Catalyst composition for the preparation of polyesters, and rela

Details Catalyst composition for the preparation of polyesters, and rela Catalyst composition for the preparation of polyesters, and rela

1997-10-17

1999-05-11

Acquah, Samuel A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528280, 528286, 528302, 528308, 5283086, 524706, 524783, 524785, 502102, 502150, 502159, 502349, 502350, C08G63/78

Patent

active

059028734

ABSTRACT:
A catalyst composition for use in the preparation of a polyester or copolyester is disclosed. The catalyst composition comprises the combination of (a) a titanium-based compound or zirconium-based compound, and (b) a lanthanide series compound or hafnium. Various titanium-based compounds and lanthanide-based compounds are described. Moreover, in some embodiments, the catalyst composition may further comprise a phosphate-forming compound. Another aspect of this invention is an improved method for preparing a polyester, based, for example, on the two-stage process of ester interchange and polycondensation. The method is carried out in the presence of the catalyst composition described above.

REFERENCES:
patent: 5616681 (1997-04-01), Itoh et al.

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