Process for the polymerization or copolymerization of alpha-olef

Details Process for the polymerization or copolymerization of alpha-olef Process for the polymerization or copolymerization of alpha-olef

1987-11-03

1990-05-01

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

502120, 526901, 526904, 526352, 526138, C08F 234, C08F 1000

Patent

active

049219200

ABSTRACT:
The present invention relates to a gas phase process for the (co-)polymerization of alpha-olefins in a fluidized bed, by means of a catalyst system of the Ziegler-Natta type consisting of a catalyst (a) comprising magnesium, halogen and transition metal atoms and a cocatalyst (b) consisting of an organometallic compound. The catalyst system is (i) prepared in a granular form, either fixed on a granular support or converted into a prepolymer, (ii) then subjected to a treatment by a polymerization inhibiting agent in the absence of alpha-olefins, and then (iii) brought into contact with alpha-olefins under (co-)polymerization conditions in the fluidized bed, in the presence of a cocatalyst (c) consisting of an organometallic compound, identical or different from the cocatalyst (b).

REFERENCES:
patent: 4130699 (1978-12-01), Hoff et al.
patent: 4208497 (1980-06-01), Bronstert et al.
patent: 4282341 (1981-08-01), Klaerner et al.
patent: 4326048 (1982-04-01), Stevens et al.
patent: 4482687 (1984-11-01), Noshay et al.
patent: 4511703 (1985-04-01), Bailly
patent: 4579836 (1986-04-01), Arzoumanidis et al.

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