Rapid oxygen absorption by using activators

Absorbing oxygen from a closed space at a rapid rate, particularly in food packaging, is made possible by introducing an alcohol-water mixture as an activator for iron-based absorber systems, preferably including an acid to control pH. Preferred alcohols are aliphatic alcohols, particularly, monohyd...

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Bibliographische Detailangaben
Hauptverfasser:	LUTHRA VINOD K, SANTHANAM KALATHUR S. V, EVANS SUSAN P, SLOAN R. ANDREW
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR ADHESIVES CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS CONVEYING DYES FOODS OR FOODSTUFFS FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BYSUBCLASSES A23B - A23J HANDLING THIN OR FILAMENTARY MATERIAL HUMAN NECESSITIES MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PACKAGES PACKAGING ELEMENTS PACKING PAINTS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL POLISHES PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL STORING THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OFNUTRITIVE QUALITIES, PHYSICAL TREATMENT THEIR RELEVANT APPARATUS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES TRANSPORTING
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Beschreibung
Zusammenfassung:	Absorbing oxygen from a closed space at a rapid rate, particularly in food packaging, is made possible by introducing an alcohol-water mixture as an activator for iron-based absorber systems, preferably including an acid to control pH. Preferred alcohols are aliphatic alcohols, particularly, monohydric alkanols, such as methanol, ethanol, n-propanol, isopropanol, sec-butanol and t-butanol. Such absorber-activator combinations are capable of rapidly reducing the oxygen in a closed package. A preferred acid is orthophosphoric acid used in an amount sufficient to establish a pH of about 0.6 to 4. A preferred iron-based absorber system employs sponge iron, optionally including a dibasic acid cooperating with the orthophosphoric acid to control pH in the system. In one preferred embodiment, the iron-based absorber is pre-activated by contacting with the activator in the substantial absence of oxygen for a predetermined period of time.