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Organic positive temp. coefficient semistor

A technology of positive temperature coefficient and thermistor, which is applied to the manufacture of resistors, resistors, and resistors with positive temperature coefficients, which can solve the problem of reduced resistance value and inability to obtain sufficient characteristics and rate of change of overcurrent and overheat protection elements. Difficulties and other problems, to achieve the effect of large resistance change rate, high reliability, and increased bulk density

Inactive Publication Date: 2003-12-10
TDK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if carbon-based particles are used to lower the non-operating resistance value, it is necessary to disperse a large amount of carbon-based particles in the matrix
Therefore, since it becomes difficult to sufficiently increase the rate of change of the resistance value, sufficient characteristics as an overcurrent and overheat protection element cannot be obtained.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Embodiment 1

[0079] Linear low-density polyethylene (manufactured by Mitsui Chemicals, Inc., trade name Eboriyu-sp2520, MFR: 1.7 g / 10 min, melting point: 121°C) synthesized in the gas phase using a metallocene catalyst was prepared as a high molecular weight organic compound, paraffin (Baker Petrolite, trade name Poly Wax655, melting point 99°C) as a low molecular weight organic compound, filamentous nickel powder (manufactured by INCO, trade name 210 type nickel powder, average particle size 0.5-1.0 μm, bulk density about 0.8 g / cm 3 , specific surface area 1.5 ~ 2.5m 2 / g) as metal powder, and carbon black (manufactured by Mitsubishi Chemical Corporation, trade name MA100, average particle diameter about 22 nm) as non-metal powder.

[0080] First, according to the method described in the above-mentioned JP-A-11-242812, the alkoxysilane solution and the metal particles are thoroughly mixed, then the surface of the metal particles is covered with the non-metal powder by adding the non-metal...

Embodiment 2

[0092] Except that the amount of non-metallic powder is 0.5% by mass of metal powder, the mixing ratio is 49% by volume of high-molecular organic compound, 6% by volume of low-molecular organic compound, and 45% by volume of metal powder covered with non-metallic powder. In the same manner as Example 1, a thermistor element was fabricated. Compared with the element of Example 1, this thermistor element has a larger content of metal powder and a smaller amount of non-metal powder relative to the amount of metal powder. About this element, the characteristic was measured similarly to Example 1.

[0093] As a result, the initial room temperature resistance was 7.0×10 -3 Ω (resistivity 5.7×10 -2 Ωcm), the resistance increases rapidly near 90°C, and the resistance change rate is about 11 digits. It is confirmed that a low room temperature resistance and a large resistance change rate can be obtained. In addition, for the difference in the initial room temperature resistance valu...

Embodiment 3

[0097] Except that the amount of non-metallic powder is 1.0% by mass of metal powder, the mixing ratio is 49% by volume of high-molecular organic compound, 6% by volume of low-molecular organic compound, and 45% by volume of metal powder covered with non-metallic powder. In the same manner as Example 1, a thermistor element was fabricated. Compared with the element of Example 1, this thermistor element has a larger content of metal powder and a smaller amount of non-metal powder relative to the amount of metal powder. About this element, the characteristic was measured similarly to Example 1.

[0098] As a result, the initial room temperature resistance was 8.0×10 -3 Ω (resistivity 6.5×10 -3 Ωcm), the resistance increases rapidly near 90°C, and the resistance change rate is about 11 digits. It is confirmed that a low room temperature resistance and a large resistance change rate can be obtained. In addition, for the difference in the initial room temperature resistance valu...

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Abstract

The aim of the invention is to suppress deterioration caused by preservation under adverse conditions of high temperature, high humidity, etc., in an organic positive temperature coefficient thermistor having a small room-temperature resistance value and a fully large change rate of the resistance value by using metal particles as conductive particles. This organic positive temperature coefficient thermistor has a thermistor element comprising a matrix containing a high polymer organic compound, and metallic particles. Nonmetallic powder composed of conductive nonmetallic particles is adhered to surfaces of the metallic particles. As nonmetallic particles, for example, carbon black is used.

Description

technical field [0001] The present invention relates to an organic positive temperature coefficient thermistor having a PTC (Positive Temperature Coefficient of Resistivity) characteristic that the resistance value increases with temperature rise, which can be used as a temperature sensor and an overcurrent protection element. Background technique [0002] Organic PTC thermistors in which conductive particles are dispersed in a matrix made of a crystalline polymer are known in this field, and are disclosed in US Pat. Nos. 3,243,753 and 3,351,882. The increase in the resistance value is considered to be due to the expansion of the crystalline polymer accompanying the melting, and the interruption of the conduction path formed by the row of conductive particles. [0003] Organic positive temperature coefficient thermistors can be used in overcurrent and overheating protection elements, self-control heating elements, temperature sensors, etc. As these required characteristics,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02H01C17/065
CPCH01C7/027H01C17/06586
Inventor 吉成由纪江繁田德彦
Owner TDK CORP
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