发明授权
US5558967A Toner for developing electrostatic image and two-component type
developer for developing electrostatic image
失效
用于显影静电图像的调色剂和用于显影静电图像的双组分型显影剂
- 专利标题: Toner for developing electrostatic image and two-component type developer for developing electrostatic image
- 专利标题(中): 用于显影静电图像的调色剂和用于显影静电图像的双组分型显影剂
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申请号: US332474申请日: 1994-10-31
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公开(公告)号: US5558967A公开(公告)日: 1996-09-24
- 发明人: Takayuki Nagatsuka , Takashige Kasuya , Tatsuya Nakamura , Makoto Kanbayashi , Tatsuhiko Chiba
- 申请人: Takayuki Nagatsuka , Takashige Kasuya , Tatsuya Nakamura , Makoto Kanbayashi , Tatsuhiko Chiba
- 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: JPX3-268202 19910919; JPX4-231975 19920831
- 主分类号: G03G9/08
- IPC分类号: G03G9/08 ; G03G9/087 ; G03G9/113
摘要:
A toner and a two-component developer for developing electrostatic images are disclosed. The toner comprises toner particles and the two-component developer comprises the toner and a carrier. The toner particle has a two-layer structure of a core layer and a surface layer, produced by suspension polymerization. The core layer and surface layer are mainly comprised of a resin having a low softening point and a resin having a high softening point, respectively. In the surface layer, a polyester resin having a specific acid value and a specific molecular weight is included to impart an appropriate water absorption to the toner. Due to the appropriate water absorption and superior fluidity, the toner can achieve a speedy rise of charge to give electrostatic charges in a stable quantity over a long period of time, and it can give a high image density and images with superior fine-line reproduction and highlight reproduction.
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