Pressure-sensitive resistance elements

Details Pressure-sensitive resistance elements Pressure-sensitive resistance elements

1977-11-23

1979-03-20

Padgett, Benjamin R.

Compositions

Electrically conductive or emissive compositions

Free metal containing

252511, 252513, 252514, 252515, 252516, 252518, 338114, H01B 102

Patent

active

041453174

ABSTRACT:
An improved pressure-sensitive resistance element is provided which is composed of an electrically non-conductive matrix of a rubbery elastomer and electrically conductive particles dispersed therethrough to have a gradient of distribution from one side to the other of the matrix. Such resistance elements can be manufactured by preliminarily mixing a fluid silicone rubber composition with the conductive particles to be uniformly dispersed therein and subsequently subjecting the mixture to curing to form a rubbery elastomer while, concurrently, the particles are naturally or by force allowed to settle to form the gradient of distribution within the matrix.
The resistance elements are superior in easily obtaining the desired resistivity in a wide range by adjusting pressure applied thereto as well as a long service life, compared to products of the kind hitherto known.

REFERENCES:
patent: 3475213 (1969-10-01), Stow
patent: 3767519 (1973-10-01), Kojima et al.
patent: 4028276 (1977-06-01), Harden et al.
patent: 4054540 (1977-10-01), Michalchik

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