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Browse Prior Art Database

Conductive Materials in a Resistive Ribbon

IP.com Disclosure Number: IPCOM000053172D
Original Publication Date: 1981-Sep-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Chang, LS: AUTHOR [+2]

Abstract

One problem of the implementation of high solid formulations of resistive ribbon coatings has been the very high level of viscosity. It is very difficult, if not impossible, to use conventional coating techniques to obtain a thin (less than a mil) uniform coating film from high viscosity formulations. A thin uniform coating is mandatory for a good resistive ribbon.

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Conductive Materials in a Resistive Ribbon

One problem of the implementation of high solid formulations of resistive ribbon coatings has been the very high level of viscosity. It is very difficult, if not impossible, to use conventional coating techniques to obtain a thin (less than a mil) uniform coating film from high viscosity formulations. A thin uniform coating is mandatory for a good resistive ribbon.

The high solid formulations, either radiation-cured or water-borne, are desired because the increasingly stringent environmental regulations call for these approaches.

In the past, we have found that in order to meet the functional requirements of a good ribbon, the resistive layer must have a resistivity in the neighborhood of
0.5 ohm-cm. This calls for the addition of high specific surface conductive material, such as XC-72 by Cabot Corporation, to the resistive resin binder in the amount about 30% by weight. For solvent-dispersed formulation and conventional coating, this presented no problem. However, for high solid formulations, the resulting increase in viscosity is tremendous such that coating by a conventional technique is nearly impossible.

Conductive material such as graphite has very low specific surface compared to XC-72 and gives much lower viscosity, but also gives much lower conductivity at the same level of addition to the polymer binder.

By combining the high specific surface material, such as XC-72 or Sterling SO, with low specific surface ma...