Resistance stable polymer positive temperature coefficient (pptc) material
AssigneeLittelfuse, Inc.
InventorsFlory Zhou, Wei Zheng, Qingbei Li, Jianhua Chen
Life of this patent
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Abstract
A resistance stable polymer positive temperature coefficient (PPTC) material is provided that can include a polymer matrix, a plurality of filler components disposed in the polymer matrix, and a plurality of carbon black particles bonded around each of the plurality of filler components to increase dispersion of the plurality of carbon black particles in the polymer matrix, thereby increasing a conductive volume of the polymer matrix and reducing a resistance variance in the polymer matrix.
Claims20
A polymer positive temperature coefficient (PPTC) material comprising:
- a polymer matrix;
- a plurality of filler components disposed in the polymer matrix;
- and
- a plurality of carbon black particles bonded around each of the plurality of filler components to increase dispersion of the plurality of carbon black particles in the polymer matrix, thereby increasing a conductive volume of the polymer matrix and reducing a resistance variance in the polymer matrix.
A method of preparing a polymer positive temperature coefficient (PPTC) material comprising:
- providing a polymer matrix with a resistivity of 10-10,000,000 Ohm-cm;
- disposing carbon black particles and filler components in the polymer matrix;
- and
- bonding a respective plurality of the carbon black particles around each of the filler components to increase dispersion of the carbon black particles in the polymer matrix, thereby increasing a conductive volume of the polymer matrix and reducing a resistance variance of the polymer matrix.
A polymer matrix comprising:
- a plurality of filler components;
- and
- a plurality of carbon black particles bonded around each of the plurality of filler components to increase dispersion of the plurality of carbon black particles in the polymer matrix, thereby increasing a conductive volume of the polymer matrix and reducing a resistance variance in the polymer matrix.
Dependencies are inferred from the claim text.