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Conductive positive temperature coefficient polymer composition and circuit protection device made therefrom

A technology of conductive polymers and positive temperature coefficients, applied in the direction of conductive materials dispersed in non-conductive inorganic materials, circuits, resistance manufacturing, etc., can solve problems such as poor resistance stability, and achieve the effect of excellent resistance stability

Inactive Publication Date: 2008-04-02
FUZETEC TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the general conductive polymers disclosed in the aforementioned patents containing polyvinylidene fluoride irradiated at a dose of 10 Mrads have relatively poor resistance stability

Method used

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  • Conductive positive temperature coefficient polymer composition and circuit protection device made therefrom

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Embodiment Construction

[0011] Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:

[0012] The positive temperature coefficient element of the present invention is particularly useful in making a positive temperature coefficient protection device having a resistivity lower than 10 ohm-cm at 20°C, the positive temperature coefficient element having a positive temperature coefficient polymer composition, and the The positive temperature coefficient polymer composition comprises: a non-crosslinked polyvinylidene fluoride (PVDF) accounting for 40-70 volume percent or crosslinked by irradiating the non-crosslinked polyvinylidene fluoride with a dose lower than 8Mrads The formed cross-linked polyvinylidene fluoride, and a particle conductive filler accounting for 30-50 volume percent. The non-crosslinked polyvinylidene fluoride has a melt flow rate lower than 120 g / 10 min.

[0013] Preferably, the cross-linked polyvinylidene fluoride is formed by ir...

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Abstract

A PTC circuit protection device has a resistivity at 20 DEG 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.

Description

technical field [0001] The present invention relates to a kind of positive temperature coefficient (PTC, positive temperature coefficient) polymer composition, relate in particular to a kind of containing non-cross-linked polyvinylidene fluoride (non-cross-linked polyvinylidene fluoride) or because it is lower than 8Mrads Dose irradiation of the formed cross-linked (cross-linked) PTC polymer composition of polyvinylidene fluoride. The present invention also relates to a circuit protection device made of the PTC polymer composition. Background technique [0002] Existing PTC devices made from conductive polymer compositions require cross-linking to avoid undesired negative temperature coefficient effects during operation. For example, in order to prevent PTC components from burning or damage, polyolefin based PTC compositions are usually cross-linked at a dose of at least 10Mrads but not more than 150Mrads, preferably from 25Mrads to 125Mrads, more preferably It is from 50M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K3/04H01B1/24
CPCH01C7/027H01C17/06586
Inventor 陈继圣古奇浩
Owner FUZETEC TECHNOLOGY CO LTD