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公开(公告)号：CA1132828A
公开(公告)日：1982-10-05
申请号：CA338284
申请日：1979-10-24
Applicant: IBM
Inventor： ABBOTT JERRY J , CROSSAN STEPHEN C , FULLER STERRITT R JR , JACHIMIAK PAUL D
Abstract: ELECTROPHOTOGRAPHIC TONER AND CARRIER A developer material comprising toner particles and coated carrier beads for use in developing images in an electrostatographic device is disclosed. The toner particles are initially classified according to a size distribution wherein less than 15% by weight are greater than 16 microns, between 7 and 15% by weight are less than 5 microns, the remainder being from 5 to 16 microns; and wherein the median particle size by weight is from 8 to 12 microns. The coating of the carrier beads is a mixed resin system comprising 5 to 55% by weight polytetrafluoroethylene, 5 to 55% by weight fluoronatedpolyethylenepropylene, and 40% to 80% by weight of a poly (amide-imide) resin which is stable up to at least 600.degree.F, triboelectrically negative (with respect to the herein described toner), nonspalling, essentially nonfriable and dispersible with the other resin components. Also, preferably the coating includes a pigment, such as TiO2, dispersed in the resin system. BO9-77-065
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