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1. 发明申请

WO2003089524A1 KAOLIN PIGMENT HAVING HIGH BRIGHTNESS AND NARROW PARTICLE SIZE DISTRIBUTION AND METHOD OF PREPARATION THEREFOR 审中-公开
标题翻译：具有高亮度和窄幅粒度分布的KAOLIN颜料及其制备方法
公开(公告)号：WO2003089524A1
公开(公告)日：2003-10-30
申请号：PCT/US2003/001063
申请日：2003-01-29
申请人： IMERYS PIGMENTS, INC. , PRING, Graham, M. , GOLLEY, Christopher, R., L.
发明人： PRING, Graham, M. , GOLLEY, Christopher, R., L.
IPC分类号： C09C1/42
CPC分类号： D21H19/40 , C01P2004/62 , C01P2006/60 , C09C1/42 , D21H17/68 , D21H21/52
摘要： (061)The present invention provides high brightness kaolins exhibiting a Brightness (GE) of at least about 90.0. The hydrous kaolin pigments of the present invention may also have, inter alia , a steepness index (d 30 /d 70 X 100) of at least about 39 and/or a titania concentration less than or equal to about 0.40% by weight of the pigment on a dry basis. (062) The hydrous kaolin pigment is produced by a process comprising: a) forming an aqueous suspension of a hydrous kaolin clay; b) forming a primary product by subjecting the suspension to classification or a combination of classification and griding; c), separating the kaolin from impurities by selective flocculation; and d) defining the separated kaolin. (063) The hydrous kaolins of the present invention allow coated papers to be produced at high brightness while maintaining acidic conditions on a paper machine. The invention pigmets exhibit brightness levels unexpectedly higher, e.g., about 2 to about 2.5 or more (GE) units brighter, than exhibited by previous high brightness hydrous kaolin pigments, without sacrificing other important paper properties. Paper coated with the inventive pigmants have high brightness, high whiteness, and high fluorescence levels. The present invention encompasses these pigments, compositions comprising them, and any application in which they are used.
摘要翻译：（061）本发明提供了表现出至少约90.0的亮度（GE）的高亮度高岭土。本发明的含水高岭土颜料还可以具有至少约39的陡度指数（d30 / d70×100）和/或小于或等于约0.40重量％的颜料的二氧化钛浓度干基。（062）含水高岭土颜料通过以下方法制备，所述方法包括：a）形成含水高岭土的水悬浮液; b）通过对悬浮液进行分级或分级和研磨的组合来形成初级产品; c）通过选择性絮凝将高岭土与杂质分离; 和d）限定分离的高岭土。（063）本发明的含水高岭土使得在造纸机上保持酸性条件下以高亮度生产涂布纸。本发明的清洁料具有比以前的高亮度含水高岭土颜料表现出的亮度高出意料之高，例如约2至约2.5或更多（GE）单元更亮，而不牺牲其它重要的纸张性能。用本发明的染色剂涂布的纸具有高亮度，高白度和高荧光水平。本发明包括这些颜料，包含它们的组合物以及使用它们的任何应用。

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