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    Non-silking iron oxide yellow pigments with high color density
    4.
    发明授权
    Non-silking iron oxide yellow pigments with high color density 有权
    无色氧化铁黄色颜料，颜色密度高

    公开(公告)号：US6053972A

    公开(公告)日：2000-04-25

    申请号：US192632

    申请日：1998-11-16

    申请人： Ulrike Pitzer ,  Rolf Naumann ,  Rolf-Michael Braun

    发明人： Ulrike Pitzer ,  Rolf Naumann ,  Rolf-Michael Braun

    IPC分类号： C01G49/02 ,  C08K3/22 ,  C09C1/22 ,  C09C1/24 ,  C09D7/12

    CPC分类号： C09D7/1225 ,  C08K3/22 ,  C09C1/22 ,  C01P2006/60

    摘要： Non-silking iron oxide yellow pigments with high color density.Iron oxide yellow pigments in the .alpha.-FeOOH modification with a silking index of less than 5 were obtained in whicha) .alpha.-FeOOH seeds are produced by precipitation from an Fe(II)-containing solution with an alkaline precipitating agent in the presence of soluble aluminium salts in an amount of 3 to 9 wt. %. calculated as Al.sub.2 O.sub.3, with respect to precipitated .alpha.-FeOOH, and subsequent oxidation to .alpha.-FeOOH andb) pigment growth is performed by precipitating further iron with simultaneous oxidation, wherein the seed/time yield is less than 0.3 h.sup.-1 and the pH value is less than 3.9 over the entire period of pigment growth andc) pigment growth is terminated at a reproduction factor between 3 and 20.

    摘要翻译： 无色氧化铁黄色颜料，颜色密度高。 获得了具有小于5的丝绒指数的α-FeO​​OH改性中的氧化铁黄色颜料，其中a）通过在含碱性沉淀剂的Fe（II）溶液中沉淀，在存在 可溶性铝盐的用量为3〜9wt。 ％。 以Al 2 O 3计算，相对于析出的α-FeO​​OH，随后氧化成α-FeO​​OH，b）通过同时氧化沉淀进一步的铁进行颜料生长，其中种子/时间产率小于0.3h -1，pH 在颜料生长的整个周期中，值小于3.9，c）颜色生长在3和20之间的繁殖因子下终止。