| 摘要 |
PURPOSE: To obtain a styrene polymer (GPPS) composition markedly improved in strength in use. CONSTITUTION: This styrene polymer composition comprises 100 pts.wt. styrene polymer and 0.01-3 pts.wt. at least one inorganic filler selected from calcium carbonate, barium sulfate and zinc oxide, wherein the filler comprises a small particle diameter inorganic filler component (having a mean particle diameter R1μm, a specific gravityρ1 and a weight of addition W1 ) and a large particle diameter inorganic filler component (a mean particle diameter R2μm, a specific gravityρ2 and a weight of addition W2 ), and the following relationships hold: (1) 0.5<=(W1 /ρ1 )/(W1 /ρ1 +W2 /ρ2 )<=0.95, (2) 0.001<=R1 <=0.1, (3) 0.05<=R2 <=0.5 and (4) R2 -R1 >=0.03.
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