US 7,541,060 B2
Bichromal balls
San-Ming Yang, Mississauga (Canada); Thomas Edward Enright, Tottenham (Canada); Aurelian Valeriu Magdalinis, Aurora (Canada); Ahmed Abd Alzamly, Mississauga (Canada); Man-Chung Tam, Mississauga (Canada); Carol Ann Jennings, Toronto (Canada); Peter M. Kazmaier, Mississauga (Canada); Marko D. Saban, Etobicoke (Canada); and Michael Steven Hawkins, Cambridge (Canada)
Assigned to Xerox Corporation, Norwalk, Conn. (US)
Filed on Aug. 17, 2004, as Appl. No. 10/919,814.
Prior Publication US 2006/0040050 A1, Feb. 23, 2006
Int. Cl. B05D 7/00 (2006.01)
U.S. Cl. 427—212  [264/8; 264/5; 264/10; 264/203; 264/210.7; 264/210.8; 427/222; 427/213.34; 428/323; 428/40.2; 428/38; 210/137; 359/296] 7 Claims
OG exemplary drawing
 
1. A process for forming bichromal balls adapted for display applications at temperatures greater than 40° C., said process comprising: providing a polyethylene wax having a molecular weight distribution of about 200 to about 3000; providing an isoparaffin solvent; extracting said polyethylene wax with said isoparaffin solvent to remove a fraction of said polyethylene wax from a remaining purified portion of said polyethylene wax, said fraction having an average molecular weight of less than 700; and forming bichromal balls adapted for display applications at temperatures greater than 40° C. from said purified portion of said polyethylene wax, wherein said forming of the bichromal balls from said purified polyethylene wax includes: mixing said purified polyethylene wax with a first pigment to produce a first wax material; mixing said purified polyethylene wax with a second pigment to produce a second wax material; heating said first wax material to a temperature greater than the melting temperature of said first wax material; heating said second wax material to a temperature greater than the melting point of the second wax material; depositing said heated first wax material and said second wax material onto a spinning disk to produce bichromal balls adapted for use in display applications at temperatures greater than 40° C.