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CONTROLLING ELECTRICAL PROPERTIES OF CARBON BLACK TONER BY INCORPORATION OF INORGANIC FILLERS

IP.com Disclosure Number: IPCOM000024180D
Original Publication Date: 1979-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 59K

Publishing Venue

Xerox Disclosure Journal

Abstract

for reducing ille bulk resistivity of pigmented toners made by melt blending with the toner materiap3a %ban black fillers of equal or higher resistivity (10 -10 ohm-cm) resin. The fillers should be microfine particles of small dimension in regard to the size of the carbon black materials, the preferred size being 0.1 to 0.2 microns or less. Additionally, such fillers should be selected so as to be relatively transparent in order to prevent the obscuring of the blackness imparted by the carbon black.

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KEROX DISCLOSURE JOURNAL

CONTROLLING ELECTRICAL PROPERTIES OF CARBON BLACK TONER BY INCORPORATION OF INORGANIC FILLERS
G. R. Dever

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Proposed Classification
U.S. Cl. 252/62.1

Int. C1. G03g 9/00

R. L. Miller
J. C. Pollet

Disclosed is a metllod from pigmented resins material and inorganic than that of the base

               for reducing ille bulk resistivity of pigmented toners made by melt blending with the toner materiap3a %ban black fillers of equal or higher resistivity (10 -10 ohm-cm) resin. The fillers should be microfine particles of small dimension in regard to the size of the carbon black materials, the preferred size being 0.1 to 0.2 microns or less. Additionally, such fillers should be selected so as to be relatively transparent in order to prevent the obscuring of the blackness imparted by the carbon black.

One of the important steps in the method is the elimination of the conductive chaining of carbon black particles which occurs through unsatisfactory dispersion, this conductive chaining being effectively broken up, with the conductive materials being insulated from one another by the resistive filler materials. Accordingly, in the method there can be employed filled resin compositions of somewhat low resistivity, such as crystalline polyesters, which materials have other advantages including toughness and ability to fuse at lower energy in an electrophotographic environment.

Volume 4 Number 6 November/December 1979 73 I

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