Basf Aktiengesellschaft

Basell Polyolefine Gmbh

Lars Wittkowski

Andreas Deckers

Wilhelm Weber

Andrei Gonioukh

Michael Ehle

Frank-Olaf Mähling

Frank-Olaf M&auml;hling

Gernot Köhler

Thomas Dröge

Siegfried Gast

Dieter Littmann

Roger G Klimesch

Stefan Weiss

Philipp Rosendorfer

Katrin Zeitz

Wolfgang Kasel

Andreas Fechtenkötter

Ernst Fischer

Axel Schmitz

Thomas Dr&ouml;ge

Michael Hoppach

A process for preparing ethylene homopolymers and copolymers in a tubular reactor having two or more polymerization zones at temperatures of between 150&#xb0; C. and 350&#xb0; C. and pressures in the range from 500 to 5000 bar, using oxygen as initiator, which comprises using, as molar mass regulator, one or more aliphatic ketones of the formula I, where the variable Ris a C-C-alkyl or C-C-cycloalkyl, ethylene homopolymers and copolymers obtainable therefrom and their user for producing injection-molded products in the cosmetics, medical and food sectors are described.

Nonodorous ethylene homopolymers and copolymers having good mechanical properties

The invention relates to a method for producing thixotropic agents containing 0.1&#x2013;30 wt.-% of at least one ethylene terpolymer wax, 5&#x2013;7 wt.-% of at least one solvent, which is incompatible with the ethylene terpolymer wax, 5&#x2013;85 wt.-% of of at least one solvent which is compatible with the ethylene terpolymer wax and with one or more of the first-named solvents.

Thixotropic agents comprising ethylene terpolymer waxes

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

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

Method for producing ethylene polymers in a high-pressure process

Preparation of polyethylene waxes

Preparation of emulsifiable ethylene polymers

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Mannheim, Germany

Lars Wittkowski