Reversible detector for gaseous carbon dioxide
First Claim
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1. A reversible carbon dioxide detector comprising:
- a primed substrate comprising a primer comprising a first amount of a first plurality of dyes comprising pH sensitive color indicators and an amount of moisture effective to permit said pH sensitive color indicators to interact with carbon dioxide without substantial migration or flow of said first plurality of dyes on said substrate;
a coating over at least a portion of said substrate, said coating comprising a second amount of an effective activator, a third amount of a water insoluble organic binder, and a fourth amount of a second plurality of dyes comprising carbon dioxide sensitive color indicators;
wherein said water insoluble binder facilitates permeation of carbon dioxide from a surrounding medium through said coating into reversible contact with a combination of said first plurality of dyes and said second plurality of dyes;
wherein said first, second, third, and fourth amounts are effective to permit said combination of said first plurality of dyes and said second plurality of dyes to interact with said carbon dioxide to substantially instantaneously produce incremental reversible changes in color comprising a reproducible array of separate colors in which said separate colors correlate to separate given concentrations of carbon dioxide in a surrounding medium.
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Abstract
An apparatus and method for visually and continuously monitoring gaseous concentrations of electrophiles such as carbon dioxide. A coating composition comprising an organic binder, filler/pigment, an activator, and carbon dioxide sensitive color indicator interacts with a primed substrate to which it is applied for support. The coated primed substrate may then be used for estimation of carbon dioxide concentration by the detection of a substantially instantaneous and reversible color change of the coated primed substrate.
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Citations
31 Claims
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1. A reversible carbon dioxide detector comprising:
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a primed substrate comprising a primer comprising a first amount of a first plurality of dyes comprising pH sensitive color indicators and an amount of moisture effective to permit said pH sensitive color indicators to interact with carbon dioxide without substantial migration or flow of said first plurality of dyes on said substrate;
a coating over at least a portion of said substrate, said coating comprising a second amount of an effective activator, a third amount of a water insoluble organic binder, and a fourth amount of a second plurality of dyes comprising carbon dioxide sensitive color indicators;
wherein said water insoluble binder facilitates permeation of carbon dioxide from a surrounding medium through said coating into reversible contact with a combination of said first plurality of dyes and said second plurality of dyes;
wherein said first, second, third, and fourth amounts are effective to permit said combination of said first plurality of dyes and said second plurality of dyes to interact with said carbon dioxide to substantially instantaneously produce incremental reversible changes in color comprising a reproducible array of separate colors in which said separate colors correlate to separate given concentrations of carbon dioxide in a surrounding medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A reversible carbon dioxide detector comprising:
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a primed substrate comprising a primer comprising a first amount of a first plurality of dyes comprising about 50% by weight N-methyl-4-(phenylazo)benzenamine and approximately equal parts by weight of dyes selected from the group consisting of o-cresolsulfonaphthalein;
thymolsulfonaphthalein;
p-benzenesulfonic-azo-dimethylaniline;
o-carboxybenzene-azo-dimethylaniline;
amino-dimethyl amino-toluphenazonium chloride;
benzene-azo-dimethyl-amine;
2,4,6-trinitrophenyl-methyl-nitro amine;
p-nitro benzene-azo-salicylic acid; and
thymolphthalein, said primer further comprising an amount of moisture effective to permit said first plurality of dyes to interact with carbon dioxide without substantial migration or flow of said first plurality of dyes on said substrate;
a coating over at least a portion of said substrate, said coating comprising a second amount of an effective activator, a third amount of a water insoluble organic binder, and a fourth amount of a second plurality of dyes comprising carbon dioxide sensitive color indicators;
wherein said water insoluble binder facilitates permeation of carbon dioxide from a surrounding medium through said coating into reversible contact with a combination of said first plurality of dyes and said second plurality of dyes;
wherein said first, second, third, and fourth amounts are effective to permit said combination of said first plurality of dyes and said second plurality of dyes to interact with said carbon dioxide to substantially instantaneously produce incremental reversible changes in color comprising a reproducible array of separate colors in which said separate colors correlate to separate given concentrations of carbon dioxide in a surrounding medium. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A reversible carbon dioxide detector comprising:
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a primed substrate comprising a primer comprising a first amount of a first plurality of dyes comprising pH sensitive color indicators and an amount of moisture effective to permit said pH sensitive color indicators to interact with carbon dioxide without substantial migration or flow of said first plurality of dyes on said substrate;
a coating over at least a portion of said substrate, said coating comprising;
a second amount of an effective activator;
a third amount of a water insoluble organic binder, a fourth amount of a second plurality of dyes comprising carbon dioxide sensitive color indicators; and
,a fifth amount of a persistant humectant effective to maintain components in said coating in a form selected from the group consisting of ionized form and ionizable form;
wherein said water insoluble binder facilitates permeation of carbon dioxide from a surrounding medium through said coating into reversible contact with a combination of said first plurality of dyes and said second plurality of dyes;
wherein said first, second, third, fourth, and fifth amounts are effective to permit said combination of said first plurality of dyes and said second plurality of dyes to interact with said carbon dioxide to substantially instantaneously produce incremental reversible changes in color comprising a reproducible array of separate colors in which said separate colors correlate to separate given concentrations of carbon dioxide in a surrounding medium. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
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Specification