CONTAINER CLOSURE AND METHOD FOR MANUFACTURE THEREOF

摘要

PURPOSE: To provide a gasket composition which has properties such that an effective seal can be provided at moderate pressures, while gas can be vented at high pressures with respect to a gasket in a container cap such as a bottle cap. CONSTITUTION: A molten, heated thermoplastic material is put into a cap so that the material is molded in the cap and cooled to provide a gasket. And the thermoplastic material is a mixture of a predetermined amount of butyl rubber and another thermoplastic polymer (polyethylene, etc.).