Amorphous silica in packaging film
AssigneeCyrovac, Inc.
InventorsMichael L. Becraft, Nathanael R. Miranda, Drew V. Speer
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Abstract
An article of manufacture includes an oxygen scavenger and an amorphous silica. The article can be in the form of e.g. a film or sealing compound. A package can be made from the article for containing an oxygen-sensitive article such as food. The amorphous silica reduces migration of odor causing by-products of the oxygen scavenging process. A method of making an article of manufacture having reduced migration of by-products of an oxygen scavenging reaction includes providing an article including an oxygen scavenger and an amorphous silica; and exposing the article to actinic radiation.
Claims1
A method of making an article of manufacture comprising:
- a) providing an article comprising a blend of:
- i) an oxygen scavenger comprising a material selected from the group consisting of:
- (a) an oxidizable compound and a transition metal salt,
- (b) an ethylenically unsaturated hydrocarbon and a transition metal catalyst,
- (c) an ascorbate,
- (d) an isoascorbate,
- (e) a sulfite,
- (f) an ascorbate and a transition metal catalyst, the catalyst comprising a simple metal or salt, or a compound, complex or chelate of the transition metal,
- (g) a reduced form of a quinone, a photoreducible dye, or a carbonyl compound which has absorbence in the UV spectrum, and
- (h) a tannin;
- and
- ii) an amorphous silica;
- and
- b) exposing the article to actinic radiation;
- wherein the amorphous silica has:
- (i) a mean pore diameter of less than 200 Angstroms,
- (ii) a median particle size of less than 20 μm, and
- (iii) a surface area of greater than 200 m2/gram.
Dependencies are inferred from the claim text.