Positive temperature coefficient polymer composition and resettable fuse made therefrom

A positive temperature coefficient, polymer technology, applied in the direction of resistors with positive temperature coefficients, non-adjustable metal resistors, conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problem of breaking or burning of resettable protection devices And other issues

Inactive Publication Date: 2004-12-01
FUZETEC TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the applied voltage reaches the maximum voltage impedance, the resettable protection device will likely break or burn out

Method used

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Embodiment Construction

[0010] The positive temperature coefficient polymer composition of the present invention is particularly suitable for making circuit protection devices (for example, resettable protection devices with a volume resistance lower than 10 ohms / cm (especially lower than 5 ohms / cm) at 23° C.), It includes polymer mixture, conductive granular material dispersed in the polymer mixture and a voltage resistance enhancer. The polymer mixture contains (i) a crystalline grafted polymer, (ii) a crystalline ungrafted polymer and optionally (iii) a polymer formed from a crystalline ungrafted polymer and an ionized unsaturated carboxylic acid. ionic copolymer. The crystalline graft polymer is selected from grafted polyolefins, grafted polyolefin derivatives, and graft copolymers of polyolefins and polyolefin derivatives. The graft polymer is grafted via a polar group selected from carboxylic acid and its derivatives. The crystalline ungrafted polymer is selected from ungrafted polyolefins, u...

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Abstract

A PTC polymer composition contains a polymer mixture, a conductive particulate material, and a voltage resistance-enhancing agent of particulate metal oxide for enhancing voltage resistance of the polymer composition. The polymer mixture contains a crystalline grafted polymer and a crystalline non-grafted polymer.

Description

technical field [0001] The present invention relates to a positive temperature coefficient (PTC) polymer composition, in particular to a positive temperature coefficient polymer composition with improved voltage resistance and a resettable protection device made thereof. Background technique [0002] US Patent No. 6,238,598 discloses a positive temperature coefficient polymer composition comprising a crystalline grafted polymer and a crystalline ungrafted polymer. The addition of grafted polymers to the polymer composition enhances the properties of positive temperature coefficient devices made therefrom, such as tensile strength, low contact resistance, low initial resistance, high trip current, and high peak volume Impedance etc. [0003] U.S. Patent No. 6,359,053 discloses a positive temperature coefficient polymer composition comprising a crystalline grafted polymer, a crystalline ungrafted polymer, and an ionic polymer, which is a crystalline ungr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/22C08L23/04H01B1/00H01B1/24H01C7/02
CPCH01C7/027
Inventor 陈继圣古奇浩江长诚
Owner FUZETEC TECHNOLOGY CO LTD
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