公开(公告)号：US12204277B2

公开(公告)日：2025-01-21

申请号：US17678125

申请日：2022-02-23

Applicant: Yasuo Kamada ,  Hiroshi Yamada ,  Toma Takebayashi ,  Akio Takei

Inventor： Yasuo Kamada ,  Hiroshi Yamada ,  Toma Takebayashi ,  Akio Takei

IPC: G03G9/08 ,  G03G9/087 ,  G03G15/02

Abstract: Provided is a toner including toner base particles and resin particles. Each toner base particle includes a binder resin, a colorant, and wax. Each resin particle e has a core-shell structure including a core and a shell, where a glass transition temperature TgA of the shell is higher than a glass transition temperature TgB of the core. A surface of each toner base particle is covered with the resin particles. A storage elastic modulus G′1 of the toner at 70° C. during heating is 1.0×105 Pa or greater but 1.0×103 Pa or less, and a storage elastic modulus G′2 of the toner at 100° C. during heating is 1.0×104 Pa or greater but 5.0×104 Pa or less, as the toner is measured by a rheometer.

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：US11592768B2

公开(公告)日：2023-02-28

申请号：US17743449

申请日：2022-05-13

Applicant: Takahiro Honda ,  Yasuo Kamada ,  Hiroshi Yamada

Inventor： Takahiro Honda ,  Yasuo Kamada ,  Hiroshi Yamada

IPC: G03G15/00 ,  G03G15/01 ,  G03G15/16

Abstract: An image forming apparatus includes an image bearer, a developing unit configured to develop a latent image formed on the image bearer with a toner to form a toner image, and a transfer member including a contact area that comes in contact with the image bearer. The toner image is primary transferred from the image bearer to the transfer member. A speed difference between the image bearer and the transfer member at the contact area is 0.1% or greater but 0.8% or less. The toner has an average circularity of 0.971 or greater but 0.986 or less and a shape factor SF-2 of 110 or greater but 119 or less. The speed difference is represented by the following formula: Speed difference [%]={(V1−V2)/V2}×100  [Speed difference] where V1 is a linear speed of the image bearer, and V2 is a linear speed of the transfer member.

公开(公告)号：US20220291602A1

公开(公告)日：2022-09-15

申请号：US17678125

申请日：2022-02-23

Applicant: Yasuo KAMADA ,  Hiroshi Yamada ,  Toma Takebayashi ,  Akio Takei

Inventor： Yasuo KAMADA ,  Hiroshi Yamada ,  Toma Takebayashi ,  Akio Takei

IPC: G03G9/08 ,  G03G9/087 ,  G03G15/02

Abstract: Provided is a toner including toner base particles and resin particles. Each toner base particle includes a binder resin, a colorant, and wax. Each resin particle e has a core-shell structure including a core and a shell, where a glass transition temperature TgA of the shell is higher than a glass transition temperature TgB of the core. A surface of each toner base particle is covered with the resin particles. A storage elastic modulus G′1 of the toner at 70° C. during heating is 1.0×105 Pa or greater but 1.0×103 Pa or less, and a storage elastic modulus G′2 of the toner at 100° C. during heating is 1.0×104 Pa or greater but 5.0×104 Pa or less, as the toner is measured by a rheometer.

公开(公告)号：US10802412B2

公开(公告)日：2020-10-13

申请号：US16812964

申请日：2020-03-09

Applicant: Yuka Aoyama ,  Keiichiro Juri ,  Shinya Nakayama ,  Hiroshi Yamada

Inventor： Yuka Aoyama ,  Keiichiro Juri ,  Shinya Nakayama ,  Hiroshi Yamada

IPC: G03G9/087 ,  G03G15/08 ,  G03G21/00

Abstract: An image forming apparatus including developing unit to develop electrostatic latent image with toner to form visible image, and cleaning unit including elastic member including surface layer and configured to remove the toner, wherein Martens hardness A and Martens hardness B of the surface layer measured by applying load of 1 μN and load of 1,000 μN, respectively, to position of the surface layer in thickness direction thereof using nanoindenter are both 2.5 N/mm2 or greater but 32.5 N/mm2 or less, and Martens hardness A and Martens hardness B satisfy inequality, Martens hardness A>Martens hardness B wherein coefficient of dynamic friction of the surface layer against polycarbonate is 0.5 or less, and the toner includes polyester resin insoluble to THF and Tg of THF-insoluble component of the toner determined from DSC curve of first heating of DSC is −60° C. or higher but 20° C. or lower.

公开(公告)号：US10303071B2

公开(公告)日：2019-05-28

申请号：US15874014

申请日：2018-01-18

Applicant: Hiroyuki Takeda ,  Junichi Awamura ,  Hiroshi Yamada ,  Akira Tanaka

Inventor： Hiroyuki Takeda ,  Junichi Awamura ,  Hiroshi Yamada ,  Akira Tanaka

IPC: G03G9/08 ,  G03G9/087 ,  G03G9/09 ,  G03G21/18 ,  G03G15/20

Abstract: A non-magnetic toner is provided. The non-magnetic toner comprises a polyester resin, a release agent, and a colorant. A storage elastic modulus at 100° C. (G′(100° C.)) of the toner is from 1.0×103 to 1.0×106 Pa, and a storage elastic modulus at 160° C. (G′(160° C.)) of the toner is from 1.0×102 to 1.0×104 Pa. A ratio of loss elastic modulus to storage elastic modulus at 100° C. (tan δ(100° C.)) of the toner is greater than that at 130° C. (tan δ(130° C.)), and the tan δ(100° C.) and the tan δ(130° C.) are each within the range of from 1 to 2.

