SPACER PARTICLES FOR PHOTO ELECTROPHORETIC IMAGING
Original Publication Date: 1979-Aug-31
Included in the Prior Art Database: 2004-Apr-02
Xerox Disclosure Journal
For the purpose of eliminating dark spots which appear on images produced on dielectric webs by means of the photoelectrophoretic imaging method, inert, small spacer particles are included in the imaging suspension. The dark spots in the images have been determined to be caused by field variations due to a sag in the conductive web. The sag is prevented by incorporating particles having a diameter in the range of from about 5 to about 10 microns in the imaging suspension. Typical inert particles are calcium carbonate, magnesium oxide, zinc oxide and polystyrene spheres. These spacer particles prevent the sag in the webs when added to the imaging suspension in amounts of from about 2 to 3 percent by weight.