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    • 1. 发明申请
    • CONDUCTIVE POLYMER COMPOSITION
    • 导电聚合物组合物
    • WO1989000755A1
    • 1989-01-26
    • PCT/US1988002484
    • 1988-07-21
    • RAYCHEM CORPORATIONBARMA, PradeepCHAN, Chi-MingMOHEBBAN, ManoochehrROSENZWEIG, NachumKURJATKO, Eugen, L.
    • RAYCHEM CORPORATION
    • H01B01/24
    • H01C7/06C08K3/013C08K9/10H01B1/22H01B1/24H01C7/027
    • 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, e.g. 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.
    • 一种组合物,其包含基质聚合物并在其中分布有颗粒状导电填料。 至少一些填料颗粒由导电聚合物组合物和/或基质包含烧结聚合物组成。 基质聚合物和填料颗粒以及分散颗粒的方法使得颗粒在基质中保持它们的相同性。 例如,颗粒优选是高度交联的,使得如果组合物通过熔融挤出或涉及高剪切程度的另一种方法制备,它们的热模量至少为250psi; 或者可以使用诸如烧结的低剪切工艺。 优选地,基质聚合物能够涂覆填料颗粒; 例如,基质聚合物和填料聚合物可以化学相似。 本发明特别可用于制备具有高电阻率的组合物,例如, 1000欧姆·厘米或更高,并且可以以高度的可再现性制备。 组合物可以表现出PTC,ZTC或NTC的行为,这取决于导电填料的性质,其电阻率取决于电场。 该组合物特别可用作片状加热器中的电阻材料和用作高压设备的应力分级材料。