Basf Aktiengesellschaft

Basell Polyolefine Gmbh

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Wilhelm Weber

Andreas Deckers

Roger G Klimesch

Eckard Schauss

Andrei Gonioukh

Lars Wittkowski

Arend Jouke Kingma

Heinz Friedrich Sutoris

Stefan Weiss

Reinhold J Leyrer

Harald Lauke

Alexander Aumuller

Georg Groos

Frank-Olaf M&auml;hling

Andreas Koch

Klaus Hammer

Hubert Trauth

Bernd Wenderoth

Dieter Littmann

Martin Jochen Klatt

Michael Ehle

Klaus Boehlke

Thomas Loerzer

Brigitte Gareiss

Peter Lechtken

Gustav Bock

Gernot Koehler

Ulrich Moll

Frank-Olaf Mähling

Ulrich Annen

Bernhard Nick

Thomas Dröge

Michael Wolfgang Muller

Siegfried Gast

Dietmar Ebisch

Frank Olaf Maehling

Gerhard Hofmann

Thomas Dr&ouml;ge

Reiner Hoffman

Naria Edlu Keene Von Koenig

Peter Wedel

Stephan H&uuml;ffer

G&ouml;tz Lerch

J&uuml;rgen Sturm

Michael Stenger

A process for preparing ethylene polymers by the high-pressure method comprises dissolving one or more free-radical initiators in one or more ketones of the formula Iwhere Rand Rare identical or different and are selected from among C-C-alkyl and C-C-cycloalkyl and Rand Rmay also be covalently linked to one another to form a 4- to 13-membered ring, prior to the polymerization,compressing the solution, metering it into the polymerization reactor at one or more points and subsequently carrying out the polymerization at from 150 to 380&#xb0; C. and from 500 to 4500 bar.

Preparation of ethylene polymers by the high-pressure method

In a process for the polymerization of ethylene and optionally further monomers in a high-pressure reactor at from 120 to 350&#xb0; C. and pressures of from 1000 to 4000 bar, hydrogen is intermittently introduced into the reactor.

Method for high pressure polymerization of ethylene

Method for producing ethylene polymers in a high-pressure process

Pigment concentrates comprising at least one pigment, a polyethylene wax prepared from one ethylene and, if desired, one comonomer using a metallocene catalyst, if desired a thermoplastic polymer and, if desired, additives can be used to color plastic moldings and plastic sheets.

Pigment concentrates and their production

Copolymers of ethylene have from 1 to 30 mol % of alkyl(meth)acrylates and, if desired, other comonomers, and have a residual comonomer content of less than 0.5% by weight in the copolymer. A process for preparing copolymers of this type in a combination of stirred autoclave and tubular reactor is described, as is the use of the copolymers for preparing polyamide molding compositions.

Ethylene(meth)acrylate copolymers with low residual content in comonomers

Preparation of polyethylene waxes

In a process for preparing ethylene-vinyl acetate copolymers in which a mixture of ethylene and vinyl acetate is polymerized continuously in the presence of free-radical polymerization initiators and, if desired, molecular weight regulators in a cooled tube reactor at a pressure in the range from 1000 to 3500 bar, and the poly-merization initiator is added at the beginning and at two or more points along the tube reactor, and temperature changes in the reaction mixture along the tube reactor, between the first temperature maximum and the last addition of the polymerization initiator, are within a range of not more than 20&deg; C.

Method for producing ethylene copolymers in segmented tubular reactors and utilizing copolymers as a flow improver

Preparation of emulsifiable ethylene polymers

A probe for temperature measurement, comprising a probe, body which has a cylindrical hole into which a thermocouple or a resistance thermometer can be inserted, whose thermosensitive tip projects from the forward section of the probe body, the forward section of the probe body being provided with an annular gap at a small distance from the cylindrical hole .

Temperature measuring probe

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

Flame-proofed molding materials

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

In a process for the high-pressure polymerization of ethylene in a high-pressure autoclave or in a high-pressure tube reactor having one or more metering points for one or more peroxides, no peroxide or a reduced amount of peroxide is metered in during the time interval in which the pressure is lowered by opening a pressure maintenance valve and the original amount of peroxide per unit time is metered in again as soon as the pressure after closure of the pressure maintenance valve has built up again so that it exceeds 90% of the pressure difference between nominal pressure and lowered pressure.

Process optimization of peroxide injection during polyethylene production

Pressurization of ethylenically unsaturated monomers

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Neustadt, Germany

Wilhelm Weber