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    PROCESS FOR THE PRODUCTION OF POLY(BUTYLENE TEREPHTHALATES)
    3.
    发明公开
    PROCESS FOR THE PRODUCTION OF POLY(BUTYLENE TEREPHTHALATES) 审中-公开
    生产聚（对苯二甲酸丁二酯）的方法

    公开(公告)号：EP3205684A1

    公开(公告)日：2017-08-16

    申请号：EP16155751.7

    申请日：2016-02-15

    申请人： SABIC Global Technologies B.V.

    发明人： KUMAR, Prashant ,  ALIDEDEOGLU, Husnu, Alp

    IPC分类号： C08G63/183 ,  C08G63/78 ,  C08G63/80 ,  C08G63/85

    CPC分类号： C08G63/183 ,  C08G63/78 ,  C08G63/785

    摘要： The present invention relates to a process for the production of poly(butylene terephthalate) comprising the steps of:
    (i) providing a poly(butylene terephthalate) oligomer having an intrinsic viscosity (IV) of 0.25 - 0.35 dl/g, a carboxylic end group (CEG) content of 25-35 mmol/kg, and a ratio of IV: CEG of ≤ 15 dl/mmol;
    (ii) introducing said poly(butylene terephthalate) oligomer to a low-pressure reactor; and
    (iii) performing a polycondensation reaction in said low-pressure reactor by subjecting the poly(butylene terephthalate) oligomer to a pressure of ≥ 0.05 and ≤ 5.0 mbar at a temperature of 235 to 255 °C, for such average residence time to obtain a poly(butylene terephthalate) having a ratio of IV: CEG of ≥ 18 dl/mmol, preferably ≥ 25 dl/mmol and having an IV of ≥ 0.45 dl/g;
    wherein steps (i), (ii) and (iii) are conducted in that order.
    Such process allows for the production of poly(butylene terephthalates) having a desired low CEG at given, desired high, IV using a poly(butylene terephthalate) oligomer having a relatively high CEG at given IV. Such process allows for the production of poly(butylene terephthalates) using poly(butylene terephthalate) oligomers obtained from an esterification process using PTA and 1,4-butanediol.

    摘要翻译： 本发明涉及生产聚（对苯二甲酸丁二醇酯）的方法，其包括以下步骤：（i）提供特性粘度（IV）为0.25-0.35dl / g的聚（对苯二甲酸丁二醇酯）低聚物， （CEG）含量为25-35mmol / kg，并且IV：CEG比率≤15dl/ mmol; （ii）将所述聚（对苯二甲酸丁二醇酯）低聚物引入低压反应器; 和（iii）通过在235-255℃的温度下使聚（对苯二甲酸丁二醇酯）低聚物经受≥0.05且≤5毫巴的压力，在所述低压反应器中进行缩聚反应达到这种平均停留时间以获得 具有≥18dl/ mmol，优选≥25dl/ mmol的IV:CEG比率并且具有≥0.45dl/ g的IV的聚对苯二甲酸丁二醇酯; 其中步骤（i），（ii）和（iii）以该顺序进行。 这种方法允许使用在给定的IV下具有相对高的CEG的聚（对苯二甲酸丁二醇酯）低聚物来生产具有期望的低CEG的聚（对苯二甲酸丁二醇酯）。 该方法允许使用由使用PTA和1,4-丁二醇的酯化方法获得的聚（对苯二甲酸丁二醇酯）低聚物生产聚（对苯二甲酸丁二醇酯）。

    PROCESS FOR THE PRODUCTION OF POLY(BUTYLENE TEREPHTHALATES)
    9.
    发明公开
    PROCESS FOR THE PRODUCTION OF POLY(BUTYLENE TEREPHTHALATES) 审中-公开

    公开(公告)号：EP3416998A1

    公开(公告)日：2018-12-26

    申请号：EP17700567.5

    申请日：2017-01-19

    申请人： SABIC Global Technologies B.V.

    发明人： KUMAR, Prashant ,  ALIDEDEOGLU, Husnu, Alp

    IPC分类号： C08G63/183 ,  C08G63/78 ,  C08G63/80 ,  C08G63/85

    CPC分类号： C08G63/183 ,  C08G63/78 ,  C08G63/785

    摘要： The present invention relates to a process for the production of poly(butylene terephthalate) comprising the steps of: (i) providing a poly(butylene terephthalate) oligomer having an intrinsic viscosity (IV) of 0.25 - 0.35 dl/g, a carboxylic end group (CEG) content of 25-35 mmol/kg, and a ratio of IV: CEG of ‰¤ 15 dl/mmol; (ii) introducing said poly(butylene terephthalate) oligomer to a low-pressure reactor; and (iii) performing a polycondensation reaction in said low-pressure reactor by subjecting the poly(butylene terephthalate) oligomer to a pressure of ‰¥ 0.05 and ‰¤ 5.0 mbar at a temperature of 235 to 255 °C, for such average residence time to obtain a poly(butylene terephthalate) having a ratio of IV: CEG of ‰¥ 18 dl/mmol, preferably ‰¥ 25 dl/mmol and having an IV of ‰¥ 0.45 dl/g; wherein steps (i), (ii) and (iii) are conducted in that order. Such process allows for the production of poly(butylene terephthalates) having a desired low CEG at given, desired high, IV using a poly(butylene terephthalate) oligomer having a relatively high CEG at given IV. Such process allows for the production of poly(butylene terephthalates) using poly(butylene terephthalate) oligomers obtained from an esterification process using PTA and 1,4-butanediol.