Saudi Basic Industries Corporation

Sabic Global Technologies B.v.

Mark Vlaar

Nicolaas Hendrika Friederichs

Gennadii Dimitrievich Bukatov

Vladimir Aleksandrovich Zakharov

Sergei Andreevich Sergeev

Yves Johann Elizabeth Ramjoie

Mansour Izzat Taftaf

Atieh Aburaqabah

Tom Schoffelen

Matthijs Van Kessel

The invention relates to a continuous process for the production of ultra-high molecular weight polyethylene with an Elongational Stress of at least 0.43 N/mm. The polymerization of ethylene takes place in the presence of a catalyst and hydrogen. It is an advantage of the process according to the invention that the use of small amounts of hydrogen during the production of UHMWPE reduces reactor fouling. Furthermore, the process according to the invention results in longer run times in polymerization reactors, less cleaning cycles to remove reactor fouling and in less need for other anti-fouling agents or anti-static agents.

Continuous process for the production of ultra-high molecular weight polyethylene

The invention relates to a process for preparing a polymerization catalyst component wherein a solid compound with formula Mg(OR)Clwherein x is larger than 0 and smaller than 2, and each R, independently, represents an alkyl group, said compound being obtained by reacting a Grignard compound with an alkoxy- or aryloxy-containing silane compound, is contacted with at least one activating compound selected from the group formed by internal electron donors and compounds of formula M(OR)(R), wherein M can be Ti, Zr, Hf, Al or Si, each Rand R, independently, represent an alkyl, alkenyl or aryl group, v is the valency of M and w is smaller than v, in the presence of an inert dispersant to give an intermediate reaction product, and wherein the intermediate reaction product is contacted with a halogen-containing Ti-compound. A catalyst system comprising said component shows improved performance in olefin polymerization. The invention also relates to a polymerization catalyst system comprising the catalyst component and to a process of making a polyolefin by contacting at least one olefin with a polymerization catalyst system comprising the catalyst component.

Process for preparing a catalyst component for propylene polymerization

The invention is directed to a process for the preparation of a catalyst component wherein a compound with formula Mg(OAlk)Clwherein x is larger than 0 and smaller than 2, y equals 2&#x2212;x and each Alk, independently represents an alkyl group, is contacted with a titanium tetraalkoxide and/or an alcohol in the presence of an inert dispersant to give an intermediate reaction product and wherein the intermediate reaction product is contacted with titanium tetrachloride in the presence of an internal donor. The invention also relates to a polymerization catalyst comprising the catalyst component and furthermore the invention relates to the polymerization of an olefin in the presence of the polymerization catalyst comprising the catalyst component.

Process for the preparation of a catalyst component for the polymerization of an olefin

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Roermond, Netherlands

Mark Vlaar