Process for the production of block copolymer of propylene

Details Process for the production of block copolymer of propylene Process for the production of block copolymer of propylene

C - Chemistry, Metallurgy

08

F

400/2058

C08F 297/08 (2006.01) B01J 19/18 (2006.01)

Patent

CA 1293833

ABSTRACT A block copolymer of propylene can be obtained with its quality controlled uniform by conducting at first continuous polymerization of propylene in a polymerization system, receiving a polymer slurry, which has been discharged continuously from the polymerization system, in a batchwise polymerization tank, feeding ethylene to the tank to conduct batchwise polymerization of ethylene and propylene. Upon discharge of a copolymer slurry formed by the preceding batchwise polymerization, at least a predetermined amount of unreacted ethylene is left over in the tank. Into the tank with the unreacted ethylene still left over wherein, there are simultaneously charged the polymer slurry from the polymerization system and a deactivator. During this charging, ethylene is not supplied. The charging rate of the deactivator is controlled in such a way that the partial pressure of ethylene in the vapor phase of the tank always reaches a predetermined valve at the time point of completion of reception of the polymer slurry therein. The method of the instant invention produces a propylene block copolymer of uniform quality as compared with batchwise polymerization techniques in which difficulties are encountered in maintaining the quality of the resulting propylene block copolymers uniform.

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