METHOD FOR PRODUCING MELT-STABLE HOMO- AND COPOLYESTERS OF CYCLIC ESTERS AND/OR DIESTERS

• Main Authors: BECHTHOLD, INNA, RIECKERT, HORST, RAFLER, GERALD
• Format: Patent
• Language: English; French; German
• Published: 12.01.2005
• Edition: 7
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

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 (R1)(R2)P(-O)X is added, wherein R1 and R2 each are independently of one another hydrogen, alkyl, aryl, or hetero aryl, and X is -OR3 or -NR1R2, wherein R3 is hydrogen, alkyl, aryl, MI or ½MII and MI is an alkali metal ion and MII is an alkaline earth metal ion and wherein the substituents R1 and R2 have the meaning indicated above.