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US 6,399,170 B1Granted
Plastic closure with compression molded barrier liner
AssigneeOwens-Illinois Closure Inc.
InventorsMark R. Hock, David B. Riffer
Life of this patent
Estimating the term…
Abstract
A plastic closure that includes a cap having a base with a peripheral skirt defining a cap interior and threads on the skirt for securing the closure to a container. A liner is secured to the interior of the cap, preferably by compression molding in situ. The liner consists essentially of a blend of a matrix polymer, a particulate barrier polymer and an compatibilizer. The heat and pressure of compression forms the particles of barrier polymer into platelets that are oriented essentially parallel to the plane of the disk.
Claims16
A plastic closure that comprises:
- a plastic cap having a base with a peripheral skirt defining a cap interior and means on said 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 a liner body of a matrix polymer containing a dispersion of discrete overlapping platelets of a barrier polymer material, said platelets being dispersed throughout said body and oriented essentially parallel to said base, said liner having a Shore A hardness not greater than 95.
A plastic closure that comprises:
- a plastic cap having a base with a peripheral skirt defining a cap interior and means on said 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 a liner body of a matrix polymer containing a dispersion of discrete overlapping platelets of a barrier polymer material and, optionally, a compatibilizer comprising a thermoplastic resin to promote adhesion between the matrix polymer and the barrier platelets by reactive bonds or non-reactive adhesion mechanisms, said platelets being dispersed throughout said body and oriented essentially parallel to said base, said liner having a Shore A hardness not greater than 95.
Dependencies are inferred from the claim text.