Electrical conductive organopolysiloxane elastomers

Details Electrical conductive organopolysiloxane elastomers Electrical conductive organopolysiloxane elastomers

C - Chemistry, Metallurgy

08

K

31/158, 400/5146

C08K 3/04 (2006.01) C08L 83/04 (2006.01) H01B 1/24 (2006.01) H01B 3/00 (2006.01)

Patent

CA 1121997

ABSTRACT OF THE DISCLOSURE A composition is provided herein which, when cured, provides an elastomer capable of conducting electrically. It contains a particular class of cross-linkable organopolysiloxane and an electrically conductive lamp black. The electrically conductive lamp black comprises from 15 to 60 percent by weight, based on the weight of the organopolysiloxane, of furnace black having a surface area of from 40 to 100 m2/g, and from 5 to 25 percent by weight of acetylene black, based on the weight of the organopolysiloxane. The electrical resistance of the elastomer increases substantially faster with increasing temperatures, i.e., they exhibit a so-called PTC behaviour. Since the steep increase in electrical resis- tance which takes place at lower temperatures can be predetermined, it is possible to attain a higher specific power density.

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