Oxygen scavenger composition, heat-generating composition and heat-generating structure
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United States of America Patent
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Mar 2, 1982
Grant Date -
N/A
app pub date -
Feb 23, 1979
filing date -
Feb 24, 1978
priority date (Note) -
Expired
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Abstract
An oxygen scavenger composition consisting essentially of [I] as essential components, (a) an alkali metal sulfide, and (b) at least one oxidation promoter selected from the group consisting of silica, alumina, silica-alumina, silica-magnesia and inorganic materials containing one of them as a main ingredient; and [II] as optional components, (c) at least one oxidation promoter aid, (d) a water-insoluble or sparingly water-soluble, inert filler, and/or (e) water in a hydrous or hydrated condition, a heat-generating composition of said composition being capable of scavenging at least 5 ml of oxygen per gram of the composition in air at 20.degree. C. during the period of one hour after oxidation reaction has substantially begun and a heat-generating structure comprising said composition and a film having an oxygen permeability of 0.01 to 50 cc/cm.sup.2 .multidot.min..multidot.O.sub.2 partial pressure (1 atm.), said film covering the composition over an area of 0.2 to 10 cm.sup.2 per gram of said composition.
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