Negatively chargeable toner for use in dry electrophotography

Details Negatively chargeable toner for use in dry electrophotography Negatively chargeable toner for use in dry electrophotography

1988-01-25

1989-11-28

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...

430110, G03G 900, G03G 1320

Patent

active

048837350

ABSTRACT:
A negatively chargeable toner for use in dry electrophotography, said toner comprising (A) a resinous binder composed of at least one resin selected from copolymers of styrene and/or alpha-methylstyrene with alkyl (meth)acrylates, (B) 2 to 10 parts by weight, per 100 parts by weight of the resinous binder, of a copolymer containing a sulfonic acid group, said copolymer having a weight average molecular weight of from 2,000 to 15,000 and composed of 80 to 98% by weight of recurring units represented by the formula ##STR1## wherein R.sub.1 represents a hydrogen atom or a methyl group, and 20 to 2% by weight of recurring units represented by the formula ##STR2## and (C) a coloring agent.

REFERENCES:
patent: 4415646 (1983-11-01), Gruber et al.
patent: 4656111 (1987-04-01), Wakamiya et al.

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