EnglishThe catalyst compn., an improved method of prepn. of a polyester on the two-stage process of ester interchange and polycondensation, comprises the combination of (a) a titanium-based compd. or zirconium-based compd. and (b) a lanthanide series compd. or hafnium, and optionally, a phosphate-forming compd. Thus, poly(butylene terephthalate) was prepd. by a two-stage polymn. of 1,4-butanediol and di-Me terephthalate in an ester interchange reaction process in the presence of 0.08 phr titanium tetrabutoxide and in a polycondensation stage of 0.14 phr hafnium tetrakis(acetylacetonate).
| Data di concessione: | 1999 |
| Titolo: | Catalyst composition for the preparation of polyesters, and related processes |
| Inventore del brevetto: | BANACH T E; PILATI F.; COLONNA M.; FIORINI M.; BERTI C.; TOSELLI M.; M. MESSORI; MARIANUCCI E. |
| Autori: | |
| Abstract: | The catalyst compn., an improved method of prepn. of a polyester on the two-stage process of ester interchange and polycondensation, comprises the combination of (a) a titanium-based compd. or zirconium-based compd. and (b) a lanthanide series compd. or hafnium, and optionally, a phosphate-forming compd. Thus, poly(butylene terephthalate) was prepd. by a two-stage polymn. of 1,4-butanediol and di-Me terephthalate in an ester interchange reaction process in the presence of 0.08 phr titanium tetrabutoxide and in a polycondensation stage of 0.14 phr hafnium tetrakis(acetylacetonate). |
| Handle: | http://hdl.handle.net/11380/467697 |
| Titolare del brevetto: | General Electric Company, USA |
| Rilevanza: | internazionale |
| Numero di deposito: | EP909774 |
| Appare nelle tipologie: | Brevetto |
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