Patent ID: 8609802
Filing Date: 2013-12-17
Classification: C08G,C09K

Abstract:
1. A method of preparing wholly aromatic liquid crystalline polyester resin, the method comprising: synthesizing a wholly aromatic liquid crystalline polyester prepolymer by condensation polymerization of at least two different monomers; and reducing an internal pressure of a reaction vessel containing the prepolymer to remove a byproduct and unreacted monomers and lead to condensation polymerization of the prepolymer, thereby synthesizing the wholly aromatic liquid crystalline polyester resin, wherein an internal pressure reduction rate of the reaction vessel is in a range of about 17 torr/min to about 20 torr/min, wherein the reaction vessel is equipped with an agitator, and a time for which the reduced internal pressure of the reaction vessel is maintained is controlled based on a torque value of the agitator, wherein the reduced internal pressure state of the reaction vessel is released when the torque value of the agitator reaches about 5 N·m to about 6N·m.