Patents Represented by Attorney Judith L. Bgorick
  • Patent number: 7186762
    Abstract: Disclosed is a process for preparing a phase change ink composition which comprises (a) a phase change ink carrier, said carrier comprising at least one nonpolar component and at least one polar component, and (b) pigment particles, said process comprising (1) selecting at least one of the polar carrier components to be a pigment particle dispersant; (2) admixing the pigment particles with the dispersant; (3) extruding the mixture of pigment particles and dispersant in an extruder at a temperature that is at or above about the peak crystallization temperature of the dispersant and below about the peak melting temperature of the dispersant, thereby forming a pigment dispersion; (4) subsequent to extrusion of the pigment dispersion, adding to the pigment dispersion any remaining polar components and the nonpolar component; and (5) subjecting the resulting mixture of pigment dispersion, polar component, and nonpolar component to high shear mixing to form an ink.
    Type: Grant
    Filed: November 25, 2003
    Date of Patent: March 6, 2007
    Assignee: Xerox Corporation
    Inventors: Raymond W. Wong, Hadi K. Mahabadi, Paul F. Smith, Sheau V. Kao, Michael S. Hawkins, Caroline M. Turek