Conductive positive temperature coefficient polymer composition and circuit protection device made therefrom
AssigneeFuzetec Technology Co., Ltd.
InventorsJack Jih-Sang Chen, Chi-Hao Gu
Life of this patent
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Abstract
A PTC circuit protection device has a resistivity at 20° C. of less than 10 ohm-cm and is made from a PTC polymer composition that contains: 40-70 vol % of a non-cross-linked polyvinylidene fluoride (PVDF) or a cross-linked polyvinylidene fluoride formed by cross-linking the non-cross-linked polyvinylidene fluoride by irradiation to a dosage less than 8 Mrads; and 30-60 vol % of a particulate conductive filler. The non-cross-linked polyvinylidene fluoride has a melting flow rate (MFR) of less than 120 g/10 min.
Claims22
A positive temperature coefficient (PTC) polymer composition comprising:
- non-cross-linked polyvinylidene fluoride having a melting flow rate of less than 120 g/10 min;
- and
- a particulate conductive filler.
A positive temperature coefficient (PTC) polymer composition comprising:
- cross-linked polyvinylidene fluoride formed by cross-linking a non-cross-linked polyvinylidene fluoride by irradiation to a dosage less than 8 Mrads;
- and
- a particulate conductive filler;
- wherein said non-cross-linked polyvinylidene fluoride has a melting flow rate of less than 120 g/10 min.
A circuit protection device having a resistivity at 20° C. of less than 10 ohm-cm, said circuit protection device comprising:
- a conductive polymer element exhibiting positive temperature coefficient and having a PTC polymer composition containing non-cross-linked polyvinylidene fluoride having a melting flow rate of less than 120 g/10 min, and a particulate conductive filler;
- and
- two electrodes connected to said conductive polymer element and adapted to receive electrical power so as to cause current to flow through said conductive polymer element.
A circuit protection device having a resistivity at 20° C. of less than 10 ohm-cm, said circuit protection device comprising:
- a conductive polymer element exhibiting positive temperature coefficient and having a PTC polymer composition containing cross-linked polyvinylidene fluoride and a particulate conductive filler, said cross-linked polyvinylidene fluoride being formed by cross-linking a non-cross-linked polyvinylidene fluoride by irradiation to a dosage less than 8 Mrads, said non-cross-linked polyvinylidene fluoride having a melting flow rate of less than 120 g/10 min;
- and
- two electrodes connected to said conductive polymer element and adapted to receive electrical power so as to cause current to flow through said conductive polymer element.
Dependencies are inferred from the claim text.