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US 5,425,896 AGranted
Methods and compositions for oxygen scavenging
AssigneeW. R. Grace & Co.-Conn.
InventorsDrew V. Speer, William P. Roberts, Charles R. Morgan
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AssigneeW. R. Grace & Co.-Conn.
InventorsDrew V. Speer, William P. Roberts, Charles R. Morgan
Estimating the term…
A method of initiating oxygen scavenging by compositions which comprise oxidizable organic compounds and transition metal catalysts is disclosed. The method comprises initiating scavenging by exposing the composition, etc., to radiation. The radiation exposure is preferably electron beam or ultraviolet light and is preferably used on oxygen scavenging compositions which comprise a substituted or unsubstituted ethylenically unsaturated hydrocarbon and a transition metal catalyst. Inclusion of a photoinitiator or antioxidant in the scavenging composition is also preferred to facilitate and/or control the composition's scavenging properties. The method can be used for initiating scavenging in packaging layers or articles for oxygen sensitive products such as food and beverage.
A process of preparing a layer or article suitable for scavenging oxygen wherein the layer or article comprises a film comprising an oxidizable organic compound and a transition metal catalyst, by exposing the film to actinic radiation having a wavelength of less than about 750 nm at an intensity of at least about 1.6 mW/cm.sup.2 or an electron beam at a dose of at least about 0.2 megarads, wherein after initiation and in the presence of oxygen, the oxygen scavenging rate of the oxidizable organic compound is at least about 0.5 cc oxygen per day per gram of oxidizable organic compound for at least two days after oxygen scavenging is initiated.
Dependencies are inferred from the claim text.