Toner for developing electrostatic images

Details Toner for developing electrostatic images Toner for developing electrostatic images

1996-11-15

1998-06-30

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, G03G 9087

Patent

active

057731837

ABSTRACT:
A toner for developing an electrostatic image has a binder resin, a colorant and a charge control agent. The binder resin has a polyester resin having an acid value of from 15 to 40 and a hydroxyl value of 45 or less. The toner has, in its molecular weight distribution as measured by gel permeation chromatography, tetrahydrofuran-soluble matter having a weight average molecular weight Mw of 100,000 or more, having a ratio of weight average molecular weight Mw to number average molecular weight Mn, Mw/Mn, of not less than 35, containing from 70% to 94% of a low-molecular weight region component having a molecular weight of less than 150,000, containing from 1% to 10% of a medium-molecular weight region component having a molecular weight of from 150,000 to 500,000, and containing from 5% to 25% of a high-molecular weight region component having a molecular weight of more than 500,000. The high-molecular weight region component is more than the medium-molecular weight region component.

REFERENCES:
patent: 2297691 (1942-10-01), Carlson
patent: 5468585 (1995-11-01), Matsumoto et al.
patent: 5483327 (1996-01-01), Taya et al.
patent: 5489498 (1996-02-01), Ohno et al.
patent: 5578409 (1996-11-01), Kotaki et al.
Patent Abstracts of Japan, vol. 15, No. 449 (P-1275), Nov. 1991 of JP 3-118468.

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