Polymer compositions exhibiting a PTC property and methods...

Electric heating – Heating devices – With heating unit structure

Reexamination Certificate

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C338S0220SD

Reexamination Certificate

active

10993210

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/cm3and a mean thermal conductivity of less than about 5.0 W/m-° K.

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Corson, S.L., &

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