公开(公告)号：US20190137902A1

公开(公告)日：2019-05-09

申请号：US16138485

申请日：2018-09-21

Applicant: Konica Minolta, Inc.

Inventor： Koji Shibata ,  Shinya Obara ,  Satoshi Uchino

IPC: G03G9/113 ,  G03G9/08 ,  G03G9/107 ,  G03G9/083

CPC classification number: G03G9/1133 ,  G03G9/0819 ,  G03G9/0823 ,  G03G9/0827 ,  G03G9/0834 ,  G03G9/08755 ,  G03G9/09708 ,  G03G9/09716 ,  G03G9/1075 ,  G03G9/1139

Abstract: Provided is a two-component developer for developing an electrostatic latent image incorporating: toner particles each containing a toner mother particle having an external additive on a surface of the toner mother particle; and carrier particles each having a core material particle and a covering layer containing a resin on a surface of the core material particle, wherein the external additive contains inorganic particles; the inorganic particles are subjected to surface modification with silicone oil; a carbon content remained on a surface of the inorganic particle after the surface modification is within 3.0 to 10.0 mass %; a free carbon ratio on the surface of the inorganic particle is 70.0% or more; the carrier particles have a resistance in the range of 1.0×109 to 5.0×1010 Ω·cm; and the resin in the covering layer contains a resin formed from a monomer containing an alicyclic methacrylic acid ester monomer.

公开(公告)号：US10168630B2

公开(公告)日：2019-01-01

申请号：US15916896

申请日：2018-03-09

Applicant: Konica Minolta, Inc.

Inventor： Satoshi Uchino ,  Shinya Obara ,  Futoshi Kadonome

IPC: G03G9/097 ,  G03G9/08 ,  C01F17/00 ,  C01G23/00 ,  G03G9/093

Abstract: A toner for developing electrostatic images, including toner particles containing an external additive on surfaces of toner matrix particles. The external additive contains at least a lanthanum-containing titanate compound.

公开(公告)号：US09915884B2

公开(公告)日：2018-03-13

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

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.