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Process for forming thermally stable thermotropic liquid crystalline polyesters of predetermining chain length utilizing aromatic hydroxyl monomer and/or aromatic amine monomer
Process for forming thermally stable thermotropic liquid crystalline polyesters of predetermining chain length utilizing aromatic hydroxyl monomer and/or aromatic amine monomer
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机译:利用芳族羟基单体和/或芳族胺单体形成预定链长的热稳定的热致液晶聚酯的方法
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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 aromatic hydroxyl monomer and/or aromatic amine monomer and/or an esterified and/or amidated derivative thereof is provided in the polymerization zone during the polymerization reaction. Such monomer imparts dioxyaryl, diaminoaryl, or oxyaminoaryl units to the interior of the resulting polymer chains and causes the polymer chains to terminate in hydroxyl end groups and/or in esterified derivative thereof and/or amino end groups and/or an amidated 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.
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