Sabic Global Technologies B.v.

Saudi Basic Industries Corporation

Tom Schoffelen

Nicolaas Hendrika Friederichs

Priya Garg

Aurora Alexandra Batinas-Geurts

Erik Zuidema

Mark Vlaar

Matthijs Van Kessel

Nicolaas Henrika Friederichs

M Priya Garg

The invention is directed to bimodal polyethylene having a flow ratio FRR ranging between &#x2265;30 and &#x2264;40, a density ranging between &#x2265;949.0 and &#x2264;952.0 kg/m3, an MFRranging between &#x2265;0.1 and &#x2264;0.2 g/10 min and comprising from 50 to 54% by weight of an ethylene homopolymer A and from 46-50% by weight of an ethylene-butene copolymer B, where all percentages are based on the total weight of the composition and wherein ethylene homopolymer A has a viscosity number &#x2265;70 and &#x2264;100 cm3/g and a density between &#x2265;968 and &#x2264;972 kg/m3. The polyethylene is suitable to be applied in the production of pipes.

Bimodal high density polyethylene

The invention is directed to a multimodal polyethylene having a flow ratio FRR ranging between &#x2265;25 and &#x2264;35, a density ranging between &#x2265;948.0 kg/mand &#x2264;953.0 kg/m, an MFRranging between &#x2265;0.1 and &#x2264;0.4 g/10 min and comprising from 50-54% by weight of an ethylene homopolymer A and from 46-50% by weight of an ethylene-hexene copolymer B, where ah percentages are based on the total weight of the composition and wherein ethylene homopolymer A has a viscosity number &#x2265;110 cm/g and &#x2264;130 cm/g and a density between &#x2265;960.0 kg/mand &#x2264;969.0 kg/m. The polyethylene is suitable to be applied in the production of pipes.

Multimodal high density polyethylene

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 the production of bimodal polyethylene in a two-step polymerization process in the presence of a catalyst system comprising: (I) the solid reaction product obtained by reacting of: a) a hydrocarbon solution containing 1) an organic oxygen containing magnesium compound or a halogen containing magnesium compound and 2) an organic oxygen containing titanium compound and b) an aluminum halogenide having the formula AIRXin which R is a hydrocarbon radical containing 1-10 carbon atoms, X is halogen and 0&#x3c;n&#x3c;3 (II) an aluminum compound having the formula AIRin which R is a hydrocarbon radical containing 1-10 carbon atom and (III) an electron donor selected from the group of 1,2-dialkoxyalkanes and 1,2-dialkoxyalkenes wherein in the first step a low molecular weight polyethylene is produced which has a MFIis between 1 and 200 dg/min, and in the second step a high molecular weight ethylene copolymer is produced in which the MFIof the total product is between 0.1 and 5 dg/min, and the weight fraction of the material produced in the first step is between 40 wt % and 60 wt % of the total product.

Process for the production of bimodal polyethylene in the presence of this catalyst system

The invention relates to a catalyst system for the production of ultrahigh molecular weight polyethylene comprising I. a solid reaction product obtained by reaction of: (a) a hydrocarbon solution comprising (1) an organic oxygen containing magnesium compound or a halogen containing magnesium compound and (2) an organic oxygen containing titanium compound and (b) a mixture comprising a metal compound having the formula MeRXwherein X is a halogenide, Me is a metal of Group III of Mendeleev's Periodic System of Chemical Elements, R is a hydrocarbon radical containing 1-10 carbon atoms and 0&#x2266;n&#x2266;3 and a silicon compound of formula RSiClwherein 0&#x2266;m&#x2266;2 and R is a hydrocarbon radical containing 1-10 carbon atoms wherein the molar ratio of metal from (b): titanium from (a) is lower than 1:1 II. an organo aluminium compound having the formula AIRin which R is a hydrocarbon radical containing 1-10 carbon atoms and III. an external electron donor selected from the group of 1,2-dialkoxyalkanes, 1,2-dialkoxyalkenes or an external polymeric electron donor.

Growing community of inventors

Hulsberg, Netherlands

Tom Schoffelen