公开(公告)号：US20170123332A1

公开(公告)日：2017-05-04

申请号：US15274304

申请日：2016-09-23

Applicant: Konica Minolta, Inc.

Inventor： Satoshi UCHINO ,  Shinya OBARA ,  Futoshi KADONOME ,  Noriyuki KIMPARA ,  Ikuko SAKURADA ,  Takuya TAKAHASHI

IPC: G03G9/08 ,  G03G9/09 ,  G03G9/087

CPC classification number: G03G9/0827 ,  G03G9/0819 ,  G03G9/08711 ,  G03G9/08755 ,  G03G9/08795 ,  G03G9/08797 ,  G03G9/0918 ,  G03G9/09716 ,  G03G9/09725 ,  G03G9/09791

Abstract: The toner of the present invention contains: a toner base particle, and a silica particle and a fatty acid metal salt particle adhering to a surface of the toner base particle. The toner base particle contains a crystalline polyester resin and an amorphous polyester resin. The toner particle has an average circularity of 0.945 to 0.965. The silica particle has a volume average particle size of 70 to 300 nm, and has an average circularity of 0.5 to 0.9. The fatty acid metal salt particle has a median diameter based on a volume of 0.50 to 2.00 μm.

公开(公告)号：US20200174388A1

公开(公告)日：2020-06-04

申请号：US16658912

申请日：2019-10-21

Applicant: Konica Minolta, Inc.

Inventor： Koji SHIBATA ,  Shinya OBARA ,  Junya UEDA ,  Takuya TAKAHASHI

IPC: G03G9/087 ,  G03G9/097 ,  G03G9/113 ,  G03G9/08

Abstract: It is a two-component developer for electrostatic charge image development, which contains toner containing at least a binder resin and an external additive on a surface and a carrier containing a resin layer at least on a surface of a core material. The binder resin contains a crystalline polyester resin, the external additive contains alumina particles, and the resin layer contains a silicone resin.

公开(公告)号：US20170123334A1

公开(公告)日：2017-05-04

申请号：US15282177

申请日：2016-09-30

Applicant: Konica Minolta, Inc.

Inventor： Noriyuki KIMPARA ,  Satoshi UCHINO ,  Shinya OBARA ,  Futoshi KADONOME ,  Ikuko SAKURADA ,  Takuya TAKAHASHI

IPC: G03G9/087 ,  G03G9/107 ,  G03G9/093 ,  G03G9/08 ,  G03G9/113

CPC classification number: G03G9/08755 ,  G03G9/0819 ,  G03G9/08788 ,  G03G9/08797 ,  G03G9/09791

Abstract: An electrostatic latent image developing toner of the present invention includes toner base particles and particles containing a fatty acid metal salt. The toner base particles contain a crystalline resin containing a segment of a first resin and a segment of a second resin chemically bonded to each other and an amorphous resin containing at least the second resin. The crystalline resin is a hybrid crystalline polyester resin. The first resin is a crystalline polyester resin. The second resin is an amorphous resin. The volume-based median diameter (Da) of the toner base particles and the volume-based median diameter (Db) of the particles containing the fatty acid metal salt satisfy the relations represented by Expressions (1) and (2) below: 0.5 μm≦Db≦2.0 μm  Expression (1) 0.1 Db/Da≦0.5.  Expression (2)

公开(公告)号：US20190354032A1

公开(公告)日：2019-11-21

申请号：US16404179

申请日：2019-05-06

Applicant: Konica Minolta, Inc.

Inventor： Shinya OBARA ,  Koji SHIBATA ,  Junya UEDA ,  Takuya TAKAHASHI ,  Satoshi UCHINO

IPC: G03G9/107 ,  G03G9/08 ,  G03G9/113 ,  G03G9/087

Abstract: To provide a two-component developer for electrostatic charge image development, the two-component developer enabling a high image quality to be kept and enabling the occurrence of fogging to be suppressed even in continuous printing of an image high in coverage rate. The two-component developer for electrostatic charge image development includes a toner particle including a toner base particle and an external additive disposed on the surface of the toner base particle, and a carrier particle including a core material particle and a covering section disposed on the surface of the core material particle, wherein the external additive includes an alumina particle, and the percentage of exposed area of the core material particle is 4.0% or more and 15.0% or less.

公开(公告)号：US20170090324A1

公开(公告)日：2017-03-30

申请号：US15267808

申请日：2016-09-16

Applicant: Konica Minolta, Inc.

Inventor： Futoshi KADONOME ,  Satoshi UCHINO ,  Shinya OBARA ,  Noriyuki KIMPARA ,  Ikuko SAKURADA ,  Takuya TAKAHASHI

IPC: G03G9/097 ,  G03G9/113 ,  G03G9/08 ,  G03G9/087 ,  G03G9/09

CPC classification number: G03G9/09783 ,  G03G9/0819 ,  G03G9/08711 ,  G03G9/08755 ,  G03G9/0918 ,  G03G9/09716 ,  G03G9/09725 ,  G03G9/113 ,  G03G9/1133

Abstract: Provided is an electrostatic image developing toner including a toner mother particle containing a colorant and a binder resin comprising a crystalline resin and an amorphous resin; and an external additive. The external additive includes an inorganic fine particle having a number average major axis in a range of 50 to 100 nm, an average aspect ratio in a range of 3 to 10, and a volume resistivity in a range of 1×1010 to 1×1012 Ω·cm in primary particles.

公开(公告)号：US20190056679A1

公开(公告)日：2019-02-21

申请号：US16104534

申请日：2018-08-17

Applicant: Konica Minolta, Inc.

Inventor： Junya UEDA ,  Satoshi UCHINO ,  Shinya OBARA ,  Takuya TAKAHASHI

IPC: G03G9/097 ,  G03G9/113 ,  G03G9/087

Abstract: An electrostatic latent image developing toner includes toner particles having silica particles as an external additive on surfaces of toner base particles, wherein surfaces of a part or all of the silica particles are modified with silicone oil, and the following relational formula (1) is satisfied. 0.30≤Si(B)/Si(A)≤0.65  relational formula (1) [In the relational formula (1), Si(A) represents a NET intensity of a Si element contained in the electrostatic latent image developing toner, measured by a wavelength dispersive X-ray fluorescence analyzer. Si(B) represents a NET intensity of a Si element contained in the electrostatic latent image developing toner ultrasonically dispersed in water, measured by a wavelength dispersive X-ray fluorescence analyzer.]