Magnetic toner composition and a method of making the same

Details Magnetic toner composition and a method of making the same Magnetic toner composition and a method of making the same

1979-10-22

1981-09-01

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, 430137, 252 6254, G03G 1508

Patent

active

042872812

ABSTRACT:
Magnetic toner compositions are prepared using two types of magnetic particles. The first type of magnetic particles have hydrophilic surface characteristics and the second type of magnetic particles have hydrophobic surface characteristics. Toner compositions are prepared by a dispersion polymerization technique wherein both types of magnetic pigment are dispersed in a vinyl monomer containing a polymerization initiator. This mixture of materials forms the discontinuous phase of a dispersion polymerization, the continuous phase being water containing a suspension stabilizing agent. The toner particles thus formed have the hydrophilic magnetic particles distributed on or near the surface of the toner particles while the hydrophobic magnetic particles are uniformly distributed throughout the remainder of the toner particles.

REFERENCES:
patent: 3080318 (1963-03-01), Claus
patent: 3093039 (1963-06-01), Rheinfrank
patent: 3345294 (1967-10-01), Cooper
patent: 3796664 (1974-03-01), Hayashi
patent: 3959153 (1976-05-01), Sadamatsu et al.
patent: 4071670 (1978-01-01), Vanzo et al.
patent: 4097620 (1978-06-01), Lu

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