Electrostatic image developer

Details Electrostatic image developer Electrostatic image developer

1994-03-24

1996-01-09

Goodrow, John

Radiation imagery chemistry: process, composition, or product th

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

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

G03G 9113

Patent

active

054828082

ABSTRACT:
Disclosed is an electrostatic image developer with negative chargeability which can give clear image quality and high image density by virtue of the toner, contained therein, having a small-diameter or a high content of fine toner particle, surface-modified with a fluoropolymer fine particle. The toner primarily consists of a polyester binder resin and a coloring pigment, and the toner has an average particle size of 9 .mu.m or less, or a .ltoreq.4 .mu.m fine toner particle content of at least 0.1% by weight. The toner is surface-modified with 0.1 to 10% by weight of a fluoropolymer fine particle having an average particle size smaller than that of the toner, in such a way that the ratio of the surface area of the fluoropolymer fine particle to that of the toner may be 10.sup.-3 to 10.sup.-1. Use of a polytetrafluoroethylene fine particle is preferred among other fluoropolymers, and a combination of the surface modification with the fluoropolymer fine particle and that with an inorganic fine particle is further preferred.

REFERENCES:
patent: 5118588 (1992-06-01), Nair et al.
patent: 5253021 (1993-10-01), Aslarn et al.

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