Magnetic glass carrier materials

Details Magnetic glass carrier materials Magnetic glass carrier materials

1976-12-02

1978-11-07

Smith, Ronald H.

Gas separation: apparatus

Magnetic separating means

252 621P, 427 18, G03G 1309, G03G 914

Patent

active

041243854

ABSTRACT:
Electrostatographic carrier materials having low bulk densities and high magnetic permeabilities are obtained by providing an alumino-boro-silicate glass particle containing from between about 10 to about 15 molar percent Fe.sub.2 O.sub.3 in which superparamagnetic ferrite crystallites having an average particle size of up to about 500A have been precipitated by heat treatment. The magnetic behavior of the glass carrier particles which is dependent on the number present and size of the ferrite crystallites can be closely controlled by heat treatment at temperatures in the range of between about 600.degree. C and 800.degree. C. When mixed with toner particles, these magnetic glass carrier materials experience significantly reduced toner impaction levels.

REFERENCES:
patent: 2920971 (1960-01-01), Stookey
patent: 2980617 (1961-04-01), Ireland
patent: 3214379 (1965-10-01), Lindquist
patent: 3630911 (1971-12-01), Schultz
patent: 3694360 (1972-09-01), Weaver
patent: 3716630 (1973-02-01), Shirk
patent: 3947370 (1976-03-01), Miller

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