PTC conductive polymer composition containing carbon black having large particle size and high DBP absorption
First Claim
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1. 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.
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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.
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46 Claims
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1. A conductive polymer composition exhibiting positive temperature coefficient behavior and an improved breakdown voltage property, comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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Specification