发明公开
- 专利标题: CARRIER CORE MATERIAL FOR ELCTROPHOTOGRAPHIC DEVELOPING AGENT, PROCESS FOR PRODUCING THE CORE MATERIAL, CARRIER FOR ELCTROPHOTOGRAPHIC DEVELOPING AGENT, AND ELECTROPHOTOGRAPHIC DEVELOPING AGENT.
- 专利标题(中): 载体芯材电发展的感光介质,METHOD FOR核材料的载体电照相显影水利电力照相显影资金的生产
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申请号: EP08738926.8申请日: 2008-03-26
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公开(公告)号: EP2133750A1公开(公告)日: 2009-12-16
- 发明人: YAMADA, Tomoya , FUJITA, Isao , AIKI, Yoshiaki
- 申请人: DOWA Electronics Materials Co., Ltd. , DOWA IP Creation Co., Ltd.
- 申请人地址: 14-1, Sotokanda 4-chome Chiyoda-ku Tokyo 101-0021 JP
- 专利权人: DOWA Electronics Materials Co., Ltd.,DOWA IP Creation Co., Ltd.
- 当前专利权人: DOWA Electronics Materials Co., Ltd.,DOWA IP Creation Co., Ltd.
- 当前专利权人地址: 14-1, Sotokanda 4-chome Chiyoda-ku Tokyo 101-0021 JP
- 代理机构: Müller-Boré & Partner Patentanwälte
- 优先权: JP2007094537 20070330
- 国际公布: WO2008120637 20081009
- 主分类号: G03G9/087
- IPC分类号: G03G9/087 ; G03G9/107 ; G03G9/113
摘要:
To provide a carrier for two-component electrophotographic developer not only having excellent fluidity but also having proper surface irregularities necessary for imparting electric charge, without generating cracks/chipping of particles even under an influence of stirring stress over a long period of time. A particle surface has raised parts of striped pattern extending almost continuously in a plurality of directions while being superposed on one another, with a surface formed with raised parts of striped pattern occupying 80% or more of the whole surface of a particle. Depths of grooves between the adjacent raised parts are 0.05µm or more and 0.2µm or less, average surface roughness Ra is 0.1µm or more and 0.3µm or less, roundness is 0.90 or more, and average particle size is 15µm or more and 100µm or less, and a carrier core material thus constituted is coated with resin. Thus, the carrier for two-component electrophotographic developer is preprared.
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