公开(公告)号：US07385005B2

公开(公告)日：2008-06-10

申请号：US10503123

申请日：2003-02-07

申请人： Yoshihiro Mashiko ,  Toshiaki Kawanishi ,  Koichi Matsunaga ,  Manabu Tsuzuki ,  Kazumasa Matsuoto ,  Koki Goto ,  Hitoshi Watanabe

发明人： Yoshihiro Mashiko ,  Toshiaki Kawanishi ,  Koichi Matsunaga ,  Manabu Tsuzuki ,  Kazumasa Matsuoto ,  Koki Goto ,  Hitoshi Watanabe

IPC分类号： C08F8/00

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 m2/g, a bulk density of from 0.12 to 0.19 g/cm3, 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的聚乙烯醇缩醛树脂粉末，其透明性，耐湿性，电绝缘性优异，比表面积大，其制造方法。 在酸催化剂存在下，使聚乙烯醇与醛反应得到的聚乙烯醇缩醛树脂粉末，其缩醛度为至少60摩尔％，比表面积为1.50〜3.50m 2 / / g，堆积密度为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供给到第一反应器中进行缩醛化反应，将缩醛化度达到10〜60摩尔％的反应液排出， 并将其进料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达到至少65mol％。

公开(公告)号：US20050159545A1

公开(公告)日：2005-07-21

申请号：US10503123

申请日：2003-02-07

申请人： Yoshihiro Mashiko ,  Toshiaki Kawanishi ,  Koichi Matsunaga ,  Manabu Tsuzuki ,  Kazumasa Matsuoto ,  Koki Goto ,  Hitoshi Watanabe

发明人： Yoshihiro Mashiko ,  Toshiaki Kawanishi ,  Koichi Matsunaga ,  Manabu Tsuzuki ,  Kazumasa Matsuoto ,  Koki Goto ,  Hitoshi Watanabe

IPC分类号： C08F8/28 ,  C08F16/38 ,  C09D129/14 ,  C08F8/00

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 m2/g, a bulk density of from 0.12 to 0.19 g/cm3, 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的聚乙烯醇缩醛树脂粉末，其透明性，耐湿性，电绝缘性优异，比表面积大，其制造方法。 在酸催化剂存在下，使聚乙烯醇与醛反应得到的聚乙烯醇缩醛树脂粉末，其缩醛度为至少60摩尔％，比表面积为1.50〜3.50m 2 / / g，堆积密度为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供给到第一反应器中进行缩醛化反应，将缩醛化度达到10〜60摩尔％的反应液排出， 并将其进料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达到至少65mol％。