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    Glass composite magnetic carrier particles
    1.
    发明授权
    Glass composite magnetic carrier particles 失效
    玻璃复合磁性载体颗粒

    公开(公告)号：US5061586A

    公开(公告)日：1991-10-29

    申请号：US504824

    申请日：1990-04-05

    申请人： Bijay S. Saha ,  Thomas A. Jadwin

    发明人： Bijay S. Saha ,  Thomas A. Jadwin

    IPC分类号： G03G9/107

    CPC分类号： G03G9/107

    摘要： Disclosed are two-phase glass composite carrier particles which comprise a composite of a magnetically hard ferrite material having a single phase hexagonal crystalline structure of the formula MO.6Fe.sub.2 O.sub.3 where M is barium, strontium or lead exhibiting a coercivity of at least 300 Oersteds when magnetically saturated and an induced magnetic moment of at least 20 EMU/gm when in an applied field of 1000 Oersteds which is dispersed in a glass matrix comprised of from about 10 to 20 molar percent CuO, from about 10 to 40 molar percent BaO and from about 10 to 40 molar percent B.sub.2 O.sub.3 ; or a glass matrix comprised of from about 10 to 20 molar percent of V.sub.2 O.sub.5, from about 10 to 40 molar percent BaO and from about 10 to 40 molar percent B.sub.2 O.sub.3.Also disclosed is an electrostatic two-phase dry developer composition comprising charged toner particles mixed with oppositely charged carrier particles as described above.A method of developing an electrostatic image by contacting the image with the two-phase dry developer composition also is disclosed. The developer compositions of the invention exhibit reduced toner throw-off and other disclosed advantages.

    摘要翻译： 公开了两相玻璃复合载体颗粒，其包括具有式MO.6Fe 2 O 3的单相六方晶系结构的磁性硬质铁氧体材料的复合物，其中M是钡，锶或铅在磁性上表现出至少300奥斯特的矫顽力 饱和和至少20 EMU / gm的诱导磁矩，当在分散在由约10至20摩尔％的CuO，约10至40摩尔％的BaO和约约10摩尔％的BaO的玻璃基质中的1000个奥斯特的施加场中时， 10〜40摩尔％的B2O3; 或由约10至20摩尔％的V 2 O 5，约10至40摩尔％的BaO和约10至40摩尔％的B 2 O 3组成的玻璃基质。 还公开了一种静电双相干显影剂组合物，其包含与上述相反电荷的载体颗粒混合的带电调色剂颗粒。 公开了通过使图像与两相干显影剂组合物接触来显影静电图像的方法。 本发明的显影剂组合物表现出减少的调色剂脱落和其它公开的优点。

    Size distribution of carrier particles for use in a magnetic brush
    2.
    发明授权
    Size distribution of carrier particles for use in a magnetic brush 失效
    用于磁刷的载体颗粒的尺寸分布

    公开(公告)号：US5381219A

    公开(公告)日：1995-01-10

    申请号：US970520

    申请日：1992-11-02

    申请人： Edward T. Miskinis ,  Orville C. Rodenberg ,  Bijay S. Saha

    发明人： Edward T. Miskinis ,  Orville C. Rodenberg ,  Bijay S. Saha

    IPC分类号： G03G9/107 ,  G03G21/00

    CPC分类号： G03G21/0047 ,  G03G9/107

    摘要： The present invention relates to carrier particles which are used in image reproduction machines that include a magnetic brush for cleaning an imaging member. These carrier particles are utilized by the magnetic brush to clean the imaging member. The carrier particles include magnetic particles having a particle size distribution ranging from about 150 microns in diameter to about 1 micron in diameter. Preferably at least about 50% by weight of the magnetic particles have a diameter of less than about 45 microns. Preferably the carrier particles have an aspect ratio of about 8 and are made of stainless steel or iron.

