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    • 2. 发明授权
    • Toner for developing an electrostatic image and process for producing a
toner
    • 用于显影静电图像的调色剂和用于生产调色剂的方法
    • US5985502A
    • 1999-11-16
    • US994030
    • 1997-12-18
    • Yasukazu AyakiTakeshi IkedaTetsuro FukuiYoshinobu BabaHitoshi Itabashi
    • Yasukazu AyakiTakeshi IkedaTetsuro FukuiYoshinobu BabaHitoshi Itabashi
    • G03G9/08G03G9/087
    • G03G9/0806G03G9/0819G03G9/0821G03G9/08795
    • A toner has at least 100 parts by weight of binder resin and 0.1 to 15 parts by weight of colorant. The toner has a number average particle size (Dn) of 0.5 to 6.0 .mu.m, a particle size distribution coefficient (volume average particle size (Dv) / number average particle size (Dn)) of 1.0 to 1.3 and a variation coefficient of particle number distribution of 20% or less.The toner contains 0.1 to 5.0% by weight of methanol-soluble resin component extracted by the first Soxhlet extraction with methanol and 50 to 99% by weight of THF-soluble resin component extracted by a second Soxhlet extraction with tetrahydrofuran (THF) after the Soxhlet extraction with methanol, wherein the maximum glass transition point (Tg.sub.2) of the methanol-soluble resin component and the glass transition point (Tg.sub.1) of the THF-soluble resin component satisfies the following relation;0 (.degree. C.)
    • 调色剂具有至少100重量份的粘合剂树脂和0.1至15重量份的着色剂。 调色剂的数均粒径(Dn)为0.5〜6.0μm,粒径分布系数(体积平均粒径(Dv)/数均粒径(Dn))为1.0〜1.3,粒子的变异系数 数量分布在20%以下。 调色剂含有0.1至5.0重量%的甲醇可溶性树脂组分,通过第一次索格利特甲醇萃取提取甲醇溶解树脂组分,以及50至99重量%的THF可溶性树脂组分,经索氏提取后通过第四次索格利特萃取 用甲醇萃取,其中甲醇可溶性树脂组分的最大玻璃化转变温度(Tg2)和THF可溶性树脂组分的玻璃化转变温度(Tg1)满足以下关系: 0(℃)
    • 5. 发明授权
    • Magnetic coated carrier, two-component type developer and developing
method
    • 磁性涂层载体,双组分型显影剂和显影方法
    • US5766814A
    • 1998-06-16
    • US826678
    • 1997-04-07
    • Yoshinobu BabaTakeshi IkedaYuko SatoHitoshi ItabashiYuzo Tokunaga
    • Yoshinobu BabaTakeshi IkedaYuko SatoHitoshi ItabashiYuzo Tokunaga
    • G03G9/10G03G9/107G03G9/113
    • G03G9/1136G03G9/10G03G9/107
    • A magnetic coated carrier suitable for constituting a two-component type developer for use in electrophotography is composed of magnetic coated carrier particles comprising magnetic carrier core particles and a resinous surface coated layer coating the magnetic carrier core particles. The carrier is suitably constituted so as to satisfy the condition of: (a) the magnetic carrier core particles has a resistivity of at least 1.times.10.sup.10 ohm.cm, and the magnetic coated carrier has a resistivity of at least 1.times.10.sup.12 ohm.cm, (b) the magnetic coated carrier has a number-average particle size of 1-100 .mu.m and has such a particle size distribution that particles having particle sizes of at most a half of the number-average particle size occupy an accumulative percentage of at most 20% by number, (c) the magnetic coated carrier has a shape factor SF-1 of 100-130, (d) the magnetic coated carrier has a magnetization at 1 kilo-oersted of 40-250 emu/cm.sup.3, and (e) the resinous surface coating layer comprises a coating resin composition which in turn comprises a straight silicone resin and a coupling agent. The straight silicone resin includes trifunctional silicon and difunctional silicon in an atomic ratio of 100:0-40:60.
