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COMBINED POLYMERIZATION TONER MANUFACTURING PROCESS

IP.com Disclosure Number: IPCOM000025272D
Original Publication Date: 1984-Apr-30
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a direct and economical process for the preparation of toner particles which comprises providing a polymeric solution, obtained directly from the polymerization, containing from about 15 percent by weight to 30 percent by weight of a polycarbonate composition, an example of which is diethylene glycol copolycarbonate, and from about 70 percent by weight to about 85 percent by weight of an organic solvent, such as methylene chloride and subsequently adding to the solution with mixing, from about 6 percent by weight to about 12 percent by weight of pigment particles. There can be optionally added to the mixture a charge enhancing additive, including alkyl pyridinium halides and organic sulfonates such as stearyl dimethyl phenethyl ammonium para-toluene sulfonate, in an amount of from about 0.1 percent by weight to about 10 percent by weight. Thereafter, the resulting precipitated particles in a non-solvent are separated from the mixture 'by known filtration techniques, and allowed to dry at room temperature. There results toner particles having a diameter of from about 5 microns to about 15 microns.