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POSITIVE AND NEGATIVE CHARGING FUMED METAL OXIDES IN SINGLE COMPONENT DEVELOPMENT TONER

IP.com Disclosure Number: IPCOM000027395D
Original Publication Date: 1996-Aug-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 84K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed are Single Component Development (SCD) toner compositions and processes for making and using the toner compositions in electrostatic printing and copying applications. Blending a positive and a negative charging external additive, for example, fumed metal oxide particles, such as surface treated AEROSILSB into an SCD toner at from about a 1:l weight ratio at about 0.1 to about 1.0 total weight percent provides for charge and surface additives which are evenly dispersed on a positively charging toner surface. The combination of a positive and a negative AEROSILB in a toner assists in the flow of the toner in a developer housing without reducing the charging of the toner. Typically, only negative charging AEROSILB has been used in a positively charging SCD toner which functions as both a flow enhancer and to aid in the development of the latent image. With a mixture of a positive and a negative charging AEROSILB additives, it is expected that there would be a distinct improvement in the flow of the toner and the developer housing without changing the triboelectric properties of the toner. Another advantage of using the combination of a positive and a negative external AEROSILB type additive is that the negative additive may provide the bonding force to effectively combine the positive toner and the positive external additive that may otherwise electrically repel each other. An example of a negatively charging AEROSILB additive is AEROSILB R972 available from DeGussa Corp. An example of a positively charging AEROSILB additive is Wacker H-2050 silica available from Wacker. The toner compositions may be prepared in accordance with known methodology, the application of the surface additives may be accomplished by conventional blending means, and the single component development of electrostaticgraphic images may also be achieved using known single component development hardware.

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XEROX DISCLOSURE JOURNAL

POSITIVE AND NEGATIVE CHARGING FUMED METAL OXIDES IN SINGLE COMPONENT DEVELOPMENT TONER David R. Santo
Margaret E. Tallman

Proposed Classification
U. S. C1.430/109 Int. C1. G03g 09/08

Disclosed are Single Component Development (SCD) toner compositions and processes for making and using the toner compositions in electrostatic printing and copying applications. Blending a positive and a negative charging external additive, for example, fumed metal oxide particles, such as surface treated AEROSILSB into an SCD toner at from about a 1:l weight ratio at about 0.1 to about 1.0 total weight percent provides for charge and surface additives which are evenly dispersed on a positively charging toner surface. The combination of a positive and a negative AEROSILB in a toner assists in the flow of the toner in a developer housing without reducing the charging of the toner. Typically, only negative charging AEROSILB has been used in a positively charging SCD toner which functions as both a flow enhancer and to aid in the development of the latent image. With a mixture of a positive and a negative charging AEROSILB additives, it is expected that there would be a distinct improvement in the flow of the toner and the developer housing without changing the triboelectric properties of the toner. Another advantage of using the combination of a positive and a negative external AEROSILB type additive is that the negative additive may provide the bonding force...