Method for producing melt-stable homo- and copolyesters of cyclic esters and/or diesters
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United States of America Patent
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Issued Date -
Jul 28, 2005
app pub date -
Mar 15, 2005
filing date -
Apr 16, 2002
priority date (Note) -
Abandoned
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Abstract
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)(R.sub.2)P(.dbd.O)X is added, wherein R.sub.1 and R.sub.2 each are independently of one another hydrogen, alkyl, aryl, or hetero aryl, and X is --OR.sub.3 or --NR.sub.1R.sub.2, wherein R.sub.3 is hydrogen, alkyl, aryl, M.sup.I or 1/2M.sup.II and M.sup.I is an alkali metal ion and M.sup.II is an alkaline earth metal ion and wherein the substituents R.sub.1 and R.sub.2 have the meaning indicated above.
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