Stabilized polyester-polycarbonate blends and stabilization process therefor

Claim 1

A process for stabilizing a composition comprising at least one poly(alkylene dicarboxylate) prepared by the reaction of at least one alkenediol with at least one dicarboxylic acid or dialkyl ester thereof in the presence of a titanium compound as catalyst and at least one aromatic polycarbonate, which comprises adding thereto an amount effective to inhibit ester-carbonate interchange of at least one α-hydroxy or α-amino aliphatic acid derivative, or o-hydroxy or σ-amino aromatic acid derivative, of the formula ##STR6## wherein: X 1 is 0 or NH; X 2 or OR 5 when X 1 is NH and is OR 5 or NHR 5 when X 1 is 0; Z is CH or a single-ring aromatic carbocyclic radical in which the X 1 H and ##STR7## moieties occupy ortho positions; R 4 is hydrogen, a lower alkyl radical or a lower aryl radical which optionally contains hydroxy or COOR 5 substituents; and R 5 is hydrogen, lower alkyl or lower aryl.