Browse Prior Art Database

CHARGE CONTROL IN ELECTRO-PHORETIC DISPLAY SUSPENSIONS

IP.com Disclosure Number: IPCOM000024105D
Original Publication Date: 1979-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 135K

Publishing Venue

Xerox Disclosure Journal

Abstract

The control of the electrical charge on particles such as titanium dioxide employed in electrophoretic devices is achieved by the addition of small amounts of an anionic charge control agent. A particularly effective charge control agent is

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XEROX DISCLOSURE JOURNAL

CHARGE CONTROL IN ELECTRO~ Proposed Classification PHORETIC DISPLAY SUSPENSIONS U.S. Cl. 96/1
~3ohnR. Harbour mt. Cl. G03g
Michael A. Hopper
Vlad J. Novotny

The control of the electrical charge on particles such as titanium dioxide employed in electrophoretic devices is achieved by the addition of small amounts of an anionic charge control agent. A particularly effective charge control agent is

sodium di~2~ethylhexylsulfosuccinate. It is believed that the sodium ion can be replaced by divalent ions, such 95 Ba~ or Ca~ or trivalent ions, such as
The addition of about 1.3 x 1O~ moles of the charge control agent per gram of

titanium dioxide in suspension provides highly improved mobility to the particles.

Volume 4 Number 5 September/October 1979 553

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