Invention Grant
- Patent Title: Carrier core material for electrophotographic developer and method for producing the same, carrier for electrophotographic developer, and electrophotographic developer
- Patent Title (中): 用于电子照相显影剂的载体芯材料及其制备方法,电子照相显影剂载体和电子照相显影剂
-
Application No.: US12450090Application Date: 2008-03-26
-
Publication No.: US08343453B2Publication Date: 2013-01-01
- Inventor: Tomoya Yamada , Isao Fujita , Yoshiaki Aiki
- Applicant: Tomoya Yamada , Isao Fujita , Yoshiaki Aiki
- Applicant Address: JP Tokyo JP Okayama
- Assignee: Dowa Electronics Materials Co., Ltd.,Dowa IP Creation Co., Ltd.
- Current Assignee: Dowa Electronics Materials Co., Ltd.,Dowa IP Creation Co., Ltd.
- Current Assignee Address: JP Tokyo JP Okayama
- Agency: Oliff & Berridge, PLC
- Priority: JP2007-094537 20070330
- International Application: PCT/JP2008/055738 WO 20080326
- International Announcement: WO2008/120637 WO 20081009
- Main IPC: C01G49/06
- IPC: C01G49/06 ; G03G9/107

Abstract:
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 0.05 μm or more and 0.2 μm or less, average surface roughness Ra is 0.1 μm or more and 0.3 μm or less, roundness is 0.90 or more, and average particle size is 15 μm or more and 100 μm or less, and a carrier core material thus constituted is coated with resin. Thus, the carrier for two-component electrophotographic developer is prepared.
Public/Granted literature
Information query
IPC分类: