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    Transparent metal oxide pigment and method for its preparation
    3.
    发明授权
    Transparent metal oxide pigment and method for its preparation 失效
    透明金属氧化物颜料及其制备方法

    公开(公告)号：US5076849A

    公开(公告)日：1991-12-31

    申请号：US456322

    申请日：1989-12-26

    申请人： Pekka J. Vapaaoksa ,  Pekka J. Eskelinen

    发明人： Pekka J. Vapaaoksa ,  Pekka J. Eskelinen

    IPC分类号： C09C1/28 ,  C03C17/23 ,  C09C1/00 ,  C09C1/22 ,  C09C1/24 ,  C09C1/36

    CPC分类号： C09C1/0018 ,  C03C17/23 ,  C09C1/00 ,  C09C1/0021 ,  C09C1/245 ,  C09C1/3607 ,  C01P2002/60 ,  C01P2004/03 ,  C01P2004/20 ,  C01P2004/54 ,  C01P2004/61 ,  C01P2004/82 ,  C01P2006/60 ,  C01P2006/80 ,  C03C2217/229 ,  C03C2218/32 ,  C09C2200/1004 ,  C09C2200/102 ,  C09C2200/301 ,  C09C2200/302 ,  C09C2200/303 ,  C09C2220/10

    摘要： The invention relates to a method for the preparation of transparent metal oxide pigment, in which a substantial portion of the silicon oxide is dissolved off from silicon dioxide based particles coated with transparent metal oxide, and to a transparent metal oxide pigment prepared by the method. In the extraction methods according to the prior art the problem is that in the extraction a part of the metal oxide is also dissolved, whereby thickness variations impairing the interference color of the metal oxide layer are created. Moreover, in the known methods hard-treated extraction chemicals which are detrimental for the environment are used. These problems have by means of the present invention been solved so that such particles are selected for the dissolution whose silicon dioxide portion is substantially soluble in base and metal oxide portion is substantially insoluble in base, and the dissolution is carried out by base. The silicon dioxide based particles can be selected from the beginning base-soluble particles or they can be made base-soluble by extracting them with mineral acid. The shape of the metal oxide particles obtained through base extraction corresponds fragmentarily to the form of the outer surface of the silicon dioxide based particles and they are in the form of single closed sheets or flakes.

    摘要翻译： 本发明涉及一种制备透明金属氧化物颜料的方法，其中大部分氧化硅从涂覆有透明金属氧化物的二氧化硅基颗粒溶出，并且通过该方法制备的透明金属氧化物颜料。 在根据现有技术的提取方法中，问题在于，在提取中，金属氧化物的一部分也溶解，从而产生损害金属氧化物层的干涉色的厚度变化。 此外，在已知的方法中，使用对环境有害的硬处理提取化学品。 通过本发明的这些问题已被解决，使得这些颗粒被选择用于其二氧化硅部分基本上可溶于碱的溶解，金属氧化物部分基本上不溶于碱，并且通过碱进行溶解。 基于二氧化硅的颗粒可以从初始的可溶性颗粒中选择，或者可以通过用无机酸提取它们而使其易溶于碱。 通过碱提取获得的金属氧化物颗粒的形状与二氧化硅基颗粒的外表面的形式不相符，并且它们是单一封闭的片或薄片的形式。

    Process for preparation of micaceous iron oxide
    5.
    发明授权
    Process for preparation of micaceous iron oxide 失效
    云母氧化铁的制备方法

    公开(公告)号：US4289746A

    公开(公告)日：1981-09-15

    申请号：US151538

    申请日：1980-05-19

    申请人： Masanori Hayakawa ,  Satoshi Nishimura

    发明人： Masanori Hayakawa ,  Satoshi Nishimura

    IPC分类号： C01G49/06 ,  C01G49/08 ,  C09C1/24

    CPC分类号： C01G49/06 ,  C01G49/08 ,  C09C1/245 ,  C01P2004/03 ,  C01P2004/20 ,  C01P2004/22 ,  C01P2004/61 ,  C01P2006/80

    摘要： High purity hexagonal plate-like .alpha.-Fe.sub.2 O.sub.3, commonly called micaceous iron oxide, is prepared by a hydrothermal treatment of either magnetite or an iron ore, or an iron oxide, of which principal component is magnetite together with an oxidizer in an aqueous alkali solution. Main advantage of this process is a great decrease in the consumption of alkali. Pure magnetite for use in this process can be prepared economically by a hydrothermal treatment of an iron ore, or an oxide, of which principal component is an oxide of trivalent iron in an aqueous alkali solution together with a compound of divalent iron and/or metallic iron.

    摘要翻译： 高纯度六角板状α-Fe2O3，通常称为云母氧化铁，是通过水热处理磁铁矿或铁矿石或氧化铁制备的，其主要成分是磁铁矿和氧化剂在碱性水溶液中 。 这个过程的主要优点是碱的消耗量大大降低。 在该方法中使用的纯磁铁矿可以通过水热处理铁矿石或氧化物而经济地制备，其中主要成分是碱金属碱溶液中的三价铁的氧化物以及二价铁和/或金属的化合物 铁。

    Production of hematite pigments in the form of platelets
    7.
    发明授权
    Production of hematite pigments in the form of platelets 失效
    生产胶片形式的染色剂

    公开(公告)号：US5244649A

    公开(公告)日：1993-09-14

    申请号：US571512

    申请日：1990-08-23

    申请人： Werner Ostertag ,  Christoph Schwidetzky ,  Norbert Mronga

    发明人： Werner Ostertag ,  Christoph Schwidetzky ,  Norbert Mronga

    IPC分类号： C01G49/06 ,  C09C1/22 ,  C09C1/24

    CPC分类号： C09C1/245 ,  C01P2004/20 ,  C01P2006/62

    摘要： Iron oxides in the form of platelets are produced by hydrothermal treatment of aqueous suspensions containing iron(III) hydroxide or oxide hydrates in the presence of alkali metal hydroxides and of aluminum and/or silicon compounds in two stages. The normality of the alkali is from 0 2 to 2 N in the first stage and is increased by from 0.2 to 2.5 in the second stage.The two-stage process according to the invention makes it possible to produce hematite pigments which are in the form of platelets, have increased luster, larger particle diameter, improved dispersibility and color hues which can be adjusted as desired.

    摘要翻译： 通过在碱金属氢氧化物和铝和/或硅化合物的存在下，在两个阶段水热处理含有氢氧化铁（III）或氧化物水合物的水悬浮液来制备血小板形式的氧化铁。 碱的正常性在第一阶段为0-2〜2N，在第二阶段为0.2〜2.5。 根据本发明的两阶段方法使得可以制备呈血小板形式的赤铁矿颜料，具有增加的光泽，更大的粒径，改善的分散性和可以根据需要调节的色调。