Abstract: Potable liquid containers including a container, container closure and a closure liner, where the closure liner is formed from a polymeric heterogeneous blend of unvulcanized and uncrosslinked butyl rubber and a thermoplastic polymer are described. The closure liners are used for containers with closures such as a twist crown, a crown cork or a screw cap, for bottles, jars and the like, and more specifically for beer, juice and soft-drink bottles with closures made of metal or plastics.

Abstract: The invention relates to a polymer compound for the production of sealing elements for vessel or container closures, which sealing elements when closed have a barrier effect preventing the penetration of gaseous or vaporous substances such as oxygen or aromatic compounds, in particular benzenes, phenyl ethers and suchlike into the vessel and/or show an excess pressure valve effect at interior vessel pressures of between approx. 3 and 10 bar and may be produced by mechanical forming of the unshaped thermally plastified polymer compound and its subsequent hardening directly on or in the vessel closure ("in shell" moulding), comprising a mixture of butyl and/or acrylate rubber and a polymer of an .alpha.-oleflnic unsaturated monomer as well as, if appropriate, one or several further polymer components and common additives such as glide enhancers, pigment, talcum and stabilizers. The invention further relates to a sealing element of this kind and a corresponding vessel or container closure.