Positively chargeable magnetic toner, image forming process imag

Details Positively chargeable magnetic toner, image forming process imag Positively chargeable magnetic toner, image forming process imag

1991-05-28

1993-05-25

Goodrow, John

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Post imaging process, finishing, or perfecting composition...

430110, 355251, 358301, G03G 9083

Patent

active

052139336

ABSTRACT:
A positively chargeable magnetic toner comprises positively chargeable magnetic toner particles having at least a binder resin, a magnetic substance and a charge controlling agent; wherein the binder resin contains (A) a vinyl polymer having carboxyl groups, acid anhydride groups, partial esters thereof or mixtures of the groups and having and an acid value of 5 to 30, and (B) a copolymer obtained by polymerizing at least a diolefin monomer and a vinyl monomer; and wherein the charge controlling agent contains (C) a quaternary ammonium salt and (D) a nigrosine dye or a triphenylmethane dye, the ratio by weight among the components (A), (B), (C) and (D) being within the range of (A):(B):(C):(D)=80 to 30:70 to 20:2.0 to 0.5: 2.0 to 0.1 relative to 100 parts of the total weight of the components (A) and (B). The present invention also provides an image forming process, an image forming apparatus and a facsimile apparatus, all of which use the positively chargeable magnetic toner.

REFERENCES:
patent: 4535048 (1985-08-01), Inoue et al.
patent: 4554233 (1985-11-01), Hashimoto et al.
patent: 4737432 (1988-04-01), Tanaka et al.

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