公开(公告)号：US20220057725A1

公开(公告)日：2022-02-24

申请号：US17403409

申请日：2021-08-16

Applicant: Daisuke INOUE ,  Mitsuaki Hirose ,  Yohichi Kitagawa ,  Masayuki Ukigaya ,  Kenji Komito ,  Hiroshi Yamada

Inventor： Daisuke INOUE ,  Mitsuaki Hirose ,  Yohichi Kitagawa ,  Masayuki Ukigaya ,  Kenji Komito ,  Hiroshi Yamada

IPC: G03G9/08 ,  G03G9/093 ,  G03G9/087 ,  G03G9/09 ,  G03G15/08 ,  G03G21/18

Abstract: A toner is provided. The toner comprises toner base particles, resin particles adhered to surfaces of the toner base particles, and an external additive adhered to the surfaces of the toner base particles. The toner base particles each comprising a binder resin, a colorant, and a wax. The toner has a storage elastic modulus G′ of 4.0×105 or less at 70° C. An embedment degree of the external additive is from 15% to 40%, as the embedment degree is measured by stirring 10 g of the toner and 20 g of a carrier in a 50-mL vial at 67 Hz for 60 minutes using a rocking mill.

公开(公告)号：US20210173337A1

公开(公告)日：2021-06-10

申请号：US17112452

申请日：2020-12-04

Applicant: Daisuke INOUE ,  Shinya NAKAYAMA ,  Yohichi KITAGAWA ,  Takaaki TAWADA ,  Kenji KOMITO

Inventor： Daisuke INOUE ,  Shinya NAKAYAMA ,  Yohichi KITAGAWA ,  Takaaki TAWADA ,  Kenji KOMITO

IPC: G03G21/00 ,  G03G9/10 ,  G03G9/08

Abstract: 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：US20230195005A1

公开(公告)日：2023-06-22

申请号：US18084579

申请日：2022-12-20

Applicant: Taishi YAMASHITA ,  Yohichi KITAGAWA ,  Tsukiko TAKAHASHI ,  Mitsuaki HIROSE ,  Daisuke INOUE

Inventor： Taishi YAMASHITA ,  Yohichi KITAGAWA ,  Tsukiko TAKAHASHI ,  Mitsuaki HIROSE ,  Daisuke INOUE

IPC: G03G9/097 ,  G03G9/087 ,  G03G9/08 ,  G03G15/08

CPC classification number: G03G9/09791 ,  G03G9/08711 ,  G03G9/0819 ,  G03G15/0865

Abstract: Provided is a toner including toner particles. Each of the toner particles includes a toner base particle including a binder resin, resin particles covering the toner base particle, and zinc stearate particles serving as an external additive. In each of the toner particles, a coverage rate of the toner base particle with the resin particles is 30% or greater and 70% or less. The zinc stearate particles have a volume average particle diameter of 3 μm or greater and 20 μm or less.

公开(公告)号：US20230152724A1

公开(公告)日：2023-05-18

申请号：US17983408

申请日：2022-11-09

Applicant: Suzuka KARATO ,  Mitsuaki HIROSE ,  Hiroshi YAMADA ,  Yohichi KITAGAWA ,  Tsukiko TAKAHASHI

Inventor： Suzuka KARATO ,  Mitsuaki HIROSE ,  Hiroshi YAMADA ,  Yohichi KITAGAWA ,  Tsukiko TAKAHASHI

IPC: G03G9/087 ,  G03G9/08

CPC classification number: G03G9/08711 ,  G03G9/0819 ,  G03G9/0825 ,  G03G2215/16

Abstract: A toner includes toner base particles each including a binder resin and a releasing agent, resin particles, and an external additive. Resin particles, from among the resin particles in the toner, and the external additive are deposited on a surface of each of the toner base particles. A standard deviation of a distance between resin particles next to one another on the surface is less than 600 nm, the resin particles next to one another being from among the resin particles deposited on the surface. The external additive includes primary particles each standing alone and non-spherical cohesive particles each including cohered primary particles. A proportion of the primary particles each standing alone per 1,000 particles of the external additive is 30% or less, the particles of the external additive in the per 1,000 particles being the primary particles each standing alone and the cohesive particles.

公开(公告)号：US11054757B2

公开(公告)日：2021-07-06

申请号：US16583861

申请日：2019-09-26

Applicant: Yohichi Kitagawa ,  Keiji Makabe ,  Yuka Mizoguchi ,  Tsuneyasu Nagatomo ,  Shinya Nakayama

Inventor： Yohichi Kitagawa ,  Keiji Makabe ,  Yuka Mizoguchi ,  Tsuneyasu Nagatomo ,  Shinya Nakayama

IPC: G03G9/087 ,  G03G9/08 ,  G03G21/18 ,  G03G15/08

Abstract: A toner including toner base particles each including a binder resin and a colorant, and external additive, wherein the toner satisfies conditions (a), (b), and (c) below: (a) storage elastic modulus G′(50) of the toner at 50° C. and storage elastic modulus G′(90) of the toner at 90° C. satisfy Formula (1); G′(50)/G′(90)≥6.0×102  Formula (1) (b) a BET specific surface area Bt(m2/g) of the toner and a coverage Ct (%) of the toner base particles covered with the external additive satisfy Formula (2); and Bt−0.03×Ct≤1.60  Formula (2) (c) the external additive includes at least cohered particles, the cohered particles are non-spherical secondary particles each formed through cohesion of primary particles, and a number average secondary particle diameter of the cohered particles is 130 nm or greater.

