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Pressure sensitive electro-conductive materials

  • US 4,874,549 A
  • Filed: 04/26/1988
  • Issued: 10/17/1989
  • Est. Priority Date: 12/13/1985
  • Status: Expired due to Term
First Claim
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1. A process for the preparation of a pressure sensitive electro-conductive material comprising the steps of:

  • a. Preparing a solvent system comprising water, a water miscible carbon-wetting organic solvent, and a surfactant;

    b. Mixing finely divided electro-conductive carbon particles into the solvent system to form a uniform slurry;

    c. Maintaining the slurry for a predetermined period of time to obtain substantial wetting of the carbon particles of the solvent system to form a pre-agglomeration composition;

    d. Dispersing the pre-agglomeration composition into an aqueous elastomeric composition to form an elastomeric-carbon composition containing electrically conductive micro-agglomerates comprising unbound finely divided electro-conductive carbon particles enclosed by a matrix of elastomeric material and bound finely divided electro-conductive carbon particles; and

    e. Drying said elastomeric-carbon composition to obtain the pressure-sensitive electroconductive material.

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