Abstract: 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.
Type:
Grant
Filed:
March 5, 2001
Date of Patent:
December 16, 2003
Assignee:
E.I. du Pont de Numours and Company
Inventors:
Joseph V. Kurian, Diane M. Hahm, Benjamin A. Smillie