Basf Aktiengesellschaft

Basell Polyolefine Gmbh

Other

Roger G Klimesch

Andreas Deckers

Wilhelm Weber

Eckard Schauss

Dieter Littmann

Hans-Joachim Muller

Albin Berger

Bernd Wenderoth

Axel Sanner

Bernd Lothar Marczinke

Thomas Ruhl

Andrei Gonioukh

Lothar Schlemmer

Gerhard Bleckmann

Karl-Peter Farwerck

Knut Oppenlander

Marc Heider

Arend Jouke Kingma

Heinz Friedrich Sutoris

Alexander Aumuller

Hans-Helmut Goertz

Gernot Koehler

Erich Kolk

Karl-Heinz Fauth

Andreas Koch

Joachim Krobb

Gunther Isbarn

Heinz Plaumann

Ernst Fischer

Rainer Becker

Knut Oppenlaender

Bernd Wolf

Christoph Kuenast

Hans Theobald

Eckehardt Wistuba

Peter Hofmeister

Volker Schwendemann

Walter Heckmann

Adolf Parg

Klaus Boehlke

Anton Hesse

Lothar Franz

Siegfried Lang

Juergen Mohr

Juergen Thomas

Michael Roeper

Ulrich Moll

Peter Schreyer

Hilmar Ohlig

Thomas Muehlenbernd

Philipp Rosendorfer

Michael W Mueller

Hans-Joachim Mueller

Reinhard Spengler

Lars Wittkowski

Franz G Mietzner

Wolfgang Guenther

Thomas R&uuml;hl

Hans-Joachim M&uuml;ller

Gernot Köhler

Thomas Dröge

J Urgen Hofmann

Ruger Schlund

Klaus Laemmerhirt

Stephan H&uuml;ffer

G&ouml;tz Lerch

J&uuml;rgen Sturm

Winfried Angerer

Eckehardt Witsuba

Ethylene homopolymers and copolymers are prepared in a tube reactor at from 160&#xb0; C. to 350&#xb0; C. and pressures in the range from 500 to 5000 bar, with or without use of molar mass regulators, using a peroxide mixture comprising from 1 to 95 mol %, based on the total amount of the peroxide mixture, of at least one cyclic peroxide of the formula I,where the radicals R are identical or different and are selected from among alkyl groups and aryl groups, as polymerization initiator.

Preparation of polyethylene

A process for coating a reactor, which comprises depositing a metal layer or a metal/polymer dispersion layer on the internal surface of the reactor in an electroless manner by bringing the surfaces into contact with a metal electrolyte solution which, besides the metal electrolyte, comprises a reducing agent and optionally a halogenated polymer to be deposited in dispersed form.

Method for coating reactors for high pressure polymerization of 1-olefins

A catalyst composition suitable for the (co)polymerization of alk-1-enes is obtainable by mixing a metallocene complex with a C -C -alk-1-ene in an inert solvent, reacting the resulting mixture in a controlled manner with a compound capable of forming metallocenium ions and diluting the resulting mixture with an inert nonpolar, essentially aliphatic solvent, and also, if desired, applying the catalyst composition to a particulate support material.

Catalyst for the (co)polymerization of alk-1-enes

A catalyst solution for polymerizing &agr;-olefins is obtainable by reacting a metallocene compound with an activator compound which can react with the metallocene compound so as to displace a ligand from the central atom and stabilize the resulting cationic complex by a non-coordinating anion as an ion pair, adding one or more &agr;-olefins in a molar ratio of metallocene compound: &agr;-olefins of from 1:1 und 1:100 and mixing with at least 10 parts by volume of an aliphatic hydrocarbon.

Catalyst solution for the polymerization of &agr;-olefins

Copolymer comprising ethylene units and vinyl formate units, the content of free vinyl formate in the polymer preferably being not more than 5000 ppm, based on the weight of the copolymer, a process for its preparation, and its use as flow improver, especially in petroleum distillates, preferably fuel and propellant compositions, especially petroleum middle distillates, and also a fuel and propellant composition comprising a principal quantity of a fuel and propellant and that quantity of a copolymer as above which is effective in improving the flow properties.

Ethylene-vinyl formate copolymers, process for their preparation, their use as flow improvers, and fuel and propellant compositions comprising them

Ethylene-vinyl formate copolymers, process for their preparation, their

Process for producing ethylene copolymers under high pressure

A process for compressing ethylenically unsaturated monomers at a pressure of 200-5000 bar in the absence of a polymerization initiator comprises carrying out compression in the presence of a sterically hindered amine derivative.

Compression of ethylenically unsaturated monomers

Copolymers of ethylene with .alpha.,.beta.-unsaturated carboxylic acids are prepared at from 50.degree. to 250.degree. C. and from 500 to 5000 bar in a stirred autoclave having a length/diameter ratio greater than 5:1 by a process in which the monomer mixtures are fed into the autoclave in at least two part-streams, the first part-stream being passed into the autoclave at the beginning of the autoclave pipe and the second part-stream being introduced at a position which is a distance away from the beginning which corresponds to 25-50% of the total length and the amount of the .alpha.,.beta.-unsaturated carboxylic acids in the first part-stream is from 20 to 90% less than the average amount in the further part-streams and a peroxide polymerization initiator having a lower decomposition temperature, or a mixture of peroxide polymerization initiators having a lower average decomposition temperature, than that of the initiators in the further part-streams is passed in with the first part-stream.

Process for the preparation of ethylene/(meth)acrylic acid copolymers

Ethylene-based copolymers which are suitable as flow improvers for mineral oil middle distillates are composed of

Ethylene-based copolymers and their use as flow improvers in mineral oil

Poly-1-n-alkenylamines, and fuel and lubricant compositions containing

A process for the preparation of copolymers of ethylene and dicarboxylic acid in the presence of a free-radical inhibitor. The process comprises of warming a mixture of ethylene and C.sub.3 -C.sub.6 -alkenecarboxylic acid to a temperature of from 60.degree. to 100.degree. C. before addition of the free-radical inhibitor. The maximum polymerization temperature to recover said copolymers of ethylene is in the range of from 100.degree. to 260.degree. C.; and wherein said copolymer comprises from 94 to 99.5 mol % of ethylene and from 0.5 to 6.0 mol % of C.sub.3 -C.sub.6 -alkenecarboxylic acid.

Preparation of copolymers of ethylene with alkenecarboxylic acids

Polyolefins are thermomechanically degraded in a twin-screw extruder without a downstream degradation apparatus, at from 300.degree. to 550.degree. C. and from 1 to 100 bar and in average residence times of the reaction mixture of from 0.5 to 10 minutes, by a process in which the pressure in the twin-screw extruder is changed periodically or aperiodically with a fluctuation of from 0.5 to 30 bar. The novel process is particularly suitable for the degradation of polypropylene.

Thermomechanical degradation of polyolefins

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Alsbach/Haehnlein, Germany

Roger G Klimesch