Oxygen scavenging compositions with low migration
AssigneeW. R. Grace & Co.-Conn.
InventorsCynthia Louise Ebner, Thomas Andrew Blinka
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Abstract
An improved oxygen scavenging composition and packaging container formed therefrom is disclosed. The container is suitable for storage of oxygen sensitive materials and has as part of its exposed interior surface a composition composed of a polymeric matrix with a substantially water insoluble oxygen scavenger and a substantially water-insoluble transition metal containing compound distributed therein.
Claims20
A product that is a container having an interior suitable to contain an oxygen sensitive material which has, as part of said container and exposed to the interior of said container, a solid oxygen scavenging composition comprising a polymeric matrix having distributed therein a mixture consisting essentially of i) at least one water insoluble oxygen scavenging agent selected from ascorbate compound, sulfite salt or mixtures thereof;
- and ii) at least one water-insoluble transition metal compounds, wherein the polymeric matrix has at least about 0.1 weight percent of said oxygen scavenging agent, a mole ratio of agent to transition metal of from about 3000:1 to 20:1 and the water solubility of the oxygen scavenging agent and transition metal compound is less than 0.1 gram per 100 cc water at 25° C.
A method of scavenging oxygen contained in a closed interior of a container comprising exposing the interior of said container to a composition comprising a carrier containing i) at least one oxygen scavenging agent selected from substantially water insoluble ascorbate compounds or sulfite salts, or mixtures thereof;
- and ii) at least one substantially water-insoluble transition metal compound, wherein the polymeric matrix has at least about 0.1 weight percent of said oxygen scavenging agent, a mole ratio of agent to transition metal of from about 3000:1 to 20:1 and the water-solubility of the oxygen scavenging agent and transition metal compound is less than 0.1 gram per 100 cc water at 25° C.
Dependencies are inferred from the claim text.