Patent ID: 7273917

Claim:
A reaction product obtained by melt blending a combination comprising: a first polymer comprising aromatic ester units of formula wherein T is a divalent aromatic radical and D 1 is a divalent aromatic radical, and carbonate units of formula wherein at least 60% of the total number of D 2 groups are divalent aromatic radicals and the balance thereof are divalent aliphatic, alicyclic, or aromatic radicals; a second polymer comprising carbonate units of formula, wherein at least 60% of the total number of D 2 groups are divalent aromatic radicals and the balance thereof are divalent aliphatic, alicyclic, or aromatic radicals; and a transesterification catalyst, wherein the reaction product has a haze of less than 1.7% measured at a thickness of 3.2 mm according to ASTM D1003-00; and wherein the first and second polymers are selected such that, in the absence of the transesterification catalyst, the similarly melt blended combination has a haze of greater than 1.7% measured at a thickness of 3.2 mm according to ASTM D1003-00.