Olefin polymerisation process

Details Olefin polymerisation process Olefin polymerisation process

2007-09-18

2007-09-18

Rabago, Roberto (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S134000, C526S160000, C526S161000

Reexamination Certificate

active

10525730

ABSTRACT:
A process for the homopolymerisation of ethylene or the copolymerisation of ethylene and (a-olefins in a polymeristation reactor, said process carried out in the presence of a catalyst system comprising (a) a polymerisation catalyst and (b) an ionic activator is characterised in that an organometallic compound of a Group IIIB metal having at least one unit of formula: Mç0çR or Mç0çM where M is the Group IIIB metal and R is a hydrocarbyl group is added to the reactor. Preferred organometallic compounds include aluminoxanes and the process results in improved poison scavenging as well as advantages in activity profiles, catalyst activity and product characteristics. The process is particularly suitable for use with supported metallocene catalyst systems in the slurry or gas phase.

REFERENCES:
patent: 5834393 (1998-11-01), Jacobsen et al.
patent: 6548443 (2003-04-01), Watanabe
patent: 6608224 (2003-08-01), Resconi et al.
patent: WO97/19959 (1997-06-01), None
patent: WO 99/28353 (1999-06-01), None
patent: WO99/28353 (1999-06-01), None
Koike, T., “Method for Manufacturing Olefin Polymer”, European Patent Office, Patent Abstracts of Japan, JP 2001-302716, Oct. 31, 2001.
Michino, Y., “Production of Diene-Based Polymer”, European Patent Office, Patent Abstracts of Japan, JP 07-033817, Feb. 3, 1995.
Watanabe, K., “Method for Producing Olefinic Polymer”, European Patent Office, Patent Abstracts of Japan, JP 2001-294608, Oct. 23, 2001.

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