| 摘要 |
PURPOSE:To make it possible to produce PP having a consistent quality at a constant production rate, by regulating the amount of addition of an organoaluminum compound according to a detected production rate of PP in polymerizing propylene by using a transition metal/organoaluminum compound catalyst. CONSTITUTION:In a process for polymerizing propylene by using a catalyst system comprising a transition metal catalyst and an organoaluminum compound (e.g., a catalyst system comprising a catalyst formed by allowing a magnesium halide to support a titanium halide and a dialkylaluminum halide/ trialkylaluminum halide) and detecting the production rate of PP based on the quantity of the heat of reaction, the production rate of PP is fixed by varying the amount of addition of the organoaluminum compound in the catalyst according to the detected production rate of PP. Thus, it is possible to produce PP of a consistent quality at a constant production rate.
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