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    • 1. 发明申请
    • METHOD FOR MINIMIZING PROCESS DISRUPTIONS DURING FORMATION OF A LIQUID CRYSTALLINE POLYMER
    • 在形成液晶聚合物过程中最小化工艺破坏的方法
    • WO2013032978A1
    • 2013-03-07
    • PCT/US2012/052443
    • 2012-08-27
    • TICONA LLCNAIR, Kamlesh, P.GRAY, Steven, D.
    • NAIR, Kamlesh, P.GRAY, Steven, D.
    • C08K5/20C09K19/22C09K19/30C09K19/32C09K19/34C09K19/48
    • C09K19/22C08K5/20C09K19/3086C09K19/322C09K19/3444C09K19/48C09K2019/0481C08L67/03
    • A method for lowering melt viscosity of a liquid crystalline polymer as it is formed in a reactor vessel. More particularly, a reaction mixture is initially supplied to the reactor vessel that contains two or more precursor monomers (e.g., acetylated or non-acetylated). The reaction mixture is heated to an elevated temperature under agitation to initiate formation of the polymer. After a certain period of time, an aromatic amide oligomer is added to the reaction mixture. Among other things, the present inventors have discovered that such an oligomer can serve as a flow aid by altering intermolecular polymer chain interactions, thereby lowering the overall viscosity of the polymer matrix under shear. This minimizes the likelihood of "freeze off" of the polymer within the reactor vessel and limits the impact of process disruptions on the production of the liquid crystalline polymer. Another benefit of the oligomer is that it is not easily volatized or decomposed. This allows the oligomer to be added to the reaction mixture while it is still at relatively high temperatures. While providing the benefits noted, the aromatic amide oligomer does not generally react with the polymer backbone of the liquid crystalline polymer to any appreciable extent so that the mechanical properties of the polymer are not adversely impacted.
    • 液晶聚合物在反应器容器中形成时的熔融粘度降低的方法。 更具体地,反应混合物最初被供应到含有两种或更多种前体单体(例如乙酰化或非乙酰化)的反应器容器中。 在搅拌下将反应混合物加热至高温以引发聚合物的形成。 经过一段时间后,向反应混合物中加入芳香族酰胺低聚物。 其中,本发明人发现,通过改变分子间聚合物链的相互作用,这样的低聚物可以作为流动助剂,从而降低聚合物基体在剪切下的总粘度。 这使得反应器容器内的聚合物“冻结”的可能性最小化,并限制了工艺中断对液晶聚合物生产的影响。 低聚物的另一个好处是它不容易挥发或分解。 这使得当反应混合物仍处于相对高的温度下时,可将其加入反应混合物中。 在提供所提及的优点的同时,芳族酰胺低聚物通常不会与液晶聚合物的聚合物主链反应任何明显的程度,使得聚合物的机械性能不会受到不利影响。
    • 5. 发明申请
    • SOLID-STATE POLYMERIZATION OF A LIQUID CRYSTALLINE POLYMER
    • 液晶聚合物的固态聚合
    • WO2013032974A1
    • 2013-03-07
    • PCT/US2012/052437
    • 2012-08-27
    • TICONA LLCNAIR, Kamlesh P.GRAY, Steven D.
    • NAIR, Kamlesh P.GRAY, Steven D.
    • C08K5/20C09K19/22C09K19/30C09K19/32C09K19/34C09K19/48
    • C09K19/22C08K5/20C09K19/3086C09K19/322C09K19/3444C09K19/48C09K2019/0481
    • A method for forming a high molecular weight thermotropic liquid crystalline polymer is provided. The method includes melt polymerizing two or more monomers in the presence of a unique aromatic amide oligomer to form a prepolymer, and then solid-state polymerizing the prepolymer to achieve a target molecular weight. The present inventors have discovered that a unique aromatic amide oligomer can be employed to help increase the "low shear" complex viscosity of the resulting solid-state polymerized composition. This allows for the attainment of higher than conventional "low shear" complex viscosity values and/or a substantial reduction in the solid-state polymerization time needed to achieve a target complex viscosity. In addition, the oligomeric flow aid can also accelerate the extent to which the "high shear" melt viscosity is increased during solid-state polymerization, which may also contribute to a substantial reduction in the solid-state polymerization time needed to achieve a certain molecular weight.
