Verfahren zur Herstellung von Poly-(aethylenglykolterephthalat)

In the manufacture of polyethylene terephthalate by effecting an ester-interchange reaction between dimethyl terephthalate and ethylene glycol and thereafter polycondensing the product, there is used as a catalyst for the polyesterification reaction an organo-tin compound of formula in which R1 and...

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Bibliographische Detailangaben
Hauptverfasser:	ADVANI RAM, HALMI.. GABOR
Format:	Patent
Sprache:	ger
Schlagworte:	ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC CHEMISTRY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	In the manufacture of polyethylene terephthalate by effecting an ester-interchange reaction between dimethyl terephthalate and ethylene glycol and thereafter polycondensing the product, there is used as a catalyst for the polyesterification reaction an organo-tin compound of formula in which R1 and R2 are alkyl, aryl, alkaryl or cycloalkyl groups and R3 and R4 are the radicals of semi-esters of aliphatic, aromatic or hydroaromatic dicarboxylic acids which are connected to the tin atom through the non-esterified carboxyl groups of the semi-esters. Specified radicals for R3 and R4 are those of maleic, adipic, pimelic or terephthalic acid esterified with C1 to C6 aliphatic alcohols.