Sealed containers and sealing compositions for them
AssigneeW. R. Grace & Co.-Conn.
InventorsRobert H. Hofeldt, Stephen A. C. White
Life of this patent
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Abstract
A sealing composition for a container closure comprising a polymeric matrix material and is modified by the inclusion therein of an oxygen scavenger. The composition can be in fluid or meltable form ready for application to a closure or it can be present as a deposit on the closure, for instance a gasket around the closure. Preferably the scavenging properties of the deposit are activated by pasteurizing or sterilizing the deposit when sealing a container with the closure. The invention is of particular value when the closure is a metal cap for a beer bottle.
Claims17
A closure gasket composition comprising a polymeric matrix in a liquid or molten form and an isoascorbiate oxygen scavenger.
A gasket composition comprising a thermoplastic resin and an oxygen scavenger of an isoascorbate.
A thermoplastic gasket composition comprising a thermoplastic blend of polyethylene and ethylene vinyl acetate copolymer and an oxygen scavenger formed of an isoascorbate present in an amount of from about 0.5 to 10 parts by weight per 100 parts by weight of the thermoplastic blend.
A gasket composition comprising polyethylene and an isoascorbate oxygen scavenger.
Dependencies are inferred from the claim text.