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PTC conductive composition containing a low molecular weight polyethylene processing aid

A low-molecular-weight polyethylene, processing aid technology, applied in resistors with positive temperature coefficients, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the adverse effects of cost and voltage control ability, raw materials can be Problems such as adverse effects on processability

Inactive Publication Date: 2007-10-17
热力蒂思科有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when these substances significantly improve the stability of resistance, the latter two items will have an adverse effect on the processability of raw materials
Using a higher cure state will adversely affect the cost and voltage capability of the device

Method used

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  • PTC conductive composition containing a low molecular weight polyethylene processing aid
  • PTC conductive composition containing a low molecular weight polyethylene processing aid
  • PTC conductive composition containing a low molecular weight polyethylene processing aid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] Table 1. Recipe (based on phr)

[0035] 1 Mn is 18,000; Mw is 143,000; MWD is 7.94; MP is 106.

[0036] 2 Mn is 3,000; Mw is 10,000; MWD is 3.13; MP is 107.

[0037] 3 Mn is 5,500; Mw is 15,000; MWD is 2.73; MP is 115.

[0038] MP is the peak melting temperature determined by DSC.

[0039] Control A

Control B

example 1

Example 2

Electricity

to press

control

system

can

force

Chip thickness

(inch)

0.0100

0.0103

0.0103

0.0104

Device resistance

milliohms (room temperature)

7.27

7.02

7.66

7.39

Voltage control capability

(DC)

38

40

40

38

Electricity

block

Steady

Certainly

sex

(3,000 cycles; 10.5 volts; 20amps;

40 seconds on; 70 seconds off)

% change in resistance

51.7

61.9

48.0

...

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PUM

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Abstract

The invention provides polymeric PTC compositions and electrical PTC devices with higher voltage capability and improved electrical stability. The PTC compositions of the present invention exhibit improved processability and include at a minimum an organic polymner, a conductive filler and a low molecular weight polyethylene processing aid. Depending on device design, the composition can be used in low to high voltage applications.

Description

technical field [0001] The present invention generally relates to polymeric positive temperature coefficient (PTC) compositions and PTC electrical PTC devices. In particular, the present invention relates to polymeric PTC compositions containing low molecular weight polyethylene processing aids, which are suitable for use at high temperatures. Background technique [0002] It is well known in the electronics industry that electrical devices containing conductive polymer compositions exhibit the PTC effect and have many applications, including, as non-limiting examples, use as thermostatic heaters, thermosensitive elements, low power circuit protectors and Overcurrent regulators and live voltage devices for installations. A typical conductive polymer PTC composition comprises a crystalline matrix or a semi-crystalline thermoplastic resin (e.g. polyethylene) matrix or an amorphous thermosetting resin (e.g. epoxy resin) matrix including dispersed conductive fillers such as car...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B1/24H01C7/02H01C8/00C08K3/04C08L101/00H01C17/065
CPCH01C17/06586H01B1/24H01C7/027
Inventor 爱德华·J·布洛克杰弗里·A·韦斯特
Owner 热力蒂思科有限公司