    摘要翻译： 本发明涉及用于包括用于清洁成像构件的磁刷的图像再现机中的载体颗粒。 这些载体颗粒被磁刷用于清洁成像构件。 载体颗粒包括粒径分布范围从直径约150微米到直径约1微米的磁性颗粒。 优选地，至少约50重量％的磁性颗粒具有小于约45微米的直径。 优选地，载体颗粒具有约8的纵横比并且由不锈钢或铁制成。

    Magnetic carrier particles
    3.
    发明授权
    Magnetic carrier particles 失效
    磁性载体颗粒

    公开(公告)号：US5268249A

    公开(公告)日：1993-12-07

    申请号：US968942

    申请日：1992-10-29

    申请人： Bijay S. Saha ,  Alec N. Mutz

    发明人： Bijay S. Saha ,  Alec N. Mutz

    IPC分类号： C04B35/26 ,  G03G9/107 ,  G03G9/113

    CPC分类号： C04B35/2633 ,  G03G9/107

    摘要： Carrier particles suitable for magnetic brush development comprising hard magnetic ferrite material having a single phase, W-type hexagonal crystalline structure represented by the formula MFe.sub.16 Me.sub.2 O.sub.27 where M is strontium or barium and Me is a divalent transition metal selected from the group consisting of nickel, cobalt, copper, zinc, manganese, magnesium, iron and mixtures thereof, exhibiting a coercivity of approximately 100 to 300 Oersteds when magnetically saturated and an induced magnetic moment of at least 60 EMU/g when in an applied magnetic field of 1000 Oersteds are disclosed. Also disclosed are electrostatic two-component dry developer compositions comprising charged toner particles mixed with oppositely charged carrier particles comprising the magnetically hard ferrite material described above and a method of developing an electrostatic charge pattern by contacting the charge pattern with a two-component dry developer composition described above.The carrier particles provide high development efficiencies and improved image density.

    摘要翻译： 适用于磁刷显影的载体颗粒包括具有由式MFe 16 Me 2 O 27表示的单相W型六方晶系结构的硬磁铁氧体材料，其中M是锶或钡，Me是选自镍，钴的二价过渡金属 ，铜，锌，锰，镁，铁及其混合物，当在1000奥斯特的施加磁场中磁化饱和时具有约100至300奥斯特的矫顽磁力和至少60 EMU / g的感应磁矩。 还公开了静电双组分干显影剂组合物，其包含与包含上述磁性硬质铁氧体材料的带相反电荷的载体颗粒混合的带电调色剂颗粒和通过使电荷图案与双组分干显影剂组合物接触来显影静电荷图案的方法 如上所述。 载体颗粒提供高显影效率和改善的图像密度。

    Interdispersed two-phase ferrite composite and electrographic magnetic carrier particles therefrom
    4.
    发明授权
    Interdispersed two-phase ferrite composite and electrographic magnetic carrier particles therefrom 失效
    介质中的两相铁素体复合材料及其电磁载体颗粒

    公开(公告)号：US5106714A

    公开(公告)日：1992-04-21

    申请号：US561382

    申请日：1990-08-01

    申请人： Bijay S. Saha ,  Alec N. Mutz ,  Robert E. Zeman

    发明人： Bijay S. Saha ,  Alec N. Mutz ,  Robert E. Zeman

    IPC分类号： C01G49/00 ,  C04B35/26 ,  G03G9/107 ,  H01F1/11

    CPC分类号： B82Y30/00 ,  C01G49/009 ,  C04B35/2633 ,  G03G9/1075 ,  C01P2002/32 ,  C01P2002/76 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2004/82 ,  C01P2006/42

    摘要： Disclosed is an interdispersed two-phase ferrite composite which comprises about 0.1 mole to about 1.0 mole of a spinel phase having the general formula MFe.sub.2 O.sub.4 where M is at least one element that forms a spinel ferrite and is selected from the group consisting of cobalt, manganese, iron and mixtures thereof, to about 2.5 moles of a magnetoplumbite phase having the general formula PO.6Fe.sub.2 O.sub.3, where P is selected from the group consisting of stontium, barium, calcium, lead and mixtures thereof.Also disclosed are carrier particles formed from magnetized particles of the composite which optionally can be polymerically coated, an electrostatic two-component dry developer composition comprising charged toner particles mixed with oppositely charged carrier particles formed from magnetized, and optionally polymerically coated, particles of the composite, and a method of developing an electrostastic image by contacting the image with a two-component dry developer composition described above.

