초록 ▼

A magnetic toner is formed from a binder resin and silicon-containing magnetic iron oxide particles. The magnetic toner has a weight-average particle size of at most 13.5 mm

A magnetic toner is formed from a binder resin and silicon-containing magnetic iron oxide particles. The magnetic toner has a weight-average particle size of at most 13.5 mm

대표청구항 ▼

A magnetic toner comprising magnetic toner particles containing a binder resin and magnetic iron oxide particles; wherein the magnetic toner has a weight-average particle size of at most 13.5 m12.7 m50 wt. %; the magnetic iron oxide particles have a silicon content of 0.4-2.0 wt. % based on iron; th

A magnetic toner comprising magnetic toner particles containing a binder resin and magnetic iron oxide particles; wherein the magnetic toner has a weight-average particle size of at most 13.5 m12.7 m50 wt. %; the magnetic iron oxide particles have a silicon content of 0.4-2.0 wt. % based on iron; the magnetic iron oxide particles have an Fe/Si atomic ratio of 1.2-2.8 at the utmost surfaces thereof; the magnetic iron oxide particles have a smoothness of 0.45-0.7; and the magnetic iron oxide particles have an aluminum content from 0 to 0.8 wt. % based on iron. The magnetic toner according to claim 1, wherein the magnetic iron oxide particles further contain a negative charge control agent. The magnetic toner according to claim 20, wherein the magnetic charge control agent is a monoazo iron complex salt represented by the following formula: [Figure] wherein X1 and X2 independently are hydrogen, lower alkyl, lower alkoxy, nitro or halogen; m and m′independently are an integer of 1-3; Y1 and Y3 independently denote hydrogen, C1-C18 alkyl, C2-C18 alkenyl, sulfonamide, mesyl, sulfonic acid, carboxy ester, hydroxy, C1-C18 alkoxy, C2-C18 acetylamino, benzoyl, amino or halogen; n and n′independently are an integer of 1-3; Y2 and Y4 independently are hydrogen or nitro; A�denotes H+, Na+, K+or NH4+.