Basell Polyolefine Gmbh

Hostalen Polyethylen Gmbh

Ludwig B&ouml;hm

Joachim Berthold

Johannes-Friedrich Enderle

Elke Damm

Ulrich Schulte

Reinhard Schubbach

Paul-Richard Sch&ouml;neborn

Johannes Friederich Enderle

Rainer M&uuml;nnig

A polyethylene molding material has a bimodal molecular weight distribution with an overall density of &gE;0.948 g/cm and a melt flow index MFI of &lE;0.2 dg/min. The molding material comprises from 35 to 65% by weight of low-molecular-weight ethylene hompolymer A having a viscosity number VN in the range from 40 to 90 cm /g, a melt flow index MFI in the range from 40 to 2000 dg/min and a density d of &gE;0.965 g/cm . Also included is from 35 to 65% by weight of high-molecular-weight ethylene copolymer B having a viscosity number VN in the range from 500 to 2000 cm /g, a melt flow index MFI in the range from 0.02 to 0.2 dg/min and a density d in the range from 0.922 to 0.944 g/cm .

Polyethylene molding material and pipe produced therewith with improved mechanical properties

Polyethylene moulding compound with an improved ESCR/stiffness relation and an improved swelling rate, a method for the production thereof and the use thereof

The novel process for preparing ethylene copolymers by polymerizing ethylene with, as comonomer, up to 10% by weight, based on the total amount of the monomers, of a 1-olefin of the formula R&mdash;CH&boxH;CH,, where R is a straight-chain or branched alkyl radical having from 1 to 4 carbon atoms, is carried out in a polymerization reactor and in suspension with a dispersion medium at a temperature of from 20 to 100&deg; C. and a pressure of from 2 to 20 bar, in the presence of a catalyst. The dispersion medium is then separated from the polymer. After carrying out the polymerization, but before removing the dispersion medium from the polymer, the suspension stream is partly evaporated, with the result that some of the wax formed in the polymerization is adsorbed onto the polymer and the resultant vapor stream is fed directly into the reactors after condensation or back into the process after distillative removal of the comonomer.

Suspension polymerization for preparing polyolefins

Growing community of inventors

Hattersheim, Germany

Ludwig Böhm

Growing community of inventors

Hattersheim, Germany

Ludwig B&ouml;hm

Ludwig Böhm