发明授权
US5212524A Toner for developing electrostatic images, image forming method and
image forming apparatus
失效
用于静电图像显影的调色剂,成像方法和图像形成装置
- 专利标题: Toner for developing electrostatic images, image forming method and image forming apparatus
- 专利标题(中): 用于静电图像显影的调色剂,成像方法和图像形成装置
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申请号: US937114申请日: 1992-08-31
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公开(公告)号: US5212524A公开(公告)日: 1993-05-18
- 发明人: Hirohide Tanikawa , Yasutaka Akashi , Masaki Uchiyama , Makoto Unno , Masaaki Taya
- 申请人: Hirohide Tanikawa , Yasutaka Akashi , Masaki Uchiyama , Makoto Unno , Masaaki Taya
- 申请人地址: JPX Tokyo
- 专利权人: Canon Kabushiki Kaisha
- 当前专利权人: Canon Kabushiki Kaisha
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX1-289882 19891109; JPX2-051196 19900302
- 主分类号: G03G9/08
- IPC分类号: G03G9/08 ; G03G9/083 ; G03G9/087
摘要:
A toner for developing electrostatic images, comprises a binder resin and a colorant, wherein the binder resin comprises a vinyl copolymer having an acid anhydride group, and the binder resin has a total acid value (A) of 2-100 mgKOH/g and a total acid value (B) attributable to acid anhydride group of below 6 mgKOH/g so that [(B)/(A)].times.100 is 60% or less. Because the binder resin has a specified acid value partly attributable to acid anhydride group, the toner is provided with an adequate balance between chargeability and dischargeability, so that the toner shows a stable performance under various environmental conditions. The toner is particularly advantageously constituted as a magnetic toner of fine particle sizes suitably used under application of unsymmetrical alternating bias electric field.