Phosphate-containing catalyst composition for the preparation of

Details Phosphate-containing catalyst composition for the preparation of Phosphate-containing catalyst composition for the preparation of

1999-10-04

2000-03-28

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, C08G 6378, B01J 3100, C08K 302

Patent

active

060433353

ABSTRACT:
Polyesters are prepared by the reaction of a dicarboxylic acid, preferably an aromatic acid such as terephthalic acid, or an ester or ester-forming derivative thereof with a dihydroxy compound such as 1,4-butanediol in the presence of a catalyst composition comprising the combination of a titanium-based compound such as tetra-n-butyl titanate, a zirconium-based compound such as zirconium tetrakis(2,4-pentanedionate) and a phosphate-forming compound such as sodium dihydrogen phosphate. This catalyst composition affords polyesters having relatively low melt viscosities in short reaction times and does not produce an excessive level of undesirable reaction by-products.

REFERENCES:
patent: 5616681 (1997-04-01), Itoh et al.
patent: 5902873 (1999-05-01), Banach et al.

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