Toner for a two-component-type magnetic developing agent having excellent spent reistance

摘要

A negatively-charged toner for a two-component-type magnetic developing agent comprising a resin fixing medium, which is a copolymer resin having aromatic polar groups of a composition of a resin having anionic polar groups, and a magnetic powder in an amount of from 0.1 to 5 parts by weight per 100 parts by weight of the resin fixing medium, the toner being such that a methanol extract of the toner exhibits zero absorbency over wavelengths of from 400 to 700 nm and from 280 to 350 nm.