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    Process for producing silica particles suitable for use as filler for paper
    1.
    发明申请
    Process for producing silica particles suitable for use as filler for paper 失效
    适用于纸张填料的二氧化硅颗粒的生产方法

    公开(公告)号：US20010018038A1

    公开(公告)日：2001-08-30

    申请号：US09832948

    申请日：2001-04-12

    申请人： Oji Paper Co., Ltd.

    发明人： Masashi Matsuda ,  Masasuke Watanabe ,  Hitoshi Okada ,  Motohide Wada ,  Osamu Kitao

    IPC分类号： C01B033/12

    CPC分类号： C01B33/187 ,  C01B33/18 ,  C01P2004/52 ,  C01P2004/61 ,  C01P2006/10 ,  C01P2006/12 ,  C01P2006/14 ,  C01P2006/16 ,  C01P2006/19 ,  C01P2006/60 ,  D21H17/68 ,  D21H21/52

    摘要： The present invention relates to a process for easily and efficiently producing silica particles having a narrow particle size distribution and a high porosity from inexpensive starting materials such as sodium silicate. The silica particles of the present invention can be obtained in the form of a slurry containing them by (1) forming a slurry by mixing first particles difficultly soluble in an alkali and soluble in an acid, with an aqueous alkali silicate solution to form a first slurry containing the first particles, (2) neutralizing the first slurry with a mineral acid to prepare a second slurry containing second particles wherein silica is deposited on the first particles, and (3) adding a mineral acid to the second slurry to dissolve the first particles from the second particles, to prepare a third slurry containing silica particles. When the silica particles of the present invention are used as a filler even in a small amount for paper making, the resultant papers have excellent brightness, opacity, opacity-after-printing, etc.

    摘要翻译： 本发明涉及从廉价的原料如硅酸钠容易且有效地生产具有窄的粒度分布和高孔隙率的二氧化硅颗粒的方法。 本发明的二氧化硅颗粒可以通过（1）通过将难溶于碱溶解于酸中的可溶于酸的第一种颗粒与碱性硅酸钠溶液混合形成浆料形成浆料形式而获得， 含有第一颗粒的浆料，（2）用无机酸中和第一浆料，以制备含有二氧化硅沉积在第一颗粒上的第二颗粒的​​第二浆料，和（3）向第二浆料中加入无机酸以溶解第一颗粒 从第二颗粒的​​颗粒，制备含有二氧化硅颗粒的第三浆料。 当本发明的二氧化硅颗粒作为填料即使少量用于造纸时，所得的纸具有优异的亮度，不透明度，印刷后不透明度等。

    Coated paper sheet
    2.
    发明申请
    Coated paper sheet 失效
    涂布纸

    公开(公告)号：US20040001963A1

    公开(公告)日：2004-01-01

    申请号：US10454610

    申请日：2003-06-05

    申请人： OJI PAPER CO., LTD.

    发明人： Harumi Watanabe ,  Atsushi Myojo ,  Hiroyuki Wakasa ,  Osamu Kitao

    IPC分类号： B32B023/08

    CPC分类号： D21H19/828 ,  D21H17/37 ,  D21H19/36 ,  D21H19/40 ,  D21H19/82 ,  D21H21/16 ,  Y10T428/27 ,  Y10T428/273 ,  Y10T428/277 ,  Y10T428/31721 ,  Y10T428/31895 ,  Y10T428/31899 ,  Y10T428/31906 ,  Y10T428/31993

    摘要： A coated paper sheet provided with a coating layer formed on a paper sheet substrate and containing a pigment and a binder and optionally a pre-coated polyacrylamide-containing anionic acrylic resin layer formed between the substrate and coating layer, and having a 75null specular gloss of 70% or more, an air permeability of 4000 seconds or less, a Clark stiffness, in terms of critical strength L, of 12 cm or more in a cross direction and an internal bond strength of 200 mJ or more, exhibits high resistance to blistering, excellent printer-passing property, and high quality image-recording property and useful for both of offset printing and electrophotographic duplicating or printing.

    摘要翻译： 一种涂布纸，其具有形成在纸张基材上并且含有颜料和粘合剂以及任选地在基材和涂层之间形成的预涂布的含聚丙烯酰胺的阴离子丙烯酸树脂层的涂层，并且具有75°镜面光泽度 70％以上，透气度为4000秒以下，临界强度L的克拉克刚度在横向为12cm以上，内部粘合强度为200mJ以上，表现出高的耐 起泡性，良好的打印机传递性能和高质量的图像记录性能，并且对于胶版印刷和电子照相复制或印刷都是有用的。