PTC conductive polymer composition containing carbon black having large particle size and high DBP absorption
AssigneeFujikura Ltd.
InventorsMakoto Yamada, Setsuya Isshiki, Yukihiko Kurosawa
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Abstract
A conductive polymer composition exhibiting positive temperature coefficient behavior comprising: (a) a crystalline polymer having dispersed therein (b) carbon black having an average particle diameter of at least about 60 millimicrons and a DBP absorption of at least about 80 cc/100 g. Circuit protection devices containing a thin layer of this conductive polymer composition between laminar electrodes provide high breakdown voltage in combination with very low resistance and are useful for protecting high-current/high voltage battery-powered devices.
Claims46
A conductive polymer composition exhibiting positive temperature coefficient behavior and an improved breakdown voltage property, comprising:
- (a) a crystalline polymer having a crystallinity of about 10 to 98 percent and having dispersed therein
- (b) carbon black having an average particle diameter of from about 80 to 110 millimicrons and a DBP absorption of from about 110 to 140 cc/100 g,
- wherein said composition comprises 100 parts by weight of said crystalline polymer and 40 to 150 parts by weight of said carbon black.
Dependencies are inferred from the claim text.