    • 提供了形成高分子量热致液晶聚合物的方法。 该方法包括在独特的芳族酰胺低聚物存在下熔融聚合两种或更多种单体以形成预聚物,然后使预聚物固相聚合以达到目标分子量。 本发明人已经发现,可以使用独特的芳族酰胺低聚物来帮助提高所得固态聚合组合物的“低剪切”复数粘度。 这允许达到高于常规“低剪切”复数粘度值和/或实现目标复合物粘度所需的固态聚合时间的显着降低。 此外,低聚流动助剂还可以加速在固态聚合期间“高剪切”熔体粘度增加的程度,这也可能导致实现某种分子所需的固态聚合时间的显着降低 重量。
    • 7. 发明申请
    • CAST MOLDED PARTS FORMED FORM A LIQUID CRYSTALLINE POLYMER
    • CAST模制部件形成液晶聚合物
    • WO2013032967A1
    • 2013-03-07
    • PCT/US2012/052429
    • 2012-08-27
    • TICONA LLCNAIR, Kamlesh, P.GRAY, Steven, D.GRENCI, Joseph, J.
    • NAIR, Kamlesh, P.GRAY, Steven, D.GRENCI, Joseph, J.
    • C09K19/22C09K19/30C09K19/32C09K19/34C09K19/48C08K5/20
    • C09K19/54B29C39/006C08K5/20C08K5/34922C08L77/12C09K19/22C09K19/3086C09K19/322C09K19/3444C09K19/48C09K2019/0481
    • A molded part having a predetermined shape is provided. The molded part may be formed by casting a liquid crystalline polymer composition into a mold cavity at a relatively low shear rate. Due to the use of a relatively low shear rate, the polymer composition does not generally undergo extensive shear orientation, which can allow the resulting part to be further processed using standard finishing techniques. Low shear casting can also inhibit shear-induced molecular alignment, which can translate into a part having generally isotropic mechanical properties. The ability to use relatively low shear rates during casting is achieved in the present invention through the use of an aromatic amide oligomer. More particularly, the present inventors have discovered that the aromatic amide oligomer can serve as a flow aid by altering intermolecular polymer chain interactions, thereby lowering the overall viscosity of the polymer matrix to "ultralow" levels without having a significant impact on the mechanical properties. Among other things, such an ultralow viscosity can allow the composition to more readily flow into the cavity of a mold without requiring an extensive amount of shear.
    • 提供具有预定形状的模制件。 模制部件可以通过将液晶聚合物组合物以相对低的剪切速率浇铸到模腔中而形成。 由于使用相对低的剪切速率,聚合物组合物通常不经受广泛的剪切取向,这可以允许使用标准精整技术进一步处理所得到的部分。 低剪切铸造也可以抑制剪切诱导的分子对准,其可以转化为具有大体各向同性机械性能的部分。 在本发明中通过使用芳族酰胺低聚物实现了在铸造过程中使用相对低的剪切速率的能力。 更具体地,本发明人已经发现,通过改变分子间聚合物链相互作用,芳族酰胺低聚物可以用作流动助剂,从而将聚合物基质的总体粘度降低到“超低”水平,而对机械性能没有显着的影响。 除此之外,这种超低粘度可以允许组合物更容易地流入模具的空腔中,而不需要大量的剪切。
    • 8. 发明申请
    • ULTRALOW VISCOSITY LIQUID CRYSTALLINE POLYMER COMPOSITION
    • 超粘度液晶聚合物组合物
    • WO2014003813A1
    • 2014-01-03
    • PCT/US2012/064748
    • 2012-11-13
    • TICONA LLC
    • KIM, Young, ShinNAIR, Kamlesh, P.
