Patent ID: 6040417
Filing Date: 2000-03-21
Classification: C08G

Abstract:
A process for preparing polyethylene naphthalate polymers comprising the steps of:(a) esterifying a dicarboxylic acid containing 2,6-NDCA, dicarboxylic ester containing 2,6-NDC or derivatives thereof and ethylene glycol or glycol containing ethylene glycol to produce esterification polymers containing bis(beta-hydroxyethyl)naphthalate;(b) polycondensing continuously the resultant esterification polymers of step (a) to produce polymers of polyethylene naphthalate; and,wherein the above process includes using a composite polymerization catalyst comprising at least one compound of titanium and at least one compound of aromatic phosphite, and the titanium compound represented by formulas I or II:(RO).sub.4 Ti, Formula I(RO).sub.4 Ti.2XP(O)(OR').sub.2 Formula IIR and R' are the same or different and are selected from the group consisting of a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, an n-amyl group, an acetylisopropyl group, a pentyl group, a hexyl group, a heptyl group, a 2-ethylhexyl group, an octyl group, a decyl group, a dodecyl group, a tridecyl group, an octadecyl group, a stearyl group, an allyl group, a 2,2-diallyloxymethylbutyl group, a cyclopentyl group, a cyclohexyl group, a naphthyl group, a phenyl group, a benzyl group, and a dodecylbenzyl group, and X represents a hydrogen group, a halogen group, an alkyl group, an alkoxy group or an aryloxy group.