Pressure-sensitive electrically conductive elastomeric composition
First Claim
1. A pressure-sensitive, electrically conductive elastomeric composition consisting essentially of a substrate composed of an organic flexible material and electrically conductive particles incorporated and dispersed therein, wherein said electrically conductive particles are angle-chipped, roundish pebble-like particles of artificial graphite having:
- (a) a Wadell roundness of at least 0.7;
(b) a size passable through a sieve having a mesh size of 180 μ
m but not passable through a sieve having a mesh size of 40 μ
m; and
(c) a particle size distribution such that the ratio of the size of the minimum particle to the size of the maximum particle is in the range of 1;
1 to 1;
1.7.
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Accused Products
Abstract
Disclosed is a pressure-sensitive, electrically conductive elastomeric composition comprising a substrate composed of an organic flexible material and electrically conductive particles consisting of angle-chipped, roundish pebble-like particles of artificial graphite incorporated and dispersed therein. An elastomeric material comprising this composition has such a characteristic property that the electric resistivity is conspicuously and gradiently reduced under application of a pressure from the level maintained when no pressure is applied. This characteristic property is very durable and therefore, the material can be used advantageously for switch elements and the like.
86 Citations
6 Claims
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1. A pressure-sensitive, electrically conductive elastomeric composition consisting essentially of a substrate composed of an organic flexible material and electrically conductive particles incorporated and dispersed therein, wherein said electrically conductive particles are angle-chipped, roundish pebble-like particles of artificial graphite having:
- (a) a Wadell roundness of at least 0.7;
(b) a size passable through a sieve having a mesh size of 180 μ
m but not passable through a sieve having a mesh size of 40 μ
m; and
(c) a particle size distribution such that the ratio of the size of the minimum particle to the size of the maximum particle is in the range of 1;
1 to 1;
1.7. - View Dependent Claims (2, 3, 4, 5, 6)
- (a) a Wadell roundness of at least 0.7;
Specification