FILLER POWDER AND METHOD FOR MANUFACTURING SAME

摘要

The present invention provides a filler powder having a thermal expansion coefficient lower than that of silica powder, and, when the filler powder is blended with a resin, causing minimal change in the properties or color of the resin. A filler powder characterized in comprising a crystallized glass obtained by precipitating aβ-quartz solid solution and/or aβ-eucryptite solid solution. The average grain size (D50) is preferably no greater than 5 µm. The thermal expansion coefficient within the range of 30-150°C is preferably no greater than 5 × 10-7/°C.