Water-based silver-silver chloride compositions

• US 5,565,143 A
• Filed: 05/05/1995
• Issued: 10/15/1996
• Est. Priority Date: 05/05/1995
• Status: Expired due to Term

• Current Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Chan, Man-Sheung
• Primary Examiner(s): McGinty, Douglas J.
• Application Number:
  US08/435,250
• Time in Patent Office: 529 Days
• Field of Search: 252/514, 252/518, 252/511, 428/402, 428/425.9, 428/461, 428/469, 128/640
• US Class Current: 252/514
• CPC Class Codes: H01B 1/20 Conductive material dispersed in non-conductive organic material organic macromolecular compounds or compositions C08
• CPC Class Codes: H01B 1/22 the conductive material comprising metals or alloys

Abstract

The present invention relates to silver/silver chloride polymer compositions for use in making electrodes. The composition comprises:

(a) 3-15% water dispersible polymer wherein the polymer is an acrylic, urethane or blends;

(b) 25-95% Ag;

(c) 5-75% AgCl; and

wherein (a), (b), and (c) are dispersed in water and at least 1% wt. organic co-solvent.

Claims

1. A conductive composition consisting essentially of based on dry weight:

(a) 3-15% water dispersible polymer material with an acrylic polymer which is a grafted co-polymer with a polymer backbone having hydrophilic carboxylic acid pendant groups neutralized with alkyl amine and optionally polyurethane;

(b) 25-95% Ag;

(c) 5-75% AgCl; and

wherein (a), (b), and (c) are dispersed in water and at least 1% wt. organic co-solvent.

2. The composition of claim 1 wherein the weight ratio of Ag/AgCl has a range of 90/10 to 25/75.

3. The composition of claim 1 wherein the Ag is in the form of flake particles.

4. The composition of claim 1 wherein the urethane to acrylic ratio is in the range of 0 to 1 by weight of polymer solids.

5. The composition of claim 1 wherein the acrylic polymer is dispersed in water.

6. The composition of claim 1 further comprising a water soluble crosslinking agent.

7. The composition of claim 6 wherein the crosslinking agent is aziridine or melamine formaldehyde.

8. The composition of claim 1 wherein the co-solvent is within the range of 1-10%.

9. The composition of claim 1 wherein the Ag has a particle size range of 0.1 micron to 15 microns.

10. The composition of claim 1 wherein the AgCl has a particle size range of 0.1 micron to 15 microns.