公开(公告)号：US10126678B2

公开(公告)日：2018-11-13

申请号：US15277456

申请日：2016-09-27

Applicant: Shizuka Hashida ,  Hiroshi Yamashita ,  Minoru Masuda ,  Hiroshi Yamada ,  Masanori Rimoto

Inventor： Shizuka Hashida ,  Hiroshi Yamashita ,  Minoru Masuda ,  Hiroshi Yamada ,  Masanori Rimoto

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

Abstract: A toner includes a binder resin. Particles of a metal complex or a salt of an aromatic carboxylic acid derivative having a number-average particle diameter of from 0.2 μm to 1.0 μm are present on the surface of the toner. A coverage of the particles of a metal complex or a salt of an aromatic carboxylic acid derivative over the surface of the toner is from 10% to 50%.

公开(公告)号：US09964873B2

公开(公告)日：2018-05-08

申请号：US15167182

申请日：2016-05-27

Applicant: Hiroshi Yamashita ,  Minoru Masuda ,  Hiroshi Yamada ,  Shizuka Hashida ,  Masanori Rimoto

Inventor： Hiroshi Yamashita ,  Minoru Masuda ,  Hiroshi Yamada ,  Shizuka Hashida ,  Masanori Rimoto

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

CPC classification number: G03G9/0821 ,  G03G9/08755 ,  G03G15/08

Abstract: A toner fixable on an image bearer with heat. The toner has a first storage modulus of from 1×103 to 1×106 Pa, measured at 100° C. when being heated, and a second storage modulus of from 1×103 to 1×106 Pa, measured at 100° C. when being cooled, the first storage modulus and second storage modulus being measured by a rheometer, and the second storage modulus at 100° C. when being cooled is higher than the first storage modulus at 100° C. when being heated.

公开(公告)号：US09557671B2

公开(公告)日：2017-01-31

申请号：US14629954

申请日：2015-02-24

Applicant: Ryuta Chiba ,  Shinya Nakayama ,  Hiroshi Yamada ,  Minoru Masuda ,  Akinori Saitoh ,  Hideyuki Santo ,  Shinsuke Nagai ,  Akihiro Takeyama ,  Hiroyuki Takeda ,  Tsuyoshi Sugimoto ,  Suzuka Amemori ,  Kohsuke Nagata

Inventor： Ryuta Chiba ,  Shinya Nakayama ,  Hiroshi Yamada ,  Minoru Masuda ,  Akinori Saitoh ,  Hideyuki Santo ,  Shinsuke Nagai ,  Akihiro Takeyama ,  Hiroyuki Takeda ,  Tsuyoshi Sugimoto ,  Suzuka Amemori ,  Kohsuke Nagata

IPC: G03G9/087 ,  G03G9/09

CPC classification number: G03G9/08755 ,  G03G9/08782 ,  G03G9/08795 ,  G03G9/08797 ,  G03G9/0906

Abstract: A toner, including: base particles containing a polyester resin, a colorant, and a release agent, wherein the toner has a glass transition temperature (Tg1st) of 20° C. to 50° C. where the glass transition temperature (Tg1st) is measured in first heating of differential scanning calorimetry (DSC) of the toner, wherein tetrahydrofuran (THF) insoluble matter of the toner has a glass transition temperature [Tg2nd (THF insoluble matter)] of 30° C. or lower where the glass transition temperature [Tg2nd (THF insoluble to matter)] is measured in second heating of differential scanning calorimetry (DSC) of the THF insoluble matter, and wherein 50% or less of the colorant is present within a region of 1,000 nm from a surface of each of the base particles toward a center thereof.

Abstract translation: 一种调色剂，包括：含有聚酯树脂，着色剂和脱模剂的基础颗粒，其中调色剂的玻璃化转变温度（Tg1st）为20℃至50℃，玻璃化转变温度（Tg1st）为 在调色剂的差示扫描量热法（DSC）的第一次加热中测量，其中调色剂的四氢呋喃（THF）不溶物质的玻璃化转变温度[Tg2nd（THF不溶物））为30℃或更低，其中玻璃化转变温度 在THF不溶性物质的差示扫描量热法（DSC）的第二次加热中测量[Tg2nd（THF不溶于物质）]，其中50％以下的着色剂存在于距离每个 基础颗粒朝向其中心。

公开(公告)号：US20160370720A1

公开(公告)日：2016-12-22

申请号：US15167182

申请日：2016-05-27

Applicant: Hiroshi Yamashita ,  Minoru Masuda ,  Hiroshi Yamada ,  Shizuka Hashida ,  Masanori Rimoto

Inventor： Hiroshi Yamashita ,  Minoru Masuda ,  Hiroshi Yamada ,  Shizuka Hashida ,  Masanori Rimoto

IPC: G03G9/00

CPC classification number: G03G9/0821 ,  G03G9/08755 ,  G03G15/08

Abstract: A toner fixable on an image bearer with heat. The toner has a first storage modulus of from 1×103 to 1×106 Pa, measured at 100° C. when being heated, and a second storage modulus of from 1×103 to 1×106 Pa, measured at 100° C. when being cooled, the first storage modulus and second storage modulus being measured by a rheometer, and the second storage modulus at 100° C. when being cooled is higher than the first storage modulus at 100° C. when being heated.

Abstract translation: 调色剂可以固定在具有热量的图像承载体上。 调色剂在100℃下在100℃下测量的第一储能模量为1×10 3至1×10 6 Pa，在100℃下测量的第一储能模量为1×10 3至1×10 6 Pa。 当被冷却时，通过流变仪测量第一储能模量和第二储能模量，并且当被冷却时在100℃下的第二储能模量高于加热时在100℃时的第一储能模量。