Basell Polyolefine Gmbh

Basf Aktiengesellschaft

Basell Poliolefine Italia, S.p.a.

Novolen Technology Holdings, C.v.

Günther Schweier

Dieter Lilge

Roland Hingmann

Martin Schneider

Volker Rauschenberger

Shahram Mihan

Franz Langhauser

Rainer Karer

Peter Bauer

Philipp Rosendorfer

Meinolf Kersting

Paulus De Lange

Martin Lux

Ingolf Hennig

Joachim Wulff-Döring

Markus Enders

Ursula Rief

Johannes Hack

Udo Handrich

Gunter Ludwig

Ralph Rudolph

Joachim Rösch

Werner Schöne

David Appleyard

Murray Horton

Kaspar Evertz

Manfred Hecker

Wolfgang Bidell

Stephan Hüffer

Stefan Seelert

Wolfgang Micklitz

Hans-Jacob Feindt

Armin Lange

Hans-Jürgen Zimmermann

Markus Endres

Jürgen Oelze

Ulrich Dahn

Novel supported, titanized chromium catalysts for the homopolymerization of ethylene and the copolymerization of ethylene with &#x3b1;-olefins, a process for preparing them and to their use for the polymerization of olefins.

Supported, titanized chromium catalyst and its use for preparing homopolymers and copolymers of ethylene

The invention relates to highly flowable propylene block copolymers that comprise 50 to 80 wt.-% of a propylene homopolymer and 10 to 70 wt.-% of a propylene copolymer having 5 to 50 wt.-% of a C&#x2013;Calk-1-ene polymerized into it that is different from propylene, and that are obtainable from the gaseous phase by a two-step polymerization by means of a Ziegler-Natta catalyst system. In a first polymerization step, the propylene is polymerized at a pressure of 10 to 50 bar, a temperature of 50 to 100&#xb0; C. and an average dwelling time of the reaction mixture of 0.3 to 5 hours in the presence of at least 2.0% by volume, based on the total volume, of hydrogen. The propylene homopolymer obtained in said first polymerization step is transferred together with the Ziegler-Natta catalyst system into an intermediate container, expanded for 0.01 to 5 minutes to less than 5 bar and maintained at a temperature of 10 to 80&#xb0; C. The pressure in the intermediate container is then increased by 5 to 60 bar by introducing under pressure a gaseous mixture, and the propylene homopolymer is then transferred to a second polymerization step together with the Ziegler-Natta catalyst system. In said second polymerization step, a mixture from propylene and a C&#x2013;Calk-1-ene is polymerized into the propylene homopolymer at a pressure of 10 to 50 bar, a temperature of 50 to 100&#xb0; C. and an average dwelling time of 0.5 to 5 hours. The weight ratio between the monomers reacted in the first and those reacted in the second polymerization step are adjusted to be in the range of from 4:1 to 1:1.

Highly flowable propylene block copolymers

Random copolymers of propylene with other 1-alkenes having up to carbon atoms,

Random propylene copolymers

Propylene homopolymers, wherein, in their separation according to tacticity by first dissolving the polymers in boiling xylene, then cooling the solution to 25&#xb0; C. at a cooling rate of 10&#xb0; C./h and then, with ascending temperature, separating the propylene homopolymers into fractions of different tacticity, either one or more of the conditions that

Highly crystalline propylene homopolymers

Novel supported, titanized chromium catalysts can be used for the homopolymerization of ethylene and the copolymerization of ethylene with &#x3b1;-olefins.

Suspended chrome catalyst containing titanium and the use thereof for producing ethylene homopolymers and copolymers

Substituted monocyclopentadienyl, monoindenyl, monofluorenyl or heterocyclopentadienyl complexes of chromium, molybdenum or tungsten, wherein at least one of the substituents of the cyclopentadienyl ring carries a rigid donor function which is not exclusively bonded through sp-hybridized carbon or silicon atoms, and a process for polymerizing olefins.

Monocyclopentadienyl complexes of chromium, molybdenum or tungsten with a donor bridge

Copolymers of ethylene with C-C&#x3b1;-olefin have a polydispersity Mw/Mn of &#x2266;10, a density of from 0.85 to 0.95 g/cm, a proportion of from 1 to 40% by weight of comonomer and a molar mass Mn above 150,000 g/mol and a comonomer composition distribution breadth index above 70%. A process for their preparation is described, as are their use and fibers, moldings, films and polymer mixtures comprising these copolymers.

Copolymers of ethylene with c3-c12 &#x3b1;-olefins

A continuous vapor-phase fluidized-bed process for the preparation of ethylene homopolymers and copolymers having a density of from 0.87 to 0.97 g/cmin which ethylene or mixtures of ethylene and C-Ca-monoolefins are (co)polymerized in the presence of a supported chromium catalyst in the polymerization zone of a vapor-phase fluidized-bed reactor under pressures ranging from 1 to 100 bar and at temperatures ranging from 30&#xb0; to 125&#xb0; C. in the vapor phase in an agitated bed of bulk material comprising particulate polymer, the resultant heat of polymerization is removed by cooling the recirculated reactor gas and the resulting (co)polymer is removed from the vapor-phase fluidized-bed reactor, wherein, for the preparation of a (co)polymer of a specific density d, the (co)polymerization is carried out at a temperature which is in a range restricted by an upper envelope defined by equation Iand a lower envelope defined by equation IIin which the variables have the following meanings:

Vapor-phase fluidized-bed process and ethylene homopolymers and copolymers produced thereby

Substituted monocyclopentadienyl, monoindenyl, monofluorenyl and heterocyclopentadienyl complexes of chromium, molybdenum or tungsten in which at least one of the substituents on the cyclopentadienyl ring carries a donor function which is bonded rigidly, not exclusively via sp-hybridized carbon or silicon atoms, and a process for the polymerization of olefins.

Monocyclopentadienyl complexes of chromium, molybdenum or tungsten

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Friedelsheim, Germany

Günther Schweier