Catalyst for making polyesters, its preparation and use

摘要

Catalyst (A) for preparation of linear polyesters (I) by transesterification or esterification and polycondensation of polyvalent alcohols (II) and polyvalent carboxylic acids (III), includes a carrier that forms a heterologous phase. The carrier consists of very finely divided particles with a porous structure and high internal surface area that includes reactive and/or coordinative sites. Catalytically active metal compounds (IV) are adsorbed within the pores. Independent claims are also included for the following: (a) method for preparing (A); and (b) method for preparing (I) using (A) at catalyst concentration (expressed as metal content) of 0.1-100 ppm, relative to polyester.