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    • 63. 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。