Oxygen indicator
First Claim
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1. A solid state oxygen color-change indicator for indicating the presence or absence of oxygen in gas comprising a solid mixture of(a) at least one dyestuff selected from the group consisting of compounds represented by the formula ##STR14## wherein -Y+ is selected from the group consisting of -O+ -, -S+ = and ##STR15## wherein Z is selected from the group consisting of hydrogen, an alkyl group having 1-4 carbon atoms and an aryl group having 6-7 carbon atoms;
- each of R1 -R6 is independently selected from the group consisting of hydrogen, an alkyl group having 1-4 carbon atoms, an alkoxy group having 1-4 carbon atoms and a nitro group;
each of R7 -R10 is independently selected from the group consisting of hydrogen and an alkyl group having 1-4 carbon atoms; and
X is halogen;
compounds represented by the formula ##STR16## wherein M is an alkali metal; and
mixtures thereof;
(b) at least one alkaline material selected from the group consisting of oxides and hydroxides of alkaline earth metals;
aluminum hydroxide;
phosphates, carbonates, and organic acid salts of alkaline earth metals and mixtures thereof; and
(c) at least one reducing agent selected from the group consisting of dithionites, ferrous compounds, reducing saccharides and mixtures thereof.
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Abstract
An oxygen indicator comprising at least one dyestuff, at least one alkaline substance and at least one reducing agent is disclosed.
50 Citations
23 Claims
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1. A solid state oxygen color-change indicator for indicating the presence or absence of oxygen in gas comprising a solid mixture of
(a) at least one dyestuff selected from the group consisting of compounds represented by the formula ##STR14## wherein -Y+ is selected from the group consisting of -O+ -, -S+ = and ##STR15## wherein Z is selected from the group consisting of hydrogen, an alkyl group having 1-4 carbon atoms and an aryl group having 6-7 carbon atoms; - each of R1 -R6 is independently selected from the group consisting of hydrogen, an alkyl group having 1-4 carbon atoms, an alkoxy group having 1-4 carbon atoms and a nitro group;
each of R7 -R10 is independently selected from the group consisting of hydrogen and an alkyl group having 1-4 carbon atoms; and
X is halogen;
compounds represented by the formula ##STR16## wherein M is an alkali metal; and
mixtures thereof;
(b) at least one alkaline material selected from the group consisting of oxides and hydroxides of alkaline earth metals;
aluminum hydroxide;
phosphates, carbonates, and organic acid salts of alkaline earth metals and mixtures thereof; and
(c) at least one reducing agent selected from the group consisting of dithionites, ferrous compounds, reducing saccharides and mixtures thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
- each of R1 -R6 is independently selected from the group consisting of hydrogen, an alkyl group having 1-4 carbon atoms, an alkoxy group having 1-4 carbon atoms and a nitro group;
Specification
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Current AssigneeMitsubishi Gas Chemical Company Incorporated (Mitsubishi Electric Corporation)
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Original AssigneeMitsubishi Gas Chemical Company Incorporated (Mitsubishi Electric Corporation)
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InventorsFujii, Yuichi, Yoshikawa, Yoshio, Goto, Mikio, Nawata, Takanari
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Primary Examiner(s)Padgett, Benjamin R.
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Assistant Examiner(s)Gron, T. S.
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Application NumberUS05/886,638Time in Patent Office566 DaysField of Search116/114 AM, 116/114 P, 252/408, 23/230 R, 23/230 B, 23/232 R, 23/253 TP, 23/254 R, 73/19, 73/23, 195/103.5 RUS Class Current436/138CPC Class CodesC09B 67/0092 Dyes in solid formC09B 7/02 Bis-indole indigosC12Q 1/28 involving peroxidaseC12Q 2326/00 Chromogens for determinatio...G01N 31/225 for oxygen, e.g. including ...Y10S 436/904 Oxidation - reduction indic...Y10T 436/207497 Molecular oxygenY10T 436/209163 Dissolved or trace oxygen o...
