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PREPARATION OF POLY(ETHYLENE-2,6-NAPHTHALENE DICARBOXYLATE) FROM DIMETHYL-2,6-NAPHTHALENE DICARBOXYLATE AND METHYL HYDROGEN 2,6-NAPHTHALENE DICARBOXYLATE
PREPARATION OF POLY(ETHYLENE-2,6-NAPHTHALENE DICARBOXYLATE) FROM DIMETHYL-2,6-NAPHTHALENE DICARBOXYLATE AND METHYL HYDROGEN 2,6-NAPHTHALENE DICARBOXYLATE
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机译:由二甲基-2,6-萘二甲酸酯和甲基氢2,6-萘二甲酸甲酯制备聚乙烯(2,6-萘二甲酸酯)
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摘要
This invention relates to a method of preparing poly(ethylene-2,6-naphthalene dicarboxylate) by the polycondensation reaction of ethylene glycol and dimethyl-2,6-naphthalene dicarboxylate, using a dimethyl-2,6-naphthalene dicarboxylate starting material which contains significant amounts of methyl hydrogen 2,6-naphthalene dicarboxylate as a contaminant. The methyl hydrogen 2,6-naphthalene dicarboxylate moiety is incorporated into the polymer structure by initially esterifying the methyl hydrogen 2,6-naphthalene dicarboxylate acid end-group with ethylene carbonate, in the presence of an amine or ammonium catalyst, before the polyesterification/polycondensation reaction is performed.
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