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Monocomponent Toner System

IP.com Disclosure Number: IPCOM000052307D
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Burger, LC: AUTHOR [+3]

Abstract

Particulate monocomponent toner is subjected to a temperature decrease at the copier's development station in order to render the toner conductive and to thereby effect inductive charging of the toner by virtue of the photoconductor's electrostatic latent image.

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Monocomponent Toner System

Particulate monocomponent toner is subjected to a temperature decrease at the copier's development station in order to render the toner conductive and to thereby effect inductive charging of the toner by virtue of the photoconductor's electrostatic latent image.

The monocomponent toner particles include carbon black and a fusible polymer matrix, the combined resistivity of which is temperature dependent, i.e., it undergoes a sharp transition from conductive to nonconductive upon being subjected to an increase in temperature of from 30 degrees to 40 degr The journal of Applied Physics, Vol. 44, No. 1, Jan. 1973, beginning at page 532, describes this conductivity switching phenomenon.

As this type of monocomponent toner is transported to the development nip of a xerographic reproduction device, the toner enters an area of lower temperature and becomes conductive. As a result, the toner inductively charges to a polarity opposite the polarity of the photo conductor's latent image, and the photoconductor's image is toned.

At the device's transfer station, the now-charged toner experiences a return to warmer temperature and is once again nonconductive, and transfer of the toner to plain paper occurs by conventional corona transfer.

In an alternate embodiment, the conductivity switching phenomenon described in the journal of Polymer Science, Vol. 17, 1979, beginning at page 2163, could be used. In this case, the loading and type of carbon blac...