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Material for establishing solid state contact for ion selective electrodes

  • US 5,804,049 A
  • Filed: 09/15/1993
  • Issued: 09/08/1998
  • Est. Priority Date: 09/15/1993
  • Status: Expired due to Term
First Claim
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1. A ion selective sensor comprising:

  • an electrically conductive material providing a reference redox couple, said electrically conductive material including mobile ions having a first charge;

    and acrylic polymeric material having immobilized charge sites, said immobilized charge sites having a second charge opposite said first charge, said acrylic polymeric material swelling to a weight of not more than 5 times its dry weight when contacted with water, said acrylic polymeric material being provided on said electrically conductive material;

    an ion selective material covering said acrylic polymeric material, wherein said electrically conductive material and said ion selective material are not in direct physical contact; and

    said acrylic polymeric material including less than 1.63×

    1021 immobilized charge sites per gram,wherein said acrylic polymeric material comprises the copolymerization product of at least one charged monomer and at least one member selected from the group consisting of neutral monomers and polymers,wherein said acrylic polymeric material comprises the copolymerization product of at least one charged acrylic monomer and at least one neutral acrylic monomer,wherein said at least one charged acrylic monomer has the formula;

    ##STR3## where R1 is selected from the group consisting of hydrogen, hydrocarbons groups, and alcohol groups, and Y has the formula;

    ##STR4## where R2 is selected from the group consisting of straight saturated hydrocarbon chains, branched saturated hydrocarbon chains, straight unsaturated hydrocarbon chains, branched unsaturated hydrocarbon chains, straight saturated hydrocarbon chains having hydroxy functionalities, branched saturated hydrocarbon chains having hydroxy functionalities, straight unsaturated hydrocarbon chains having hydroxy functionalities and branched unsaturated hydrocarbons having hydroxy functionalities, R3, R4, and R5 are each selected from the group consisting of hydrogen, hydrocarbon groups, and alcohol groups, and can be the same or different, and Z- is selected from the group consisting of halides, acetate, and methylsulfate ion,wherein R1 is selected from the group consisting of H and CH3,R2 is selected from the group consisting of straight and branched saturated hydrocarbon chains,R3, R4, and R5 are each selected from the group consisting of H and CH3 and can be the same or different, andZ is a halide,wherein R3, R4, and R5 each compromise CH3, andZ is a chloride,wherein said at least one charged acrylic monomer comprises methacrylamidopropyltrimethylammoniumchloride.

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