Process for the starting of the polymerization of ethylene or co

Details Process for the starting of the polymerization of ethylene or co Process for the starting of the polymerization of ethylene or co

1988-02-11

1991-12-24

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526106, 5263486, 526352, 526901, 526 74, 526904, C08F 234, C08F 1002

Patent

active

050753959

ABSTRACT:
The present invention relates to a process for starting up the polymerization of ethylene or copolymerization of ethylene and at least one other alpha-olefin by bringing ethylene and optionally at least one other alpha-olefin in contact under fluidized-bed polymerization or copolymerization conditions and/or stirred mechanically, with a charge powder in the presence of a catalyst comprising a chromium oxide compound associated with a granular support and activated by thermal treatment, this catalyst being used in the form of a prepolymer, this process being characterized in that the charge powder employed is previously subjected to a treatment by contacting the said charge powder with an organo-aluminium compound, in such a way that the polymerization or copolymerization starts up immediately after the contacting of the ethylene and optionally one other alpha-olefin with the charge powder in the presence of the prepolymer.

REFERENCES:
patent: 2970135 (1961-01-01), Lanning et al.
patent: 3158594 (1964-11-01), Weil et al.
patent: 3922322 (1975-11-01), Dormenval 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
patent: 4517345 (1985-05-01), Eve et al.
patent: 4564660 (1986-01-01), Williams et al.
patent: 4910271 (1990-03-01), Bailly et al.

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