| 摘要 |
PURPOSE:To obtain the titled copolymer efficiently by conducting batchwise polymerization in good controllability, by removing the heat of polymerization in the tank for the batchwise polymerization by evaporating a volatile liquid medium and controlling the amount of noncondensible gas feed according to the inside temperature of the polymerization tank. CONSTITUTION:In the production of a propylene block copolymer by conducting the polymerization of propylene or the copolymerization of propylene with a small amount of ethylene by a continuous operation and subsequently conducting the copolymerization of ethylene with propylene in the presence of the above (co)polymer by a batchwise operation, said production is conducted by controlling the process is follows. Namely, the heat of polymerization in the tank for the batchwise (co)polymerization is removed by evaporating a volatile liquid medium and condensing the vapor by a reflux condenser; the amount of a coolant fed to the reflux condenser is controlled according to the pattern of heat generation predetermined from the relationships with an ethylene/propylene reaction ratio and an amount of reaction, in addition, at least part of the noncondensible gas from the reflux condenser can be fed to the line for feeding the vapor to the reflux condenser, and the amount of this noncondensible gas feed is controlled according to the inside temperature of the polymerization tank.
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