发明授权
US08592118B2 Toner, developer, image forming apparatus, and image forming method
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调色剂,显影剂,成像设备和图像形成方法
- 专利标题: Toner, developer, image forming apparatus, and image forming method
- 专利标题(中): 调色剂,显影剂,成像设备和图像形成方法
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申请号: US13456659申请日: 2012-04-26
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公开(公告)号: US08592118B2公开(公告)日: 2013-11-26
- 发明人: Shingo Sakashita , Kazumi Suzuki , Tatsuya Morita
- 申请人: Shingo Sakashita , Kazumi Suzuki , Tatsuya Morita
- 申请人地址: JP Tokyo
- 专利权人: Ricoh Company, Ltd.
- 当前专利权人: Ricoh Company, Ltd.
- 当前专利权人地址: JP Tokyo
- 代理机构: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- 优先权: JP2011-106418 20110511
- 主分类号: G03G9/087
- IPC分类号: G03G9/087
摘要:
In accordance with some embodiments, a toner including a first binder resin, a release agent, a release agent dispersing resin, and a colorant is provided. The first binder resin includes an amorphous polyester resin (a) having a polyhydroxycarboxylic acid skeleton in its main chain. The polyhydroxycarboxylic acid skeleton comprises optically-active monomers having an optical purity X of 80% by mole or less. The optical purity X is represented by the following formula: X(% by mole)=|X(L-form)−X(D-form)| wherein X(L-form) and X(D-form) represent ratios (% by mole) of L-form and D-form optically-active monomers, respectively. The release agent includes an ester of a fatty acid having an average carbon number of 18 to 24 with glycerin or a polyglycerin having an average polymerization degree of 2 to 10. The ester has a melting point of 55 to 80° C.
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