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Tailored ink for piston driven electrostatic liquid drop modulator

United States Patent

April 19, 2005
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
The present invention relates to an ink composition including water, a solvent, a solvent-soluble dye, and a surfactant, where the ink exhibits a stable liquid microemulsion phase at a first temperature and a second temperature higher than the first temperature and has a conductivity of at most about 200 .mu.S/cm and a dielectric constant of at least about 60, and methods of making such ink compositions. The present invention also relates to a method of making an ink composition for use in a microelectromechanical system-based fluid ejector. The method involves providing a solution or dispersion including a dye or a pigment and adding to the solution or dispersion an additive which includes a material that enhances dielectric permittivity and/or reduces conductivity under conditions effective to produce an ink composition having a conductivity of at most about 200 .mu.S/cm and a dielectric constant of at least about 60.
Wong; Raymond W. (Mississauga, CA), Breton; Marcel P. (Mississauga, CA), Bedford; Christine E. (Toronto, CA), Carreira; Leonard M. (Penfield, NY), Gooray; Arthur M. (Penfield, NY), Roller; George J. (Penfield, NY), Zavadil; Kevin (Benalillo, NM), Galambos; Paul (Albuquerque, NM), Crowley; Joseph (Morgan Hill, CA)
Xerox Corporation (Stamford, CT), Sandia Corporation (Albuquerque, NM)
10/ 345,426
January 15, 2003
This invention was developed with governmental support under U.S. Department of Energy Contract No. DE-AC04-94AL85000. The U.S. Government may have certain rights in this invention.