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Last Updated: January 26, 2022

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Claims for Patent: 6,039,892

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Summary for Patent: 6,039,892
Title: Oxygen absorbent composition
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.
Inventor(s): Himeshima; Tomoharu (Chiba-ken, JP), Nakagawa; Kazumoto (Tokyo, JP), Iwai; Tatsuo (Tokyo, JP), Watanabe; Takayuki (Chiba-ken, JP)
Assignee: Mitsubishi Gas Chemical Company, Inc. (Tokyo, JP)
Application Number:09/246,844
Patent Claims:1. 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.

2. The composition according to claim 1 wherein an oxidizable main component of the organic oxygen absorbent (A) is at least one selected from unsaturated fatty acid compounds and chain hydrocarbon polymers having an unsaturated group.

3. The composition according to claim 1 wherein the porous silicate having an average pore diameter of 200 to 5,000 .ANG.is at least one selected from the group consisting of diatomaceous earth, Kanuma soil and sepiolite.

4. The composition according to claim 1 wherein the porous carrier for formaldehyde absorbent (B) is a porous silicate having an average pore diameter of 200 to 5,000 .ANG..

5. The composition according to claim 1 wherein the porous silicate carrier for formaldehyde absorbent (B) having an average pore diameter of 200 to 5,000 .ANG. is at least one selected from the group consisting of diatomaceous earth, Kanuma soil and sepiolite.

6. The composition according to claim 1 wherein the porous carrier for formaldehyde absorbent (B) is activated carbon.

7. The composition according to claim 1 wherein the amine, the thiol or the sulfonic acid is solid at -10.degree. C. to 50.degree. C.

8. The composition according to claim 7 wherein the amine, the thiol or the sulfonic acid is at least one selected from the group consisting of 2-amino-5-methylbenzenesulfonic acid, m-aminobenzenesulfonic acid, 4-amino-2-chlorotoluene-5-sulfonic acid, 1-naphthylamine-4-sulfonic acid, 2-aminonaphthalene-1-sulfonic acid, 4-aminobenzenesulfonic acid, 3-amino-6-chlorotoluene-4-sulfonic acid, 7-hydroxynaphthalenesulfonic acid, 2-amino-5-naphthol-7-sulfonic acid, 6-amino-4-hydroxy-2-naphthalenesulfonic acid, and 4-amino-5-hydroxy-2,7-naphthalenesulfonic acid which have both of an amino group and a sulfonic group in a molecule, and cystine having both of the amino group and a mercapto group.

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