Polymer sealing insert for a container closure made of metal or plastic

摘要

A closure made of metal or plastic for a container for accommodating beverages or food has a mouth opening which is to be closed by the container closure. The container closure has a sealing insert which is arranged such that it closes the mouth opening with sealing action when the container closure is fitted on the container. The container closure, including the sealing insert, does not contain any halogen-containing material, and the sealing insert comprises at least two different polymers, of which at least one is a barrier polymer with a Shore D hardness of at most 40 and oxygen permeability of at most 1000 cm 3 ⋅ 100 μm/m2 ⋅ d ⋅ bar and, without the Shore D hardness being limited, with oxygen permeability of at most 10 cm 3 ⋅ 100 μm/m2 ⋅ d ⋅ bar. The oxygen permeability, in accordance with DIN 53380-3, is determined at an oxygen concentration of 100%, relative humidity of 100%, atmospheric pressure and a measuring temperature of 26° C and is related to a layer thickness of 100 μm.