Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1997-03-13
1998-08-04
Acquah, Samuel A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528286, 528297, 528298, 528300, 528302, 528307, 528308, 5283086, C08G 6378
Patent
active
057895287
ABSTRACT:
The preparation of polyesters and copolyesters, titanium dioxide precipitates and/or titanium dioxide/silicon dioxide coprecipitates having a composition of TiO.sub.2 :SiO.sub.2 >90:10 mol/mol and/or titanium dioxide/zirconium dioxide coprecipitates having a composition of TiO.sub.2 :ZrO.sub.2 >95:5 mol/mol, which have been obtained by hydrolytic precipitation of the corresponding metal alcoholates formed from mono- or polyhydric alcohols, are proposed as polycondensation catalysts. They offer increased safety for the ecosystem and have a higher catalytic activity than Sb.sub.2 O.sub.3, so that the preferred amount used is only 10 to 100 ppm, based on the esters or oligoesters to be subjected to polycondensation. Their storage stability is good if the catalysts have a water content of from 0 to about 15 weight percent, preferably from 0 to about 5 weight percent based upon the hydrated precipitate or coprecipitate, as determined by Karl Fischer titration.
REFERENCES:
patent: 3817935 (1974-06-01), Beer
patent: 4208527 (1980-06-01), Horlbeck et al.
patent: 4421908 (1983-12-01), East
Berger Ulrich
Boehringer Bertram
Haferland Klaus
Kuhn Bernard
Martl Michael
Acquah Samuel A.
Akzo Nobel nv
Fennelly Richard P.
Morris Louis A.
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