Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1997-07-09
1998-09-22
Mosley, Terressa
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528272, 528275, 528280, 528281, 528282, 528283, 528284, 528285, 528298, 528308, 528485, 528503, C08G 6378
Patent
active
058115137
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a process for producing polyethylene naphthalate which enables producing polyethylene naphthalate within a time shorter than in the conventional process.
Further, the present invention relates to a liquid mixture of naphthalenedicarboxylic acid esterification reaction products having a low content of naphthalenedicarboxylic acid esters each having diethylene glycol skeleton therein and relates to a process for producing the same.
Still further, the present invention relates to a mixture of naphthalenedicarboxylic acid esterification reaction products having a low content of naphthalenedicarboxylic acid esters each having diethylene glycol skeleton therein, to a process for producing the same and to a process for producing polyethylene naphthalate from this mixture.
BACKGROUND ART
The polyethylene naphthalate is generally produced by reacting naphthalenedicarboxylic acid or its ester derivative (for example, a lower alkyl ester or a phenyl ester) with ethylene glycol or its ester derivative (for example, a monocarboxylic ester ethylene oxide) to thereby obtain a naphthalenedicarboxylic acid/ethylene glycol ester and conducting a polycondensation of this ester in the presence of a polycondensation catalyst. The above esterification reaction is carried out under the reflux of ethylene glycol while removing water or alcohol formed by the reaction outside the reaction system.
However, completing the above esterification reaction takes a prolonged period of time, so that production of polyethylene naphthalate inevitably takes a prolonged period of time. Further, the esterification reaction taking a prolonged period of time may be accompanied by the formation of reaction products which deteriorate, for example, the appearance of obtained polyethylene naphthalate molding. Therefore, accelerating the esterification reaction enables not only shortening the production time for polyethylene naphthalate but also reducing the formation of reaction products which deteriorate the quality of final product, so that its technological value is magnificent.
Reaction of naphthalenedicarboxylic acid with ethylene glycol leads to the formation of esterification reaction products containing carboxyl-hydroxyethoxycarbonylnaphthalene and bis(hydroxyethoxycarbonyl)naphthalene, which reaction products further contain naphthalenedicarboxylic acid esters each having diethylene glycol skeleton (hereinafter may be referred to as "NDA-DEG") in addition to the above components.
This NDA-DEG is likely to deteriorate the quality, for example, the appearance of obtained polyethylene naphthalate. Therefore, obtaining naphthalenedicarboxylic acid esterification reaction products wherein the content of NDA-DEG is low enables improving the quality of polyethylene naphthalate, so that its technological value is magnificent.
The present invention has been made in view of the above prior art. An object of the present invention is to provide a process for producing polyethylene naphthalate which enables producing polyethylene naphthalate within a time shorter than in the conventional process and in which the formation of reaction products likely to deteriorate, for example, the appearance of polyethylene naphthalate molding can be reduced.
Another object of the present invention is to provide a liquid mixture of naphthalenedicarboxylic acid esterification reaction products having a low content of naphthalenedicarboxylic acid esters each having diethylene glycol skeleton therein and to provide a process for producing the same.
A further object of the present invention is to provide a mixture of naphthalenedicarboxylic acid esterification reaction products having a low content of naphthalenedicarboxylic acid esters each having diethylene glycol skeleton therein, to provide a process for producing the same and to provide a process for polyethylene naphthalate from this mixture.
DISCLOSURE OF THE INVENTION
The first process for producing polyethylene naphthalate according to the present invention com
REFERENCES:
patent: 5294695 (1994-03-01), Lee et al.
patent: 5350829 (1994-09-01), Kawamoto
Encyclopedia of Polymer Science and Engineering, vol. 12, pp. 9-36.
Hiraoka Shoji
Inoki Satoshi
Ishibashi Masayasu
Iwasaki Hiroshi
Matsuyoshi Toru
Mitsui Petrochemical Industries Ltd.
Mosley Terressa
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