Process for preparing polyesters with a catalyst system comprising an antimony-containing poly-condensation catalyst and an ethylenically unsaturated compound
AssigneeStauffer Chemical Company
InventorsRonald L. Muntz, Francis A. Via
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Abstract
A polycondensation process employing a catalyst system comprising an antimony-containing polycondensation catalyst and selected ethylenically unsaturated compounds, such as allyl glycidyl ether. The ethylenically unsaturated compound stabilizes the antimony-containing catalyst.
Claims7
A process for preparing polyesters comprising condensing glycol terephthalate at a temperature of 150.degree. C. to 350.degree. C. in the presence of a catalyst system which comprises an antimony-containing polycondensation catalyst and an ethylenically unsaturated compound having the formula ##STR2## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are independently selected hydrogen, alkyl, aryl, substituted alkyl or substituted aryl;
- and R.sup.6 is hydrogen, alkyl, aryl, acyl, allyl or epoxypropyl, the mole ratio of ethylenically unsaturated bond in said ethylenically unsaturated compound to said antimony-containing polycondensation catalyst being 1:1 to 30:1.
Dependencies are inferred from the claim text.