Polyester blends exhibiting low temperature toughness

摘要

Polymer blends suitable for packaging are disclosed that include one or more impact modifiers; and one or more polyethylene terephthalate homopolymers or copolymers obtained by a melt phase polymerization using a catalyst system comprising aluminum atoms in an amount, for example, from about 3 ppm to about 60 ppm and one or more alkaline earth metal atoms, alkali metal atoms, or alkali compound residues in an amount, for example, from about 1 ppm to about 25 ppm, in each case based on the weight of the one or more polyethylene terephthalate homopolymers or copolymers The polymer blends disclosed exhibit improved low temperature toughness compared with blends made using polymers prepared with conventional catalyst systems.

主权项

1. An extruded film extruded from an amorphous polymer blend comprising:
a. an impact modifier component present in an amount of from about 2 to about 33 weight percent of one or more epoxy-containing impact modifying polymers, based on the total weight of the polymer blend, and b. a phthalic acid-based polymer component comprising one or more polyethylene terephthalate copolymers comprising aluminum atoms in an amount from about 3 ppm to about 60 ppm and one or more alkaline earth metal atoms, alkali metal atoms, or alkali compound residues in an amount from about 1 ppm to about 25 ppm, in each case based on the weight of the one or more polyethylene terephthalate copolymers, wherein all of the polymers of the phthalic acid-based polymer component comprise an ethylene glycol monomer unit and a phthalic acid dicarboxylic acid monomer unit including at least 95 mole % terephthalic acid and isophthalic acid, wherein the polymer blend does not comprise polyamide and has an intrinsic viscosity of 0.82 dL/g or less and a 50% failure ductile-to-brittle transition temperature of −28° C. or less; wherein the one or more polyethylene terephthalate copolymers are made without the addition of any catalytically active metal or metal compounds other than the aluminum atoms and the one or more alkaline earth metal atoms or alkali metal atoms.