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    • 7. 发明授权
    • Process for producing polyethylene naphthalate
    • 生产聚萘二甲酸乙二醇酯的方法
    • US5811513A
    • 1998-09-22
    • US860701
    • 1997-07-09
    • Hiroshi IwasakiMasayasu IshibashiHiromi UekiShoji HiraokaToru MatsuyoshiSatoshi Inoki
    • Hiroshi IwasakiMasayasu IshibashiHiromi UekiShoji HiraokaToru MatsuyoshiSatoshi Inoki
    • C08G63/189C08G63/672C08G63/78C08G63/82
    • C08G63/189C08G63/78C08G63/82
    • In the production of polyethylene naphthalate of the present invention, the esterification reaction between naphthalenedicarboxylic acid and ethylene glycol is conducted while causing water to be present in a reaction system from a start of reaction, in the presence of at least one catalyst selected from the group consisting of nitric, carboxylic, phosphoric and hydrogenphosphoric acid metal salts and alkyl amines according to necessity, to thereby attain an esterification ratio of 45 to 80%, so that a liquid mixture of naphthalenedicarboxylic acid esterification reaction products containing naphthalenedicarboxylic acid, carboxyl-hydroxyethoxycarbonylnaphthalene and bis(hydroxyethoxycarbonyl)naphthalene is obtained. Subsequently, a crystallized reaction product is separated from this liquid mixture to thereby obtain a mixture of esterification reaction products. Thereafter, this mixture having ethylene glycol added thereto according to necessity is subjected to polycondensation. The polyethylene naphthalate obtained by the process of the present application ensures a low content of naphthalenedicarboxylic acid esters each having diethylene glycol skeleton therein, thereby having excellent quality, for example, in appearance.
    • PCT No.PCT / JP96 / 03116 Sec。 371日期1997年7月9日第 102(e)日期1997年7月9日PCT 1996年10月25日PCT公布。 公开号WO97 / 17391 日期1997年5月15日在本发明的聚萘二甲酸乙二醇酯的制造中,在反应开始时,在存在至少一种催化剂的同时,使反应体系中存在水,进行萘二甲酸与乙二醇的酯化反应 根据需要选自硝酸,羧酸,磷酸和氢磷酸金属盐和烷基胺,从而达到45-80%的酯化比,使得含萘二羧酸的萘二甲酸酯化反应产物的液体混合物, 羧基 - 羟基乙氧基羰基萘和双(羟基乙氧基羰基)萘。 随后,从该液体混合物中分离出结晶的反应产物,由此得到酯化反应产物的混合物。 然后,将根据需要添加有乙二醇的混合物进行缩聚。 通过本申请的方法获得的聚萘二甲酸乙二醇酯确保了在其中具有二甘醇骨架的低含量的萘二羧酸酯,从而具有优异的质量,例如外观。
    • 8. 发明授权
    • Method of purifying crude naphthalenedicarboxlic acid and process for
preparing polyethylene naphthalate
    • US6100374A
    • 2000-08-08
    • US254439
    • 1999-03-09
    • Hiroshi IwasakiSatoshi InokiHiromi Ueki
    • Hiroshi IwasakiSatoshi InokiHiromi Ueki
    • C07C51/493C07C67/60C08G63/189C08G63/78C08F6/00
    • C08G63/78C07C51/493C07C67/60C08G63/189
    • The process for preparing polyethylene naphthalate according to the invention is intended to obtain polyethylene naphthalate having a low impurity content from naphthalenedicarboxylic acid containing impurities. This process comprises the steps of: mixing crude naphthalenedicarboxylic acid and an ethylene glycol aqueous solution, heating the resulting mixture to esterify a part of the naphthalenedicarboxylic acid and thereby give a naphthalenedicarboxylic acid ester and dissolving the naphthalenedicarboxylic acid ester in the ethylene glycol aqueous solution; then contacting impurities, which are contained in the crude naphthalenedicarboxylic acid and capable of being hydrogenated, with hydrogen in the presence of a hydrogenation catalyst to hydrogenate the impurities and dissolving the hydrogenated impurities in the ethylene glycol aqueous solution; and subsequently crystallizing the naphthalenedicarboxylic acid ester, separating the resulting crystals from the ethylene glycol aqueous solution and polycondensing the resulting naphthalenedicarboxylic acid ester. The method of purifying crude naphthalenedicarboxylic acid is intended to obtain naphthalenedicarboxylic acid and a naphthalenedicarboxylic acid ester having a low content of aldehydes from naphthalenedicarboxylic acid containing aldehydes. This method comprises the steps of: mixing crude naphthalenedicarboxylic acid and an alcohol aqueous solution, heating the resulting mixture to esterify a part of the naphthalenedicarboxylic acid and thereby give a naphthalenedicarboxylic acid ester and dissolving the naphthalenedicarboxylic acid ester in the alcohol aqueous solution; then contacting aldehydes, which are contained in the crude naphthalenedicarboxylic acid, with a sulfite to give aldehyde adducts and dissolving the aldehyde adducts in the alcohol aqueous solution; and subsequently crystallizing the naphthalenedicarboxylic acid and the naphthalenedicarboxylic acid ester and separating them from the alcohol aqueous solution.