Process for the start up of polymerization or copolymerization i

Details Process for the start up of polymerization or copolymerization i Process for the start up of polymerization or copolymerization i

1991-04-12

1991-12-31

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 88, 526129, 526348, 5263484, 5263486, 526351, 526352, 526901, 526904, C08F 234, C08F 1000

Patent

active

050773585

ABSTRACT:
The present invention relates to a process for the start up of polymerization or copolymerization in the gas phase by bringing the said alpha-olefins in contact under polymerization or copolymerization conditions in a fluidized bed and/or with mechanical stirring with a charge powder, in the presence of a catalyst system of the Ziegler-Natta type, this process being characterized in that the charge powder used is previously dehydrated and subjected to a treatment by bringing the said charge powder into contact with an organoaluminum compound for a period of at least five minutes, so that the polymerization or copolymerization starts up immediately after the contracting of the alpha-olefins with the charge powder in the presence of the catalyst system.

REFERENCES:
patent: 4003712 (1977-01-01), Milla
patent: 4035560 (1977-07-01), Caumartin et al.
patent: 4166167 (1979-08-01), Bye et al.
patent: 4427573 (1984-01-01), Miles et al.
patent: 4467080 (1984-08-01), Brun et al.
patent: 4564660 (1986-01-01), Williams et al.
patent: 4721763 (1988-01-01), Bailly et al.

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