公开(公告)号：US10698331B2

公开(公告)日：2020-06-30

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 ,  G03G9/113 ,  G03G9/087 ,  G03G9/08 ,  G03G9/097

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：US10585368B2

公开(公告)日：2020-03-10

申请号：US16194631

申请日：2018-11-19

Applicant: Konica Minolta, Inc.

Inventor： Junya Ueda ,  Shinya Obara ,  Takuya Takahashi ,  Ikuko Sakurada ,  Satoshi Uchino

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

Abstract: Provided is an electrostatic image developing toner containing toner mother particles having external additives on a surface of the mother particle, wherein the external additives contains calcium titanate particles having an average primary particle size in the range of 50 to 150 nm, and alumina particles; and an average primary particle size of the alumina particles is less than the average primary particle size of the calcium titanate particles.

公开(公告)号：US09983495B2

公开(公告)日：2018-05-29

申请号：US15278647

申请日：2016-09-28

Applicant: Konica Minolta, Inc.

Inventor： Junya Ueda ,  Kenshi Miyajima ,  Takaki Kawamura

IPC: G03G9/087

CPC classification number: G03G9/08755 ,  G03G9/0804 ,  G03G9/0812 ,  G03G9/08708 ,  G03G9/08711 ,  G03G9/08733 ,  G03G9/08795 ,  G03G9/08797 ,  G03G9/09321 ,  G03G9/09328 ,  G03G9/09364 ,  G03G9/09371 ,  G03G9/09392

Abstract: An electrostatic image developing toner including a toner particle, wherein the toner particle contains a vinyl resin which is a polymer of a vinyl monomer having an acid group, a polyester resin, at least one of aluminum (Al) and magnesium (Mg), and tin (Sn), and when net intensities of Al, Mg and Sn in the toner particle measured by fluorescent X-ray analysis are respectively expressed as IAl, IMg and ISn, a ratio (IAl+IMg)/ISn is within a range of 0.5 to 2.5.

公开(公告)号：US09897935B2

公开(公告)日：2018-02-20

申请号：US15063930

申请日：2016-03-08

Applicant: Konica Minolta, Inc.

Inventor： Yasuko Uchino ,  Junya Onishi ,  Natsuko Fujisaki ,  Anju Hori ,  Junya Ueda ,  Takaki Kawamura ,  Ikuko Sakurada

IPC: G03G9/10 ,  G03G13/01 ,  G03G9/08 ,  G03G9/113 ,  G03G15/09 ,  G03G15/00

CPC classification number: G03G9/10 ,  G03G9/0823 ,  G03G9/1133 ,  G03G9/1139 ,  G03G13/013 ,  G03G15/09 ,  G03G15/6585 ,  G03G2215/0135 ,  G03G2215/0607 ,  G03G2215/0609

Abstract: An image forming method forms a color toner image and a white toner image using an image forming apparatus having a plurality of developing machines. The color toner image is formed using a color developer containing a first carrier and at least one color toner selected from a yellow toner, a magenta toner, and a cyan toner. The white toner image is formed using a white developer containing a second carrier and a white toner containing at least titanium oxide as a pigment. Formula (1): Iw

公开(公告)号：US10409189B2

公开(公告)日：2019-09-10

申请号：US15799354

申请日：2017-10-31

Applicant: Konica Minolta, Inc.

Inventor： Junya Ueda ,  Satoshi Uchino ,  Shinya Obara ,  Takuya Takahashi

IPC: G03G9/113 ,  G03G9/097 ,  G03G9/08 ,  G03G9/087 ,  G03G9/09 ,  G03G9/093

Abstract: The disclosure concerns an electrostatic latent image developer including: a toner having toner base particles and an external additive; and a carrier, wherein the external additive contains silicone oil-treated silica and titanium oxide, Net intensity of titanium (Ti) in the toner to be measured by X-ray fluorescence analysis is 0.5 to 5 kcps, the carrier has a resin coating layer coating core material particles, and the resin coating layer has a constituent unit formed from an alicyclic (meth)acrylic acid ester.

公开(公告)号：US10241432B2

公开(公告)日：2019-03-26

申请号：US15787033

申请日：2017-10-18

Applicant: Konica Minolta, Inc.

