Process for the polymerisation of ethylene or the copolymerisati

Details Process for the polymerisation of ethylene or the copolymerisati Process for the polymerisation of ethylene or the copolymerisati

1995-03-14

1996-10-01

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526105, 526129, 526130, 526901, 526904, 526908, C08F 234, C08F 424

Patent

active

RE0353469

ABSTRACT:
The present invention relates to a process for the polymerisation of ethylene or copolymerisation of ethylene and at least one other alpha-olefin, in the gas phase in a fluidised 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 characterised 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.

REFERENCES:
patent: 2970135 (1961-01-01), Lanning et al.
patent: 3158594 (1964-11-01), Weil et al.
patent: 3922322 (1975-11-01), Roger et al.
patent: 4035560 (1977-07-01), Caumartin et al.
patent: 4295991 (1981-10-01), Wristers
patent: 4376191 (1983-03-01), Geck
patent: 4467080 (1984-08-01), Brun et al.
patent: 4517345 (1985-05-01), Eve et al.
patent: 4558023 (1985-12-01), Brun et al.
patent: 4564660 (1986-01-01), Williams et al.
U.S. Ser. No. 07/157,169, Durand et al., filed Feb. 11, 1988.
English translation of Fr. Patent 2,059,217 to Peters et al.

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