1
Walter Kaminsky, Klaus Kulper, Maria Buschermohle, Hartmut Luker: Process for the preparation of polyolefins. Hoechst Aktiengesellschaft, September 6, 1988: US04769510 (132 worldwide citation)

In the polymerization of propylene and other higher 1-olefins, polymers which have a high degree of isotacticity and a narrow distribution of molecular weight are obtained in the presence of a catalyst system composed of a zirconium compound which is stereo-rigid and chiral and a linear or cyclic al ...


2
Hartmut Luker: Polyethylene wax, and a process for the preparation thereof. Hoechst Aktiengesellschaft, June 11, 1991: US05023388 (55 worldwide citation)

Polyethylene waxes having a very narrow molecular weight distribution, high isotacticity, a narrow grain size distribution and a high bulk density are obtained by means of a catalyst comprising a metallocene and an aluminoxane, in the presence of small amounts of hydrogen during the polymerization.


3
Martin Antberg, Walter Spaleck, Jurgen Rohrmann, Hartmut Luker, Andreas Winter: Process for the preparation of an ethylene/propylene copolymer. Hoechst Aktiengesellschaft, February 4, 1992: US05086134 (43 worldwide citation)

The invention relates to a process for the preparation of a predominantly crystalline ethylene/propylene copolymer having less than 15 mol % of propylene units, which can be carried out in liquid propylene as the suspending agent, if metallocene catalyst components of the formulae I, II or III are e ...


4
Joachim Berthold, Ludwig Bohm, Werner Breuers, Johannes Friedrich Enderle, Manfred Fleissner, Rainer Lecht, Hartmut Luker, Ulrich Schulte, Heiner Bromstrup: Pipe of polyethylene having improved mechanical properties. Hoechst Aktiengesellschaft, Connolly & Hutz, June 1, 1999: US05908679 (35 worldwide citation)

The invention relates to a high strength pipe of ethylene polymer having a bimodal molecular weight distribution. Such pipe has a stress cracking resistance of .gtoreq.1400 h, a fracture toughness of .gtoreq.7 mJ/mm.sup.2 and a modulus of creep in flexure, measured according to DIN 54852-Z4, of .gto ...


5
Martin Antberg, Hartmut Luker, Ludwig Bohm: Process for the preparation of a 1-olefin polymer. Hoechst Aktiengesellschaft, April 13, 1993: US05202398 (20 worldwide citation)

If the transition metal component used in an olefin polymerization catalyst is the product of the reaction between a siloxane-substituted metallocene of titanium, zirconium or hafnium and a hydroxyl group-containing support material, for example silicon dioxide, these metallocene catalysts can be em ...


6