| 摘要 |
PURPOSE:To provide a filler for polymer giving a polymer composition having excellent moldability, thermal shock resistance and remarkably suppressed burr generation, by using fine powder satisfying a specific condition and preferably coarse powder as the components. CONSTITUTION:The objective filler is composed of (A) 1-100wt.% of fine powder and (B) 0-99wt.% of coarse powder having larger average particle diameter than the powder A. Each of the components A and B has a maximum particle diameter of <=500mum, especially <=74mum. At least a part of the components A and B is spherical powder (preferably fused silica, semi-fused silica or silica-titania glass) and the particle size distribution of the component A satisfies the formula I-formula III [X is content (wt.%) of particles of 0.1-1mum in diameter; y is content (wt.%) of particles of 0.1-2mum in diameter; z is content (wt.%) of particles of 0.1-3mum in diameter]. The content of the filler in a resin composition is 20-97wt.%.
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