公开(公告)号：US20230280670A1

公开(公告)日：2023-09-07

申请号：US18175757

申请日：2023-02-28

Applicant: Tsukiko TAKAHASHI ,  Mitsuaki Hirose ,  Yohichi Kitagawa ,  Suzuka Karato ,  Hiroshi Yamada

Inventor： Tsukiko TAKAHASHI ,  Mitsuaki Hirose ,  Yohichi Kitagawa ,  Suzuka Karato ,  Hiroshi Yamada

IPC: G03G9/097 ,  G03G15/08 ,  G03G9/08 ,  C08G63/16 ,  G03G9/087

CPC classification number: G03G9/09716 ,  G03G15/0865 ,  G03G9/0825 ,  G03G9/09725 ,  C08G63/16 ,  G03G9/08755 ,  G03G9/09708

Abstract: [Summary] An object of the present invention is to provide a toner that has both low-temperature fixability and heat-resistant storage stability, suppresses contamination of cleaning parts and photoconductors, and has excellent charging stability.
[Tasks] A toner includes toner based particles containing a binder resin, a colorant, and a wax; and fine resin particles and an inorganic external additive that are present on a surface of the toner based particles, wherein a coverage of the fine resin particles is in a range from 30% to 70%, and wherein the inorganic external additive covers a surface of oxide of a metal element with hydroxide of a metal element.

公开(公告)号：US20230161276A1

公开(公告)日：2023-05-25

申请号：US17991846

申请日：2022-11-22

Applicant: Mitsuaki HIROSE ,  Daisuke INOUE ,  Yohichi KITAGAWA ,  Tsukiko TAKAHASHI ,  Kenji KOMITO ,  Akihiko MOKI

Inventor： Mitsuaki HIROSE ,  Daisuke INOUE ,  Yohichi KITAGAWA ,  Tsukiko TAKAHASHI ,  Kenji KOMITO ,  Akihiko MOKI

IPC: G03G9/08 ,  G03G9/087

CPC classification number: G03G9/0821 ,  G03G9/0804 ,  G03G9/0827 ,  G03G9/08728

Abstract: Provided is a toner including toner particles. Each of the toner particles includes a toner base particle including a binder resin and a release agent. The toner particles have an average circularity of 0.974 or greater and 0.985 or less. An arithmetic mean height Sa of surfaces of the toner particles is 45 nm or greater. The toner particles have a BET specific surface area of 1.3 m2/g or greater and 2.5 m2/g or less.

公开(公告)号：US20230040461A1

公开(公告)日：2023-02-09

申请号：US17814644

申请日：2022-07-25

Applicant: Daisuke Inoue ,  Mitsuaki Hirose ,  Yohichi Kitagawa ,  Tsukiko Takahashi ,  Kenji Komito ,  Akihiko Moki

Inventor： Daisuke Inoue ,  Mitsuaki Hirose ,  Yohichi Kitagawa ,  Tsukiko Takahashi ,  Kenji Komito ,  Akihiko Moki

IPC: G03G9/097 ,  G03G9/08 ,  G03G9/087 ,  G03G15/08

Abstract: A toner includes: toner base particles including a binder resin, a colorant, an inorganic filler, and a release agent; and an external additive. An average circularity of the toner is 0.974 or more but 0.985 or less. A surface roughness parameter Sz of a surface of the toner is 200 nm or more but 500 nm or less, the surface roughness parameter Sz being measured with an atomic force microscope (AFM).

公开(公告)号：US20220155699A1

公开(公告)日：2022-05-19

申请号：US17501076

申请日：2021-10-14

Applicant: Yohichi KITAGAWA ,  Kenji Komito ,  Masayuki Ukigaya ,  Mitsuaki Hirose ,  Daisuke Inoue

Inventor： Yohichi KITAGAWA ,  Kenji Komito ,  Masayuki Ukigaya ,  Mitsuaki Hirose ,  Daisuke Inoue

IPC: G03G9/087 ,  G03G9/08

Abstract: A toner is provided. The toner comprises toner particles each comprising a toner base particle and an external additive. The toner base particle comprises a binder resin and a colorant. The toner satisfies the following conditions (a) and (b): (a) an average surface roughness Ra [nm] of the toner particles, detected by a scanning probe microscope analyzer, satisfies the following formula (1): 10