| 摘要 |
<p>A bag, preferably a valve bag, and a method of making said bag are described. The bag consists of a multilayered, preferably two- or three-layered polymer material. The layers consist of polyolefin, preferably polyethylene, and of crosslinked olefin copolymer obtained by crosslinking of an olefin copolymer with hydrolysable silane groups, such as poly(ethylene/vinyl trimethoxy silane), under the action of water and silanol condensation catalyst. For producing the multilayered material, the silanol condensation catalyst is provided in a layer separate from the crosslinkable layer, for example in the polyolefin layer or in a separate layer, such as a master batch layer of silanol condensation catalyst. The multilayered material is produced by coextrusion and used for manufacturing bags in conventional manner, whereupon the crosslinkable polymer is crosslinked by subjecting the bag to the action of moisture and causing the silanol condensation catalyst to migrate into the crosslinkable layer or layers.</p> |
