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) 1W100wt.% of fine powder and (B) 0W99wt.% 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 ≤500μm, especially ≤74μm. 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 IWformula III [X is content (wt.%) of particles of 0.1W1μm in diameter; y is content (wt.%) of particles of 0.1W2μm in diameter; z is content (wt.%) of particles of 0.1W3μm in diameter]. The content of the filler in a resin composition is 20W97wt.%.
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TAKAHASHI KAZUO
OTAGURO KENJI
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