Process for the preparation of oligocarbonates
    1.
    发明授权
    Process for the preparation of oligocarbonates 失效
    寡聚碳酸酯的制备方法

    公开(公告)号:US06160156A

    公开(公告)日:2000-12-12

    申请号:US458802

    申请日:1999-12-10

    CPC分类号: C07C68/005 C07C69/96

    摘要: The invention relates to a process for the preparation of aromatic oligocarbonates from dihydroxy compounds, CO and O.sub.2 in the presence of a platinum metal catalyst, a cocatalyst, a quaternary salt and a base, which is carried out in an inert organic solvent which, under the reaction conditions, forms an azeotrope with water, and this azeotrope is removed from the reaction mixture.

    摘要翻译: 本发明涉及一种在铂金属催化剂,助催化剂,季盐和碱的存在下由二羟基化合物CO和O 2制备芳族低聚碳酸酯的方法,其在惰性有机溶剂中进行, 反应条件与水形成共沸物,并将该共沸物从反应混合物中除去。

    Production and use of high molecular weight aliphatic polycarbonates
    7.
    发明授权
    Production and use of high molecular weight aliphatic polycarbonates 失效
    生产和使用高分子量脂肪族聚碳酸酯

    公开(公告)号:US06767986B2

    公开(公告)日:2004-07-27

    申请号:US10420150

    申请日:2003-04-22

    IPC分类号: C08G6400

    CPC分类号: C08G64/305

    摘要: A process for the production of high molecular weight aliphatic polycarbonates is disclosed. The process entails a first stage wherein a low molecular weight aliphatic polycarbonate is prepared and a second stage where the low molecular weight aliphatic polycarbonate is condensed with diaryl carbonate in a melt transesterification process to form a high molecular weight aliphatic polycarbonate. The resulting high molecular weight aliphatic polycarbonate is suitable for the production of extrudates, films and molded articles.

    摘要翻译: 公开了生产高分子量脂族聚碳酸酯的方法。 该方法需要制备第一阶段,其中制备低分子量脂族聚碳酸酯和第二阶段,其中低分子量脂族聚碳酸酯在熔融酯交换方法中与碳酸二芳酯缩合形成高分子量脂族聚碳酸酯。 所得到的高分子量脂族聚碳酸酯适用于生产挤出物,薄膜和模塑制品。