    摘要翻译： 公开了一种分散相的两相铁素体复合物，其包含约0.1摩尔至约1.0摩尔具有通式MFe 2 O 4的尖晶石相，其中M为形成尖晶石铁素体的至少一种元素，并且选自钴，锰 ，铁及其混合物，至约2.5摩尔具有通式PO.6Fe2O3的磁铅矿相，其中P选自锶，钡，钙，铅及其混合物。 还公开了由复合材料的磁化颗粒形成的载体颗粒，其任选地可以是聚合物涂覆的静电双组分干显影剂组合物，其包含与带电荷的载体颗粒混合的带电荷的调色剂颗粒和任选地聚合物涂覆的复合材料颗粒 以及通过使图像与上述双组分干显影剂组合物接触来显影静电图像的方法。

    High speed developer compositions with ferrite carriers
    6.
    发明授权
    High speed developer compositions with ferrite carriers 失效
    具有铁氧体载体的高速显影剂组合物

    公开(公告)号：US5500320A

    公开(公告)日：1996-03-19

    申请号：US297462

    申请日：1994-08-29

    申请人： Bijay S. Saha

    发明人： Bijay S. Saha

    IPC分类号： G03G9/107 ,  H01F1/11

    CPC分类号： G03G9/107 ,  H01F1/11

    摘要： Carrier particles for an electrostatographic developer comprising particles of a hard, magnetic ferrite material having a hexagonal crystalline structure of the general formula MO.6 Fe.sub.2 O.sub.3 in which M is strontium, barium or mixtures thereof exhibiting a coercivity of at least 300 Oersteds when magnetically saturated and an induced magnetic moment of at least 20 EMU/g when in an applied magnetic field of 1000 Oersteds and having a number average particle diameter of from 10.0 to 38.0 micrometers.The carrier particles provide developer compositions for magnetic brush development having high development speeds without the loss of copy image quality.

    摘要翻译： 用于静电显影剂的载体颗粒包含具有通式MO 6.6 Fe 2 O 3的六方晶系结构的硬磁体铁氧体材料的颗粒，其中M是锶，钡或其混合物，当磁饱和时表现出至少300奥斯特的矫顽力， 在1000奥斯特的施加磁场中具有至少20 EMU / g的感应磁矩并且具有10.0至38.0微米的数均粒径。 载体颗粒提供具有高显影速度的磁刷显影用显影剂组合物，而不损失复印图像质量。

    Method of preparing electrographic magnetic carrier particles
    7.
    发明授权
    Method of preparing electrographic magnetic carrier particles 失效
    制备电磁磁性载体颗粒的方法

