| abstract |
Disclosed is a polyester polymerization catalyst that provides a polyester molded article having excellent catalytic activity, excellent transparency, little coloration, and little foreign matter generation. The present invention comprises a titanyl oxalate compound and a carboxylic acid containing 1 to 50 carbon atoms and / or a catalytic activity aid selected from lithium, sodium, potassium, magnesium, calcium, strontium, barium and ammonium salts. A polymerization catalyst composition for polyester comprising a titanium polymerization catalyst (A) to be prepared and an aluminum polymerization catalyst (B) comprising an aluminum compound and a phosphorus compound. [Selection figure] None |