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Positive temperature coefficient materials with reduced negative temperature coefficient effect

A technology of positive temperature coefficient and melting temperature, applied in the direction of resistors with positive temperature coefficient, non-adjustable metal resistors, resistors, etc., can solve the problems of increasing PTC material time and production cost, affecting PTC amplitude, disadvantages, etc.

Inactive Publication Date: 2012-07-18
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Crosslinking in the melt also eliminates the NTC effect but adversely affects the PTC amplitude
Also, the step of cross-linking the material increases the time and production cost of making the PTC material

Method used

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  • Positive temperature coefficient materials with reduced negative temperature coefficient effect
  • Positive temperature coefficient materials with reduced negative temperature coefficient effect
  • Positive temperature coefficient materials with reduced negative temperature coefficient effect

Examples

Experimental program
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Embodiment

[0090] The invention will now be illustrated in more detail with reference to the following specific non-limiting examples. All percentages are by weight unless otherwise indicated.

[0091] The PTC materials were compounded on a Werner and Pfleiderer 25 mm co-rotating 10-barrel twin-screw extruder. All ingredients are fed at the feed throat. The inlet zone was set at 50°C, the first heating element was set at 100°C, and the second heating element was set at 150°C. For #4, the other heating elements as well as the die were set at 190°C. For #1, #9 and #11, the other heating elements as well as the die were set at 210°C. For materials containing PBT (#5 and #6), the other heating elements as well as the die were set at 250°C. For materials comprising PA6 (formulations #10 and #12), the second heating element was set at 150°C and the other heating elements as well as the die were set at 250°C. For materials comprising PA66 (formulations #2, #3, #7 and #8), the second heatin...

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Abstract

Positive temperature coefficient (PTC) compositions having a reduced negative temperature coefficient effect (NTC) are provided that are achieved without crosslinking the thermoplastic base material. The PTC compositions include a thermoplastic base resin, an electrically conductive filler and particles of a polymeric additive dispersed in the PTC composition.

Description

technical field [0001] The present invention relates to positive temperature coefficient compositions, articles of manufacture comprising the positive temperature coefficient compositions, and methods of making articles comprising the positive temperature coefficient compositions. In particular, the present invention relates to positive temperature coefficient compositions having reduced negative temperature coefficient effects. Background technique [0002] It is known that polymers can be made into conductive substances by dispersing therein an appropriate amount of conductive particulate fillers such as carbon black or fine metal particles. In recent years, particular attention has been paid to compositions which exhibit positive temperature coefficient (PTC) properties, ie which exhibit a rapid increase in electrical resistivity within a certain temperature range interval. [0003] PTC materials are conductive materials, characterized in that when the switching temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02H01C17/065C08L23/06C08K3/04C08L77/02C08L77/06
CPCH01C7/027C08K3/04C08L77/02C08L23/06C08L77/06H01C17/06586C08L23/04C08L2666/20H01C7/02H01C17/065
Inventor F.P.M.莫克斯S.J.特霍斯特
Owner SABIC GLOBAL TECH BV
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