    • C09K19/22C09K19/30C09K19/32C09K19/34C09K19/38C09K19/48C08G69/44C08L77/12
    • C09K19/54B29C47/38C08G69/32C08L67/04C08L77/12C09K19/22C09K19/3086C09K19/322C09K19/3444C09K19/3809C09K19/48C09K2019/0481C08L77/10C08K7/14C08K5/13C08K3/22
    • A thermoplastic composition that comprises a thermotropic, liquid crystalline polymer and a combination of certain types of flow modifiers is provided. More particularly, one type of flow modifier that is employed in the composition is a functional compound (e.g., hydroxy-functional, carboxy-functional, etc.) that can react with the backbone of the polymer. In certain cases, for instance, the functional compound can initiate chain scission of the polymer, which reduces the molecular weight, and in turn, the melt viscosity of the polymer under shear. An additional non-functional compound is also employed to help reduce the melt viscosity to the desired "ultralow" levels without having a significant impact on the mechanical properties. The non-functional compound is, more specifically, an aromatic amide oligomer that can alter intermolecular polymer chain interactions without inducing chain scission to any appreciable extent, thereby further lowering the overall viscosity of the polymer matrix under shear.
    • 提供了包含热致液晶聚合物和某些类型的流动改性剂的组合的热塑性组合物。 更具体地,在组合物中使用的一种类型的流动改性剂是可以与聚合物的主链反应的官能化合物(例如羟基官能的,羧基官能的等)。 在某些情况下,例如,官能化合物可以引发聚合物的链断裂,其降低分子量,进而降低剪切下聚合物的熔体粘度。 还使用另外的非官能化合物来帮助将熔体粘度降低到所需的“超低”水平,而不会对机械性能产生显着的影响。 更具体而言,非官能化合物是可以改变分子间聚合物链相互作用而不引起链断裂至任何明显程度的芳族酰胺低聚物,从而进一步降低剪切下聚合物基质的总粘度。
    • 10. 发明申请
    • THERMOTROPIC LIQUID CRYSTALLINE POLYMER WITH IMPROVED LOW SHEAR VISCOSITY
    • 具有改善低剪切粘度的热成型液晶聚合物
    • WO2013032975A1
    • 2013-03-07
    • PCT/US2012/052438
    • 2012-08-27
    • TICONA LLCNAIR, Kamlesh, P.GRAY, Steven, D.
    • NAIR, Kamlesh, P.GRAY, Steven, D.
    • C08G69/44C08L77/12C09K19/22C09K19/30C09K19/32C09K19/34C09K19/38C09K19/48
    • C09K19/22C08L77/12C09K19/3086C09K19/322C09K19/3444C09K19/3809C09K19/48C09K2019/0481C08L77/10
    • A thermotropic liquid crystalline polymer melt polymerized in the presence of a viscosity modifier that can help increase the "low shear" viscosity of the resulting composition is provided. The increased "low shear" viscosity can minimize drooling of the polymer composition during processing and also allow it to possess a greater melt strength, which facilitates its ability to be processed in a wide variety of applications without losing its physical integrity. Despite having a relatively high "low shear" viscosity, the present inventors have discovered that the viscosity modifier does not substantially increase the "high shear" melt viscosity of the polymer composition. In this regard, the ratio of the "low shear" viscosity to the melt viscosity is generally very high, such as within a range of from about 50 to about 1000, in some embodiments from about 100 to about 800, and in some embodiments, from about 150 to about 500, wherein the low shear viscosity is determined at an angular frequency of 0.15 radians per second, a temperature of 350°C, and at a constant strain amplitude of 1%, and the melt viscosity is determined at a temperature of 350°C and shear rate of 1000 seconds-1.
    • 提供了在粘度调节剂存在下熔融聚合的热致液晶聚合物,其可以帮助提高所得组合物的“低剪切”粘度。 增加的“低剪切”粘度可以最小化加工过程中聚合物组合物的流失,并且还允许其具有更大的熔体强度,这有助于其在各种应用中被处理的能力而不损失其物理完整性。 尽管具有相对高的“低剪切”粘度,但是本发明人已经发现,粘度调节剂基本上不增加聚合物组合物的“高剪切”熔体粘度。 在这方面,“低剪切”粘度与熔体粘度的比例通常非常高,例如在约50至约1000的范围内,在一些实施方案中为约100至约800,在一些实施方案中, 约150至约500,其中低剪切粘度以0.15弧度/秒的角频率,350℃的温度和1%的恒定应变幅度确定,并且熔体粘度在温度 350℃,剪切速率1000秒-1。