Lanxess International Sa

Bayer Materialscience Ag

Lanxess Deutschland Gmbh

Other

Bayer Intellectual Property Gmbh

Covestro Deutschland Ag

Arlanxeo Deutschland Gmbh

Arlanxeo Switzerland S.a.

Jörg Kirchhoff

Hanns-Ingolf Paul

Thomas König

Rolf Feller

John Lovegrove

Paul Wagner

Klemens Kohlgrüber

Udo Wiesner

Michael Bierdel

Adam Gronowski

Ricarda Leiberich

Joachim Ritter

Steffen Kühling

Dirk Van Meirvenne

Christoph Gürtler

Johann Rechner

Ulrich Liesenfelder

Johan Vanden Eynde

Dana K Adkinson

Sven Brandau

Michael Klimpel

Rainer Bellinghausen

Melanie Möthrath

Bert Ruytinx

Peter Weuta

Frank Bruynseels

Johan Vaes

Werner Bäcker

Phil Magill

Ing Johan Vaes

Ido Schwarz

Andreas Jupke

Jens Hepperle

Florian Forner

Martin Hecker

Klemens Kohlgrueber

John George Arnold Lovegrove

An extruder system for degassing a mixture, comprising a first extruder, a second extruder arranged downstream of the first extruder and a transfer zone formed between these extruders, characterized by a pressure regulating device which can regulate the pressure at the outlet of the first extruder.

Extruder system with pressure regulating device

The invention relates to polycarbonates with extremely low residual levels of volatile constituents and thermal degradation products, and also improved optical properties, especially Yellowness Index (YI) and good thermal stability, from solvent-containing polymer melts. The invention further relates to an apparatus and a process for preparing these polycarbonates with the aid of a devolatilizing extruder with at least three devolatilizing zones, and zones for introducing entraining agent into dispersion are present upstream of at least three devolatilizing zones.

Ultra-high purity polycarbonates having good inherent color and thermal resistance and a device and a method for producing the same

The present invention relates to water and solvent-free polymers, in particular water and solvent-free synthetic rubber products like non-halogenated and halogenated butyl rubber products as well as a process for the production thereof. The invention further relates to a device suitable to accomplish said process.

Process for the production of water and solvent-free polymers

The invention relates to an energy efficient, environmentally favourable process for preparing water and solvent-free rubber ionomers and/or polymer nanocomposites comprising said rubber ionomers.

Process for the production of rubber ionomers and polymer nanocomposites

The present invention relates to specific water and solvent-free nitrile rubbers having specific functional groups and/or end groups, a process for the production thereof and the use thereof. This process involves removing volatile compounds from a fluid (F) containing (1) at least one nitrile rubber and (2) at least one volatile compound, wherein the process comprises at least the steps of a.) treating the fluid (F) in at least one conversation unit, b.) retreating the concentrated fluid from step a.) in at least one retreating unit and c.) feeding the retreated concentrated fluid from step b.) into at least one retreating unit.

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

The invention relates to a device for dispersing gas into a liquid. The devise has a number n of successive zones Z, Z, . . . , Zhaving static mixing elements, wherein each zone Zhas a length Land an effective diameter D. The mechanical energy input Et, which is standardized to the particular ratio L/Dand acts on the gas/liquid mixture, increases from zone to zone in the flow direction. In this connection n is a whole number greater than or equal to 3 and i is an index which runs through the whole numbers from 1 to the number n of zones. The invention further relates to a method for dispersing gas into a liquid using the device according to the invention.

Device and method for gas dispersion

An integrated process for the solution polymerization and subsequent halogenation of butyl rubber in a common medium is disclosed. The process comprises providing a solution polymerization reactor containing a C6 medium mixed with a monomer mixture comprising at least an isoolefin monomer and a multiolefin monomer in a mass ratio of monomer mixture to medium of from 61:39 to 80:20. Once polymerized, residual unreacted monomer mixture is separated from the rubber solution using a distillation process. The residual monomers may then be purified and recycled back into the reactor. The separated rubber solution is then halogenated. The process obviates the need for separating the rubber from the medium following polymerization, then re-dissolving it in another solvent for halogenation, thereby saving energy cost. The process optionally employs heat exchangers for the reactor feed streams to further reduce energy consumption.

Common solvent process for producing high molecular weight halobutyl 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.

Reactor and method for continuous polymerization

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 invention relates to novel screw feed elements for multi-shaft screw feed machines having screw feed profiles rotating in the same direction in pairs and precisely abrading in pairs, to the use of the screw elements in multi-shaft screw feeding machines and to a method for extrusion of viscoelastic masses.

Screw feed elements for extrusion of viscoelastic masses

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.

The present invention provides a process for preparing cyclic 1,3-keto esters in the absence of solvent, using solid-state or high viscosity reactors.

Process for preparing cyclic ketones

A process for the isolation of polycarbonate produced by the interfacial polymerization process is disclosed. Accordingly, the process entails (a) evaporating the organic solvent from the solution that contains solvent and polycarbonate to obtain a material system that contains 90 to 99.95% polycarbonate, the percent being relative to the weight of the system, and (b) passing the material system through inlet openings of a separating vessel to obtain a plurality of streams of polycarbonate, on entry into the inlet openings said material system being supersaturated with volatile constituents to an extent of at least 1 bar and having a temperature of 250&#xb0; to 340&#xb0; C. and a flow rate of 0.1 to 20 kg/hour, and (c) degassing the streams in the separating vessel wherein the pressure is 0.1 to 20 mbar to effect degassing of the polycarbonate.

Process for the production of polycarbonate

The invention describes a process for the preparation of polycarbonate. The process includes

Process for the preparation of polycarbonate

Growing community of inventors

Kö'ln, Germany

Jörg Kirchhoff