Bayer Aktiengesellschaft

Lanxess Corporation

Basf Aktiengesellschaft

Lanxess Deutschland Gmbh

Martin Bohnenpoll

Gerhard Langstein

Heinrich Alberts

Adolf Schmidt

Gabor Kaszas

Stephan Glander

Herbert Eichenauer

Rui Resendes

R Resendes

Mark J Drewitt

Werner Obrecht

Oskar Nuyken

Anthony Sumner

Uwe Denninger

Mario Vierle

Rotraud Casper, Legal Representative

Jürgen Ismeier

Peter Plesch

Marc Verhelst

William E App

J&uuml;rgen Ismeier

Hans Ludwig Krauss

Fritz Kühn

Dirk Kurt Schön

Mark Drewitt

The present invention relates to a continuous process for producing polymers at conversions ranging from 50% to 95% having a Mooney viscosity of at least 25 Mooney-units and a gel content of less than 15 wt. % containing repeating units derived from at least one isoolefin monomer, more than 4.1 mol % of repeating units derived from at least one multiolefin monomer and optionally further copolymerizable monomers in the presence of AlCland a suitable proton source (e.g. water) or cationogen and at least one multiolefin cross-linking agent wherein the process is conducted in the absence of transition metal compounds and organic nitro compounds.

Process for production of high-isoprene butyl rubber

The present invention relates to a process for the production of highly reactive polyisobutenes with a content of terminal vinylidene groupings of greater than 80 mol % and an average molecular weight of 500 to 10,000 Dalton by cationic polymerization of isobutene or of isobutene and monomers copolymerizable with isobutene in the presence of solvent-stabilized transition metal complexes with weakly coordinated anions.

Process for the production of highly reactive polyisobutenes

The present invention relates to a process for producing polymers comprising repeating units derived from at least one isoolefin monomer, at least one multiolefin monomer and optionally further copolymerization monomers in the presence of at least one organic nitro compound and AlCl/water wherein the process is conducted in the absence of compounds selected from the group consisting of vanadium compounds, zirconium halogenid, and hafnium hallogenides.

The present invention provides a novel process for the preparation of isoolefin copolymers in the presence of zirconium halides or hafnium halides or mixtures thereof and organic nitro compounds, especially for the preparation of butyl rubbers, as well as isoolefin copolymers composed of isobutene, isoprene and, optionally, further monomers.

Process for the preparation of isoolefin copolymers

The present invention provides a novel process for the preparation of isoolefin copolymers in the presence of zirconium halides and/or hafnium halides and organic acid halides, in particular for the preparation of butyl rubbers, as well as isoolefin copolymers constructed of isobutene, isoprene and optionally further monomers.

The present invention relates to halogenated, low-gel, high molecular weight isoolefin multiolefin copolymers, in particular to halogenated, low-gel, high molecular weight butyl rubbers, and halogenated, low-gel, high molecular weight isoolefin multiolefin copolymers synthesized from isobutene, isoprene and optionally further monomers, with a multiolefin content of greater than 2.5 mol %, a molecular weight M of greater than 240 kg/mol and a gel content of less than 1.2 wt. % and a process for their preparation.

Halogenated, high molecular weight, gel-free isobutene copolymers with elevated double bond contents

This invention relates to an initiator system for the polymerization of isoolefins having 4 to 16 carbon atoms, optionally with monomers polymerizable with isoolefins, the system consisting of or one or more aromatic or heteroaromatic, polycyclic hydrocarbons and an aged, organic solution of vanadium tetrachloride, wherein the concentration of the vanadium tetrachloride is 0.01 mmol to 500 mmol per liter of solvent and the molar ratio of aged vanadium tetrachloride to polycyclic hydrocarbons is in the range from 100:1 to 1:100. It is possible by means of the initiator system according to the invention to produce polyisoolefins, in particular butyl rubbers, at relatively high temperatures with only a low gel content and of a sufficiently high molecular weight.

Initiator systems containing vanadium tetrachloride for the

Elastic-thermoplastic graft polymers manufactured by radical emulsion polymerization of resin-forming vinyl monomers in the presence of rubber present in latex form with the use of a combination of a peroxide of formula (I) ##STR1## where R.sup.1 signifies alkyl, cycloalkyl and aryl groups with 4 to 20 carbon atoms,

Elastic-thermoplastic graft polymers with improved properties

Elastic-thermoplastic graft polymers manufactured by radical emulsion polymerisation of resin-forming vinyl monomers in the presence of rubber present in latex form with the use of a combination of a peroxide of formula (I) ##STR1## where R.sup.1 signifies alkyl, cycloalkyl and aryl groups with 4 to 20 carbon atoms,

The present invention relates to surface-active peroxides which can be employed as emulsifying initiators for the preparation of low-electrolyte polymer dispersions having a low tendency to foam.

Growing community of inventors

Leverkusen, Germany

Martin Bohnenpoll