Arlanxeo Deutschland Gmbh

Lanxess International Sa

Lanxess Deutschland Gmbh

Udo Wiesner

Hanns-Ingolf Paul

Rolf Feller

Ricarda Leiberich

Joachim Ritter

John Lovegrove

Paul Wagner

Adam Gronowski

Jörg Kirchhoff

Carsten Kreuder

Holger Luesgen

Thomas König

Klemens Kohlgrüber

David Thompson

Paul Nguyen

Thomas Koenig

Jorg Kirchhoff

Ursula Tracht

Joerg Kirchhoff

Michael Berger

Nicolai Dieltiens

Luc Timmermans

Holger Lusgen

Klemens Kohlgrueber

John George Lovegrove

Adam A Gronowski

Holger LÜSGEN

John George Arnold Lovegrove

The invention relates to an efficient process for the preparation of isoolefin polymers such as polyisobutene or butyl rubber by polymerization of isobutene and optionally further monomers in the presence of an initiator system prepared by continuously contacting at least one boron or aluminium compound and at least one initiator.

Process for the production of isoolefin polymers with improved initiator system preparation

The invention relates to a reactor and to a method for continuous polymerization, in which said reactor for the continuous production of polymers, particularly synthetic rubbers, contains at least one substantially tubular reactor housing (), wherein said reactor housing () has a drive shaft () that is connected to at least one agitator () arranged such that it can rotate inside the reactor housing (), and the agitator contains at least one, and preferably two, three or four helical mixing elements () which are designed to be preferably close to the wall or to come into contact with the wall.

Reactor and method for continuous polymerization

The present invention relates to water and solvent-free halogenated butyl rubber products as well as a process for the production thereof.

Process for the production of water and solvent-free halobutyl rubbers

The invention relates to a method for degassing elastomer-containing media, such as elastomer solutions and dispersions in particular, and degassing devices () for carrying out said method.

Method for removing volatile components from elastomer-containing media and degassing devices therefor

The invention relates to an energy efficient, environmentally favorable process for the preparation of brominated butyl rubbers, that uses a bromination agent and a oxidizing agent in order to enhance the utilization of bromine contained in the bromination agent. In a preferred embodiment a common medium for both solution polymerization and subsequent bromination of the rubber is employed.

Process for producing brominated butyl rubber

The present invention relates to a method to control a liquid feed stream carried out by measuring at least one spectrum of the liquid feed stream comprising an initiator or catalyst, determining its activity using a predictive model on the basis of said spectrum and adjusting the feed streams and/or the preparation conditions of the feed stream comprising the initiators or catalysts in order to attain or maintain a desired level of total activity. In a further aspect the invention relates to a controlled process for the preparation of polymers in a polymerization reactor by contacting liquid feed streams comprising monomers and initiators or catalysts, whereby the control of the feed streams entering the polymerization reactor and/or the initiator or catalyst preparation is carried out by measuring at least one spectrum of the liquid feed stream comprising an initiator or catalyst, determining its activity using a predictive model on the basis of said spectrum and adjusting the feed streams and/or the preparation conditions of the feed stream comprising the initiators or catalysts in order to attain or maintain a desired level of total activity within the polymerization reactor. More particularly, the invention relates to a method for controlling the activity of aluminum containing initiators in a process for the co-polymerization of isolefins and multiolefins, in particular isobutylene and isoprene. The present invention further to device and a chemical plant suitable to operate said process.

Activity monitoring and polymerization process control

The invention relates to an energy efficient, environmentally favorable process for the preparation of halogenated rubbers, in particular chloro- and bromobutyl rubber, that uses a common aliphatic medium of specific composition for both solution polymerization and subsequent halogenation of the rubber. More particularly, the invention relates to a process that employs a common aliphatic medium for both solution polymerization and halogenation of rubber with intermediate removal of un-reacted monomers.

Common solvent process for producing high molecular weight halogenated rubber

The present invention relates to a reactor () and a process for continuous polymerization, where the reactor () has an essentially tubular reactor housing (). The reactor housing () has a drive () which runs along the geometric central axis () in the flow direction () and is configured as a central shaft. A rotatably arranged scraper or wiper () is provided within the reactor housing (); the scraper or wiper () has at least one scraper or wiper blade () to run along an interior side () of the reactor housing (). The rotational movement of the scraper or wiper () results in radial mixing of a stream within the reactor housing () which dominates gravity effects and, by virtue of shaping of the scrapers or wipers, optionally makes plug flow or a loop flow or backflow within the reactor () or else via an additional external pumped circulation system () possible. This allows the reaction conditions in the axial direction of the reactor housing () to be predicted and individually suitable reaction conditions to be set and controlled along the reactor housing, so that, in particular, a desired molecular weight distribution can be set.

The invention is directed to an extruder (), particularly for extruding a synthetic rubber product, which comprises a barrel (), one or several extruder elements (), particularly one or several extruder screws and/or a kneader elements (), arranged inside the barrel () for conveying the product, optionally an inlet port for feeding a stripping agent into the barrel () and an outlet port for removing volatile compounds from the product and, where applicable, the stripping agent. According to the invention a perforated die plate () is fixed to the barrel () in flow direction before the outlet port. Since the die plate () is not fixed to the extruder elements () but to the barrel () a circumferential clearance between the die plate () and the barrel () is prevented so that no extruded material is passing the die plate () radially outside. Parts of the extruded material comprising a low surface area to volume ratio are prevented so that the evaporation of volatile compounds is facilitated.

Extruder with integrated die plate and method for degasing polymer mixtures

The present invention relates to a reactor () and a process for continuous polymerization, where the reactor () has an essentially tubular reactor housing (). The reactor housing () has a drive () which runs along the geometric central axis () in the flow direction () and is configured as a central shaft. A rotatably arranged scraper or wiper () is provided within the reactor housing (); the scraper or wiper () has at least one scraper or wiper blade () to run along an interior side () of the reactor housing (). The rotational movement of the scraper or wiper () results in radial mixing of a stream within the reactor housing () which dominates gravity effects and, by virtue of shaping of the scrapers or wipers, optionally makes plug flow or backflow within the reactor () possible. This allows the reaction conditions in the axial direction of the reactor housing () to be predicted and individually suitable reaction conditions to be set and controlled along the reactor housing, so that, in particular, a desired molecular weight distribution can be set.

Growing community of inventors

Bornheim, Germany

Udo Wiesner