Process for the preparation of polyesters having stabilized melt viscosity in the presence of aromatic (poly-)carbonates

摘要

The melt viscosity of high molecular weight linear polyesters is stabilized in the presence of aromatic (poly-)carbonates by adding a minor proportion of a non-volatile monofunctional ester-forming compound to a mixture of glycol and terephthalate or isophthalate reactants and heating the resulting mixture. The products of the process are suitable for conversion to compositions with aromatic (poly-)carbonates, especially flame retarded such compositions, where stabilized melt viscosity during fabrication is critical.