Developer comprising a carrier coated with Fe.sub.3 O.sub.4 disp

Details Developer comprising a carrier coated with Fe.sub.3 O.sub.4 disp Developer comprising a carrier coated with Fe.sub.3 O.sub.4 disp

1983-09-21

1985-11-26

Goodrow, John L.

Radiation imagery chemistry: process, composition, or product th

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

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

430108, 430109, 430137, G03G 910, G03G 1100

Patent

active

045554668

ABSTRACT:
A developing material for electrostatic images comprising (a) carrier particles comprising iron beads coated with a layer of butadiene polymer resin in which Fe.sub.3 O.sub.4 powder is dispersed, the volume ratio of the polymer resin to Fe.sub.3 O.sub.4 is from 1:2 to 4:1, and the butadiene polymer is cured by heating with an organic peroxide of from 0.5 to 5.0 parts by weight, based on the weight of the butadiene polymer, which comprises a homopolymer containing 1,2-polybutadiene units, or a homopolymer or copolymer of cyclized 1,4-cis-polybutadiene and (b) from 1% to 6% by weight, based on the weight of the carrier particles, of toner particles which comprise a bis-phenol A-epichlorohydrin type resin, carbon powder, a nigrosine dye, and either a styrene-n-butyl acrylate copolymer or a montan wax.

REFERENCES:
patent: 3926628 (1975-12-01), Honjo
patent: 4374192 (1983-02-01), Mayer et al.
patent: 4414322 (1983-11-01), Miyakawa et al.

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