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1.发明公开POLYVINYLACETAL RESIN AND PROCESS FOR PRODUCING THE SAME 有权POLYVINYLACETALHARZ UND HERSTELLUNGSVERFAHRENDAFÜR
公开(公告)号：EP1473309A1
公开(公告)日：2004-11-03
申请号：EP03703265.3
申请日：2003-02-07
发明人： MASHIKO, Yoshihiro, /Denki Kagaku Kogyo Kabushiki , KAWANISHI, Toshiaki, /Denki Kagaku Kogyo Kabushiki , MATSUNAGA, Koichi, /Denki Kagaku Kogyo Kabushiki , TSUZUKI, Manabu, /Denki Kagaku Kogyo Kabushiki , MATSUOTO, Kazumasa, /Denki Kagaku Kogyo Kabushiki , GOTO, Koki, /Denki Kagaku Kogyo Kabushiki Kaisha , WATANABE, Hitoshi, /Denki Kagaku Kogyo Kabushiki
CPC分类号： C09D129/14 , C08F8/48 , C08F16/38 , C08F8/28 , C08F16/06
摘要： A polyvinylacetal resin powder with a low metal content, being excellent in transparency, moisture resistance and electrical insulating properties and having a large specific surface area, and a process for its production, are presented. A polyvinylacetal resin powder obtained by reacting polyvinyl alcohol and an aldehyde in the presence of an acid catalyst, which has an acetalization degree of at least 60 mol%, a specific surface area of from 1.50 to 3.50 m 2 /g, a bulk density of from 0.12 to 0.19 g/cm 3 , an average particle diameter of from 0.5 to 2,5 µm and a metal content of at most 80 ppm.
It is produced, for example, by feeding a reaction fluid containing polyvinyl alcohol, an aldehyde and an acid catalyst into a first reactor, to carry out an acetalization reaction, discharging the reaction fluid wherein the acetalization degree has reached from 10 to 60 mol%, and feeding the same into a second reactor to carry out a further reaction to bring the acetalization degree of polyvinylacetal to at least 65 mol%.摘要翻译： 本发明提供一种金属含量低，透明性，耐湿性，电绝缘性优异，比表面积大的聚乙烯醇缩醛树脂粉末及其制造方法。 聚乙烯醇缩醛树脂粉末，其通过聚乙烯醇和醛在酸催化剂存在下反应得到，该酸催化剂的缩醛化度为至少60摩尔％，比表面积为1.50-3.50m 2 / g，体积 密度为0.12〜0.19g / cm 3，平均粒径为0.5〜2.5μm，金属含量为80ppm以下。 例如，通过将含有聚乙烯醇，醛和酸催化剂的反应流体进料到第一反应器中进行缩醛化反应，将缩醛化度达到10℃的反应流体排出 至60mol％，并将其加入到第二反应器中进行进一步的反应，使聚乙烯醇缩醛的缩醛化度为至少65mol％。
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公开(公告)号：EP1473309B1
公开(公告)日：2010-10-13
申请号：EP03703265.3
申请日：2003-02-07
发明人： MASHIKO, Yoshihiro, /Denki Kagaku Kogyo Kabushiki , KAWANISHI, Toshiaki, /Denki Kagaku Kogyo Kabushiki , MATSUNAGA, Koichi, /Denki Kagaku Kogyo Kabushiki , TSUZUKI, Manabu, /Denki Kagaku Kogyo Kabushiki , MATSUOTO, Kazumasa, /Denki Kagaku Kogyo Kabushiki , GOTO, Koki, /Denki Kagaku Kogyo Kabushiki Kaisha , WATANABE, Hitoshi, /Denki Kagaku Kogyo Kabushiki
CPC分类号： C09D129/14 , C08F8/48 , C08F16/38 , C08F8/28 , C08F16/06
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