SPHERICAL FUSED SILICA AND ITS USE IN FILLERS AND RESIN COMPOSITIONS

摘要

Spherical fused silica and its use in fillers and resin compositions Spherical fused silica with an average particle diameter within the range of 10 to 50 .mu.m and having a particle size distribution of 1 to 100 .mu.m in diameter is a useful filler for resin compositions having improved mechanical and electrical properties as well as good flowability and low viscosity. The spherical fused silica is preferably treated on its surface with a silane coupling agent. Resin compositions containing said spherical fused silica as the major filler are particularly useful as casting materials.