公开(公告)号：US20230144641A1

公开(公告)日：2023-05-11

申请号：US17915348

申请日：2021-03-17

Applicant: POWDERTECH CO.,LTD.

Inventor： Makoto ISHIKAWA ,  Tetsuya UEMURA

IPC: G03G9/107 ,  G03G9/113

CPC classification number: G03G9/1085 ,  G03G9/1132

Abstract: The present invention relates to a ferrite particle containing a crystal phase component containing a perovskite crystal represented by a compositional formula: RZrO3 (provided that R represents an alkaline earth metal element), having a surface roughness Rz of 2.0 μm or more and 4.5 μm or less, and satisfying the following formulas: 6.5≤log H1000≤8.5 and 0.80≤log H1000/log H100≤1.00. The ferrite particle can be used as an electrophotographic developer carrier core material. In addition, an electrophotographic developer carrier and an electrophotographic developer can be obtained.

公开(公告)号：US20140295342A1

公开(公告)日：2014-10-02

申请号：US14227564

申请日：2014-03-27

Applicant: POWDERTECH CO., LTD.

Inventor： Makoto ISHIKAWA ,  Tetsuya UEMURA ,  Masashi AOKI

IPC: G03G9/113

CPC classification number: G03G9/1132 ,  G03G9/1075 ,  G03G9/1133 ,  G03G9/1134 ,  G03G9/1135 ,  G03G9/1136

Abstract: Provided is a resin-coated carrier for an electrophotographic developer, wherein the surface of a magnetic particle is coated with a mixed resin composed of two resins, and when the two resins are denoted by the resin 1 and the resin 2, respectively, the relative difference between the respective adsorbed moisture amounts of the resin 1 and the resin 2 at a temperature of 30° C. and a relative humidity of 80% satisfies the following formula (1): 1≦|ax−b(100−x)|≦10  (1) a: the adsorbed moisture content (% by weight) of the resin 1 b: the adsorbed moisture content (% by weight) of the resin 2 x: the content percentage of the resin 1 (0

Abstract translation: 提供一种用于电子照相显影剂的树脂涂覆载体，其中磁性颗粒的表面涂覆有由两种树脂组成的混合树脂，并且当两种树脂分别由树脂1和树脂2表示时，相对 在30℃，相对湿度80％的树脂1和树脂2的各吸附水分量之间的差别满足下式（1）：1＆nlE; | ax-b（100-x）| ＆lt; nlE; 10（1）a：树脂1b的吸附水分含量（重量％）b：树脂吸附的水分含量（重量％）2 x：树脂1的含量百分比（0