Thick film conductor composition for use in biosensors
AssigneeE. I. Du Pont de Nemours and Company
InventorMan-Sheung Chan
Life of this patent
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Abstract
This invention is directed to a composition comprising: (a) platinum group metal powder, alloys, or mixtures thereof as a powder or deposited on graphite supports; (b) poly(glycol ether), derivatives, or mixtures thereof; (c) carbon-based electrically conductive filler; and (d) thermoplastic polymer or mixtures thereof. The invention is further directed to a process for dispersing platinum group metal powder, alloys, or mixtures thereof in poly(glycol ether), derivatives, or mixtures thereof. The invention is further directed to the above composition wherein the platinum group metal powder has been dispersed according to the above process.
Claims17
A composition consisting essentially of:
- (a) electrocatalyst selected from the group consisting of (1) platinum black and platinum group metal powders, alloys and mixtures thereof;
- (2) platinum group metals, alloys or mixtures thereof deposited on graphite support particles;
- or (3) mixtures of (1) and (2) wherein the surface area of said electrocatalyst is less than 150 m2/g;
- (b) carbon-based electrically conductive filler selected from the group consisting of graphite and mixtures of graphite and conductive carbon black;
- (c) a hydrophobic poly(glycol ether) material selected from the group consisting of a hydrophobic poly(glycol ethers)polymer, poly(tetramethylene glycol), poly(propylene glycol), hydrophobic copolymers of poly(gycol ether) with alkyl and carboxylated poly(glycol ether) and mixtures thereof;
- and
- (d) a thermoplastic polymer material;
- and;
- (e) an aromatic hydrocarbon solvent.
A process for dispersing platinum group metal powders, alloys, or mixtures thereof, wherein the surface area of said platinum group metal powders, alloys or mixtures thereof is less than 65 m2/g, comprising the steps of first mixing an electrocatalyst selected from the group consisting of (1) platinum black and platinum group metal powders, alloys and mixtures thereof;
- (2) platinum group metals, alloys or mixtures thereof deposited on graphite support particles;
- or (3) mixtures of (1) and (2) wherein the surface area of said electrocatalyst is less than 150 m2/g with;
- a hydrophobic poly(glycol ether) material dissolved in an aromatic hydrocarbon solvent wherein the hydrophobic poly(glycol ether) material selected from the group consisting of a hydrophobic poly(glycol ethers) polymer, poly(tetramethylene glycol), poly(propylene glycol), hydrophobic copolymers of poly(gycol ether) with alkyl and carboxylated poly(glycol ether) and mixtures thereof, and using a dispersing means to acheive a desired particle size.
Dependencies are inferred from the claim text.