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Browse Prior Art Database

TONER OF IMPROVED MECHANICAL PROPERTIES

IP.com Disclosure Number: IPCOM000024131D
Original Publication Date: 1979-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 186K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a process for the preparation of electrostatographic toner particles having improved mechanical properties, controlled particle size, and appropriate size distribution by accomplishing molecular orientation of glassy, brittle, semi-cyrstalline, low-molecuIarweight polymers. The molecular orientation of these polymers, which is caused by the extrusion of polymer fibers or films, results in more flexible polymers, increases their yield stress, and their mechanical fatigue. In a specific embodiment, the process involves forming a blend of the polymeric

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XEROX DISCLOSURE JOURNAL

TONER OF IMPROVED MECHANICAL Proposed Classification PROPERTIES U.S. CI. 252/62,1

Charles L. Beatty mt. CI. G03g 9/00 ~ean~Claude Pollet

Disclosed is a process for the preparation of electrostatographic toner particles having improved mechanical properties, controlled particle size, and appropriate

size distribution by accomplishing molecular orientation of glassy, brittle, semi~ cyrstalline, low~molecuIarweight polymers. The molecular orientation of these polymers, which is caused by the extrusion of polymer fibers or films, results in more flexible polymers, increases their yield stress, and their mechanical fatigue. In a specific embodiment, the process involves forming a blend of the polymeric

material and a coloring agent with or without other additives. The blend is fed in liquid form or as a flowable extrudate (with or without agitation) and brought to the desired operating temperature (typically above the initial melting temperature of the polymer) and then extruded and drawn to obtain the desired molecular orientation, shape, particle size and size distribution.

Any suitable polymer material can be used although low~molecularweight polymers are preferred in some instances as less energy is required for fusing in such situations. Examples of some polymer materials include natural resins, thermoplastic resins or partially cured thermosetting resins.

Volume 4 Number 5 September/October 1979 625

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