| 摘要 |
Provide are fluororesin and silica compositions having a low coefficient of thermal expansion. The fluororesin compositions include 20 to 70 wt% of a melt-processible fluororesin and 80 to 30 wt% of silica particles. The silica particles are constituted by leafy silica secondary particles formed as a result of a parallel overlap of a plurality of scaly silica primary particles, or flower petal-shaped tertiary particles formed as a result of the aggregation of the leafy silica secondary particles, or mixtures thereof. The thickness of the scaly silica primary particle is 0.001 to 0.1 μm, the thickness of the leafy silica secondary particles is 0.001 to 3 μm, and the ratio of the length of the leafy silica secondary particle with respect to their thickness is 2 to 300. |
