THERMOTROPIC LIQUID CRYSTALLINE POLYMER WITH IMPROVED LOW SHEAR VISCOSITY

摘要

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.