-
公开(公告)号：WO9630443A3
公开(公告)日：1996-11-21
申请号：PCT/US9603475
申请日：1996-03-15
Applicant: RAYCHEM CORP
Inventor： WARTENBERG MARK F , LAHLOUH JOHN G , TOTH JAMES
CPC classification number: H01C7/027 , Y10S428/901 , Y10T428/24917 , Y10T428/24926
Abstract: A conductive polymer composition which has a resistivity at 20 °C of at most 1.0 ohm-cm and a PTC anomaly of at least 104 contains at most 64 % by volume of a crystalline polymeric component and at least 36 % by volume of a particulate conductive filler. A preferred conductive filler is carbon black having a DBP number of 60 to 120 cm3/100 g. Compositions of the invention, as well as other conductive polymer compositions, are preferably prepared by a method in which the polymeric component and the filler are blended in a first step at a temperature greater than the melting temperature of the polymer, the mixture is then cooled, and the mixture is then mixed in a second step. The resulting composition has a PTC anomaly that is at least 1.2 times the PTC anomaly of the first mixture.
-
Patent Agency Ranking
公开(公告)号：CA2215959A1
公开(公告)日：1996-09-26
申请号：CA2215959
申请日：1996-03-15
Applicant: RAYCHEM CORP
Inventor： TOTH JAMES , BANNICK MARK , WARTENBERG MARK F
IPC: H01C7/02
Abstract: An electrical device (1) in which a resistive element (3) composed of a conductive polymer composition and two electrodes (5, 7) is made by a method in which the device is cut from a laminate (9) of the conductive polymer composition and the electrodes, is exposed to a thermal treatment at a temperature above the melting temperature of the conductive polymer composition, and is then cross-linked. The device has improved PTC anomaly over devices prepared by a conventional method in which cross-linking occurs before the cutting step.
-
公开(公告)号：CA2215903A1
公开(公告)日：1996-10-03
申请号：CA2215903
申请日：1996-03-15
Applicant: RAYCHEM CORP
Inventor： TOTH JAMES , LAHLOUH JOHN G , WARTENBERG MARK F
IPC: H01C7/02
Abstract: A conductive polymer composition which has a resistivity at 20 ~C of at most 1.0 ohm-cm and a PTC anomaly of at least 104 contains at most 64 % by volume of a crystalline polymeric component and at least 36 % by volume of a particulate conductive filler. A preferred conductive filler is carbon black having a DBP number of 60 to 120 cm3/100 g. Compositions of the invention, as well as other conductive polymer compositions, are preferably prepared by a method in which the polymeric component and the filler are blended in a first step at a temperature greater than the melting temperature of the polymer, the mixture is then cooled, and the mixture is then mixed in a second step. The resulting composition has a PTC anomaly that is at least 1.2 times the PTC anomaly of the first mixture.
-
公开(公告)号：MX9606207A
公开(公告)日：1998-06-30
申请号：MX9606207
申请日：1996-12-06
Applicant: RAYCHEM CORP
Inventor： ZHANG MICHAEL , THOMPSON MARK S , TOTH JAMES , BEADLING WILLIAM CARDWELL
Abstract: Los dispositivos eléctricos, particularmente los dispositivos de proteccion de circuito, contienen elementos poliméricos conductores cuyas orillas se forman rompiendo el elemento polimérico conductor, a lo largo de una trayectoria deseada, sin la introduccion de un cuerpo solido en el elemento. La falla cohesiva resultante del polímero conductor produce una superficie fracturada distintiva. Un método para preparar estos dispositivos involucra grabar canales de fractura en los electrodos de una placa que contiene un elemento polimérico conductor de un coeficiente de temperatura positivo, emparedado entre electrodos de lámina metálica, y luego ajustar instantáneamente la placa a lo largo de los canales de fractura para formar dispositivos individuales. La figura ilustra un dispositivo de proteccion de circuito hecho de esta manera.
-
公开(公告)号：CA2223145A1
公开(公告)日：1996-12-19
申请号：CA2223145
申请日：1996-06-06
Applicant: RAYCHEM CORP
Inventor： REAMEY ROBERT H , MUNCH MARK R , YOM CHI SUK , ROBISON JENNIFER L , TOTH JAMES
Abstract: An electrical device (1) which exhibits PTC behavior and which comprises a resistive element (7) electrically connected to first and second electrodes (3, 5). The resistive element is prepared from a composition comprising a curable polymeric component (9), a first particulate filler (13) which is both electrically conductive and magnetic, and an optional second particulate filler (15). The first particulate filler is dispersed in the polymeric component in discrete regions (11) which extend from the first electrode to the second electrode. Devices of the invention can be used as circuit protection devices or heaters. Also disclosed is a method of making an electrical component in which a composition comprising an electrically conductive and magnetic particulate filler is positioned on a layer which comprises a magnetic pattern to form an element, and is then cured so that discrete regions of the particulate filler form corresponding to the pattern.
-
公开(公告)号：CA2192369A1
公开(公告)日：1995-12-14
申请号：CA2192369
申请日：1995-06-09
Applicant: RAYCHEM CORP
Inventor： ZHANG MICHAEL , THOMPSON MARK S , TOTH JAMES , BEADLING WILLIAM CARDWELL
Abstract: Electrical devices, particularly circuit protection devices, contain conductive polymer elements whose edges are formed by breaking the conductive polymer element, along a desired path, without the introduction of any solid body into the element. The resulting cohesive failure of the conductive polymer produces a distinctive fractured surface. One method of preparing such devices involves etching fracture channels in the electrodes of a plaque containing a PTC conductive polymer element sandwiched between metal foil electrodes, and then snapping the plaque along the fracture channels to form individual devices. The figure illustrates a circuit protection device made in this way.
-
-
-
-
-
Search Results
6
records
(took 0.021 seconds)
