MAGNETIC TONER

摘要

A magnetic toner having magnetic toner particles containing at least a binder resin and a magnetic material, wherein; in a test in which the magnetic toner is dispersed in 5 mol/liter hydrochloric acid to dissolve the magnetic material, and where the dissolution percentage of the magnetic material with respect to the total content of the magnetic material at a point of time of 3 minutes after the magnetic toner has begun to be dispersed in the hydrochloric acid is represented by S 3 (% by mass), the dissolution percentage of the magnetic material with respect to the total content of the magnetic material at a point of time of 15 minutes after the magnetic toner has †’begun to be dispersed in the hydrochloric acid is represented by S 15 (% by mass) and the proportion S c of the dissolution level of the magnetic material at from 3 minutes to 15 minutes after the magnetic toner has begun to be dispersed in the hydrochloric acid, (V 3†’15 ), to the dissolution level of the magnetic material at from 15 minutes to 30 minutes after the magnetic toner has begun to be dispersed in the hydrochloric acid, (V 15†’30 ), is represented by S c (= V 3†’15 /V 15†’30 ), the S 3 , the S 15 and the S c satisfy the following expressions: 0.5 ‰¤ S 3 ‰¤ 10 , 40 ‰¤ S 15 ‰¤ 80 ; 1.2 ‰¤ S c ‰¤ 10 ;
and
the magnetic toner has a dielectric loss factor (tan´) at 25°C and at a frequency 1.0 × 10 4 Hz, within the range of from 2.0 × 10 -3 or more to 1.5 × 10 -2 or less.