POLYCONDENSATION CATALYST FOR POLYESTER PRODUCTION AND PRODUCTION OF POLYESTER USING POLYCONDENSATION CATALYST FOR POLYESTER PRODUCTION

摘要

2The present invention provides a polycondensation catalyst for polyester production by means of an esterification reaction or transesterification reaction of a glycol and a dicarboxylic acid or an ester forming derivative of a dicarboxylic acid. This polycondensation catalyst is composed of solid base particles each of which has an inner coating layer that is formed of titanic acid on the surface of a particle of a solid base in an amount of 0.1 50 parts by weight in terms of TiO per 100 parts by weight of the solid base and each of which has an outer coating layer that is formed of an oxide of at least one element that is selected from among aluminum zirconium and silicon or a complex oxide of at least two elements that are selected from among aluminum zirconium and silicon on the surface of the inner coating layer in an amount of 1 50 parts by weight.