Polymer compositions exhibiting a PTC property and methods of fabrication
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United States of America Patent
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Dec 18, 2007
Grant Date -
Jan 5, 2006
app pub date -
Nov 18, 2004
filing date -
Nov 19, 2003
priority date (Note) -
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Abstract
Various embodiments of the invention provide polymeric compositions including PTC composites that exhibit highly non-linear PTC effects together with extremely rapid, repeatable switching within a predetermined temperature range. In one embodiment, the polymer composite includes a polymer base material with dispersed conductive particles that have very low densities and very low thermal conductivity properties. The conductive particle component can comprise hollow glass microspheres to provide low mass and low thermal conductivity properties together with a nanoscale conductive cladding of silver or gold. The conductively clad microspheres have a core portion with a bulk density of less than about 2.0 g/cm.sup.3 and a mean thermal conductivity of less than about 5.0 W/m-.degree. K.
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