公开(公告)号：US09519235B2

公开(公告)日：2016-12-13

申请号：US14694451

申请日：2015-04-23

申请人： Ricoh Company, Ltd.

发明人： Shingo Sakashita ,  Shinya Nakayama ,  Masahide Yamada ,  Atsushi Yamamoto ,  Hideyuki Santo ,  Yukiko Nakajima ,  Suzuka Amemori

IPC分类号： G03G9/087 ,  C08G63/00 ,  C08G63/91 ,  C08L67/00

CPC分类号： G03G9/08764 ,  C08G63/00 ,  C08G63/91 ,  C08L67/00 ,  G03G9/08755 ,  G03G9/08768 ,  G03G9/08793 ,  G03G9/08795 ,  G03G9/08797 ,  G03G9/132

摘要： A toner including at least a crystalline resin as a binder resin, wherein a tetrahydrofuran soluble content of the toner includes 5.0% or more as a peak area of a component having a molecular weight of 100,000 or greater in a molecular weight distribution measured by gel permeation chromatography, and the tetrahydrofuran soluble content of the toner has a weight-average molecular weight of 20,000 to 60,000.

公开(公告)号：US20150234304A1

公开(公告)日：2015-08-20

申请号：US14425398

申请日：2013-09-10

申请人： RICOH COMPANY, LTD.

发明人： Kousuke Nagata ,  Masahide Yamada ,  Shinya Nakayama ,  Akiyoshi Sabu ,  Tatsuya Morita ,  Takamasa Hase ,  Suzuka Amemori ,  Rintaro Takahashi

IPC分类号： G03G9/00

CPC分类号： G03G9/08755 ,  G03G9/0819 ,  G03G9/0821 ,  G03G9/08764 ,  G03G9/08795 ,  G03G9/08797 ,  G03G15/08 ,  G03G15/2003

摘要： A toner including a crystalline resin wherein the crystalline resin contains a crystalline resin having a urethane bond, a urea bond or both thereof, and wherein the crystalline resin has an average crystallite diameter of 20 nm to 70 nm.

摘要翻译： 一种包含结晶树脂的调色剂，其中所述结晶树脂含有具有氨基甲酸酯键的结晶树脂，尿素键或其两者，并且其中所述结晶树脂的平均微晶直径为20nm至70nm。

公开(公告)号：US11372363B2

公开(公告)日：2022-06-28

申请号：US17112452

申请日：2020-12-04

申请人： RICOH COMPANY, LTD.

发明人： Daisuke Inoue ,  Shinya Nakayama ,  Yohichi Kitagawa ,  Takaaki Tawada ,  Kenji Komito

IPC分类号： G03G21/00 ,  G03G9/08 ,  G03G9/10 ,  G03G9/097

摘要： An image forming apparatus is provided. The image forming apparatus includes an image bearer and a cleaning blade configured to remove toner particles remaining on the image bearer. The cleaning blade includes an elastic member in contact with a surface of the image bearer to remove the toner particles. The elastic member has a Martens hardness of from 3 to 8 N/mm2 when measured by a nanoindentation method with a load of 1 μN. The toner particles comprise toner base particles and an external additive, and the external additive comprise silica particles. A liberation ratio (Xs) of the silica particles liberated from the toner particles is from 40% to 75% when measured by an ultrasonic vibration method. A proportion (R70) of the silica particles having a volume-based particle diameter of 70 nm or more in the silica particles liberated from the toner particles is from 70% to 90% by number.

公开(公告)号：US09720339B2

公开(公告)日：2017-08-01

申请号：US15219308

申请日：2016-07-26

申请人： Ricoh Company, Ltd.

发明人： Shingo Sakashita ,  Shinya Nakayama ,  Masahide Yamada ,  Atsushi Yamamoto ,  Hideyuki Santo ,  Yukiko Nakajima ,  Suzuka Amemori

IPC分类号： G03G9/087 ,  C08G63/00 ,  C08G63/91 ,  C08L67/00 ,  G03G9/13

CPC分类号： G03G9/08764 ,  C08G63/00 ,  C08G63/91 ,  C08L67/00 ,  G03G9/08755 ,  G03G9/08768 ,  G03G9/08793 ,  G03G9/08795 ,  G03G9/08797 ,  G03G9/132

摘要： A toner including at least a crystalline resin as a binder resin, wherein a tetrahydrofuran soluble content of the toner includes 5.0% or more as a peak area of a component having a molecular weight of 100,000 or greater in a molecular weight distribution measured by gel permeation chromatography, and the tetrahydrofuran soluble content of the toner has a weight-average molecular weight of 20,000 to 60,000.