pH electrode and methods of preparing and using same
First Claim
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1. A pH electrode having a pH-sensitive region on an electrically conductive support, said pH-sensative region comprisinga mixture of between 50 and 85% of the total mixture by weight of metal particles, said metal particles consisting of particles of antimony and optionally particles of Group VIII metals, particles of additional Group VA metals other than antimony, or both, and a polymer substrate of a non-shrinking polyimide having a resistivity of 10 to 100 Kohms/square;
- wherein the mixture of metal particles is incorporated in, or applied to, the polymer substrate and, wherein when said particles are incorporated into said resistive polymer substrate, said pH-sensitive region is abraded to expose said particles.
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Abstract
A pH electrode having a pH-sensitive region on an electrically conductive support, said pH-sensitive region comprising
- a mixture of
- between 50% and 85% of the total mixture by weight of particles of a Group VA or Group VIII metal incorporated in, or applied to, a polymer substrate of a non-shrinking plastic selected from polyimides, the polymer substrate having a resistivity of 10 to 100 Kohms/square
- the metal particles including antimony particles
- and, when said particles are incorporated into said resistive polymer substrate, having said pH-sensitive region abraded to expose said particles.
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Citations
30 Claims
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1. A pH electrode having a pH-sensitive region on an electrically conductive support, said pH-sensative region comprising
a mixture of between 50 and 85% of the total mixture by weight of metal particles, said metal particles consisting of particles of antimony and optionally particles of Group VIII metals, particles of additional Group VA metals other than antimony, or both, and a polymer substrate of a non-shrinking polyimide having a resistivity of 10 to 100 Kohms/square; -
wherein the mixture of metal particles is incorporated in, or applied to, the polymer substrate and, wherein when said particles are incorporated into said resistive polymer substrate, said pH-sensitive region is abraded to expose said particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for preparing a pH electrode comprising formation of a pH-sensitive region on an electrically conductive support by applying thereto a polymer substrate of a non-shrinking plastic selected from polyimides, having a resistivity of 10 to 100 Kohms/square, said polymer substrate further comprising between 50 and 85% of the total mixture by weight of metal particles, said metal particles consisting of particles of antimony and optionally particles of Group VIII metals, particles of additional Group VA metals other than antimony, or both incorporated therein or applied thereto either before or after application of said polymer substrate to said support,
wherein when said particles are incorporated into said resistive polymer substrate, said pH-sensitive region is abraded to expose said particles.
Specification