltoreq.3.0 microns;
- and said ink jet ink composition is jetted in an ink jet printer by at least a high resolution printhead having a resolution of >360 spi.
Dependencies are inferred from the claim text.