Dow Global Technolgoies LLC

Patrick J C Schouterden

Ruddy A J Nicasy

Kalyan Sehanobish

Jozef Van Dun

Noorallah Jivraj

Johan Vanvoorden

Peter F Van Den Berghen

Frederik E Gemoets

Sarat Munjal

Burkhard Eric Wagner

Ravindra S Dixit

Ravi S Dixit

Robert J Jorgensen

Ruddy Nicasy

Robert J Jorgesen

Frederick E Gemoets

Sarat J C Munjal

The invention relates to a polyethylene composition with a bimodal molecular weight distribution and articles made therefrom, such as high topload blow moldings and transmission and distribution pipes. The composition comprises a low-molecular-weight (LMW) ethylene homopolymer component and a homogeneous, high-molecular-weight (HMW) ethylene interpolymer component, wherein the LMW component is characterized as having a molecular weight distribution, MWD, of less than about 8. The composition is characterized as having a bimodal molecular weight distribution, and a ductile-brittle transition temperature, T, of less than &#x2212;20&#xb0; C. In some embodiments, the HMW component is characterized by a reverse comonomer distribution.

Bimodal polyethylene composition and articles made therefrom

The present invention relates to a process of producing an ethylene polymer composition in multiple stages, of which the first stage is preferably a slurry polymerization stage, in the presence of a catalyst system, comprising: a) a solid catalyst precursor, comprising a transition metal selected from titanium and vanadium; magnesium; a halide, optionally an electron donor; and a solid particulate material comprising an inorganic oxide, and wherein the median particle diameter, D, of the solid catalyst precursor, based upon the total volume of solid catalyst precursor, is from 1 to 13 micrometers; and b) an organoaluminium compound.

Multistage process for producing ethylene polymer compositions

The present invention relates to a process of producing an ethylene polymer composition in multiple stages of which the first stage is a slurry polymerization stage, in the presence of a catalyst system comprising a) a solid catalyst precursor comprising a transition metal selected from titanium and vanadium; magnesium, a halide, optionally an electron donor, and a solid particulate material comprising an inorganic oxide, wherein the median particle diameter of the solid catalyst precursor based upon the total volume of solid catalyst precursor, D, is from 1 to 13 micrometers; and b) an organoaluminium compound.

The invention relates to a polyethylene composition with a bimodal molecular weight distribution, methods for making the same, and articles made therefrom, such as high topload blow moldings and transmission and distribution pipes. The composition comprises a low-molecular-weight (LMW) ethylene homopolymer component and a homogeneous, high-molecular-weight (HMW) ethylene interpolymer component, wherein the LMW component is characterized as having a molecular weight distribution, MWD, of less than about 8. In some embodiments, the HMW component is characterized by a reverse comonomer distribution.

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Wachtebeke, Belgium

Patrick J C Schouterden