abstract |
The present invention is a process for producing a polyester from a dicarboxylic acid and a diol, which comprises polycondensing the dicarboxylic acid and the diol under the presence of a distannoxane catalyst. Also, the present invention is a process for producing a polyester which comprises melt polycondensing the dicarboxylic acid and the diol under normal pressure in the presence of the distannoxane catalyst, wherein an organic solvent which dose not dissolved any of the dicarboxylic acid, the diol and the polyester produced from the dicarboxylic acid the diol is present and, whereby, two phases are mainly present. |