| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester polymerization catalyst excellent in catalytic activity and capable of giving such a polyester as to scarcely cause foreign matter, to be excellent in a color tone and thermal stability, and to give a molded product excellent in transparency, to provide the polyester produced by using the catalyst, and to provide a method for producing the polyester. SOLUTION: This polyester polymerization catalyst comprises at least one kind selected from a group consisting of water-soluble aluminum compounds, wherein the water-soluble aluminum compound comprises a basic aluminum acetate of which the aqueous solution has a transmission at 680 nm of≥97% in a concentration of 2.54 g/l (concentration converted into aluminum element). COPYRIGHT: (C)2006,JPO&NCIPI
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