Packaging articles suitable for scavenging oxygen
AssigneeW. R. Grace & Co.-Conn.
InventorsDrew V. Speer, William P. Roberts, Charles R. Morgan, Cynthia L. Ebner
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Abstract
An article useful for packaging oxygen-sensitive products is disclosed. The article is a single or multi-layer article capable of enveloping the oxygen sensitive product. The article has at least one layer which contains a composition composed of an ethylenically unsaturated hydrocarbon polymer and a transition metal salt. The layer is capable of scavenging oxygen at a rate of at least 1 cc oxygen per square meter per day and has a capacity of at least 250 cc oxygen per square meter per mil thickness of the layer.
Claims28
An article for packaging an oxygen-sensitive product, which article in use envelops the product and comprises a layer suitable for scavenging oxygen comprising an oxygen scavenging component consisting essentially of
- (a) an ethylenically unsaturated hydrocarbon polymer having a molecular weight of at least 1,000 and
- (b) 10-10,000 parts per million based on component (a) of transition metal atom of a transition metal salt;
- wherein the rate of oxygen scavenging of the layer at 25.degree. C. and one atmosphere of air is at least 1 cc oxygen per square meter per day and the scavenging capacity is at least 250 cc oxygen per square meter per mil thickness of the layer, and wherein scavenging occurs during the storage of the product in the package.
An article as in any of the proceeding claims wherein the article exhibits a transmission rate equal to or less than 1.0 cc oxygen per square meter of article surface per day per atmosphere at 25.degree. C.
An article as in any of the proceeding claims wherein said layer scavanges oxygen at a rate sufficient to reduce the amount of oxygen in an atmosphere within the article to less than 0.1% by volume in less than four weeks.
Dependencies are inferred from the claim text.