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Discontinuously Coated Copper Wires

IP.com Disclosure Number: IPCOM000093552D
Original Publication Date: 1967-Nov-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Damm, EP: AUTHOR [+2]

Abstract

By electrophoresis techniques, copper wires are selectively coated with a dielectric material such as a copolymer of polytetrofluoroethylene and acrylonitrile butadiene. This is accomplished by taking steel vat 2 and filling it with electrolyte 4 which is a 60/40 by weight mixture of a suspension containing 61.0% by weight of polytetrofluoroethylene and a second suspension containing 41.0% by weight of acrylonitrile butadiene. Copper wire 6 is fed through diaphragm 8 into electrolyte 4 over rollers 10. In this arrangement, copper wire 6 is the anode and vat 2 is the cathode.

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Discontinuously Coated Copper Wires

By electrophoresis techniques, copper wires are selectively coated with a dielectric material such as a copolymer of polytetrofluoroethylene and acrylonitrile butadiene. This is accomplished by taking steel vat 2 and filling it with electrolyte 4 which is a 60/40 by weight mixture of a suspension containing
61.0% by weight of polytetrofluoroethylene and a second suspension containing
41.0% by weight of acrylonitrile butadiene. Copper wire 6 is fed through diaphragm 8 into electrolyte 4 over rollers 10. In this arrangement, copper wire 6 is the anode and vat 2 is the cathode.

With a constant voltage of about 10 volts and a current density of about 20 milliamperes, wire 6 is coated with the polymer mixture 12. At the completion of the electrophoretic deposition, the coated wire is dried by forced hot air or other heating sources. Following this, the coated wire can be sintered in a muffle furnace at 720 degrees F.

By shutting off the power at selected times, portions of the wire are left uncoated. Thus, the wire can be discontinuously coated by this method with any material which can be electrophoretically deposited.

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