Process for forming thermally stable thermotropic liquid crystalline polyesters of predetermined chain length utilizing aliphatic dicarboxylic acid

摘要

An improved polymerization process is provided for the formation of a polyester which is capable of forming an anisotropic melt phase and which optionally may include amide linkages. An approximately 0.25 to 4 percent molar excess of aliphatic dicarboxylic acid monomer containing 4 to 12 carbon atoms (e.g. azelaic acid) and/or an esterified derivative thereof is provided in the polymerization zone during the polymerization reaction. Such monomer imparts dicarboxyaliphatic units to the interior of the resulting polymer chains and causes the polymer chains to terminate in carboxylic acid end groups and/or an esterified derivative thereof wherein the polymer chains achieve a predetermined average chain length through the depletion of other monomers present in the polymerization zone. The resulting polyester unlike the usual product of the prior art is substantially incapable of additional chain growth upon subsequent heating and accordingly may be relied upon to maintain a substantially constant viscosity during melt processing regardless of the duration of heating.