Adjuvants for negatively charged toners

Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...

Reexamination Certificate

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C430S115000

Reexamination Certificate

active

07144671

ABSTRACT:
Negative liquid electrographic toner compositions are provided comprising a liquid carrier having a Kauri-Butanol number less than about 30 mL and a plurality of negatively charged toner particles dispersed in the liquid carrier. The toner particles comprise a polymeric binder comprising at least one amphipathic graft copolymer comprising one or more S material portions and one or more D material portions. The toner composition additionally comprises a charge control adjuvant that is an acid or a base. These compositions have surprising bulk conductivity and charge per mass properties, particularly as the toner particles are depleted from the toner composition during printing operations.

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Commonly assigned U.S. Appl. No. 10/676,371, filed Sep. 30, 2003, enititled “Adjuvants for Positively Charged Toners” (52 pgs).
Commonly assigned U.S. Appl. No. 10/677,094, filed Sep. 30, 2003, entitled “Charge Adjuvant Delivery System and Methods” (26 pgs).
E.B. Caruthers, G.A. Gibson, J.R. Larson and I.D. Morrison, Xerox Corporation, Joseph C. Wilson Center for Technology, Webster, NY “Modeling of Liquid Toner Electrical Characteristicx,” IST&T's Tenth International Congress on Advances in Non-Impact Printing Technologies (1994), pp. 204-209.
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European Search Report dated Sep. 30, 2005, 3 pgs.

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