Oxygen scavenger compositions
AssigneeCryovac, Inc.
InventorsCynthia Louise Ebner, John Scott Hallock
Life of this patent
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Abstract
A composition suitable for scavenging oxygen is disclosed which comprises a carrier having a combination of a hydroxosulfitometalate and a transition metal ion source.
Claims25
An oxygen scavenger comprising a mixture of hydroxosulfitometlate and a separate, water soluble transition metal compound, said separate, water soluble transition metal compound having a transition metal component, and said hydroxosulfitometalate (HSM) comprising between 0.05 and 90 weight percent of said mixture and represented by the formula:
- MIMII2OH(SO3)2.H2O
- wherein MI represents a monovalent cation and MII represents a divalent cation;
- and said separate, water soluble transition metal compound is present in the mixture in an amount such that the molar ratio of the HSM to the transition metal component of the separate, water soluble transition metal compound is from 3000:1 to 1:1.
A method of scavenging oxygen from the interior atmosphere of a closed container comprising contacting moisture in the presence of the oxygen of said atmosphere to an oxygen scavenger comprising a mixture of hydroxosulfitometalate and a separate, water soluble transition metal compound, said separate, water soluble transition metal compound having a transition metal component and said hydroxosulfitometalate (HSM) comprising between 0.05 and 90 weight percent of said mixture and represented by the formula:
- MIMII2OH(SO3)2.H2O
- wherein MI represents a monovalent cation and MII represents a divalent cation;
- and said separate, water soluble transition metal compound is present in the mixture in an amount such that the molar ratio of the HSM to the transition metal component of the separate, water soluble transition metal compound is from 3000:1 to 1:1.
A container having an interior cavity suitable to contain an oxygen sensitive material which has, as at least a part of the container and exposed to the interior of said container, an oxygen scavenger comprising a mixture of hydroxosulfitometalate and a separate, water soluble transition metal compound, said separate, water soluble transition metal compound having a transition metal component and said hydroxosulfitometalate (HSM) comprising between 0.05 and 90 weight percent of said mixture and represented by the formula:
- MIMII2OH(SO3)2.H2O
- wherein MI represents a monovalent cation and MII represents a divalent cation;
- and said separate, water soluble transition metal compound is present in the mixture in an amount such that the molar ratio of the HSM to the transition metal component of the separate, water soluble transition metal compound is from 3000:1 to 1:1.
An oxygen scavenger comprising a mixture of:
- a) a hydroxosulfitometalate having a first surface area;
- and
- b) a separate, water soluble transition metal compound, said transition metal compound having a transition metal component, disposed on the first surface area of the hydroxosulfitometalate,
- wherein said hydroxosulfitometalate is represented by the formula:
- MIMII2OH(SO3)2.H2O
- wherein MI represents a monovalent cation and MII represents a divalent cation;
- and wherein said separate, water soluble transition metal compound is present in the mixture in an amount such that the molar ratio of the HSM to the transition metal component of the separate, water soluble transition metal compound is from 3000:1 to 1:1.
A sachet comprising a mixture of:
- a) hydroxosulfitometalate, and
- b) a separate, water soluble transition metal compound, said separate, water soluble transition metal compound having a transition metal component:
- wherein said hydroxosulfitometalate (HSM) comprises between 0.05 and 90 weight percent of said mixture, and is represented by the formula:
- MIMII2OH(SO3)2.H2O
- wherein MI represents a monovalent cation and MII represents a divalent cation;
- and wherein said separate, water soluble transition metal compound is present in the mixture in an amount such that the molar ratio of the HSM to the transition metal component of the separate, water soluble transition metal compound is from 3000:1 to 1:1.
A carrier comprising:
- a) a polymeric matrix, and
- b) a mixture, distributed in the polymeric matrix, comprising
- i) hydroxosulfitometalate, and
- ii) a separate, water soluble transition metal compound, said separate, water soluble transition metal compound having a transition metal component;
- wherein said hydroxosulfitometalate (HSM) comprises between 0.05 and 90 weight percent of said mixture, and is represented by the formula:
- MIMII2OH(SO3)2.H2O
- wherein MI represents a monovalent cation and MII represents a divalent cation;
- and wherein said separate, water soluble transition metal compound is present in the mixture in an amount such that the molar ratio of the HSM to the transition metal component of the separate, water soluble transition metal compound is from 3000:1 to 1:1.
Dependencies are inferred from the claim text.