Abstract: The flexible PTC heating element according to the invention has one of the following constitutions. A portion of an electrodes and a PTC resistor is impregnated into a flexible substrate. A flexible substrate is made of resin foam or rubber material having a concave/convex shape formed on the surface. The flexible PTC heating element has an elongation deformation portion disposed to at least one of an electrode and a PTC resistor. A flexible substrate has adhesiveness and either a flexible substrate or a flexible cover material has an elongation control portion. Therefore, the flexible PTC heating element is highly flexible and excellent in vibration durability.

Abstract: A heating element includes a base substrate, a pair of electrodes, a resistor capable of generating heat, a conductive resin, a terminal member, a hot melt adhesion metal, a hot melt cohesion metal, and a lead wire. The pair of electrodes is provided on the base substrate, and the resistor is formed between the pair of electrodes. The conductive resin is provided on each of the electrodes, and the terminal member is provided on the conductive resin. The adhesion metal is provided on the terminal member, and the cohesion metal forms a molten phase along with the adhesion metal. An end of the lead wire is welded to the cohesion metal. The conductive resin is provided in the vicinity of the adhesion metal so as to be affected by heat of the adhesion metal.

Abstract: The seating element has an electrically insulative substrate, a pair of electrodes disposed on the substrate, and a polymer resistor electrically connected to the electrodes. The polymer resistor includes resin composition cross-linked via one of oxygen atom and nitrogen atom, and at least one of fibrous conductor and flake-like conductor mixed in the resin composition.

Abstract: A heating element includes a base substrate, a pair of electrodes, a resistor capable of generating heat, a conductive resin, a terminal member, a hot melt adhesion metal, a hot melt cohesion metal, and a lead wire. The pair of electrodes is provided on the base substrate, and the resistor is formed between the pair of electrodes. The conductive resin is provided on each of the electrodes, and the terminal member is provided on the conductive resin. The adhesion metal is provided on the terminal member, and the cohesion metal forms a molten phase along with the adhesion metal. An end of the lead wire is welded to the cohesion metal. The conductive resin is provided in the vicinity of the adhesion metal so as to be affected by heat of the adhesion metal.

Abstract: The flexible PTC heating element according to the invention has one of the following constitutions. A portion of an electrodes and a PTC resistor is impregnated into a flexible substrate. A flexible substrate is made of resin foam or rubber material having a concave/convex shape formed on the surface. The flexible PTC heating element has an elongation deformation portion disposed to at least one of an electrode and a PTC resistor. A flexible substrate has adhesiveness and either a flexible substrate or a flexible cover material has an elongation control portion. Therefore, the flexible PTC heating element is highly flexible and excellent in vibration durability.

Abstract: The flexible PTC heating element according to the invention has one of the following constitutions. A portion of an electrodes and a PTC resistor is impregnated into a flexible substrate. A flexible substrate is made of resin foam or rubber material having a concave/convex shape formed on the surface. The flexible PTC heating element has an elongation deformation portion disposed to at least one of an electrode and a PTC resistor. A flexible substrate has adhesiveness and either a flexible substrate or a flexible cover material has an elongation control portion. Therefore, the flexible PTC heating element is highly flexible and excellent in vibration durability.

Abstract: The flexible PTC heating element according to the invention has one of the following constitutions. A portion of an electrodes and a PTC resistor is impregnated into a flexible substrate. A flexible substrate is made of resin foam or rubber material having a concave/convex shape formed on the surface. The flexible PTC heating element has an elongation deformation portion disposed to at least one of an electrode and a PTC resistor. A flexible substrate has adhesiveness and either a flexible substrate or a flexible cover material has an elongation control portion. Therefore, the flexible PTC heating element is highly flexible and excellent in vibration durability.

Abstract: A self-regulating heating article includes a first elongate layer formed by a crystalline polymeric composition of high crystallinity and conductive particles dispersed in the polymeric composition to exhibit a positive temperature coefficient of resistance. A pair of elongate electrodes, which are adapted for connection to a power supply, are secured one on each surface of the first layer to develop a potential in the direction of thickness of the first layer. The electrodes are arranged so that a creeping distance which is greater than the thickness of the first layer is established between the electrodes along peripheral edges thereof. The creeping distance prevents insulation breakdown and ensures safe, high wattage operation at power supply voltages.

Abstract: A self-regulating heating article comprises a first elongate layer formed by a crystalline polymeric composition of high crystallinity and conductive particles dispersed in the polymeric composition to exhibit a positive temperature coefficient of resistance. A pair of elongate electrodes, which are adapted for connection to a mains supply, are secured one on each surface of the first layer to develop a potential in the direction of thickness of the first layer. The electrodes are arranged so that a creeping distance which is greater than the thickness of the first layer is established between the electrodes along peripheral edges thereof. The creeping distance prevents insulation breakdown and ensures safe, high wattage operation at mains voltages.

Abstract: A method of making an electrically conductive polymeric composite, comprising the steps of crosslinking a first organic binder having a functional group to carbon black having a functional group so as to form a composition, fractionizing the composition, mixing the fractionized composition with the first organic binder or a second organic binder so as to form a mixture; and annealing the mixture.

Abstract: This invention provides a PTC heating wire (12), (13) of a tubular or band form which comprises a pair of electrodes (2), (2'), a PTC resistor (3) provided between the electrodes, and an insulative sheath (4) covering the electrodes and resistor, in which a numerical formula for setting a resistance, R.sub.E, within a tolerance range including an optimum resistance value is first determined. In practice, the resistance, R.sub.E, of the electrodes (2), (2') is properly determined, according to use conditions, using the numerical formula, thereby obtaining a PTC heating wire which ensures safe service.

Abstract: An electrically heated hair curling iron includes a sheet-shaped heater with electrodes affixed to an electrically resistive layer, wrapped around an elongated cylindrical support, and capable of being rapidly heated and maintained hot by electric current available from a rechargeable storage battery. The resistive layer has a positive temperature coefficient of resistance so that its temperature is self limiting. The storage battery is contained in a handle attached to the cylindrical support, and a battery charger is disclosed which comes into electrical contact with the battery when the handle is inserted in a cavity located in the battery charger. An elongated longitudinal clip is used to retain the hair in contact with the heater; a removable cap protects the heater and clip when the iron is not in use, and also engages a switch which ensures that the iron does not remain on.