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...http://www.google.com/patents/US5731053?utm_source=gb-gplus-sharePatent US5731053 - Potable liquid container
