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公开(公告)号：US11556070B2
公开(公告)日：2023-01-17
申请号：US16492488
申请日：2018-03-15
摘要： According to the present invention, there is provided a carrier core material that is formed of ferrite particles in which 48 to 52 mass % of Fe, 16 to 22 mass % of Mn, 1.0 to 3.5 mass % of Mg and 0.05 to 0.5 mass % of Ca are included, and when an electrical resistance value with an applied voltage of 500 V in an environment (in an L/L environment) in which the temperature is 10° C. and the relative humidity is 35% is RL (Ω·cm), and an electrical resistance value with an applied voltage of 500 V in an environment (in an H/H environment) in which the temperature is 30° C. and the relative humidity is 70% is RH (Ω·cm), formula (1) below is satisfied. 0.1≤(log RL−log RH)≤0.3 (1)
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公开(公告)号：US10907257B2
公开(公告)日：2021-02-02
申请号：US15765700
申请日：2016-07-19
摘要： In a projection material for mechanical plating, a steel particle is used as a core, and the surrounding surface thereof is coated with a zinc alloy in which the content of Al is more than 5% by mass but equal to or less than 16% by mass, the content of Mg is equal to or more than 5.5% by mass but equal to or less than 15% by mass and the remaining portion is Zn and an impurity, and the content of Fe is equal to or more than 3% by mass but equal to or less than 80% by mass. In this way, the corrosion resistance of a zinc-based coating itself formed in mechanical plating is remarkably enhanced without dependence on protective coating formation treatment such as chromate treatment.
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公开(公告)号：US09964878B2
公开(公告)日：2018-05-08
申请号：US15553623
申请日：2016-03-01
发明人： Yohei Ishikawa , Shinya Sasaki
CPC分类号： G03G9/0827 , G03G9/0819 , G03G9/107 , G03G9/1075 , G03G9/113 , G03G9/1131 , G03G9/1132
摘要： A carrier core material is represented by a composition formula MxFe3-xO4 (where M is Mn and/or Mg, and X is a total of Mn and Mg and is a substitution number of Fe by Mn and Mg, 0
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公开(公告)号：US09740129B2
公开(公告)日：2017-08-22
申请号：US15031944
申请日：2014-10-29
发明人： Shinya Sasaki , Yohei Ishikawa , Haruka Seki
CPC分类号： G03G9/1075 , C01G49/0018 , C01G49/0072 , C01P2004/03 , C01P2004/61 , C01P2006/40 , G03G9/107 , G03G9/1132 , G03G9/1136 , H01F1/36
摘要： Ferrite particles have, as a main component, a material represented by a composition formula MxFe3−xO4 (where M is at least one type of metal selected from a group made of Mg, Mn, Ca, Ti, Cu, Zn, Sr and Ni, 0
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5.发明授权Ferrite particles and electrophotographic development carrier using same, electrophotographic developer and method of manufacturing ferrite particles 有权铁氧体颗粒和使用其的电子照相显影载体，电子照相显影剂和制造铁氧体颗粒的方法公开(公告)号：US09507285B2
公开(公告)日：2016-11-29
申请号：US14773973
申请日：2014-02-26
发明人： Takeshi Kawauchi , Shou Ogawa , Yukihiro Matsuda
CPC分类号： G03G9/107 , C01G49/0036 , C01G49/0072 , C01P2004/03 , C01P2004/61 , C01P2006/10 , C01P2006/42 , C04B35/26 , C04B35/6261 , C04B35/62645 , C04B35/62655 , C04B35/62695 , C04B35/64 , C04B2235/3213 , C04B2235/3262 , C04B2235/3263 , C04B2235/3274 , C04B2235/424 , C04B2235/442 , C04B2235/5436 , C04B2235/5445 , C04B2235/6567 , C04B2235/6583 , C04B2235/6584 , C04B2235/77 , C04B2235/80 , C04B2235/95 , C04B2235/963 , G03G9/0806 , G03G9/1136
摘要： There are provided ferrite particles in which Mn ferrite is used as the main phase and which contain Sr ferrite, where the degree of projections and recesses in the surface of the particles falls within a range of 2.5 to 4.5 μm, and the standard deviation of the size of grains appearing on the surface of the particles falls within a range of 1.5 to 3.5 μm. In this way, a coating resin is left on the surface of the particles even after long-term use and thus a decrease in the charging property is reduced.
摘要翻译： 提供了铁氧体颗粒，其中使用Mn铁氧体作为主相，并且包含Sr铁氧体，其中颗粒表面中的突起和凹陷的程度在2.5至4.5μm的范围内，标准偏差 出现在颗粒表面的晶粒尺寸在1.5至3.5μm的范围内。 以这种方式，即使长期使用，涂层树脂也留在颗粒的表面上，因此带电性能的降低降低。
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6.发明公开公开(公告)号：US20240201612A1
公开(公告)日：2024-06-20
申请号：US18287111
申请日：2022-04-19
发明人： Shinya SASAKI
CPC分类号： G03G9/108 , G03G9/1075 , G03G15/0865
摘要： A carrier core material includes ferrite particles, contains CaSiO3, and has a true density at least equal to 3.5 g/cm3 and at most equal to 4.5 g/cm3. A particle strength index calculated from formula (1) is preferably at most equal to 1.5% by volume. (1): Particle strength index=V2−V1 (In the formula, V1: cumulative value (% by volume) of particle size 22 μm or less in cumulative particle size distribution of carrier core material before crushing test, and V2: cumulative value (% by volume) of particle size 22 μm or less in cumulative particle size distribution of carrier core material after crushing test) Crushing test conditions: 30 g of carrier core material crushed using a sample mill for 60 seconds at a rotational speed of 14000 rpm.
