Patent ID: 6300462
Filing Date: 2001-10-09
Classification: C08G

Abstract:
A process for producing a poly(ethylene-2,6-naphthalene dicarboxylate), and copolymers thereof, comprisingmixing a component selected from the group consisting of naphthalene-2,6-dicarboxylate ester, in an amount ranging from at least 80 to 100 mole percent, with the remainder comprising naphthalene-2,6-dicarboxylic acid, terephthalic acid, isophthalic acid, dimethylterephthalate, dimethylisophthalate, or mixtures thereof,with a diol component selected from the group consisting of aliphatic diols, cycloaliphatic diols, and mixtures thereof,the poly(ethylene-2,6-naphthalene dicarboxylate) and copolymers thereof having been prepared in the presence of water in an amount ranging from 0.5 to 2.0 weight percent based on the total weight of the component and the diol component,and in the presence of a catalyst system comprising a manganese containing compound in combination with a lithium co-catalyst, and antimony,and in the presence of at least one or more stabilizing compounds containing phosphorus wherein said poly(ethylene-2,6-naphthalene dicarboxylate), and copolymer thereof has less than about 0.8 weight % diethylene glycol content and less than about 20% methyl end-groups.