PREPARATION METHOD FOR POLYETHYLENE NAPHTHALATE POLYMER

摘要

PURPOSE: A method is to provide a polyethylene naphthalene polymer with excellent color and properties while reducing the required time for esterification and polycondensation reactions. CONSTITUTION: A method includes esterifying a dicarboxylic acid or a derivative thereof mainly comprising 2,6-dicarboxylic acid, or a dicarboxylic acid ester or a derivative thereof mainly comprising 2,6-dicarboxylic acid with ethylene glycol or a glycol mainly comprising ethylene glycol, or a derivative thereof, to obtain an ester mainly comprising bis(beta-hydroxyethyl)naphthalate or a lower polymer thereof; and subjecting the ester to polycondensation reaction to obtain the target polyethylene naphthalate polymer. The esterification catalyst used is a mixed catalyst of titanium compound, aromatic phosphite compound and antimony compound.