Over-current protection device and manufacturing method thereof
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United States of America Patent
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Issued Date -
Mar 15, 2007
app pub date -
Jun 7, 2006
filing date -
Sep 15, 2005
priority date (Note) -
Abandoned
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Abstract
An over-current protection device comprises a chemically cross-linked positive temperature coefficient (PTC) layer and two electrode foils that can be connected to a power source to allow current to flow through the chemically cross-linked polymeric PTC layer. The chemically cross-linked polymeric PTC layer comprises at least two different PTC polymer layers, and each polymer layer comprises polymer and conductive filler and has a volumetric resistivity between 10.sup.-1 and 10.sup.-3 .OMEGA.-cm. The polymer layers have different functional groups and are alternately stacked and hot pressed to generate chemical cross-linking therebetween so as to form the chemically cross-linked polymeric PTC layer, wherein the potential difference of every 0.1 mm in thickness of the chemically cross-linked polymeric PTC layer is less than 30 volts.
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