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    • 2. 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。
    • 7. 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。