Thick film compositions for making medical electrodes
First Claim
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1. A conductive composition for iontophoretic electrodes comprising, based on solids:
- (a) 20-90% wt. silver particles;
(b) 0-75% wt. of silver chloride particles; and
(c) 5-15% wt. of a copolymer of hydrophilic and hydrophobic monomers wherein said hydrophilic monomer is selected from the group consisting of vinyl pyrrolidone, vinyl alcohol, vinyl methyl ether, hydroxyalkyl acrylate, hydroxyalkyl methacrylate, acrylamide and methacrylamide, and wherein said hydrophobic monomer is selected from the group consisting of vinyl chloride, vinylidene chloride, vinyl acetate, acrylonitrile, alkyl acrylate, alkyl methacrylate and styrene.
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Abstract
The invention is directed to a conductive composition for iontophoretic electrodes comprising, based on solids: (a) 20-90% wt finely divided particles of silver, carbon, graphite and mixtures thereof; (b) 0-75% wt. finely divided particles of silver chloride; (c) 0.25-10% wt. hydrophilic polymer; and (d) 2-15% wt. hydrophobic thermoplastic polymer having a glass transition temperature (Tg) >40° C. The invention is also directed to compositions wherein the binder comprises 5-15% wt. copolymer of hydrophilic and hydrophobic monomers.
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9 Claims
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1. A conductive composition for iontophoretic electrodes comprising, based on solids:
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(a) 20-90% wt. silver particles; (b) 0-75% wt. of silver chloride particles; and (c) 5-15% wt. of a copolymer of hydrophilic and hydrophobic monomers wherein said hydrophilic monomer is selected from the group consisting of vinyl pyrrolidone, vinyl alcohol, vinyl methyl ether, hydroxyalkyl acrylate, hydroxyalkyl methacrylate, acrylamide and methacrylamide, and wherein said hydrophobic monomer is selected from the group consisting of vinyl chloride, vinylidene chloride, vinyl acetate, acrylonitrile, alkyl acrylate, alkyl methacrylate and styrene. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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