Inventor： Shinya Obara ,  Satoshi Uchino ,  Junya Ueda ,  Takuya Takahashi

IPC: G03G9/087 ,  G03G9/097 ,  G03G9/083 ,  G03G9/08

Abstract: An electrostatically charged image developing toner includes a particulate toner matrix containing an external additive on the surface of the particulate toner matrix. The external additive includes silica particles A and silica particles B. The silica particles A have a number average primary-particle diameter in the range of 40 to 100 nm and an average circularity in the range of 0.50 to 0.90, and are surface-modified with silicone oil. The silica particles B have a number average primary-particle diameter of 25 nm or more and smaller than the number average primary-particle diameter of the silica particles A, and are surface-modified with alkylalkoxysilane having a specific structure or silazane.

公开(公告)号：US10234778B2

公开(公告)日：2019-03-19

申请号：US15699394

申请日：2017-09-08

Applicant: Konica Minolta, Inc.

Inventor： Satoshi Uchino ,  Shinya Obara ,  Junya Ueda ,  Takuya Takahashi

IPC: G03G9/087 ,  G03G9/08 ,  G03G9/093 ,  G03G9/097

Abstract: An electrostatic charge image developing toner includes toner particles including a particulate toner matrix and an external additive adhering to a surface of the particulate toner matrix. The particulate toner matrix includes a crystalline polyester resin. The external additive includes silica particles. The silica particles are secondary particles including primary particles having a diameter in the range of 30 to 90 nm. The secondary particles have an average circularity in the range of 0.25 to 0.50. The secondary particles have an average aspect ratio of 3.0 or more.

公开(公告)号：US20180120721A1

公开(公告)日：2018-05-03

申请号：US15787033

申请日：2017-10-18

Applicant: Konica Minolta, Inc.

Inventor： Shinya Obara ,  Satoshi Uchino ,  Junya Ueda ,  Takuya Takahashi

IPC: G03G9/087 ,  G03G9/083 ,  G03G9/08 ,  G03G9/097

CPC classification number: G03G9/08797 ,  G03G9/0823 ,  G03G9/0833 ,  G03G9/08755 ,  G03G9/08795 ,  G03G9/09708 ,  G03G9/09716 ,  G03G9/09725

Abstract: An electrostatically charged image developing toner includes a particulate toner matrix containing an external additive on the surface of the particulate toner matrix. The external additive includes silica particles A and silica particles B. The silica particles A have a number average primary-particle diameter in the range of 40 to 100 nm and an average circularity in the range of 0.50 to 0.90, and are surface-modified with silicone oil. The silica particles B have a number average primary-particle diameter of 25 nm or more and smaller than the number average primary-particle diameter of the silica particles A, and are surface-modified with alkylalkoxysilane having a specific structure or silazane.

公开(公告)号：US20180074421A1

公开(公告)日：2018-03-15

申请号：US15699394

申请日：2017-09-08

Applicant: Konica Minolta, Inc.

Inventor： Satoshi UCHINO ,  Shinya Obara ,  Junya Ueda ,  Takuya Takahashi

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

CPC classification number: G03G9/08755 ,  G03G9/0821 ,  G03G9/0825 ,  G03G9/0827 ,  G03G9/08711 ,  G03G9/09328 ,  G03G9/09371 ,  G03G9/09378 ,  G03G9/09385 ,  G03G9/09716 ,  G03G9/09725

Abstract: An electrostatic charge image developing toner includes toner particles including a particulate toner matrix and an external additive adhering to a surface of the particulate toner matrix. The particulate toner matrix includes a crystalline polyester resin. The external additive includes silica particles. The silica particles are secondary particles including primary particles having a diameter in the range of 30 to 90 nm. The secondary particles have an average circularity in the range of 0.25 to 0.50. The secondary particles have an average aspect ratio of 3.0 or more.

公开(公告)号：US09915883B2

公开(公告)日：2018-03-13

申请号：US15272670

申请日：2016-09-22

Applicant: Konica Minolta, Inc.

Inventor： Takaki Kawamura ,  Kenshi Miyajima ,  Junya Ueda

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

CPC classification number: G03G9/0821 ,  G03G9/0825 ,  G03G9/08711 ,  G03G9/08755 ,  G03G9/08797 ,  G03G9/093 ,  G03G9/09364 ,  G03G9/09371

Abstract: The toner of the present invention is an electrostatic latent image developing toner, and has a toner base particle. The toner base particle contains a binder resin including a crystalline resin, and a release agent. The toner has the maximum value G′MAX at a temperature equal to or lower than Tm, among specific storage elastic modulus ratios, of 2.2 or more. The Tm represents a peak top temperature (° C.) of a specific endothermic peak in DSC of the toner.