Patent EP0267724A1 successfully refreshed from Google Patents.
EP0267724A1
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EP
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Test devices with reagent layers formed by printing processes
Assignee: Unilever PLC
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Filing: 1987-11-02
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Granted: —
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Expires: 2007-11-02
Abstract
Abstract A test device for carrying out a microchemical test, comprises a container for contacting a reaction liquid during performance of said test, said container having deposited on a surface thereof which in use is to contact said reaction liquid, an adherent layer applied in an amount in the range 1 to 40 mg/sq cm comprising a chemically or electrochemically active material which has been deposited in the form of a composition comprising solid particles having a particle size in the range 0.5 to 25, e.g. 1 to 20, microns, together with a polymeric binder. A corresponding printable composition for printing a layer of a chemically or electrochemically active material on to a surface of a substrate to form such a device comprises (a) a chemically or electrochemically active substance to be deposited, dissolved in (b) a (e.g. aqueous) solvent for said substance (a), (c) a polymeric binder or thickener dissolved or dispersed in solvent (b), (c) from 1 to 15 percent by weight of a dispersed finely- divided inert particulate material with a particle size in the range 1 to 50 microns, and has a viscosity in the range 1 to 250 poise at 25 deg.C.
Inventors
- 👤 Edward Baginski
- 👤 Alan Frank Cattell
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 18:03
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/54; C12Q1/001; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/53; G01N33/543; G01N33/54313
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
A test device for carrying out a microchemical test, comprising a container for contacting a reaction liquid during performance of said test, said container having deposited on a surface thereof which in use is to contact said reaction liquid, an adherent layer applied in an amount in the range 1 to 40 mg/sq cm comprising a chemically or electrochemically active material which has been deposited in the form of a composition comprising solid particles having a particle size in the range 0.5 to 25, e.g. 1 to 20, microns, together with a polymeric binder.
Claim 2
Dependent Claim
94 words
A test device for carrying out a microchemical test, comprising a container for contacting a reaction liquid during performance of said test, said container having deposited on a surface thereof which in use is to contact said reaction liquid, an adherent layer applied in an amount in the range 1 to 40 mg/sq cm comprising a chemically or electrochemically active material which has been deposited in the form of a composition comprising solid particles having a particle size in the range 0.5 to 25, e.g. 1 to 20, microns, together with a polymeric binder.
Claim 3
Dependent Claim
37 words
A test device according to claim 1, wherein said particles comprise inert particles, e.g. ptfe or silica gel, and are dispersed in a matrix comprising said active material and a polymeric binder, e.g. a water-soluble cellulose derivative.
Claim 4
Dependent Claim
30 words
A test device according to claim 1, wherein said particles comprise said active material in solid finely-divided form, and are dispersed in a polymeric binder, e.g. a water-soluble cellulose derivative.
Claim 5
Dependent Claim
108 words
A process for manufacturing a test device according to claim 1, comprising printing a layer of a chemically or electrochemically active material on to a surface of a substrate which is to form an inner surface of a container for carrying out a microchemical test, said process also comprising: (a) providing a printable composition comprising said chemically or electrochemically active material, together with suspensible hydrophobic or hydrophilic particles having a particle size in the range 0.5 to 25 microns, (b) printing said printable composition containing said parti cles on to said substrate to form a layer on said surface, and (c) causing said layer to dry or solidify.
Claim 6
Dependent Claim
33 words
A process according to claim 4, wherein said chemically or electrochemically active material is water-soluble, e.g. selected from enzymes, antigens, antibodies, electron transfer agents able to react with enzymes, or pH buffer materials.
Claim 7
Dependent Claim
15 words
A process according to claim 4, wherein the active material is an ion-selective ionophore material.
Claim 8
Dependent Claim
77 words
A process according to claim 4, wherein the particle size is in the range from atleast about 3 micron to at least about 15 micron, and the particles are selected from ptfe, silica-gel, polystyrene, polymer latex, and comminuted solids comprising the chemically or electrochemically active material to be deposited, in an amount from at least about 1 percent to at least about 60 percent, e.g. about 5 to about 15 percent, by weight of the printable composition.
Claim 9
Dependent Claim
104 words
A printable composition for printing a layer of a chemically or electrochemically active material on to a surface of a substrate to form a device according to claim 1, comprising (a) a chemically or electrochemically active substance to be deposited, dissolved in (b) a (e.g. aqueous) solvent for said substance (a), (c) a polymeric binder or thickener dissolved or dispersed in solvent (b), (c) from 1 to 15 percent by weight of a dispersed finely-divided inert particulate material with a particle size in the range 1 to 50 microns, said composition having a viscosity in the range 1 to 250 poise at 25 deg.C.
Claim 10
Dependent Claim
108 words
A printable composition for printing a layer of a chemically or electrochemically active material on to a surface of a substrate to form a device according to claim 1, comprising (a) a polymeric binder or thickener dissolved or dispersed in a (e.g. nonaqueous) solvent, having dispersed therein (b) from 5 to 60 percent by weight of a chemically or electrochemically active (e.g. water-soluble or water-dispersible) substance to be deposited, in finely-divided solid particulate form having a particle size less than 20 micron, preferably less than 10 micron, said composition having a viscosity in the range 1 to 250 poise, preferably at least about 150 poise, at 25 deg.C.
Claim 11
Dependent Claim
57 words
A printable composition according to claim 8 or 9, wherein said composition shows shear-thinning of at least about 0.1 log viscosity per tenfold increase of shear rate in the range of shear rates about 10 to 100 reciprocal seconds, and has a viscosity at 200 reciprocal seconds at 25 deg.C. in the range 1 to 35 poise.
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