| abstract |
An aliphatic polyester with a high polymerization degree having an excellent thermal stability is produced by reacting diol unit(s) and aliphatic dicarboxylic acid unit(s) in the presence of a catalyst comprising a metal oxide containing at least one element from the group consisting of metal elements belonging to the Groups 3 to 6 of the Periodic Table and at least one element selected from the group consisting of a silicon element and a metal element from Groups 1, 2, 12, 13, and 14 of the Periodic Table in an industrially advantageous process. |