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公开(公告)号:US20170185000A1
公开(公告)日:2017-06-29
申请号:US15392482
申请日:2016-12-28
申请人: Masashi NAGAYAMA , Mariko TAKll , Yoshihiro MURASAWA , Haruki MURATA , Kei NIWAYAMA , Tohru SUGANUMA , Koichi SAKATA , Saori YAMADA , Shinya NAKAGAWA , Kohsuke MIYAZAKI
发明人: Masashi NAGAYAMA , Mariko TAKll , Yoshihiro MURASAWA , Haruki MURATA , Kei NIWAYAMA , Tohru SUGANUMA , Koichi SAKATA , Saori YAMADA , Shinya NAKAGAWA , Kohsuke MIYAZAKI
IPC分类号: G03G9/00
CPC分类号: G03G9/1139 , G03G9/0821 , G03G9/1131 , G03G15/0121 , G03G15/0865 , G03G2215/0129 , G03G2215/0132
摘要: Carrier for image forming includes a core material particle including a magnetic material and a coating layer disposed on the surface of the core material particle, the coating layer including a resin, carbon black, an inorganic particulate A, and an inorganic particulate B. The carbon black has a concentration gradient along a thickness direction of the coating layer with a concentration from high to low toward a surface of the coating layer while the inorganic particulate A has a concentration gradient along a thickness direction of the coating layer with a concentration from low to high toward the surface of the coating layer. The volume ratio of the carbon black is 0-30 percent at a depth range of 0.0-0.1 μm from the surface of the coating layer. The inorganic particulate A is electroconductive with a powder specific resistance of 200 Ω·cm or less.
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2.
公开(公告)号:US20180267421A1
公开(公告)日:2018-09-20
申请号:US15911443
申请日:2018-03-05
申请人: Mariko TAKII , Koichi SAKATA , Tohru SUGANUMA , Masahiro SEKI , Masashi NAGAYAMA , Toyoaki TANO , Kohsuke MIYAZAKI
发明人: Mariko TAKII , Koichi SAKATA , Tohru SUGANUMA , Masahiro SEKI , Masashi NAGAYAMA , Toyoaki TANO , Kohsuke MIYAZAKI
CPC分类号: G03G9/1075 , G03G9/1131 , G03G9/1133 , G03G9/1134 , G03G9/1135 , G03G9/1136 , G03G9/1139 , G03G15/08 , G03G15/0853 , G03G15/556
摘要: A carrier is provided including a core particle and a resin layer coating the surface of the core particle. The resin layer includes fine metal particles, and a detected metal element amount A obtained by X-ray photoelectron spectrometry of the surface of the carrier is in a range of 4.0 atomic %≤A≤20.0 atomic % and an average major-axis length B of the fine metal particle exposing from the resin layer is in a range of 100 nm≤B≤800 nm.
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