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    • 7. 发明授权
    • Methods for converting linear polyesters to macrocyclic oligoester compositions and macrocyclic oligoesters
    • 将线性聚酯转化为大环低聚酯组合物和大环低聚酯的方法
    • US06525164B2
    • 2003-02-25
    • US09945233
    • 2001-08-31
    • Gary R. Faler
    • Gary R. Faler
    • C08G6378
    • C08G63/81C08G63/183C08G63/78C08G63/85Y02P20/582
    • Macrocyclic oligoesters and compositions comprising macrocyclic oligoesters are prepared from intermediate molecular weight polyesters. In one embodiment, a diol is contacted with a dicarboxylic acid or a dicarboxylate in the presence of a catalyst to produce a composition comprising a hydroxyalkyl-tenninated polyester oligomer. The hydroxyalkyl-terminated polyester oligomer is heated to produce a composition comprising an intermediate molecular weight polyester which preferably has a molecular weight between about 20,000 Daltons and about 70,000 Daltons. The intermediate molecular weight polyester is heated and a solvent is added prior to or during the heating process to produce a composition comprising a macrocyclic oligoester. An optional step is to separate the macrocyclic oligoester from the composition comprising the macrocyclic oligoester.
    • 大环低聚物和包含大环低聚酯的组合物由中等分子量聚酯制备。 在一个实施方案中,二醇在催化剂存在下与二羧酸或二羧酸酯接触以制备包含羟基烷基聚酯低聚物的组合物。 加热羟基烷基封端的聚酯低聚物以产生包含中等分子量聚酯的组合物,其优选具有约20,000道尔顿和约70,000道尔顿之间的分子量。 加热中分子量聚酯并在加热过程之前或期间加入溶剂以产生包含大环低聚酯的组合物。 任选的步骤是将大环寡聚酯与包含大环低聚酯的组合物分离。