Method for the preparation of polyalkylene terephthalate resin compositions employing titanium-containing catalyst complex

摘要

A process of preparing a polyalkylene terephthalate comprising reacting an alkylene diol and an aromatic dicarboxy compound that is an aromatic dicarboxylic acid, aromatic dicarboxylic (C1-C3)alkyl ester, or a combination thereof, wherein ester interchange and polymerization occurs in the presence of a catalyst complex formed by the reaction of tetraisopropyl titanate and a boron, phosphorous or nitrogen-containing complexing agent, which catalyst can be synthesized in situ prior to ester interchange and introduced to a mixture of the alkylene diol and the aromatic dicarboxy compound prior to ester interchange.

主权项

1. A process of preparing a polyalkylene terephthalate comprising reacting an alkylene diol and a dicarboxy aromatic compound selected from the group consisting of aromatic dicarboxylic acids, aromatic dicarboxylic (C1-C3)alkyl esters, and combinations thereof, wherein the process comprises:
forming a catalyst that consists of the reaction product of tetra(C1-C8 alkyl) titanate and phosphoric acid; obtaining ester interchange by combining the catalyst with the alkylene diol and the aromatic dicarboxy compound; and polymerizing the product of ester interchange, in the continued presence of the catalyst, yielding polyalkylene terephthalate; wherein the polyalkylene terephthalate excludes adipic acid groups.