公开(公告)号：US20190339628A1

公开(公告)日：2019-11-07

申请号：US16474497

申请日：2017-12-25

Applicant: POWDERTECH CO., LTD.

Inventor： Hiroki SAWAMOTO ,  Tetsuya UEMURA

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

Abstract: Provided are a magnetic core material for electrophotographic developer and a carrier for electrophotographic developer, which are excellent in charge characteristics and strength and with which a satisfactory image free from defects can be obtained, and a developer containing the carrier.A magnetic core material for electrophotographic developer, having a sulfur component content of from 50 to 700 ppm in terms of a sulfate ion and a BET specific surface area of from 0.06 to 0.25 m2/g.

公开(公告)号：US20160216643A1

公开(公告)日：2016-07-28

申请号：US15007415

申请日：2016-01-27

Applicant: POWDERTECH CO., LTD.

Inventor： Hiroki SAWAMOTO ,  Tetsuya UEMURA

IPC: G03G9/00

CPC classification number: G03G15/0928 ,  G03G9/10 ,  G03G9/1075 ,  G03G9/1131 ,  G03G9/1132 ,  G03G9/1138

Abstract: An object of the present invention is to provide a carrier in which decrease in specific gravity is achieved and a volatile organic compound (VOC) is reduced and to provide an electrophotographic developer using the carrier. There is provided a carrier including a core material coated with a resin, the core material including a magnetic component and a nonmagnetic component, wherein the sum total of volatile organic compounds is 1 ppb or more and 1.5 ppm or less. There is also provided an electrophotographic developer using the carrier.

Abstract translation: 本发明的目的是提供一种其中实现比重降低并且挥发性有机化合物（VOC）减少并使用载体提供电子照相显影剂的载体。 提供了一种载体，其包括涂覆有树脂的芯材，该芯材包括磁性组分和非磁性组分，其中挥发性有机化合物的总和为1ppb以上且1.5ppm以下。 还提供了使用载体的电子照相显影剂。

公开(公告)号：US20150277255A1

公开(公告)日：2015-10-01

申请号：US14673557

申请日：2015-03-30

Applicant: POWDERTECH CO., LTD.

Inventor： Hiroki SAWAMOTO ,  Takao SUGIURA

IPC: G03G9/10

CPC classification number: G03G9/10 ,  G03G9/1075 ,  G03G9/113 ,  G03G9/1131 ,  G03G9/1136 ,  G03G9/1138

Abstract: There is provided a resin-filled ferrite carrier for an electrophotographic developer, in which a void of a porous ferrite particle used as a ferrite carrier core material is filled with silicone resin, wherein a true specific gravity (Y) of the porous ferrite particle filled with the silicone resin and a Si/Fe value (X) measured by fluorescent X-ray elemental analysis satisfy the following inequality (1): −350X≦Y−4.83≦−100X  (1).

Abstract translation: 提供一种用于电子照相显影剂的树脂填充铁氧体载体，其中用作铁氧体载体芯材料的多孔铁氧体颗粒的空隙填充有硅树脂，其中填充的多孔铁氧体颗粒的真比重（Y） 与硅酮树脂和通过荧光X射线元素分析测量的Si / Fe值（X）满足以下不等式（1）：-350X＆lt; 1lE; Y-4.83＆nlE; -100X（1）。

公开(公告)号：US20140287355A1

公开(公告)日：2014-09-25

申请号：US14219162

申请日：2014-03-19

Applicant: POWDERTECH CO., LTD.

Inventor： Hiroki SAWAMOTO ,  Takao SUGIURA

IPC: G03G9/10 ,  G03G9/113

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。