Stabilization of polycondensation catalysts
AssigneeUnion Carbide Corporation
InventorsKurt Weinberg, Gordon C. Johnson
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Abstract
The process for the stabilization of polycondensation catalysts and the stabilization composition used in such process for producing polyesters and copolyesters by the polycondensation of dicarboxylic acid and an aliphatic glycol using certain metal-containing polycondensation catalysts in conjunction with a stabilization composition formed as the reaction product of phosphoric acid, meta-phosphoric acid, superphosphoric acid or mixtures thereof and an aliphatic epoxide having between 2 and about 10 carbon atoms.
Claims15
A polycondensation catalyst/stabilizer composition for the preparation of a high molecular weight light colored polyethylene terephthalate comprising (1) a metal containing polycondensation catalyst wherein the metal is selected from the group consisting of titanium, zirconium, germanium, tin and mixtures thereof compound and (2) a stabilization composition which is the reaction product of phosphoric acid, metaphosphoric acid, superphosphoric acid, polyphosphoric acid or mixtures thereof and an aliphatic epoxide having between 2 and about 10 carbon atoms.
Dependencies are inferred from the claim text.