公开(公告)号：US11029618B2

公开(公告)日：2021-06-08

申请号：US16059405

申请日：2018-08-09

Applicant: POWDERTECH CO., LTD.

Inventor： Aya Sakuta ,  Makoto Ishikawa ,  Hiroki Sawamoto ,  Tetsuya Uemura

IPC: G03G9/113

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.

公开(公告)号：US10754271B2

公开(公告)日：2020-08-25

申请号：US16474508

申请日：2017-12-25

Applicant: POWDERTECH CO., LTD.

Inventor： Hiroki Sawamoto ,  Tetsuya Uemura

IPC: G03G9/107 ,  G03G9/113

Abstract: A magnetic core material for electrophotographic developer, satisfying a value of Expression (1): a+b×10+c+d+e+f, being from 300 to 1,300, when an amount of fluorine ion is denoted by a (ppm), an amount of chlorine ion is denoted by b (ppm), an amount of bromide ion is denoted by c (ppm), an amount of nitrite ion is denoted by d (ppm), an amount of nitrate ion is denoted by e (ppm), and an amount of sulfate ion is denoted by f (ppm), which are measured by combustion ion chromatography, and having a BET specific surface area being from 0.06 to 0.25 m2/g.

公开(公告)号：US09201328B2

公开(公告)日：2015-12-01

申请号：US14219162

申请日：2014-03-19

Applicant: POWDERTECH CO., LTD.

Inventor： Hiroki Sawamoto ,  Takao Sugiura

IPC: G03G9/00 ,  G03G9/10 ,  G03G9/113 ,  G03G9/107

CPC classification number: G03G9/10 ,  G03G9/107 ,  G03G9/1075 ,  G03G9/113 ,  G03G9/1132

Abstract: Disclosed are a resin-filled ferrite carrier core material for an electrophotographic developer, including a porous ferrite particle having an average compression strength of 100 mN or more and a coefficient of variation of the compression strength of 50% or less, a ferrite carrier obtained by filling a resin in the voids of the ferrite carrier core material, and an electrophotographic developer using the ferrite carrier.

Abstract translation: 公开了一种用于电子照相显影剂的树脂填充铁氧体载体芯材，包括平均抗压强度为100mN以上，压缩强度变化系数为50％以下的多孔铁氧体颗粒，通过 在铁氧体载体芯材料的空隙中填充树脂，以及使用铁素体载体的电子照相显影剂。