Abstract: There is provided an oxygen absorbing agent that can have a capability of absorbing oxygen in an atmosphere even when the atmosphere is free or substantially free from moisture. The oxygen absorbing agent comprises a metal, the metal having been obtained by subjecting an alloy comprising (A) at least one transition metal selected from the group consisting of manganese, iron, platinum, and copper group metals and (B) at least one metal selected from the group consisting of aluminum, zinc, tin, lead, magnesium, and silicon to treatment with an acidic or alkaline aqueous solution to elute and remove at least a part of the component (B).

Abstract: There is provided an oxygen absorbing agent that can have a capability of absorbing oxygen in an atmosphere even when the atmosphere is free or substantially free from moisture. The oxygen absorbing agent comprises a metal, the metal having been obtained by subjecting an alloy comprising (A) at least one transition metal selected from the group consisting of manganese, iron, platinum, and copper group metals and (B) at least one metal selected from the group consisting of aluminum, zinc, tin, lead, magnesium, and silicon to treatment with an acidic or alkaline aqueous solution to elute and remove at least a part of the component (B).

Abstract: An oxygen absorbent composition absorbing water vapor mixed a liquid mixed (A) an aliphatic compound(s) with an unsaturated group(s) and (B) a transition metal salt(s) with (C) at least one solid selected from the group consisting of calcium oxide, calcium chloride and magnesium chloride.

Abstract: An oxygen absorbent composition absorbing water vapor mixed a liquid mixed (A) an aliphatic compound(s) with an unsaturated group(s) and (B) a transition metal salt(s) with (C) at least one solid selected from the group consisting of calcium oxide, calcium chloride and magnesium chloride.

Abstract: An oxygen absorbent comprising an aliphatic hydrocarbon(s) with an unsaturated group(s) and/or an unsaturated fatty acid compound(s) and a catalyst containing both a transition metal salt(s) and a non-transition metal salt(s) is provided, whereby an oxygen absorbing velocity is remarkedly promoted.

Abstract: There is disclosed herein an oxygen absorbent composition comprising an organic oxygen absorbent (A) which neither absorbs nor releases moisture and in which an oxidizable main component is supported on a porous silicate having an average pore diameter of 200 to 5,000 .ANG., and a formaldehyde absorbent (B) which neither absorbs nor releases moisture and is at least one of an amine, a thiol and a sulfonic acid that is supported on a porous carrier. According to this invention cultural assets made of organic materials which are required to be kept in a medial humidity atmosphere can be preserved in an atmosphere of a medial humidity, a low oxygen concentration and a low formaldehyde concentration by the use of the disclosed oxygen absorbent composition.

Abstract: An oxygen absorption composition without requiring moisture in oxygen absorption which comprises an oxygen absorbent comprising, as a principal component, an oligomer in liquid form having an unsaturated group, a number-average molecular weight in the range of 150 to 4,000 and a viscosity in the range of 100 to 4,000 cP such as butadiene oligomer in liquid form and an oxygen absorption-accelerating substance, being supported on a carrier; and an other gas absorbent. The principal component may be replaced with an oligomer in liquid form having an unsaturated group and being incorporated with an oxygen-unabsorptive diluent to adjust the viscosity of the mixture to 10 to 4,000 cP. The composition is enhanced in oxygen absorption capability in every preservation atmosphere from a low humidity to an intermediate and high humidity, easily producible, minimized in gas generation after oxygen absorption and almost free from odor.

Abstract: A vacuum heat insulator comprising an oxygen absorbent which does not require water to absorb oxygen, a dehydrating agent and an acidic gas absorbent. In a preferred embodiment, the oxygen absorbent comprises (i) at least one of an unsaturated fatty acid compound and a chain hydrocarbon polymer having an unsaturated group as a main component, and (ii) an oxygen absorbent accelerator. When arranged in a vacuum container or vacuum package, the vacuum heat insulator absorbs oxygen, water and acidic gases which permeate the vacuum container or package or which are generated within the vacuum container or package, to thereby maintain the degree of vacuum and good thermal insulating properties.