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    Production of polyester fibers of improved stability
    4.
    发明授权
    Production of polyester fibers of improved stability 失效
    生产稳定性好的聚酯纤维

    公开(公告)号：US4374960A

    公开(公告)日：1983-02-22

    申请号：US302908

    申请日：1981-09-16

    申请人： Ronald E. Rothwell ,  Hugh H. Rowan ,  James J. Dunbar

    发明人： Ronald E. Rothwell ,  Hugh H. Rowan ,  James J. Dunbar

    IPC分类号： C08G63/91 ,  C08K5/00 ,  D01F6/92 ,  C08G69/48 ,  C08L77/06

    CPC分类号： D01F6/92 ,  C08G63/916 ,  C08K5/0008

    摘要： There is provided by this invention a process for the production of high molecular weight linear polyethylene terephthalate condensation polyesters which are useful especially for preparing specialty fibers which have excellent resistance to degradation so that they can be used in such commercial articles as paper making machine fabric, industrial belting, etc. The improved high molecular weight linear polyethylene terephthalate condensation polyester specialty fibers are characterized by improved hydrolytic stability and by reduction in the free carboxyl content so as to have a carboxyl concentration of less than about 6 gram equivalents per 10.sup.6 grams of the polyester. These polyester specialty fibers are prepared by the steps of adding an end capping reagent to particles of the said feed polymer, heating to obtain a homogeneous mixture of the said polyester and end capping reagent, mechanically working the polyester melt, and forming filaments of the linear polyester having a reduced free carboxyl content.

    摘要翻译： 本发明提供一种生产高分子量线型聚对苯二甲酸乙二醇酯缩聚物的方法，其特别用于制备具有优异的耐劣化性能的特种纤维，因此可用于造纸机织物等商品中， 工业皮带等。改进的高分子量线性聚对苯二甲酸乙二醇酯缩聚物特种纤维的特征在于改进的水解稳定性和游离羧基含量的降低，使得羧基浓度小于约6克当量/ 106克 聚酯。 这些聚酯特种纤维通过以下步骤制备：将端封试剂加入到所述进料聚合物的颗粒中，加热以获得所述聚酯和封端剂的均匀混合物，机械加工聚酯熔体，并形成线性的长丝 具有降低的游离羧基含量的聚酯。

    Very low creep, ultra high modulus, low shrink, high tenacity polyolefin fiber having good strength retention at high temperatures and method to produce such fiber
    6.
    发明授权
    Very low creep, ultra high modulus, low shrink, high tenacity polyolefin fiber having good strength retention at high temperatures and method to produce such fiber 失效
    非常低的蠕变，超高模量，低收缩，高强度聚烯烃纤维在高温下具有良好的强度保持性和制造这种纤维的方法

    公开(公告)号：US5578374A

    公开(公告)日：1996-11-26

    申请号：US385238

    申请日：1995-02-08

    申请人： James J. Dunbar ,  Sheldon Kavesh ,  Dusan C. Prevorsek ,  Thomas Y. Tam ,  Gene C. Weedon ,  Robert C. Wincklhofer

    发明人： James J. Dunbar ,  Sheldon Kavesh ,  Dusan C. Prevorsek ,  Thomas Y. Tam ,  Gene C. Weedon ,  Robert C. Wincklhofer

    IPC分类号： C08J5/00 ,  C08F8/00 ,  C08F10/00 ,  C08F10/02 ,  D01D5/04 ,  D01F6/04 ,  D01F6/46 ,  D02G3/00

    CPC分类号： D01F6/04 ,  D07B2205/2014 ,  D07B2401/2005 ,  Y10S428/902 ,  Y10T428/2913 ,  Y10T428/2967 ,  Y10T442/30 ,  Y10T442/60

    摘要： By poststretching, at a temperature between about 135.degree. and 160.degree. C., a polyethylene fiber, which has already been oriented by drawing at a temperature within 5.degree. C. of its melting point, an ultra high modulus, very low creep, low shrink, high tenacity polyolefin fiber having good strength retention at high temperatures is obtained. The poststretching can be in multiple stages and/or with previous annealing. The poststretching should be done at a draw rate of less than 1 second.sup.-1. Tensile modulus values over 2,000 g/d for multifilament yarn are consistently obtained for ultrahigh molecular weight-polyethylene, with tensile strength values above 30 g/d while at the same time dramatically improving creep (at 160.degree. F. (71.1.degree. C.) and 39,150 psi load) by values at least 25% lower than fiber which has not been poststretched. Shrinkage is improved to values less than 2.5% of the original length when heated from room temperature to 135.degree. C. Performance at higher temperature is improved by about 15.degree. to 25.degree. C.

    摘要翻译： 通过在约135℃至160℃的温度下拉伸，已经通过在其熔点5℃的温度下拉伸定向的聚乙烯纤维，超高模量，非常低的蠕变，低 获得在高温下具有良好强度保持性的收缩，强韧性聚烯烃纤维。 后拉伸可以在多个阶段和/或先前的退火中。 延期工作应以小于1秒-1的抽签率进行。 对于超高分子量聚乙烯，拉伸强度值高于30g / d，同时显着改善蠕变（在160°F（71.1℃））下，针对复丝纱线的拉伸模量值超过2,000g / d。 和39,150磅/平方英寸负载），比尚未拉伸的纤维低至少25％。 当从室温加热到135℃时，收缩率提高到小于原始长度的2.5％的值。在较高温度下的性能提高约15至25℃。