Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1982-07-15
1984-02-28
Welsh, John D.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430109, 430111, 525179, 525184, G03G 910
Patent
active
044342209
ABSTRACT:
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 carrier beads have a core with a coating thereon. The coating is a mixed resin system comprising 5 to 55% by weight polytetrafluoroethylene, 5 to 55% by weight fluorinated polyethylene-propylene, 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 TiO.sub.2, dispersed in the resin system.
More specific ranges of size classification of the toner particles and preferred ranges of resin components are also disclosed.
REFERENCES:
patent: 3533835 (1970-10-01), Hagenbach
patent: 3938992 (1976-02-01), Jadwin et al.
patent: 4125667 (1978-11-01), Jones
Abbott Jerry J.
Crossan Stephen C.
Fuller, Jr. Sterritt R.
Jachimiak Paul D.
International Business Machines - Corporation
Sirr Francis A.
Welsh John D.
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