The present invention provides a heat-sealable polyester composition having an
amorphous processing window ranging from a Tg in the range of about 40 C.
to about 70 C., to a Tcg in the range of about 70 C. to about 150
C. The composition preferably contains a mixture of poly(ethylene terephthalate)
homopolymer or copolymer and poly(trimethylene terephthalate) homopolymer or copolymer,
either as a physical blend or as a copolyester oligomer or polymer prepared from
the respective monomers. The resulting composition is heat-sealable at low temperatures,
retains barrier properties and is non-flavor-scalping.
