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    Polyester production
    1.
    发明授权
    Polyester production 失效
    涤纶生产

    公开(公告)号：US4133800A

    公开(公告)日：1979-01-09

    申请号：US742000

    申请日：1976-11-15

    申请人： Robert P. L. V. Taubinger ,  Robert B. Rashbrook

    发明人： Robert P. L. V. Taubinger ,  Robert B. Rashbrook

    IPC分类号： C08G63/83 ,  C08G63/86 ,  C08G63/36

    CPC分类号： C08G63/83 ,  C08G63/86

    摘要： Polyesters, e.g. polyethylene terephthalate, are produced by a direct esterification process. The esterification is performed in the presence of a germanium dioxide polycondensation catalyst dissolved in an alkaline ethylene glycol solution. The alkali in the catalyst solution acts as the softening point stabilizer. An antimony polycondensation catalyst is also employed.

    摘要翻译： 聚酯，例如 聚对苯二甲酸乙二醇酯通过直接酯化方法制备。 酯化反应在溶解在碱性乙二醇溶液中的二氧化锗缩聚催化剂存在下进行。 催化剂溶液中的碱作为软化点稳定剂。 还使用锑缩聚催化剂。

    Method for production of high molecular weight polyester with low catalyst level and low carboxyl content
    2.
    发明授权
    Method for production of high molecular weight polyester with low catalyst level and low carboxyl content 失效
    低催化剂水平和低羧基含量的高分子量聚酯的生产方法

    公开(公告)号：US4205157A

    公开(公告)日：1980-05-27

    申请号：US25697

    申请日：1979-04-02

    申请人： Ben Duh

    发明人： Ben Duh

    IPC分类号： C08G63/00 ,  C08G63/18 ,  C08G63/78 ,  C08G63/80 ,  C08G63/36

    CPC分类号： C08G63/18 ,  C08G63/80

    摘要： A high molecular weight polyester is disclosed, having a low carboxyl content, and utilizing a low catalyst level, produced by a two-stage process; a melt process until the intrinsic viscosity of the prepolymer reaches about between 0.15 and 0.45 dl/g, and a solid state polymerization in a fluidized bed until the intrinsic viscosity of the polycondensed polymer reaches at least 0.60 dl/g. The melt process employs addition of excess initial glycol, delayed addition of excess glycol, and delayed addition of catalyst, in any combination, to achieve a low carboxyl content polyester prepolymer capable of use in the fluidized bed solid state polymerization. This prepolymer with a minimal carboxyl content achieves a maximum solid state polymerization rate in a fluidized bed. This prepolymer also permits the use of a very low catalyst level to achieve high product purity and still maintains economically satisfactory polymerization rate. Stability and color clarity of the polycondensed product is obtained by this method.

    摘要翻译： 公开了一种高分子量聚酯，其具有低羧基含量，并且利用通过两阶段方法生产的低催化剂水平; 直到预聚物的特性粘度达到约0.15至0.45dl / g之间的熔融过程，并且在流化床中的固态聚合直到聚缩聚聚合物的特性粘度达到至少0.60dl / g。 熔融法通过加入过量的初始乙二醇，延迟加入过量的二醇，并以任意组合延迟加入催化剂，以实现能够用于流化床固态聚合的低羧基聚酯预聚物。 具有最小羧基含量的该预聚物在流化床中达到最大的固态聚合速率。 该预聚物还允许使用非常低的催化剂水平以获得高产品纯度并且仍然保持经济上令人满意的聚合速率。 通过该方法获得聚缩合产物的稳定性和颜色透明度。