Bichromal balls
AssigneeXerox Corporation
InventorsSan-Ming Yang, Thomas Enright, Aurelian Magdalinis, Ahmed Alzamly, Man-Chung Tam, Carol Jennings, Peter Kazmaier, Marko Saban, Michael Hawkins
Life of this patent
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Abstract
Disclosed is a technique for producing bichromal balls that are adapted for use in high temperature applications. The bichromal balls find particular application in signs and display devices that can be used in environments in which the temperature exceeds 40° C.
Claims23
A process for forming bichromal balls adapted for use in high temperature applications, said process comprising:
- providing a polyalkylene wax;
- providing an organic solvent;
- extracting said polyalkylene wax with said organic solvent at an elevated temperature of from about 600° C. to about 1000° C. to yield a purified polyalkylene wax;
- and
- forming said bichromal balls from said purified polyalkylene wax, to thereby produce said bichromal balls adapted for use in high temperature applications.
A process for forming bichromal balls adapted for display applications at temperatures greater then 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.
A process for forming bichromal balls adapted for use in displays at temperatures greater than 40° C., said process comprising:
- providing a blend of polyalkylene waxes having a molecular weight of from about 200 to about 3,000;
- adding an isoparaffin solvent to the polyalkylene waxes to form a mixture;
- heating the mixture to a temperature greater than about 80° C.;
- filtering the heated mixture and removing the filtrate from the waxy solid having a molecular weight of from about 700 to about 3,000;
- and
- forming said bichromal balls from said waxy solid, to thereby produce said bichromal balls adapted for use in high temperature applications.
Dependencies are inferred from the claim text.