DE1495777C - Process for the production of linear high molecular weight polyesters - Google Patents

Claims (1)

1 2 Connections are shortened compared to the known ones Claim: Catalysts for the polycondensation to spinnable polyester necessary reaction times. Process for the production of linear high- Mostly a one-hour polycondensation is sufficient molecular polyesters by transesterification and 5 280 ° C and 0.1 mm to make spinnable polyester, the Polycondensation of dimethyl terephthalic acid to obtain threads with high strength, ester with ethylene glycol in the presence of poly- Although the use of antimony triphenyl condensation catalysts, the antimony triphenyl as well as the use of germanium dioxide contained in the melt, thus known as a catalyst, however, the excess indicates that a polycondensation is surprising, synergistic. Effect of a mixture of Sationskatalysatoren a mixture of approximately the same approximately equal amounts of both components still Amounts of antimony triphenyl with germanium dioxide have not become known, or used with zinc acetylacetonate. The method of the invention provides white or colorless polycondensates of high viscosity. 15 The catalysts are used in amounts from 0.01 to 0.3 percent by weight, based on the sum of the . Solids, used. For the transesterification one uses a well-known It is known in the production of polyesters, way lithium hydride, calcium acetate, lithium-m-brate such as polyethylene terephthalate, transesterification and 20 and lithium acetate. Polycondensation can be influenced by catalysts
rivers. Mostly serve as transesterification catalysts Zinc acetate or calcium acetate, also lithium hydride, 40 parts of lithium m-borate and lithium acetate are used in a rotary evaporator. It is also known dimethyl terephthalate and 44 parts by volume, antimony triphenyl or 25 ethylene glycol with 0.01 part lithium hydride in a manium dioxide as polycondensation catalysts. Melted nitrogen atmosphere and used for 75 minutes. to a temperature of 150 ° C and 75 minutes, it was heated to a process for the production of a temperature of 180 ⁰ C then, with 15 Volumlinearen high molecular weight polyesters are developed by environmental parts of methanol. The excess esterification and polycondensation of terephthalic acid glycol is removed in a water jet vacuum at 130 ° C. with entdimethyl ester with ethylene glycol in the presence of and polycondensation catalysts to the glycol terephthalate formed in this way, which contain antimony triphenyl, a mixture of antimony triphenyl and germanium nyl, are found in the melt thereby added dioxide 1: 1 (0.1 percent by weight), which is characterized in that the polycondensation pressure within 30 minutes to 0.1 mm Hg catalyzes a mixture of approximately equal amounts and the temperature is reduced to 270 to 280 ° C increased. Antimony triphenyl with germanium dioxide or with will. After 3 hours of polycondensation, zinc acetylacetonate is used. a white polymer with a melting point of 260.degree. C. The use of this synergistic effect and a relative viscosity »jrel = 1.84.