Low temperature heat-sealable polyester film and method for producing the same
AssigneeE.I. Du Pont De Numours and Company
InventorsJoseph V. Kurian, Diane M. Hahm, Benjamin A. Smillie
Life of this patent
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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.
Claims15
A composition comprising a blend of two distinct polyesters having an amorphous processing window ranging from a glass transition temperature, Tg, in the range of about 40° C. to about 70° C. to a peak crystallization temperature from the amorphous state, Tcg, in the range of about 70° C. to about 150° C., wherein at least one of the two distinct polyesters comprises a poly(trimethylene terephthalate) homopolymer or copolymer.
A polyester composition comprising a blend of poly(ethylene terephthalate) homopolymer or copolymer and about 5% to about 95% by weight poly(trimethylene terephthalate) homopolymer or copolymer based on the total weight of poly(ethylene terephthalate) and poly(trimethylene terephthalate), wherein said blend has an amorphous processing window ranging from a glass transition temperature, Tg, in the range of about 40° C. to about 70° C. to a peak crystallization temperature from the amorphous state, Tcg, in the range of about 70° C. to about 150° C.
Dependencies are inferred from the claim text.