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    • 1. 发明授权
    • Zinc oxide powder having high dispersibility
    • 具有高分散性的氧化锌粉末
    • US5672427A
    • 1997-09-30
    • US298709
    • 1994-08-30
    • Masahiro HagiwaraAkira Nishihara
    • Masahiro HagiwaraAkira Nishihara
    • C01G9/02C09C1/04C09D5/24H01B1/08B32B9/04
    • B82Y30/00C01G9/02C09C1/043C09D5/24H01B1/08C01P2004/62C01P2004/64C01P2006/40C01P2006/60Y10S428/913Y10T428/2991
    • A zinc oxide powder having high dispersibility, which contains one or more metal elements selected from the group consisting of aluminum, silicon, titanium, vanadium, chromium, manganese, iron, cobalt, gallium, germanium, zirconium, indium, tin and hafnium in an amount of from 0.1 to 25 atm. % relative to the total amount of metal elements including zinc. The powder has an average primary particle size of up to 1 .mu.m and a relative transmissivity of at least 0.80. The improved properties are obtained by improving the surface of the powder by immersing the powder in one or more organic liquids selected from the group consisting of alcohols, ketones, amines and esters, and then drying the particles. When containing one or more of aluminum, gallium, germanium, indium and tin, the zinc oxide powder of the invention displays high electric conductivity and is therefore applicable as a conductive pigment.
    • 具有高分散性的氧化锌粉末,其含有一种或多种选自铝,硅,钛,钒,铬,锰,铁,钴,镓,锗,锆,铟,锡和铪的金属元素 量为0.1至25个大气压。 相对于包括锌的金属元素的总量的%。 该粉末的平均一次粒径至多为1μm,相对透射率至少为0.80。 通过将粉末浸入一种或多种选自醇,酮,胺和酯的有机液体中,然后干燥颗粒,从而改善粉末的表面,获得了改进的性能。 当含有铝,镓,锗,铟和锡中的一种或多种时,本发明的氧化锌粉末显示出高导电性,因此可用作导电颜料。
    • 4. 发明授权
    • Hydrophobic silica powder, manufacturing method thereof and developer
for electrophotography
    • 疏水性二氧化硅粉末,其制造方法和电子照相用显影剂
    • US5486420A
    • 1996-01-23
    • US191435
    • 1994-02-03
    • Akira NishiharaAkihiro NakamuraShigehiro Arakawa
    • Akira NishiharaAkihiro NakamuraShigehiro Arakawa
    • C01B33/18C09C1/30G03G9/08G03G9/097B32B5/16
    • C09C1/3081G03G9/09716C01P2006/40C01P2006/90Y10T428/2995Y10T428/2998Y10T428/31612
    • A hydrophobic silica powder, treated with an amino-substituted silane compound represented by the formula (1) and an organopolysiloxane, having an amount of triboelectrification relative to iron of from over +100 .mu.C/g to up to +700 .mu.C/g, and a hydrophobing ratio of at least 60% as measured by the transmittance method:R.sup.1 SiR.sup.2.sub.3-n R.sup.3.sub.n (1)where R.sup.1 is an amino-substituted alkyl group having from 1 to 10 carbon atoms; R.sup.2 is an alkyl group having from 1 to 5 carbon atoms; R.sup.3 is Cl, Br or an alkoxy group having from 1 to 5 carbon atoms; and n is an integer of from 1 to 3. The treatment is preferably carried out with the silica powder in a suspended state. When the hydrophobic silica powder is used as an agent for improving fluidity of a toner, a developer for electrophotography having a stable electrification and which has excellent fluidity can be obtained, and it is possible to clearly develop an electrostatic image free from fog and to obtain stable developing properties with a long service life.
    • 将由式(1)表示的氨基取代的硅烷化合物和有机聚硅氧烷处理的疏水性二氧化硅粉末相对于铁的摩擦带电量为超过+100μC/ g至高达+ 700C / g ,通过透射率法测定的至少60%的疏水率:R1SiR23-nR3n(1)其中R1是具有1至10个碳原子的氨基取代的烷基; R2是具有1至5个碳原子的烷基; R3是Cl,Br或具有1至5个碳原子的烷氧基; n为1〜3的整数。优选以悬浮状态的二氧化硅粉末进行处理。 当疏水性二氧化硅粉末用作改善调色剂的流动性的试剂时,可以获得具有稳定带电并且流动性优异的电子照相用显影剂,并且可以清楚地显现出无雾的静电图像,并获得 稳定的开发性能,使用寿命长。