Patent ID: 7332564
Filing Date: 2008-02-19
Classification: C08G

Abstract:
1. A polymerization catalyst for the preparation of a polyester, comprising: combined catalyst components comprising at least metal elements (1) and (2); wherein: metal element (1) is at least one metal element selected from the group consisting of metal elements of Group 4B of the Periodic Table; metal element (2) is at least one metal element selected from the group consisting of metal elements of Group 2A of the Periodic Table, aluminum, manganese, iron, cobalt, zinc, gallium and germanium; when a total amount of metal atoms derived from metal element (1) is represented by t (mol/catalyst kg), and a total amount of metal atoms derived from metal element (2) is represented by m (mol/catalyst kg), a value of m/t is given by: 0.50<m/t<3.50; the catalyst is a liquid; and the liquid exhibits a turbidity of at most 20% in a light path length of 10 mm.