Browse Prior Art Database

ENCAPSULATED TONER COMPOSITIONS WITH MICROWAVE ABSORPTIVE SHELLS

IP.com Disclosure Number: IPCOM000025798D
Original Publication Date: 1988-Feb-29
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 99K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a toner composition suitable for the development of images in electrophotographic processes employing microwave fusing for effecting the fixing of images generated by these processes. The encapsulated liquid toner composition selected comprises a non-conductive and non-polarized liquid encapsulated in a highly microwave absorptive shell. The shell materials may be selected from any known encapsulating toner shell materials, modified by an additive comprising a conductive OF polarized material, such as a conductive plastic, a ferrite, or any other suitable conductive material. Preferably the encapsulation shell material is of a "quick thermal release" type, with a sharp, relatively low melting point.

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ENCAPSULATED TONER COM- POSITIONS WITH MICROWAVE ABSORPTIVE SHELLS
Paul F. Morgan

Proposed Classification
U.S. C1.430/105 Int. C1. G03g 9/00

Disclosed is a toner composition suitable for the development of images in electrophotographic processes employing microwave fusing for effecting the fixing of images generated by these processes. The encapsulated liquid toner composition selected comprises a non-conductive and non-polarized liquid encapsulated in a highly microwave absorptive shell. The shell materials may be selected from any known encapsulating toner shell materials, modified by an additive comprising a conductive OF polarized material, such as a conductive plastic, a ferrite, or any other suitable conductive material. Preferably the encapsulation shell material is of a "quick thermal release" type, with a sharp, relatively low melting point.

During a microwave fusing process with this toner composition, the microwave energy, which is highly selective as to its thermal energy release, is highly concentrated in the conductive material in the toner shell to melt the shells rapidly and release the liquid toner. By concentrating most of the microwave energy absorption in only a small percentage of the total toner and paper mass, fusing is accomplished more rapidly and evenly, and with much less micowave energy. Also, the toner is released for fusing in all areas with less energy density; in addition, the released toner is a free flowing, paper penetrating, liquid which, unlike dry toners, does not have a temperature dependent flow rate associated with the partially melted polymer in a dry toner. Thus, the disclosed composition and process overcome known problems with microwave fusing such as ener...