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7.发明授权公开(公告)号：US10915034B2
公开(公告)日：2021-02-09
申请号：US16491365
申请日：2018-03-15
发明人： Shou Ogawa
摘要： A carrier core material is represented by a composition formula MXFe3-XO4 (where M is at least one type of metal element selected from Mg, Mn, Ca, Ti, Cu, Zn and Ni, 0
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公开(公告)号：US10088764B2
公开(公告)日：2018-10-02
申请号：US15555646
申请日：2016-03-22
发明人： Yuto Kamai , Takeshi Kawauchi
摘要： A carrier core material includes, a main component, a material represented by a composition formula MnXMYFe3−(X+Y)O4 (where M is selected from Mg, Ti, Cu, Zn and Ni, 0
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9.发明授权Method for manufacturing carrier core particles for electrophotographic developer 有权制造电子照相显影剂载体核心颗粒的方法公开(公告)号：US09274446B2
公开(公告)日：2016-03-01
申请号：US14112960
申请日：2012-11-30
发明人： Takeshi Kawauchi
CPC分类号： G03G9/107 , G03G9/0812 , G03G9/0819 , G03G9/10 , G03G9/1075 , G03G9/113 , G03G9/1131 , G03G9/1132
摘要： A method for manufacturing carrier core particles for electrophotographic developer that include manganese, magnesium, and iron as a core composition. The method includes a granulation step (A) of granulating a mixture of raw materials containing manganese, magnesium, and iron with a reducing agent added at a ratio of 0.10% to 1.00% by mass to a total mass of the raw materials containing manganese, magnesium, and iron, and a firing step of firing the granular material granulated in the granulation step. The firing step includes a first heating step (C) of applying heat at a constant temperature ranging from 500° C. to 800° C. in an atmosphere with an oxygen concentration of 1000 ppm to 15000 ppm for a predetermined period of time and a second heating step (D) of applying heat at a temperature higher than 800° C. for a predetermined period of time after the first heating step.
摘要翻译： 一种用于制造包含锰，镁和铁作为芯组合物的电子照相显影剂用载体芯颗粒的方法。 该方法包括将含有锰，镁和铁的原料的混合物与以含有锰的原料的总质量相对于0.10质量％至1.00质量％的比例添加的还原剂的造粒步骤（A） 镁和铁，以及烧成在造粒工序中造粒的粒状物的烧成工序。 烧成工序包括在氧浓度为1000ppm〜15000ppm的气氛中，在规定时间内在500〜800℃的恒定温度下进行加热的第一加热工序（C）， 第二加热步骤（D），其在高于800℃的温度下在第一加热步骤之后的预定时间段内进行加热。
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10.发明申请METHOD FOR MANUFACTURING CARRIER CORE PARTICLES FOR ELECTROPHOTOGRAPHIC DEVELOPER, CARRIER CORE PARTICLES FOR ELECTROPHOTOGRAPHIC DEVELOPER, CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, AND ELECTROPHOTOGRAPHIC DEVELOPER 有权用于制造用于电子显影开发商的载体核心颗粒的方法，用于电子显影开发者的载体核心颗粒，电摄影开发者的载体和电摄影开发者公开(公告)号：US20140242511A1
公开(公告)日：2014-08-28
申请号：US14184848
申请日：2014-02-20
发明人： Takeshi KAWAUCHI , SHO OGAWA , HARUKA SEKI
CPC分类号： G03G9/107 , C01G49/0072 , C01P2002/50 , C01P2002/52 , C01P2004/32 , C01P2006/12 , C01P2006/42 , C04B35/26 , C04B35/2633 , C04B35/62695 , C04B2235/3208 , C04B2235/3213 , C04B2235/3262 , G03G9/10 , G03G9/1132
摘要： Provided is a method for manufacturing carrier core particles for electrophotographic developer capable of stably maintaining high chargeability over a long time. The method for manufacturing carrier core particles includes a granulation step of granulating a mixture of raw materials containing manganese, iron, strontium, and calcium and a firing step of firing the mixture granulated in the granulation step. The firing step includes a heating process of heating the granular mixture with an increase in temperature to a predetermined degree and a cooling process of cooling the granular mixture, after the heating process, in an atmosphere with an oxygen concentration ranging from 5000 ppm to 20000 ppm. The molar ratio of the sum of strontium and calcium to the sum of the manganese, iron, strontium, and calcium is 0.0026 to 0.013.
摘要翻译： 提供一种用于制造能够长时间稳定地保持高带电性的电子照相显影剂的载体芯颗粒的制造方法。 制造载体芯颗粒的方法包括造粒步骤，其对含有锰，铁，锶和钙的原料的混合物进行造粒，并且在造粒步骤中烧制混合物的烧成步骤。 烧成工序包括：在氧化浓度为5000ppm〜20000ppm的气氛中，将加热后的粒状混合物在温度上升到规定的程度的加热处理和冷却加热后的粒状混合物的冷却工序 。 锶和钙之和与锰，铁，锶和钙之和的摩尔比为0.0026至0.013。
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