Polyethylene terephthalate molding compositions

Claim 1

A polyethylene terephthalate dry blend consisting essentially of (a) 20-90% by weight of components (a), (b) and (c) of at least one polyethylene terephthalate having an inherent viscosity of at least 0.4 dl/g, as measured by ASTM D-2857, (b) 1-10% by weight of components (a), (b) and (c) of at least one sodium or potassium salt of a hydrocarbon carboxylic acid of 9-25 carbon atoms or at least one sodium or potassium salt of an ionic hydrocarbon copolymer of an α-olefin of 2-5 carbon atoms and an α,β-ethylenically unsaturated carboxylic acid of 3-5 carbon atoms in which the carboxyl groups have been at least partially neutralized with Na + or K + cations, provided the amount present is sufficient to provide a H H /H C ratio of less than 0.25 to the blend, (c) 0.1-10% by weight of components (a), (b) and (c) of at least one benzoate oligomer of the formula ##STR15## wherein --R-- is selected from the class consisting of ##STR16## wherein --R" is H-- or alkyl of 1-3 carbon atoms or ##STR17## --R 1 -- is selected from the class consisting of alkylene of 2-6 carbon atoms, arylene or alicyclic alkylene of 6-8 carbon atoms, and X is a cardinal number of between 1 ad 5, provided that the amount present is sufficient to lower the TpK of a blend of (a) and (b) by at least about 4° C.