| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polymer possessing the best barrier properties of 2GT and 3GT, that can be easily heat-sealed at low sealing bar temperatures and fast sealing speeds, yet still produces seals of high strength. <P>SOLUTION: The present invention provides a heat-sealable polyester composition having an amorphous processing window ranging from a Tg in the range of about 40 to about 70°C, to a Tcg in the range of about 70 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 no flavor is wrested. <P>COPYRIGHT: (C)2013,JPO&INPIT |
