Process for preparation of polyethylene terephthalate modified by o-phthalic acid units
    3.
    发明授权
    Process for preparation of polyethylene terephthalate modified by o-phthalic acid units 失效
    由邻苯二甲酸单元改性的聚对苯二甲酸乙二醇酯的制备方法

    公开(公告)号:US06515080B1

    公开(公告)日:2003-02-04

    申请号:US10018535

    申请日:2002-02-05

    IPC分类号: C08F2000

    CPC分类号: C08G63/183 C08G63/78

    摘要: The invention relates to a process to produce polyethylene terephthalate modified with o-phthalic acid units while avoiding any high phthalic acid losses during esterification or polycondensation and while maintaining the favorable use properties effected by the phthalic acid. According to the present invention, a precondensate made of phthalic anhydride and ethylene glycol in a non-catalytic reaction is added in the esterification and/or polycondensation stages, whereby the ethylene glycol is used at a molar excess of 2 to 3.5 relative to the phthalic anhydride.

    摘要翻译: 本发明涉及在邻苯二甲酸单元中改性的聚对苯二甲酸乙二醇酯的制造方法,同时在酯化或缩聚过程中避免任何高的邻苯二甲酸损失,同时保持由邻苯二甲酸所产生的良好使用性能。根据本发明, 在酯化和/或缩聚阶段加入非催化反应中的邻苯二甲酸酐和乙二醇,由此乙二醇的使用量相对于邻苯二甲酸酐的摩尔过量为2〜3.5。

    Catalyst systems for polycondensation reactions
    9.
    发明授权
    Catalyst systems for polycondensation reactions 失效
    用于缩聚反应的催化剂体系

    公开(公告)号:US06828272B2

    公开(公告)日:2004-12-07

    申请号:US10149173

    申请日:2002-10-25

    IPC分类号: B01J2714

    摘要: The invention pertains to new catalyst systems for polycondensation reactions, for example for producing polyethylene terephthalate. In accordance with the invention, complex compounds with hydrotalcite-analogous structures of general formula [M(II)1−xM(III)x(OH)2]x+(An−x/n).mH2O are used, wherein M(II) represents divalent metals, preferably Mg or Zn or NI or Cu or Fe(II) or Co, and M(III) represents trivalent metals, for example Al or Fe(III), and A represents anions, preferably carbonates or borates. These catalysts can be calcinated and can be used in combination with phosphorus compounds that contain at least one hydrolyzable phosphorus-oxygen bond.

    摘要翻译: 本发明涉及用于缩聚反应的新催化剂体系,例如用于生产聚对苯二甲酸乙二醇酯。 根据本发明,使用具有通式[M(II)1-xM(III)x(OH)2] x +(A n-)x / n)·mH 2 O的水滑石 - 类似结构的复合化合物 其中M(II)表示二价金属,优选Mg或Zn或NI或Cu或Fe(II)或Co,M(III)表示三价金属,例如Al或Fe(III),A表示阴离子 碳酸盐或硼酸盐。 这些催化剂可以被煅烧并且可以与含有至少一个可水解的磷 - 氧键的磷化合物组合使用。