Basf Aktiengesellschaft

Klaus-Dieter Ruempler

Erhard Seiler

Rainer Alexander Werner

Guenther Schweier

Juergen Kerth

Sibylle Brosius

Wolfgang Gruber

Harald Schwager

Rudolf Mueller-Mall

Udo Haardt

Ralf Zolk

Hans-Georg Braun

Rainer Henning

Karl Huber

Susanne Hahn

Norbert Jung

Juergen Hamprecht

A partially crosslinked polymer composition having a melt flow index of from 0.1 to 50 g/10 min at 230.degree. C. under a weight of 2.16 kg and comprising

Partially crosslinked polymer composition

Polymer blends of propylene copolymers and polyethylene

A recyclable bumper system based on polypropylene comprises a bumper support A of glass fiber reinforced polypropylene, an energy-absorbing foam core B of foamed polypropylene and a tough shell C of EP-rubber modified polypropylene which may be coated, and can be recycled by mechanical comminution, extrusion and granulation, resulting in granules from which injection moldings having good mechanical properties can be produced.

Recyclable bumper system

Propylene/ethylene block copolymers are prepared by a continuous process in which, in each case in an agitated fixed bed of finely divided polymer from the gas phase, first (I) in a first polymerization zone, propylene is homopolymerized by feeding in a Ziegler-Natta catalyst system consisting of (1) a titanium component which contains titanium, magnesium, chlorine and a phthalic acid derivative, (2) an aluminumalkyl component and (3) a silane component, and (II) in a second polymerization zone, a mixture of propylene and ethylene is polymerized with the propylene homopolymer present in the reaction mixture obtained in the first polymerization zone by feeding in the said reaction mixture. In the process, (A) a titanium component (1) is used which is obtained by a method in which (1.1) first, (1.1.1) in a liquid hydrocarbon, (1.1.2) a finely divided magnesium halide, (1.1.3) an alkanol, (1.1.4) a certain phthalic acid derivative and (1.1.5) titanium tetrachloride are reacted with one another under certain conditions, (1.2) the solid intermediate obtained from (1.1) is extracted with titanium tetrachloride or a liquid alkylbenzene until the remaining solid substance has become substantially richer in magnesium, and (1.3) finally, the solid substance remaining in (1.2) is washed with an alkane in a certain manner, (B) a specific silane is used as (3), and (C) specifically selected polymerization parameters are employed, with relationships between the first and second polymerization zones.

Preparation of propylene/ethylene polymers of the toughened

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Wachenheim, Germany

Klaus-Dieter Ruempler