US4919890A
Expired / Lapsed
US
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Dry type analysis element
Assignee: Fujifilm Holdings Corp
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Filing: 1988-04-04
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Granted: 1990-04-24
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Expires: 2008-04-04
Abstract
Abstract A dry type analysis element for detecting a specific constituent in a liquid is provided. The dry type analysis element comprises a light-transmissive support having thereon at least one water-penetrative layer, at least one of said water-penetrative layer(s) containing a composition capable of interacting with said specific constituent in said liquid, wherein said composition contains a leuco dye comprising at least one compound selected from the group consisting of compounds represented formula [I] and salts of these compounds ##STR1## wherein R 1 represents a substituted or unsubstituted aryl group, R 2 represents a substituted or unsubustituted alkyl group, and R 3 represents a substituted or unsubstituted aryl group, and said leuco dye is dissolved in a hydrophobic solvent to form a solution that is contained in said water-penetrative layer as a dispersion in a hydrophilic medium.
Inventors
- 👤 Fuminori Arai
- 👤 Fusae Osada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:12
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525; Y; Y10; Y10S; Y10S435/00; Y10S435/805; Y10S435/81; Y10S436/00; Y10S436/807; Y10S436/81; Y10T; Y10T436/00; Y10T436/20; Y10T436/206664
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
141 words
A dry type analysis element for detecting a specific constituent in a liquid which comprises a light-transmissive support having thereon at least one water-penetrative layer and at least one of said water-penetrative layer(s) containing a composition capable of interacting with said specific constituent in said liquid, wherein said composition contains salts of a leuco dye comprising at least one compound selected from the group consisting of compounds represented by formula (I) ##STR4## wherein R 1 represents a substituted or unsubstituted aryl group, R 2 represents a substituted or unsubstituted alkyl group, and R 3 represents a substituted or unsubstituted aryl group, said salts being salts of at least two acids and said salts of said leuco dye being dissolved in a hydrophobic solvent to form a solution that is contained in said water-penetrative layer as a dispersion in a hydrophilic medium.
Claim 2
Dependent Claim
141 words
A dry type analysis element for detecting a specific constituent in a liquid which comprises a light-transmissive support having thereon at least one water-penetrative layer and at least one of said water-penetrative layer(s) containing a composition capable of interacting with said specific constituent in said liquid, wherein said composition contains salts of a leuco dye comprising at least one compound selected from the group consisting of compounds represented by formula (I) ##STR4## wherein R 1 represents a substituted or unsubstituted aryl group, R 2 represents a substituted or unsubstituted alkyl group, and R 3 represents a substituted or unsubstituted aryl group, said salts being salts of at least two acids and said salts of said leuco dye being dissolved in a hydrophobic solvent to form a solution that is contained in said water-penetrative layer as a dispersion in a hydrophilic medium.
Claim 3
Dependent Claim
52 words
A dry type analysis element as in claim 1, wherein the aryl group represented by R 1 is a substituted aryl group and the substituent of the aryl group is selected from the group consisting of a hydroxy group, an alkoxy group, an amino group, an alkylamino group, and a dialkylamino group.
Claim 4
Dependent Claim
21 words
A dry type analysis element as in claim 1, wherein the aryl group represented by R 1 is a phenyl group.
Claim 5
Dependent Claim
51 words
A dry type analysis element as in claim 2, wherein said substituent of the aryl group represented by R 1 is selected from the group consisting of an alkoxy group, an alkylamino group, and a dialkylamino group and the alkyl moiety in said substituent has from 1 to 3 carbon atoms.
Claim 6
Dependent Claim
24 words
A dry type analysis element as in claim 1, wherein the alkyl group represented by R 2 has from 1 to 3 carbon atoms.
Claim 7
Dependent Claim
46 words
A dry type analysis element as in claim 1, wherein the alkyl group represented by R 2 is a substituted alkyl group and the substituent of the alkoxy group is selected from the group consisting of a phenyl group, a phenoxy group and a 4-dimethylaminophenyl group.
Claim 8
Dependent Claim
46 words
A dry type analysis element as in claim 1, wherein the aryl group represented by R 3 is a substituted aryl group and the substituent of the aryl group is selected from the group consisting of a hydroxy group, an alkoxy group and a halogen atom.
Claim 9
Dependent Claim
40 words
A dry type analysis element as in claim 1, wherein the aryl group represented by R 3 is a substituted aryl group and the substituent of the aryl group is an alkoxy group having from I to 3 carbon atoms.
Claim 10
Dependent Claim
27 words
A dry type analysis element as in claim 1, wherein said at least two acids are selected from the group consisting of organic salts and inorganic salts.
Claim 11
Dependent Claim
39 words
A dry type analysis element as in claim 1, wherein said at least two acids are selected from the group consisting of hydrochloric acid, nitric acid, acetic acid, oxalic acid, citric acid, benzoic acid, salicylic acid and phthalic acid.
Claim 12
Dependent Claim
41 words
A dry type analysis element as in claim 1, wherein each of said at least two acids is used in an amount of at least 5 mol % based on the total amount of acids in said mixture of acid salts.
Claim 13
Dependent Claim
37 words
A dry type analysis element as in claim 1, wherein one of said at least two acids is used in a ratio of from 10 to 20 mol % based on the total amount of the acids.
Claim 14
Dependent Claim
19 words
A dry type analysis element as in claim 1, wherein the water penetrative layer comprises a hydrophilic polymeric binder.
Claim 15
Dependent Claim
41 words
A dry type analysis element as in claim 13, wherein the hydrophilic polymeric binder is a binder selected from the group consisting of gelatin, gelatin derivatives, cellulose derivatives, agarose, acrylamide polymers, methacrylamide polymers, copolymers of vinyl monomers with acrylamide or methacrylamide.
Claim 16
Dependent Claim
29 words
A dry type analysis element as in claim 1, wherein the concentration of the salts of the leuco dye in the hydrophobic solvent solution is from 0.5 to 10%.
Claim 17
Dependent Claim
39 words
A dry type analysis element as in claim 1, wherein the amount of the leuco dye in the water-penetrative layer is from 0.5 to 10% by weight based on the material which constitutes the layer in a dry state.
Claim 18
Dependent Claim
32 words
A dry type analysis element as in claim 1, wherein the element has at least two water-penetrative layers and said leuco dye is contained in at least one of said water-penetrative layer.
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| 3.5 Years (Year 4) | 1993-04-23 | 1993-10-23 | 1994-04-24 | $2000.00 | Window Closed / Lapsed |
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