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    METHOD FOR COATING THE SURFACE OF A SUBSTRATE
    1.
    发明公开
    METHOD FOR COATING THE SURFACE OF A SUBSTRATE 审中-公开

    公开(公告)号：EP3400263A2

    公开(公告)日：2018-11-14

    申请号：EP17708158.5

    申请日：2017-01-09

    申请人： KRONOS INTERNATIONAL, INC.

    发明人： BEYER, Norbert

    IPC分类号： C09C1/36 ,  C09C3/06

    摘要： A method for coating the surface of a substrate, such as inorganic particles, with a metal oxide. A suspension is formed containing the substrate, a polyvalent anion and a metal ion where the molar ratio of the polyvalent anion to the metal ion is greater than three and the metal ion is precipitated onto the substrate as a metal oxide. Preferably, the method is used to coat titanium dioxide pigment particles with aluminum oxide.

    VERFAHREN ZUR OBERFLÄCHENBESCHICHTUNG VON ANORGANISCHEN PARTIKELN MIT SILICIUMDIOXID UND MINDESTENS EINER WEITEREN ANORGANISCHEN VERBINDUNG
    4.
    发明公开
    VERFAHREN ZUR OBERFLÄCHENBESCHICHTUNG VON ANORGANISCHEN PARTIKELN MIT SILICIUMDIOXID UND MINDESTENS EINER WEITEREN ANORGANISCHEN VERBINDUNG 审中-公开
    VERFAHREN ZUROBERFLÄCHENBESCHICHTUNGVON ANORGANISCHEN PARTIKELN MIT SILICIUMDIOXID UND MINDESTENS EINER WEITEREN ANORGANISCHEN VERBINDUNG

    公开(公告)号：EP3183301A1

    公开(公告)日：2017-06-28

    申请号：EP15745151.9

    申请日：2015-07-24

    申请人： Kronos International, Inc.

    发明人： BEYER, Norbert ,  FIDALGO-ESTEVEZ, Jud-Reginauld ,  FRAHM, Heiko ,  BLUEMEL, Siegfried

    IPC分类号： C09C1/36 ,  C09C3/06

    摘要： The invention relates to a method for surface coating of inorganic particles in aqueous phase, in particular of titanium oxide pigment particles with a dense silicon dioxide shell and at least one additional inorganic compound, in particular with aluminum oxide, wherein the coating extensively consists of separate layers. The method is characterized in that, following application of the silicon dioxide layer, the particles are separated from the suspension, washed, and heat-treated and then pasted into an aqueous suspension again and coated with at least one additional inorganic compound. The heat treatment preferably occurs at temperatures from 400°C to 800°C. Titanium dioxide pigment particles treated with SiO
    2 and Al
    2 O
    3 according to the invention are characterized by improved tint reducing power, reduced acid solubility, and an isoelectric point shifted to higher pH values.

    摘要翻译： 本发明涉及用二氧化硅和至少一种另外的无机化合物，特别是与氧化铝的稠密表层涂覆水相中的无机颗粒表面，特别是二氧化钛颜料颗粒的表面的方法，其中涂层主要由 的单独图层。 用根据本发明的SiO 2和Al 2 O 3处理的二氧化钛颜料颗粒的特征在于改进的着色强度，降低的酸溶解度和等电点向更高的pH值移动。