| 摘要 |
In a method for producing a homopolyester or copolyester obtainable from at least one cyclic monomer, the at least one cyclic monomer is polymerized in the presence of an initiator. The initiator is selected from organo-tin compounds, tin carboxylates, and tin alkoxides of the oxidation state II or IV that may contain optionally hydroxy groups. At the latest at a point in time when a desired degree of polymerization is reached, a phosphinic acid and/or a phosphinic derivative of the formula (R<SUB>1</SUB>)(R<SUB>2</SUB>)P(-O)X is added, wherein R<SUB>1 </SUB>and R<SUB>2 </SUB>each are independently of one another hydrogen, alkyl, aryl, or hetero aryl, and X is -OR<SUB>3 </SUB>or -NR<SUB>1</SUB>R<SUB>2</SUB>, wherein R<SUB>3 </SUB>is hydrogen, alkyl, aryl, M<SUP>I </SUP>or ½M<SUP>II </SUP>and M<SUP>I </SUP>is an alkali metal ion and M<SUP>II </SUP>is an alkaline earth metal ion and wherein the substituents R<SUB>1 </SUB>and R<SUB>2 </SUB>have the meaning indicated above.
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