| abstract |
Catalyst compositions for producing polyesters are obtained by a) reacting orthoesters or condensed orthoesters of titanium, zirconium or aluminum, alcohols comprising two or more hydroxyl groups, 2-hydroxy carboxylic acids and bases. Organometallic compounds; And b) one or more compounds comprising germanium, antimony or tin. The polyesters obtained by the esterification reaction in the presence of the catalyst composition according to the invention exhibit improved melt properties and are particularly suitable for the production of textile and commercial fibers, films and rigid packaging. |