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Reversible Electrophoresis

IP.com Disclosure Number: IPCOM000093553D
Original Publication Date: 1967-Nov-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Cornish, BE: AUTHOR [+3]

Abstract

A mixture of polytetrafluoroethylene and acrylonitrile butadiene copolymer is deposited and redispersed by a reversible electrophoretic process. Copper wire 2 is positioned in stainless steel vat 4. Power source 6 is then coupled to each of these so that wire 2 and vat 4 each act as an electrode. The cell is completed with electrolyte 8, which is a dispersion of the polymer mixture indicated.

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Reversible Electrophoresis

A mixture of polytetrafluoroethylene and acrylonitrile butadiene copolymer is deposited and redispersed by a reversible electrophoretic process. Copper wire 2 is positioned in stainless steel vat 4. Power source 6 is then coupled to each of these so that wire 2 and vat 4 each act as an electrode. The cell is completed with electrolyte 8, which is a dispersion of the polymer mixture indicated.

The electrodes are first cleaned with tricholorethylene before immersion in electrolyte 8. Wire 2 and vat 4 are connected as anode and cathode, respectively, to power supply 6 for a specific length of time to permit the electrophoretic deposition of the copolymer on wire 2. The polarity of the electrodes is then reversed and the electrophoretic deposit is redistributed in the electrolyte.

In this process, when the copper electrodes act as the anode, copper ions are generated at the electrode surface inducing flocculation of the dispersed polymer mixture. Continued growth of the film on the copper electrode then depends on the presence of copper ions at the film-dispersion interface.

When the polarity of the electrodes is reversed, the copper ions are reduced back to the metallic form at the copper electrode surface. This results in the removal of the electrolyte and causes the organic film to redisperse.

Such a technique finds application in the selective stripping of freshly coated wires.

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