Invention Grant
US08475989B2 Carrier, method for preparing the carrier, developer using the carrier, developer container, and image forming method and process cartridge using the developer
有权
载体,制备载体的方法,使用载体的显影剂,显影剂容器和使用显影剂的成像方法和处理盒
- Patent Title: Carrier, method for preparing the carrier, developer using the carrier, developer container, and image forming method and process cartridge using the developer
- Patent Title (中): 载体,制备载体的方法,使用载体的显影剂,显影剂容器和使用显影剂的成像方法和处理盒
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Application No.: US12897326Application Date: 2010-10-04
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Publication No.: US08475989B2Publication Date: 2013-07-02
- Inventor: Yutaka Takahashi , Minoru Masuda , Kimitoshi Yamaguchi , Hisashi Nakajima , Koichi Sakata , Hitoshi Iwatsuki , Saori Yamada , Toyoaki Tano , Mariko Takii
- Applicant: Yutaka Takahashi , Minoru Masuda , Kimitoshi Yamaguchi , Hisashi Nakajima , Koichi Sakata , Hitoshi Iwatsuki , Saori Yamada , Toyoaki Tano , Mariko Takii
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Limited
- Current Assignee: Ricoh Company, Limited
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2009-238554 20091015; JP2009-241702 20091020; JP2010-054494 20100311; JP2010-200242 20100907
- Main IPC: G03G9/00
- IPC: G03G9/00

Abstract:
The carrier is used for a two-component developer for developing an electrostatic latent image, and includes a particulate magnetic core material; and a cover layer located on a surface of the core material and including a crosslinked material and barium sulfate. The cover layer is formed by applying a coating medium including barium sulfate, a copolymer including a unit (A) having a specific acrylic siloxane structure including a tris(trialkylsiloxy)silanyl group and a unit (B) having a specific acrylic silicone structure having a crosslinking ability, and a condensation reaction catalyst, heating the applied medium to a temperature of from 100° C. to 230° C. so that the copolymer is hydrolyzed to produce a material having a silanol group, and the material and the catalyst are subjected to a condensation reaction to form the crosslinked material.
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