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A method for the production of poly (1,4 - cyclo hexylene represent dimethylene - 1,4 - cyclo hexane dicarboxylate) and the reactor quality polyester
A method for the production of poly (1,4 - cyclo hexylene represent dimethylene - 1,4 - cyclo hexane dicarboxylate) and the reactor quality polyester
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机译:聚(1,4-环己烯代表二亚甲基-1,4-环己烷二羧酸酯)和反应器级聚酯的生产方法
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摘要
In a process for producing a reactor grade polyester, a poly(1,4-cyclohexylenedimethylene 1,4-cyclohexanedicarboxylate) has a reduced amount of isomerization of the trans-isomer to the cis-isomer of 1,4-dimethylcyclohexanedicarboxylate and an increased polymerization rate by the addition of a phosphorus-containing compound to the reaction process. In step (a) of the process, a diacid comprising at least 80 mole percent 1,4-cyclohexanedicarboxylic acid or an ester derivative of the diacid comprising at least 80 mole percent 1,4-dimethylcyclohexanedicarboxylate is reacted with a glycol comprising at least 80 mole percent 1,4-cyclohexanedimethanol at a temperature sufficient to effect esterification for the diacid or transesterification for the ester derivative. In step (b), the product of step (a) is subjected to temperature and pressures in the presence of a suitable catalyst to effect polycondensation. Phosphorus in an amount of 1 to 800 ppm is added in the form of a phosphorus-containing compound during the process.
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