Process for the production of block copolymer of propylene and e

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

1988-06-01

1990-05-01

Briggs, Sr., Wilbert J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525323, C08F 200, C08F29300, C08F29708

Patent

active

049219057

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 therein, 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 value at the time point of completion of reception of the polymer slurry therein.

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