发明授权
- 专利标题: Magnetic developer for developing electrostatic images
- 专利标题(中): 磁性显影剂用于静电图像显影
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申请号: US135974申请日: 1993-10-14
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公开(公告)号: US5364720A公开(公告)日: 1994-11-15
- 发明人: Akihiko Nakazawa , Masayoshi Kato , Manabu Ohno , Nobuyuki Okubo , Shunji Suzuki
- 申请人: Akihiko Nakazawa , Masayoshi Kato , Manabu Ohno , Nobuyuki Okubo , Shunji Suzuki
- 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: JPX4-277234 19921015; JPX5-026011 19930122; JPX5-013560 19930129
- 主分类号: G03G9/083
- IPC分类号: G03G9/083 ; G03G9/087
摘要:
A magnetic developer for developing electrostatic images is constituted by magnetic toner particles, each containing a binder resin having a melt viscosity of at most 5.0.times.10.sup.6 poise at 150.degree. C. and a magnetic material. The magnetic material is blended with a proportion (C) [wt. %] of inorganic fine particles based on the magnetic material to carry 0.2-5 wt. % of the inorganic fine particles secured to the magnetic material surface. The magnetic material has a specific surface area (A) [m.sup.2 /g] before securing of the inorganic fine particles and is provided with an increase in surface area (B) [m.sup.2 /g] by the securing of the inorganic fine particles; wherein the parameters A, B and C satisfy the following formulae (1) and (2):0.1.ltoreq.B/A.ltoreq.0.8 (1)B