Oxygen indicator adapted for printing or coating and oxygen-indicating device
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsYoshio Yoshikawa, Takanari Nawata, Mikio Goto, Yukio Kondo
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Abstract
An oxygen indicator adapted for printing or coating which comprises (a) at least one reducing agent, (b) a dyestuff causing color change when it is reduced with the reducing agent, (c) at least one thickening agent and (d) at least one solvent and a sheet-like oxygen indicator in which a composition comprising the above four components (a)-(d) is coated or printed on a substrate are disclosed.
Claims21
An oxygen indicator adapted for printing which comprises
- (a) at least one reducing agent selected from the group consisting of mixtures of at least one alkaline substance and dithionites, ferrous compounds, reducing saccharides or mixtures thereof;
- ascorbic acid;
- erysorbic acid or a salt thereof;
- stannous salts;
- hydroxyamine;
- hydrazine;
- keto-carboxylic acids;
- sulfoxylates;
- alkali metal sulfides and boron hydrides;
- (b) a dyestuff which has a color in an atmosphere containing oxygen and a different color in a non-oxygen containing atmosphere when it is reduced with said reducing agent;
- (c) at least one thickening agent selected from the group consisting of sodium carboxymethyl cellulose, hydroxyethyl cellulose, methyl-cellulose, sodium alginate, polyvinyl alcohol, gum arabic powder, gum tragacanth, dextrin and casein in an amount of 0.05-10% by weight on the basis of (a), (b), (c) and (d);
- and
- (d) at least one solvent selected from the group consisting of water, alcohols, and mixtures thereof.
A sheet-like oxygen indicator comprising a sheet selected from the group consisting of cellulosic sheets and plastic sheets and a composition coated or printed thereon which comprises
- (a) at least one reducing agent selected from the group consisting of mixtures of at least one alkaline substance and dithionites, ferrous compounds, reducing saccharides or mixtures thereof;
- ascorbic acid;
- erysorbic acid or a salt thereof;
- stannous salts;
- hydroxyamine, hydrazine;
- keto-carboxylic acids;
- sulfoxylates;
- alkali metal sulfides and boron hydrides;
- (b) a dyestuff which has a color in an atmosphere containing oxygen and a different color in a non-oxygen containing atmosphere when it is reduced with said reducing agent;
- (c) at least one water soluble polymeric compound in an amount of 0.05 to 10% by weight on the basis of weight of the total composition selected from the group consisting of sodium carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose, sodium alginate, polyvinyl alcohol, gum arabic powder, gum tragacanth, dextrin and casein;
- and
- (d) at least one solvent selected from the group consisting of water, alcohols, and mixtures thereof.
Dependencies are inferred from the claim text.