Magnetic toner for developing electrostatic images

Details Magnetic toner for developing electrostatic images Magnetic toner for developing electrostatic images

1989-10-12

1990-07-03

Welsh, J. David

Radiation imagery chemistry: process, composition, or product th

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

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

430903, 430109, 430111, 526934, 525934, 524904, 524901, G03G 914

Patent

active

049390600

ABSTRACT:
A magnetic toner for developing electrostatic images, comprising at least a binder resin and a magnetic powder; the binder resin having 10 to 70 wt. % of a THF (tetrahydrofuran)-insoluble and a THF-soluble, the THF-soluble providing a molecular weight distribution in the chromatogram of GPC (gel permeation chromatography) thereof such that it provides a rate (Mw/Mn) of weight-average molecular weight (Mw)
umber-average molecular weight (Mn).gtoreq.5, there are a peak in the molecular weight range of 2,000 to 10,000 and a peak or shoulder in the molecular weight range of 15,000 to 100,000 and a component having a molecular weight of 10,000 or smaller is contained in an amount of 10-50 wt. % based on the binder resin; the magnetic powder comprising spherical magnetic particles having a bulk density of 0.6 g/ml or larger.

REFERENCES:
patent: 4401741 (1983-08-01), Miyakawa
patent: 4702986 (1987-10-01), Imai et al.
patent: 4824752 (1989-04-01), Yasuda et al.

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