| 摘要 |
<p>An easy to open package wherein an article is sealed between upper and lower thermoplastic webs comprises… a) an upper web having a contact surface of a first polymeric material… b) a lower web having a contact surface of a second polymeric material, and… c) a seal layer disposed between said surfaces and adhered to each of said opposite surfaces, the adhesive seal strength of the seal layer to the first and second surfaces being greater than its internal cohesive strength, said seal layer comprising… i) a first poiymer having a relatively low melt flow index selected from the group consisting of ionomers and ethylene vinylacetate copolymers, and… ii) a second polymer having a melt flow index substantially higher than the first polymer and being selected from the group consisting of low density polyethylene, ethylene/vinyl acetate copolymers, and modified ethylenervinyl acetate copolymers, whereby the second polymer is a low density polyethylene if the first polymer is an ethylene/vinylacetate copolymer.</p> |