    • 适用于构成用于电子照相术的双组分型显影剂的磁性涂层载体由包括磁性载体芯颗粒的磁性涂覆载体颗粒和涂覆磁性载体芯颗粒的树脂表面涂层组成。 载体适当地构成为满足以下条件:(a)磁性载体芯颗粒具有至少1×10 10欧姆·厘米的电阻率,并且磁性涂覆载体的电阻率至少为1×10 12欧姆·厘米,(b )磁性涂布载体的数均粒径为1-100μm,并且具有这样的粒度分布,使得粒径至多为数均粒径的一半的颗粒占累积百分比至多为20 (c)磁性涂层载体的形状因子SF-1为100-130,(d)磁性涂层载体的磁化强度为1千奥斯特值为40-250emu / cm3,(e) 树脂表面涂层包括涂层树脂组合物,其又包含直的有机硅树脂和偶联剂。 直的有机硅树脂包括原子比为100:0-40:60的三官能硅和二官能硅。
    • 6. 发明授权
    • Carrier for use in electrophotography, two component-type developer and
image forming method
    • 用于电子照相术的载体,双组分型显影剂和图像形成方法
    • US5576133A
    • 1996-11-19
    • US502182
    • 1995-07-13
    • Yoshinobu BabaTakeshi IkedaYasuko AmanoHitoshi Itabashi
    • Yoshinobu BabaTakeshi IkedaYasuko AmanoHitoshi Itabashi
    • G03G9/107
    • G03G9/1075
    • A two component-type developer for electrophotography showing improved electrophotographic performances and also free from carrier adhesion (undesirable carrier transfer to the photosensitive member and recording materials) is constituted by using a magnetic carrier of 5-100 .mu.m in particle size. The carrier has a bulk density of at most 30 g/cm.sup.3, and magnetic properties including: a magnetization of 30-150 emu/cm.sup.3 under a magnetic field strength of 1000 oersted, a magnetization (residual magnetization .sigma..sub.r) of at least 25 emu/cm.sup.3 under a magnetic field strength of zero oersted, a coercive force of less than 300 oersted, and a relationship of:.vertline..sigma..sub.1000 -.sigma..sub.300 .vertline./.sigma..sub.1000 .ltoreq.0.40wherein .sigma..sub.1000 and .sigma..sub.300 denote magnetizations under magnetic field strength of 1000 oersted and 300 oersted, respectively.
    • 通过使用粒径为5-100μm的磁性载体,构成了电子照相显示改善的电子照相性能并且不含载体粘附性(不希望的载体转移到感光构件和记录材料)的双组分型显影剂。 载体的体积密度至多为30g / cm 3,磁特性包括:在1000奥斯特的磁场强度下磁化强度为30-150emu / cm 3,磁化强度(剩余磁化σr)至少为25emu / cm3,磁场强度为零奥斯特,矫顽力小于300奥斯特,关系为:| 西格玛1000西格玛300 | /西格玛1000
    • 8. 发明授权
    • Magnetic coated carrier two-component type developer and developing
method
    • 磁性涂层载体双组分型显影剂和显影方法
    • US6165663A
    • 2000-12-26
    • US422105
    • 1999-10-20
    • Yoshinobu BabaTakeshi IkedaYuko SatoHitoshi ItabashiYuzo Tokunaga
    • Yoshinobu BabaTakeshi IkedaYuko SatoHitoshi ItabashiYuzo Tokunaga
    • G03G9/08G03G9/10G03G9/107G03G9/113G03G13/09
    • G03G9/0827G03G9/0821G03G9/10G03G9/107G03G9/1132G03G9/1136
    • A magnetic coated carrier suitable for constituting a two-component type developer for use in electrophotography is composed of magnetic coated carrier particles comprising magnetic coated carrier particles comprising magnetic carrier core particles each comprising a binder resin and metal oxide particles, and a coating layer surface-coating each carrier core particle. The metal oxide particles have been subjected to a surface lipophilicity-imparting treatment. The magnetic carrier core particles have a resistivity of at least 1.times.10.sup.10 ohm.cm, and the magnetic coated carrier has a resistivity of at least 1.times.10.sup.12 ohm.cm. The magnetic coated carrier has a particle size distribution such that (i) it has a number-average particle size Dn of 5-100 .mu.m, (ii) it satisfies a relationship of Dn/.sigma..gtoreq.3.5, wherein .sigma. denotes a standard deviation of number-basis particle size distribution of the carrier, and (iii) it contains at most 25% by number of particles having particle sizes of at most Dn.times.2/3.
    • 适用于构成用于电子照相术的双组分型显影剂的磁性涂层载体由包括磁性涂覆载体颗粒的磁性涂覆载体颗粒组成,所述磁性涂覆载体颗粒包括各自包含粘合剂树脂和金属氧化物颗粒的磁性载体芯颗粒,以及涂层表面 - 涂覆每个载体芯颗粒。 金属氧化物颗粒已进行表面亲油性赋予处理。 磁性载体芯颗粒具有至少1×10 10欧姆·厘米的电阻率,并且磁性涂覆载体的电阻率至少为1×10 12欧姆·厘米。 磁性涂层载体具有如下的粒度分布:(i)其数均粒径Dn为5-100μm,(ii)满足Dn / sigma = 3.5的关系,其中σ表示 载体的基于数量的粒度分布的标准偏差,和(iii)其含有至多25%数量的粒径至多Dnx + E,fra 2/3 + EE的颗粒。