| 摘要 |
<p>PURPOSE:To provide a magnetic toner excellent in environmental stability and dot reproducing property, fixing property and offset resistance and capable of forming toner image having high image density even in the case of preservation for a long time. CONSTITUTION:The magnetic toner has <=13.5mum weight average particle size and <=50wt.% particles of >=12.7mum particle size. The magnetic toner contains such iron oxide containing 0.5-4wt.% silicon element based on the iron element. The amt. (B) of silicon element present to 20wt.% of iron element dissolution of magnetic iron oxide and the amt. (A) of silicon element in the magnetic iron oxide satisfy B/AX100=44-84%, and amt. (C) of silicon element on the surface of iron oxide satisfies C/AX100=10-55%.</p> |
