| 摘要 |
PURPOSE:Small amounts of an organic peroxide and a crosslinking agent area added to polypropylene so that they keep a prescribed ratio, then they are heat-treated at a specific temperature to improve melt tension and toughness without any adversely effecting shock resistance. CONSTITUTION:(A) 100pts.wt. of a polypropylene with a melt index of 0.5-30, preferably 2-20g/10min are combined with (B) 0.01-0.2, preferably 0.02-0.1pt.wt. of an organic peroxide, preferably whose decomposition temperature is 150-270 deg.C, when its half life is set to 1min, such as 1,3-bis(t- butylperoxisopropyl)benzene and (C) 0.05-1.5, preferably 0.06-1.2pt.wt. of a crossing agent, preferably a divinyl compound, maleimide or quinone dioxime so that the weight ratio of C/B becomes 3-12, preferably 4-10 and the resultant composition is heat-treated at 180-270 deg.C.
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