Acid-base property considerations for improved additive...

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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C430S108300, C430S108600, C430S137210

Reexamination Certificate

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07858281

ABSTRACT:
A developer comprised of a toner and at least one external surface additive, wherein an acid-base interaction has an Interaction Surface Parameter (ISP) of greater than 0, and wherein ISPis defined by the following equation: [(Ka)toner×(Kb)additive]+[(Kb)toner×(Ka)additive]−[(Ka)toner×(Ka)additive]−[(Kb)toner×(Kb)additive], wherein Kais the Lewis acid value and Kbis the Lewis base value.

REFERENCES:
patent: 5556727 (1996-09-01), Ciccarelli et al.
patent: 2006/0269858 (2006-11-01), McDougall et al.
patent: 2008/0171279 (2008-07-01), Veregin et al.
U.S. Appl. No. 11/624,004, filed Jan. 17, 2007 by Veregin et al.

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