发明名称 |
Positively chargeable magnetic toner, image forming process image forming apparatus, apparatus unit and facsimile apparatus |
摘要 |
A positively chargeable magnetic toner comprises positively chargeable magnetic toner particles having at least a binder resin, a magnetic substance and a charge controlling agent; wherein the binder resin contains (A) a vinyl polymer having carboxyl groups, acid anhydride groups, partial esters thereof or mixtures of the groups and having and an acid value of 5 to 30, and (B) a copolymer obtained by polymerizing at least a diolefin monomer and a vinyl monomer; and wherein the charge controlling agent contains (C) a quaternary ammonium salt and (D) a nigrosine dye or a triphenylmethane dye, the ratio by weight among the components (A), (B), (C) and (D) being within the range of (A):(B):(C):(D)=80 to 30:70 to 20:2.0 to 0.5: 2.0 to 0.1 relative to 100 parts of the total weight of the components (A) and (B). The present invention also provides an image forming process, an image forming apparatus and a facsimile apparatus, all of which use the positively chargeable magnetic toner.
|
申请公布号 |
US5213933(A) |
申请公布日期 |
1993.05.25 |
申请号 |
US19910706184 |
申请日期 |
1991.05.28 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
OSAKI, ICHIROU;NOZAWA, KEITA;KOBAYASHI, KUNIKO;FUJIWARA, MASATSUGU;SHIMAMURA, MASAYOSHI |
分类号 |
G03G9/087;G03G9/09;G03G9/097 |
主分类号 |
G03G9/087 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|