公开(公告)号：US20220019151A1

公开(公告)日：2022-01-20

申请号：US17430440

申请日：2020-02-13

Applicant: POWDERTECH CO.,LTD.

Inventor： Aya SAKUTA ,  Makoto ISHIKAWA ,  Hiroki SAWAMOTO ,  Tetsuya UEMURA

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

Abstract: The present invention relates to a carrier including: a magnetic core material; and a resin coating layer coating a surface of the magnetic core material, in which the resin coating layer contains a binder resin, and fluorine element-containing resin particles dispersed in the binder resin, the resin coating layer has a coefficient of variation of a film thickness of 25% or less, and the resin coating layer has an average value of the number of the fluorine element-containing resin particles being 3 particles/μm2 or more and 350 particles/μm2 or less per unit area in a cross section of the resin coating layer, and has a coefficient of variation thereof being 20% or less.

公开(公告)号：US20190049870A1

公开(公告)日：2019-02-14

申请号：US16059405

申请日：2018-08-09

Applicant: POWDERTECH CO., LTD.

Inventor： Aya SAKUTA ,  Makoto ISHIKAWA ,  Hiroki SAWAMOTO ,  Tetsuya UEMURA

IPC: G03G9/107 ,  G03G9/113

Abstract: There is provided a carrier including a magnetic core material having a surface coated with a surfactant-containing resin mixture of an elemental fluorine-containing resin and a polyimide resin. The carrier has an elution amount of an eluted material into water in an elution test ranging from 180 ppm to 3,500 ppm.