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US 2006/0049385 A1Published application
Ptc material and method for producing same, and circuit protection part using such ptc material and method for manufacturing same
OwnerHideki Tanaka, Koichi Morimotoinventors
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Abstract
Provided is a polymeric PTC material having excellent PTC characteristics and a low room temperature resistivity at the same time. In the polymeric PTC material comprising a polymer and carbon black, the carbon black has a ratio of DBP absorption to C-DBP absorption of greater than 1.0 but not greater than 1.1.
Claims7
A polymeric PTC material comprising:
- a polymer and carbon black, wherein
- the carbon black has a ratio of DBP absorption to C-DBP absorption of greater than 1.0 but not greater than 1.1.
A method for producing a polymeric PTC material comprising a polymer and carbon black, the method comprising the step of:
- dispersing the carbon black in the polymer in such a manner that the carbon black has a ratio of DBP absorption to C-DBP absorption of greater than 1.0 but not greater than 1.1.
Dependencies are inferred from the claim text.