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1. 发明授权

US5486420A Hydrophobic silica powder, manufacturing method thereof and developer for electrophotography 失效
标题翻译：疏水性二氧化硅粉末，其制造方法和电子照相用显影剂
公开(公告)号：US5486420A
公开(公告)日：1996-01-23
申请号：US191435
申请日：1994-02-03
申请人： Akira Nishihara , Akihiro Nakamura , Shigehiro Arakawa
发明人： Akira Nishihara , Akihiro Nakamura , Shigehiro Arakawa
IPC分类号： C01B33/18 , C09C1/30 , G03G9/08 , G03G9/097 , B32B5/16
CPC分类号： C09C1/3081 , G03G9/09716 , C01P2006/40 , C01P2006/90 , Y10T428/2995 , Y10T428/2998 , Y10T428/31612
摘要： 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.
摘要翻译：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。

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