Invention Grant
US08409778B2 Resin coated carrier, two-component developer, developing device and image forming apparatus
有权
树脂涂层载体,双组分显影剂,显影装置和成像装置
- Patent Title: Resin coated carrier, two-component developer, developing device and image forming apparatus
- Patent Title (中): 树脂涂层载体,双组分显影剂,显影装置和成像装置
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Application No.: US12691430Application Date: 2010-01-21
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Publication No.: US08409778B2Publication Date: 2013-04-02
- Inventor: Osamu Wada , Tadashi Iwamatsu , Takanori Kamoto , Nobuyuki Yoshioka , Natsuki Matsuura , Nobuhiro Seki , Masatomo Hayashi
- Applicant: Osamu Wada , Tadashi Iwamatsu , Takanori Kamoto , Nobuyuki Yoshioka , Natsuki Matsuura , Nobuhiro Seki , Masatomo Hayashi
- Applicant Address: JP Osaka JP Tokyo
- Assignee: Sharp Kabushiki Kaisha,Kanto Denka Kogyo Co., Ltd.
- Current Assignee: Sharp Kabushiki Kaisha,Kanto Denka Kogyo Co., Ltd.
- Current Assignee Address: JP Osaka JP Tokyo
- Agency: Nixon & Vanderhye P.C.
- Priority: JPP2009-011421 20090121
- Main IPC: G03G15/08
- IPC: G03G15/08

Abstract:
A resin coated carrier is provided that can stably charge a toner having added thereto an external additive having a large particle size over a long period of time and can prevent blocking of a developer. The resin coated carrier satisfies the following formula (1): log(Mb/Ma)>2 (1) in which Ma is a weight average molecular weight of a silicone resin having the minimum weight average molecular weight, contained in a resin coating layer, and Mb is a weight average molecular weight of a silicone resin having the maximum weight average molecular weight, and the following formula (2) is satisfied: 0.5≦−log(A/B)≦2.5 (2) in which A is a volume resistance (Ω/cm) under electric field of 1,000 V/cm obtained by conducting a stirring test, and B is a volume resistance (Ω/cm) under electric field of 1,000 V/cm before the stirring test.
Public/Granted literature
- US20100183340A1 RESIN COATED CARRIER, TWO-COMPONENT DEVELOPER, DEVELOPING DEVICE AND IMAGE FORMING APPARATUS Public/Granted day:2010-07-22
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