Process for Preparing Polyethylenenaphthalate with 2,6-Naphthalenedicarboxylic Acid
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United States of America Patent
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Issued Date -
Sep 30, 2010
app pub date -
Oct 30, 2008
filing date -
Nov 30, 2007
priority date (Note) -
Abandoned
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Abstract
The present invention relates to a process for preparing polyethylene naphthalate, comprising the steps of: esterifying 2,6-naphthalene dicarboxylic acid and ethylene glycol, or glycols using the two materials as major material to obtain prepolymer which comprises bis(beta-hydroxyethyl)naphthalate or low polymer as main material; and performing polycondensation reaction to thereby prepare polyethylene naphthalate. The process of the present invention has advantages of: enabling esterification with a low molar ratio of ethylene glycol to reduce reaction time, thereby increasing process efficiency; minimizing formation of side reaction products to improve properties; and preventing deterioration of the products by performing polycondensation at a low temperature to thereby obtain polyethylene naphthalate polymers of high quality.
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