Polycondensation catalyst for polyester production and polyester production using polycondensation catalyst for polyester production

摘要

A polycondensation catalyst to produce polyester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or an ester-forming derivative thereof and a glycol, wherein the polycondensation catalyst comprises particles of a solid base having on them surfaces an inner coating layer of titanic acid in an amount of 0.1 to 50 parts by weight in terms of TiO2 per 100 parts by weight of the solid base, and an outer coating layer of an oxide of at least one selected element between aluminum, zirconium and silicon, or of an oxide composed of at least two elements selected from aluminum, zirconium and silicon on the surface of the inner coating layer in an amount of 1 to 50 parts by weight per 100 parts by weight of the solid base, where titanic acid is a hydrated titanium oxide represented by the general formula TiO2 · nH2O where n is a number that satisfies 0 n = 2.