Dry developer composition comprising polymer binder resin and co

Details Dry developer composition comprising polymer binder resin and co Dry developer composition comprising polymer binder resin and co

1983-12-30

1989-07-04

Shah, Mukund J.

Radiation imagery chemistry: process, composition, or product th

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

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

430109, 430110, G03G 900, G03G 908

Patent

active

048450057

ABSTRACT:
A dry developer composition for electrophotography is disclosed capable of retaining a positive charge and comprises a binder resin and a colorant, the binder resin being a polymer obtained by polymerizing, in a suspension, (A) 98 to 99.95 parts by weight of a hydrophobic copolymerizable monomer and (B) 0.05 to 2.0 parts by weight of a tertiary amino group-containing copolymerizable monomer having the formula (1): ##STR1## in which R1 is hydrogen or methyl, X is --COO-- or --CONH--, R2 and R3 are each an alkyl having 1 to 4 carbon atoms or an aryl and n is an integer of 1 to 4, in the presence of (C) 0.5 to 5.0 parts by weight of an azonitrile polymerization initiator.

REFERENCES:
patent: 2892794 (1959-06-01), Insalaco
patent: 3933665 (1976-01-01), Van Engeland et al.
patent: 3941898 (1976-02-01), Sadamatsu et al.
patent: 3959153 (1976-05-01), Sadamatsu et al.
patent: 3980576 (1976-09-01), Vijayendran
patent: 4314931 (1982-02-01), Hoffend et al.
patent: 4386147 (1983-05-01), Seimiya et al.

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