Pressure sensitive conductor
AssigneeJapan Synthetic Rubber Co., Ltd.
InventorsTeizo Kotani, Masaki Nagato, Kozo Arai
Life of this patent
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Abstract
A pressure sensitive conductor consists essentially of (I) an electrically insulating rubber (excluding addition reaction type liquid silicone rubber), (II) 25 to 50% by volume of electrically conductive metal particles (preferably 40 to 200.mu. in particle size) and (III) 5 to 20% by volume of carbon black, and having a JIS A hardness of at least 40. Said conductor may optionally contain (IV) 0.1 to 5% by volume of a mono-, di- or trialkyl titanate. This pressure sensitive conductor has high mechanical strength, a rapid electrical response to deformations, a low hysteresis of the electrical resistance variation on application and release of pressure, and minimized change of the pressure-resistivity curve under repeated deformations.
Claims11
A pressure sensitive conductor comprising (I) an electrically insulating rubber, (II) 25 to 50% by volume, based on the volume of the pressure sensitive conductor, of particles of a conductive metal selected from the group consisting of silver, copper, cobalt, platinum, gold, nickel, iron, chromium, titatium, zinc, and alloys and oxides thereof, and (III) 5 to 20% by volume, based on the volume of the pressure sensitive conductor, of carbon black, said conductor having JIS A hardness of 40 or more said rubber being moldable in the presence of the carbon black.
A pressure sensitive conductor according to coaim 1, 7, 3 or 4 wherein the component (I) is selected from the group consisting of natural rubber, polybutadiene rubber, polyisoprene rubber, styrene-butadiene copolymer rubber, ethylene-propylene copolymer rubber, ethylene-propylene-diene copolymer rubber, silicone rubber other than addition reaction type liquid silicone rubber, polyurethane rubber, butyl rubber, acrylonitrilebutadiene copolymer rubber, acrylic rubber and chloroprene rubber.
Dependencies are inferred from the claim text.