Patent ID: 9074047
Filing Date: 2015-07-07
Classification: B01J,C08G

Abstract:
1. A method for producing a catalyst for producing polyester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or an ester-forming derivative thereof and a glycol, the method comprising: (a) preparing a dispersion of particles of a solid base of magnesium hydroxide or hydrotalcite in an aliphatic dihydric alcohol, (b) adding an organic titanium compound dropwise to the dispersion and then stirring, (c) aging the dispersion, and (d) hydrolyzing the organic titanium compound by adding water to the dispersion in an amount of at least four times, in terms of moles, per the amount of the organic titanium compound to form a coat layer of titanic acid on a surface of the particles of the solid base to obtain the catalyst, wherein the method for producing the catalyst excludes use of an aliphatic monohydric alcohol.