Prepolymers of olefins containing a chromiumoxide and a granular

Details Prepolymers of olefins containing a chromiumoxide and a granular Prepolymers of olefins containing a chromiumoxide and a granular

1990-01-02

1992-11-24

Teskin, Fred

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

526105, 526106, 5263484, 5263485, 5263486, 526352, 526904, 502108, B32B 2702

Patent

active

051659980

ABSTRACT:
The present invention relates to a process for the polymerization of ethylene or copolymerization of ethylene and at least one other alpha-olefin, in the gas phase in a fluidized bed reactor, in the presence of a catalyst comprising chromium compounds associated with a granular support comprising a refractory oxide and activated by thermal treatment, which process is characterized in that the catalyst is used in the form of active particles of prepolymer, obtained by bringing the said catalyst in contact with ethylene, alone, or in a mixture with at least one higher alpha-olefin, in such a way that the prepolymer contains from 4.times.10.sup.-5 to 3 milligram atoms of chromium in the catalyst per gram.

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patent: 4376191 (1983-03-01), Geck
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patent: 4517345 (1985-05-01), Eve et al.
patent: 4564660 (1986-01-01), Williams et al.
Ser. No. 07/157,169, Durand et al, filed Feb. 11, 1988.

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