Copolycarbonate compositions, and related articles and processes
    18.
    发明授权
    Copolycarbonate compositions, and related articles and processes 失效
    共聚碳酸酯组合物,以及相关的制品和方法

    公开(公告)号:US06706847B2

    公开(公告)日:2004-03-16

    申请号:US10104629

    申请日:2002-03-22

    IPC分类号: C08G6400

    摘要: A thermoplastic composition is described, based on a copolycarbonate which includes at least two structural units. Structure I is usually a conventional carbonate based on bisphenol A, while structure II is a bisphenol carbonate which includes branched or linear groups extending from a bridging carbon atom or carbon group which connects two aromatic rings. The compositions exhibit very good melt flow, along with enhanced shear-thinning behavior. These characteristics are important for optical disc applications. Thus, related articles are described, along with processes for preparing such articles.

    摘要翻译: 基于包含至少两个结构单元的共聚碳酸酯描述热塑性组合物。 结构I通常是基于双酚A的常规碳酸酯,而结构II是双酚碳酸酯,其包括从连接两个芳环的桥连碳原子或碳基延伸的支链或直链基团。 组合物显示非常好的熔体流动,以及增强的剪切稀化行为。 这些特性对于光盘应用很重要。 因此,描述了相关的文章以及制备这些物品的过程。

    Robust process for the synthesis of polyestercarbonates
    19.
    发明授权
    Robust process for the synthesis of polyestercarbonates 有权
    用于合成聚酯碳酸酯的稳健工艺

    公开(公告)号:US06307005B1

    公开(公告)日:2001-10-23

    申请号:US09429669

    申请日:1999-10-29

    IPC分类号: C08G6401

    CPC分类号: C08G63/64 C08G63/79

    摘要: The present invention related to a method for preparing a polyestercarbonate, the method comprising: a) reacting a dihydric phenol and a diacid having from 12 to about 30 carbon atoms in the presence of an effective amount of carbonate precursor, thereby forming a reaction mixture, wherein the pH of the reaction mixture is maintained in an initial pH range of from about 8.5 to about 9.5 for about 50% to about 95% of the total carbonate precursor addition, and a second pH range of from about 10 to about 12 for the remainder of the carbonate precursor addition.

    摘要翻译: 本发明涉及一种制备聚酯碳酸酯的方法,该方法包括:a)在有效量的碳酸酯前体存在下使二元酚与具有12至约30个碳原子的二酸反应,由此形成反应混合物, 其中反应混合物的pH在总碳酸酯前体添加物的约50%至约95%的范围内保持在约8.5至约9.5的初始pH范围内,并且对于所述碳酸酯前体添加物,第二pH范围为约10至约12 剩余的碳酸酯前体添加。