A polybutylene naphthalate polyester and process for preparing polybutylene naphthalate polyester, for improving barrier performance of polyesters used in making of monolayer or multilayer containers. The process comprising: a) mixing butane diol with polymerization catalysts, monoethylene glycol, color toner, and at least one crystallization suppressing agent; b) reacting said mixture with naphthalene dicarboxylic acid or ester thereof to obtain oligomerized product via esterification or ester interchange; c) polymerizing said oligomer using at least one polymerization catalyst to obtain amorphous polybutylene naphthalate polyester chips; d) crystallizing said polybutylene naphthalate polyester chips; and e) subjecting said polyester chips to solid state polymerization to upgrade the intrinsic viscosity (I.V.) up to more than 0.40 dl/gm.
一种聚
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甲酸丁二醇酯聚酯和制备聚
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甲酸丁二醇酯聚酯的工艺,用于改善用于制造单层或多层容器的聚酯的阻隔性能。该工艺包括a) 将
丁二醇与聚合催化剂、单
乙二醇、调色剂和至少一种结晶
抑制剂混合; b) 将所述混合物与
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甲酸或其
酯类反应,通过酯化或酯交换获得低聚物产品;c) 使用至少一种聚合催化剂聚合所述低聚物,以获得无定形聚
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甲酸丁二醇酯聚酯片; d) 结晶所述聚
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甲酸丁二醇酯聚酯片;以及 e) 将所述聚酯片进行固态聚合,以将固有粘度 (I. V.) 提升至 0.0 以上。V.)达到 0.40 分升/克米以上。