Polymer composites for overvoltage protection
First Claim
Patent Images
1. A composition for providing protection against electrical overstress, the composition comprising:
- an insulating binder;
conductive particles having an average particle size of less than 10 microns, said conductive particles being spaced by a distance of approximately 1000 angstroms or greater; and
semiconductive particles having an average particle size of less than 10 microns.
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Accused Products
Abstract
A composition and devices utilizing these compositions for providing protection against electrical overstress including a matrix formed of a mixture of an insulating binder, conductive particles having an average particle size of less than 10 microns, and semiconductive particles having an average particle size of less than 10 microns. The compositions exhibit improved clamping voltages in a range of about 30 volts to greater than 2,000 volts.
173 Citations
27 Claims
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1. A composition for providing protection against electrical overstress, the composition comprising:
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an insulating binder;
conductive particles having an average particle size of less than 10 microns, said conductive particles being spaced by a distance of approximately 1000 angstroms or greater; and
semiconductive particles having an average particle size of less than 10 microns. - View Dependent Claims (2, 3, 4, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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- 5. The composition of 1 wherein the insulating binder comprises a silicone resin.
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17. A composition for providing protection against electrical overstress, the composition comprising:
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an insulative binder;
conductive particles having an average particle size of less than 10 microns;
semiconductive particles having an average particle size of less than 10 microns; and
insulative particles having an average particle size in a range of about 200 angstroms to about 1,000 angstroms. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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26. A device for protecting against electrical overstress, the device comprising a pair of electrodes electrically connected by a composition, the composition comprising:
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an insulating binder;
conductive particles having an average particle size of less than 10 microns and a bulk conductivity of greater than 10 (ohm cm)−
1; and
semiconductive particles having an average particle size of less than 10 microns and a bulk conductivity in a range of 10 to 10−
6 (ohm cm)−
1.
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27. A device for protecting against electrical overstress, the device comprising a pair of electrodes electrically connected by a composition, the composition comprising:
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an insulating binder;
conductive particles having an average particle size of less than 10 microns and a bulk conductivity of greater than 10 (ohm cm)−
1;
semiconductive particles having an average particle size of less than 10 microns and a bulk conductivity in a range of 10 to 10−
6 (ohm cm)−
1; and
insulative particles having an average particle size in a range of about 200 angstroms to about 1,000 angstroms and a bulk conductivity less than 10−
6 (ohm cm)−
1.
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Specification