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FERRITE PARTICLE, CARRIER CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPER, CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, AND ELECTROPHOTOGRAPHIC DEVELOPER
To provide a ferrite particle having high strength, including few cracks or chips, and in which carrier scattering can be curbed, a carrier core material for an electrophotographic developer, a carrier for an electrophotographic developer, and an electrophotographic developer.SOLUTION: A ferrite particle includes a crystal phase component consisting of a perovskite type crystal expressed by a composition formula of RZrO3 (here, R represents an alkali earth metal element), and in which, when a particle diameter of individual particles is expressed by a circle equivalent diameter in a cross-section in a reflected electronic image of a particle cross-section photographed by a scanning electron microscope, a content ratio of a particle including an inner hole having the maximum Feret's diameter larger than the particle diameter by more than 15% is 4% or less. The ferrite particle is used as a carrier core material for an electrophotographic developer. Using the ferrite particle, a carrier for an electrophotographic developer and an electrophotographic developer are obtained.SELECTED DRAWING: Figure 1
【課題】本件発明の課題は、高強度であり、割れや欠けが少なく、キャリア飛散の発生を抑制することできるフェライト粒子、電子写真現像剤用キャリア芯材、電子写真現像剤用キャリア及び電子写真現像剤を提供することにある。【解決手段】上記課題を解決するため、ＲＺｒＯ３の組成式（但し、Ｒはアルカリ土類金属元素）で表されるペロブスカイト型結晶からなる結晶相成分を含み、走査型電子顕微鏡により撮影された粒子断面の反射電子像において個々の粒子の粒径を断面における円相当径で表したとき、最大フェレ径が前記粒径の１５％より大きい内部空孔を有する粒子の含有率が４％以下であるフェライト粒子とする。また、電子写真現像剤用キャリア芯材として、当該フェライト粒子を用いる。また、これを用いて、電子写真現像剤用キャリア及び電子写真現像剤を得る。【選択図】図１
FERRITE PARTICLE, CARRIER CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPER, CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, AND ELECTROPHOTOGRAPHIC DEVELOPER
To provide a ferrite particle having high strength, including few cracks or chips, and in which carrier scattering can be curbed, a carrier core material for an electrophotographic developer, a carrier for an electrophotographic developer, and an electrophotographic developer.SOLUTION: A ferrite particle includes a crystal phase component consisting of a perovskite type crystal expressed by a composition formula of RZrO3 (here, R represents an alkali earth metal element), and in which, when a particle diameter of individual particles is expressed by a circle equivalent diameter in a cross-section in a reflected electronic image of a particle cross-section photographed by a scanning electron microscope, a content ratio of a particle including an inner hole having the maximum Feret's diameter larger than the particle diameter by more than 15% is 4% or less. The ferrite particle is used as a carrier core material for an electrophotographic developer. Using the ferrite particle, a carrier for an electrophotographic developer and an electrophotographic developer are obtained.SELECTED DRAWING: Figure 1
【課題】本件発明の課題は、高強度であり、割れや欠けが少なく、キャリア飛散の発生を抑制することできるフェライト粒子、電子写真現像剤用キャリア芯材、電子写真現像剤用キャリア及び電子写真現像剤を提供することにある。【解決手段】上記課題を解決するため、ＲＺｒＯ３の組成式（但し、Ｒはアルカリ土類金属元素）で表されるペロブスカイト型結晶からなる結晶相成分を含み、走査型電子顕微鏡により撮影された粒子断面の反射電子像において個々の粒子の粒径を断面における円相当径で表したとき、最大フェレ径が前記粒径の１５％より大きい内部空孔を有する粒子の含有率が４％以下であるフェライト粒子とする。また、電子写真現像剤用キャリア芯材として、当該フェライト粒子を用いる。また、これを用いて、電子写真現像剤用キャリア及び電子写真現像剤を得る。【選択図】図１
FERRITE PARTICLE, CARRIER CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPER, CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, AND ELECTROPHOTOGRAPHIC DEVELOPER
フェライト粒子、電子写真現像剤用キャリア芯材、電子写真現像剤用キャリア及び電子写真現像剤
ISHIKAWA MAKOTO (author) / UEMURA TETSUYA (author)
2022-03-08
Patent
Electronic Resource
Japanese
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