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Cable Insulation Coatings Via Electrophoresis

IP.com Disclosure Number: IPCOM000077716D
Original Publication Date: 1972-Sep-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Washo, BD: AUTHOR

Abstract

Wires may be coated with substantial thickness insulation by electrophoretic deposition of dielectric material, from aqueous codispersion formulations of blended hard and soft polymer latices. Such deposits generally require removal of the soft component by drying and sintering or firing treatments, in order to obtain desired electrical characteristics. However, it has been found that the soft polymer constituent in such systems may degrade to a particulate resin, before the hard polymer melts and fuses, thereby leaving voids and "pockets" resulting in nonhomogeneous coatings of poor insulation quality.

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Cable Insulation Coatings Via Electrophoresis

Wires may be coated with substantial thickness insulation by electrophoretic deposition of dielectric material, from aqueous codispersion formulations of blended hard and soft polymer latices. Such deposits generally require removal of the soft component by drying and sintering or firing treatments, in order to obtain desired electrical characteristics. However, it has been found that the soft polymer constituent in such systems may degrade to a particulate resin, before the hard polymer melts and fuses, thereby leaving voids and "pockets" resulting in nonhomogeneous coatings of poor insulation quality.

This problem can be eliminated by adding to the initial codispersion formulation, one or more latices of polymer material(s) subject to melting and fusion at temperature(s) above the film forming temperature of the soft polymer component and below the melting or softening point of the hard polymer constituent. Such intermediate polymer component(s), which should be within the same generic family for best effectiveness and compatibility, fills the voids left by the pyrolyzed soft component and supplies properties of a binder for the coating matrix. Therefore, for a given coating, a less soft component would be required in the initial formulation. A programmed drying and sintering thermal cycle is required in order to initiate film-forming of each respective material component. An exemplary formulation of a fluorocarbon...