Patent ID: 6371318
Filing Date: 2002-04-16
Classification: B29B,B29C,B29L,B65D,C09K,Y10T

Abstract:
A plastic closure that comprises:a plastic cap having a base with a peripheral skirt defining a cap interior and means on the skirt for securing the closure to a container, and a liner compression molded in situ onto the interior of said base, said liner consisting essentially of: (1) continuous layers of matrix polymer alternating with continuous layers of barrier polymer material to resist transmission of gases, water vapor and flavorants through said liner, totaling at least nine alternating layers of matrix polymer and barrier material, and (2) a compatibilizer material comprising a thermoplastic resin for tying the matrix polymer to the barrier material by reactive bonds or non-reactive adhesion mechanisms, said compatibilizer material being disposed in said matrix polymer layers or in separate layers between said matrix polymer and barrier material layers.