公开(公告)号：US20220397838A1

公开(公告)日：2022-12-15

申请号：US17659230

申请日：2022-04-14

Applicant: Konica Minolta, Inc.

Inventor： Junya UEDA ,  Yohei MARUYAMA ,  Shinya OBARA

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

Abstract: Provided is an electrostatic latent image developing toner including: toner base particles containing a binder resin and a white pigment; and an external additive, wherein silica particles are contained as the external additive, and the following relational expression (1) is satisfied, Relational expression (1): 0.70≤Wh_Si(B)/Wh_Si(A)≤0.95, in the above relational expression (1), Wh_Si (A) represents an NET intensity of a Si element contained in the white electrostatic latent image developing toner measured by wavelength dispersive X-ray fluorescence spectrometer, and Wh_Si (B) represents an NET intensity of a Si element contained in the white electrostatic latent image developing toner that has been ultrasonically dispersed in water.

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.]