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).
Catalyst composition for the preparation of polyesters, and related processes / BANACH T., E; Pilati, Francesco; Colonna, M.; Fiorini, M.; Berti, C.; Toselli, M.; Messori, Massimo; Marianucci, E.. - .
Catalyst composition for the preparation of polyesters, and related processes
PILATI, Francesco;MESSORI, Massimo;
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).
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