    公开(公告)号：US5306592A

    公开(公告)日：1994-04-26

    申请号：US968925

    申请日：1992-10-29

    申请人： Bijay S. Saha

    发明人： Bijay S. Saha

    IPC分类号： G03G9/107

    CPC分类号： G03G9/107

    摘要： Carrier particles of substantially uniform particle size and substantially spherical shape comprising hard magnetic ferrite material having a single-phase hexagonal crystalline structure of the formula:MO.cndot.(Fe.sub.2 O.sub.3).sub.x (A)where M is strontium or barium and x is 5 to 6 suitable for magnetic brush development of electrostatic charge patterns and having a reduced tendency towards early life dusting, are prepared by:(i) mixing an aqueous solution containing strontium ions and iron (III) ions or barium ions and iron (III) ions in amounts sufficient to provide the strontium ferrite or barium ferrite of formula (A);(ii) reacting the mixture formed in step (i) with an alkaline aqueous ammonium hydroxide solution having an alkalinity of at least 0.1N to form finely divided co-precipitated particles of strontium hydroxide and iron (III) hydroxide or barium hydroxide and iron (III) hydroxide;(iii) separating the co-precipitated particles from the aqueous mother liquor;(iv) washing the resultant co-precipitated particles;(v) mixing the washed co-precipitated particles obtained from step (iv) with an organic binder and water, as a solvent, to form a slurry;(vi) spray drying the slurry to obtain green beads of substantially uniform particle size and substantially spherical shape, and(vii) firing the beads at a temperature ranging from approximately 900.degree. C. to 1100.degree. C. for a period of time of from approximately 7 to 10 hours and obtaining magnetic carrier particles of substantially uniform particle size and substantially spherical shape comprising hard magnetic ferrite material having a single-phase, hexagonal crystalline structure of the formula (A).

    摘要翻译： 具有基本上均匀的粒度和基本上球形的载体颗粒包括具有下式的单相六方晶体结构的硬磁铁氧体材料：MO（固体点）（Fe 2 O 3）x（A），其中M是锶或钡，x为5 通过以下方法制备静电荷图案的磁刷显影，并且具有降低的早期吸尘倾向：（i）将含有锶离子和铁（III）离子或钡离子和铁（III）离子的水溶液混合 足以提供式（A）的锶铁氧体或钡铁氧体; （ii）使步骤（i）中形成的混合物与碱度为至少0.1N的碱性氢氧化铵水溶液反应，以形成氢氧化锶和氢氧化铁（III）和氢氧化铁（III）的细分散共沉淀颗粒 III）氢氧化物; （iii）从含水母液中分离共沉淀颗粒; （iv）洗涤所得的共沉淀颗粒; （v）将由步骤（iv）获得的洗涤过的共沉淀颗粒与有机粘合剂和水作为溶剂混合以形成浆料; （vi）喷雾干燥该浆料以得到基本上均匀的粒度和基本上球形的生珠，和（vii）在约900摄氏度至1100摄氏度的温度范围内烧制珠粒，持续一段时间 约7至10小时，并获得具有基本上均匀的粒度和基本上球形的磁性载体颗粒，其包含具有式（A）的单相六方晶体结构的硬磁性铁氧体材料。

    Magnetic brush, inner core therefor, and method for making such core
    8.
    发明授权
    Magnetic brush, inner core therefor, and method for making such core 失效
    磁刷，内芯及其制造方法

    公开(公告)号：US4990876A

    公开(公告)日：1991-02-05

    申请号：US408351

    申请日：1989-09-15

    申请人： Ashok K. Agarwala ,  Bijay S. Saha

    发明人： Ashok K. Agarwala ,  Bijay S. Saha

    IPC分类号： G03G15/09

    CPC分类号： G03G15/0921

    摘要： A magnetic brush useful in an electrophotographic apparatus. An outer sleeve is made of non-magnetic metal. An inner core is disposed within the outer sleeve so as to permit relative rotation of the inner core and the outer sleeve. The inner core comprises a shaft, which is made of magnetic or non-magnetic metal, and a magnetic layer covering a generally cylindrical surface of the shaft. The magnetic layer consists essentially of a plasma-sprayed alloy of iron, a rare earth, and boron. The rare earth is selected from the group consisting of neodymium, praseodymium, and mixtures thereof. Neodymium is preferred. A bonding layer may be optionally provided, preferably an alloy of nickel, chromium, aluminum, and yttrium.

    摘要翻译： 用于电子照相设备的磁刷。 外套筒由非磁性金属制成。 内芯设置在外套筒内，以允许内芯和外套筒相对旋转。 内芯包括由磁性或非磁性金属制成的轴和覆盖轴的大致圆柱形表面的磁性层。 磁性层基本上由等离子体喷涂的铁，稀土和硼的合金组成。 稀土选自钕，镨及其混合物。 钕是优选的。 可以任选地提供粘合层，优选镍，铬，铝和钇的合金。