ELECTRICAL BASE PLATE MATERIAL COMPRISING CERAMIC-FILLED COMPOSITE POLYMER,HAVING HIGH DIELECTRIC CONSTANT AND LOW THERMAL COEFFICIENT OF DIELECTRIC CONSTANT

摘要

A high dielectric (K' > 5), comparatively low thermal coefficient (absolute value of TCK' </= 200 ppm/ DEG C) polymeric composite is presented . The composite comprises a polymeric matrix; particulate ceramic filler material, said filler material comprising a mixture of at least one first ceramic material having a K' < 30 and a TCK' > 0 ppm/ DEG C; and at least one second ceramic material having a K' > 30 and a TCK' < - 300 ppm/ DEG C. The mixture of ceramic fillers is proportioned in a ratio effective to provide the composite material with a K' of >/= 5 and an absolute value TCK' of < 200 ppm/ DEG C. <IMAGE>