公开(公告)号：US5993963A

公开(公告)日：1999-11-30

申请号：US940780

申请日：1997-09-30

申请人： Yoshihiko Teramoto ,  Tooru Kitagawa ,  Yoshikazu Tanaka ,  Michio Ishitobi

发明人： Yoshihiko Teramoto ,  Tooru Kitagawa ,  Yoshikazu Tanaka ,  Michio Ishitobi

IPC分类号： D01D5/00 ,  D01F6/74 ,  D02G3/00

CPC分类号： D01F6/74 ,  Y10T428/2913 ,  Y10T428/2967

摘要： A polybenzazole fiber characterized by having an elastic modulus of not less than 1350 g/d and requiring not longer than 10 minutes to reduce its water content from 2.0% to 1.5%, when determined using a thermogravimetric analyzer at 110.degree. C. after moisture absorption of not less than 2.0% of a fiber, and a method for manufacturing such a polybenzazole fiber, comprising extruding a spinning dope comprising polybenzazole and a polyphosphoric acid from a spinneret to give a dope filament, and cooling the dope filament to not more than 50.degree. C., followed by coagulation and washing. According to the method of the present invention, a polybenzazole fiber showing less decrease in strength by rapid heating can be provided.

摘要翻译： 一种聚吲哚纤维，其特征在于当吸湿后在110℃下使用热重分析仪测定时，其弹性模量不小于1350g / d，并且需要不超过10分钟以将其含水量从2.0％降低至1.5％ 不小于2.0％的纤维，以及制造这种聚吲哚纤维的方法，包括从喷丝头挤出包含聚吲哚和多磷酸的纺丝原液，得到涂料丝，并将所述涂料丝冷却至不超过50 然后凝固和洗涤。 根据本发明的方法，可以提供通过快速加热显示较少的强度降低的聚吲唑纤维。

公开(公告)号：US5772942A

公开(公告)日：1998-06-30

申请号：US707546

申请日：1996-09-05

申请人： Yoshihiko Teramoto ,  Tooru Kitagawa ,  Michio Ishitobi

发明人： Yoshihiko Teramoto ,  Tooru Kitagawa ,  Michio Ishitobi

IPC分类号： D01F6/74 ,  D01D5/06 ,  D01D10/02 ,  D01D10/06 ,  D01F6/26

CPC分类号： D01F6/74

摘要： The present invention provides processes for producing polybenzazole fibers where a spinning dope containing a polybenzazole polymer in an acid solvent is extruded through a spinning nozzle, followed by coagulation in a coagulating medium and washing with a fluid capable of dissolving the acid solvent; thereafter, in one process, the fiber obtained by the coagulation under specific conditions and the subsequent washing is dried in a heating zone with at least 80% part based on the total length thereof being set at a temperature of 240.degree. C. or higher, and in the other process, the fiber obtained by the coagulation under the conventional conditions and the subsequent washing is neutralized with a basic solution, followed by washing with a fluid capable of dissolving the basic solution, and then dried at a specific temperature set depending upon the residual moisture content in the fiber. The present invention further provides a polybenzazole intermediate predried fiber having a residual moisture content of about 25% and exhibiting a single peak for liquid freezing in the fiber over a temperature range of from 20.degree. to -70.degree. C. when measured by differential scanning calorimetry (DSC).

摘要翻译： 本发明提供生产聚吲哚纤维的方法，其中在酸性溶剂中含有聚吲哚聚合物的纺丝原液通过纺丝喷嘴挤出，然后在凝固介质中凝结，并用能溶解酸溶剂的流体洗涤; 此后，在一个方法中，通过在特定条件下凝结获得的纤维和随后的洗涤在加热区中干燥，至少80％部分基于其总长度设定在240℃或更高的温度， 在另一方法中，将通过常规条件下的凝结获得的纤维和随后的洗涤用碱性溶液中和，然后用能够溶解碱性溶液的流体洗涤，然后在根据 纤维中残留的水分含量。 本发明还提供了当通过差示扫描量热法测量时，在20至-70℃的温度范围内，具有约25％的残余水分含量的聚吲唑中间体预干燥纤维，并且在纤维中显示出液体冷冻的单峰 （DSC）。

公开(公告)号：US6040050A

公开(公告)日：2000-03-21

申请号：US097997

申请日：1998-06-16

申请人： Tooru Kitagawa ,  Michio Ishitobi

发明人： Tooru Kitagawa ,  Michio Ishitobi

IPC分类号： D01F6/74 ,  B02G3/00

CPC分类号： D01F6/74 ,  Y10T428/2913 ,  Y10T428/2967

摘要： A polybenzazole fiber obtained through heat treatment, which has a high tensile modulus of not less than 300 GPa and a tensile strength of not less than 5.0 GPa, said fiber being characterized by an X-ray analysis by a fine structure thereof of at least one of the following (1) and (2):(1) a crystal orientation parameter of not more than 0.009 as determined by a wide-angle X-ray diffraction method,(2) absence of an equatorial streak, a two-point pattern or a four-point pattern in a small-angle X-ray scattering; and a process of manufacturing a polybenzazole fiber which comprises extruding a dope comprising a polybenzazole polymer and a nonoxidative acid capable of dissolving said polymer, from a spinneret into a non coagulative gas to give spun filaments, introducing said filaments into a coagulation bath to extract the acid contained in said filaments, neutralizing the filaments, washing the filaments, adjusting a water content of the filaments to not more than 100%, applying a pretension to the filaments at an optional stage after introduction into a coagulation bath and before heat treatment, and heat treating the filaments at a temperature of not less than 500.degree. C. under a certain tension to give the fiber. The polybenzazole fiber of the present invention has a specific fine structure of fiber, as mentioned above, and also has a high tensile strength and a high tensile modulus heretofore unavailable. The inventive polybenzazole fiber can be manufactured at an industrial scale with ease. Thus, the inventive fiber is tremendously effective in expanding the field of possible utilization as an industrial material with high practical advantages.

摘要翻译： 通过热处理获得的聚吲哚纤维，其具有不低于300GPa的高拉伸模量和不小于5.0GPa的拉伸强度，所述纤维的特征在于通过其至少一种的精细结构的X射线分析 （1）和（2）：（1）通过广角X射线衍射法测定的晶体取向参数不大于0.009，（2）不存在赤道条纹， 小角度X射线散射中的两点图案或四点图案; 以及制造聚吲哚纤维的方法，其包括将包含聚吲哚聚合物和能够溶解所述聚合物的非氧化酸的涂料从喷​​丝头挤出到非凝固性气体中以产生纺丝丝，将所述长丝引入凝固浴中以提取 所述长丝中含有的酸，中和长丝，洗涤长丝，将长丝的水分调节至不超过100％，在引入凝固浴中并在热处理之前的任选阶段向长丝施加预张力，以及 在一定张力下在不低于500℃的温度下热处理长丝，得到纤维。 本发明的聚吲哚纤维如上所述具有特定的纤维结构，并且还具有高拉伸强度和高拉伸模量。 本发明的聚吲哚纤维可以容易地以工业规模制造。 因此，本发明的纤维在扩大作为具有高实用性的工业材料的可能利用领域方面是非常有效的。