Compositions – Electrically conductive or emissive compositions – Elemental carbon containing
Patent
1987-07-21
1992-04-21
Barr, Josephine
Compositions
Electrically conductive or emissive compositions
Elemental carbon containing
252512, 252516, 252518, 252519, 252520, H01B 106
Patent
active
051065401
ABSTRACT:
A composition which comprises a matrix polymer and, distributed therein, a particulate conductive filler. At least some of the filler particles are composed of a conductive polymer composition and/or the matrix comprises a sintered polymer. The matrix polymer and the filler particles and the method of distributing the particles are such that the particles maintain their identity in the matrix. For example, the particles are preferably highly cross-linked so that they have a hot modulus of at least 250 psi if the composition is prepared by melt extrusion or another process involving a high degree of shear; or a low-shear process such as sintering can be used. Preferably the matrix polymer is capable of coating the filler particles; for example, the matrix polymer and the filler polymer may be chemically similar. The invention is particularly useful for preparing compositions which have high resistivities, eg. 1000 ohm.cm or more, and which can be prepared with a high degree of reproduceability. The compositions can exhibit PTC, ZTC or NTC behavior, depending on the nature of the conductive filler, and their resistivity is dependent on the electric field. The compositions are particularly useful as resistive materials in sheet heaters and as stress-grading materials for high voltage apparatus.
REFERENCES:
patent: 3591526 (1971-07-01), Kawashi et al.
patent: 3658976 (1972-04-01), Slade
patent: 4055615 (1987-10-01), Ikeda
patent: 4151126 (1979-04-01), Adelman
patent: 4388607 (1983-06-01), Toy et al.
patent: 4514620 (1985-04-01), Cheng et al.
patent: 4518552 (1985-05-01), Matsuo
patent: 4591700 (1986-05-01), Sopory
Barma Pradeep
Chan Chi-Ming
Mohebban Manoochehr
Rosenzweig Nachum
Barr Josephine
Burkard Herbert G.
Gerstner Marguerite E.
Raychem Corporation
Richardson Timothy H. P.
LandOfFree
Conductive polymer composition does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Conductive polymer composition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Conductive polymer composition will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1584229