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US 2014/0004328 A1Published application
Ultralow Viscosity Liquid Crystalline Polymer Composition
AssigneeTicona LLC
InventorsYoung Shin Kim, Kamlesh P. Nair
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AssigneeTicona LLC
InventorsYoung Shin Kim, Kamlesh P. Nair
Estimating the term…
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.
A thermoplastic composition that comprises a thermotropic liquid crystalline polymer, an aromatic amide oligomer, and a functional compound that includes hydroxyl groups, carboxyl groups, amine groups, or a combination thereof, wherein the thermoplastic composition has a melt viscosity of from about 0.1 to about 80 Pa-s, as determined at a shear rate of 1000 seconds−1 and temperature of 350° C. in accordance with ASTM Test No. 1238-70.
A method for forming a thermoplastic composition within an extruder, the extruder containing at least one rotatable screw within a barrel, wherein the screw has a total length and diameter and wherein a feed section and melt section located downstream from the feed section are defined along the length of the screw, the method comprising:
A method for forming a thermoplastic composition within an extruder, the extruder containing at least one rotatable screw within a barrel, wherein the screw has a total length and diameter and wherein a feed section and melt section located downstream from the feed section are defined along the length of the screw, the method comprising:
Dependencies are inferred from the claim text.