Covestro Deutschland Ag

Bayer Intellectual Property Gmbh

Arlanxeo Deutschland Gmbh

Bayer Aktiengesellschaft

Bayer Materialscience Ag

Covestro Intellectual Property Gmbh & Co. Kg

Bayer Technology Services Gmbh

Michael Bierdel

Thomas König

Ulrich Liesenfelder

Johann Rechner

Thomas Koenig

Klemens Kohlgrüber

Reiner Rudolf

Carsten Conzen

Johan Vanden Eynde

Jörg Kirchhoff

Andreas Seidel

Leslaw Mleczko

Aurel Wolf

Bert Ruytinx

Frank Bruynseels

Richard Weider

Achim Feldermann

Volker Michele

Sigurd Buchholz

Jorg Kirchhoff

Joerg Kirchhoff

Ing Johan Vaes

Helmut Meyer

Johan Vaes

Thomas Mrziglod

Birgit Mannel

Klemens Kohlgrueber

Birgit Derfuss

Jörg Krüger

Thomas Konig

Birgit Derfuß

Linus GÖRLITZ

A screw element which has an axially asymmetrical screw cross-sectional profile which has at least two construction points located within the screw cross-sectional profile is provided. The screw element is suitable for use in an extruder having two drive shafts which rotate in the same direction and at the same speed, in order to process or produce plastic masses as an extrudate. Also, an arrangement of two identical or different screw elements in an extruder having two drive shafts which rotate in the same direction and at the same speed is provided. An extruder which is equipped with two identical or different screw elements and has two drive shafts which rotate in the same direction and at the same speed is provided. Furthermore, the use of the screw element according to the invention for processing or producing plastic masses is provided.

Screw element having an axially asymmetrical screw profile which has at least two construction points located within the screw profile

Device and method for dispersing solids, liquids and gases in an extruder, having at least one shaft () and one housing (), wherein at least one disk () with recesses is attached to the shaft, which at least one disk co-rotates with the shaft, and a non-co-rotating disk () is arranged immediately adjacent to the disk either in a product flow direction or counter to the product flow direction, which non-co-rotating disk likewise has recesses, and wherein the co-rotating disk is connected to the rotating shaft and has a gap () with respect to the housing, and the non-co-rotating disk is connected to the housing and has a gap () with respect to the rotating core shaft.

Device and method for dispersing solids, liquids and gases in an extruder

A process for extruding plastic compositions is provided. The process comprises providing a multi-screw extruder with screw elements and conveying, kneading, mixing, degassing or compounding the plastic compositions in the multi-screw extruder using the screw elements.

Process for extruding plastic compositions

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 invention relates to mixing elements that have a larger number of basic geometric periods per section and an improved dispersing effect for multi-shaft screw extruders comprising screw shafts that co-rotate in pairs. The invention further relates to the use of the mixing elements in multi-shaft screw extruders, a corresponding screw extruder comprising the mixing elements, and a method for extruding kneadable materials.

Mixing elements having an improved dispersing effect

The present invention relates to new screw elements for multi-screw extruders with pairs of co-rotating and fully wiping screws.

Screw elements with improved dispersing action and low energy input

The invention relates to a process for extruding plastic compositions, in particular polymer melts and mixtures of polymer melts, above all thermoplastics and elastomers, particularly preferably polycarbonate and polycarbonate blends, also with the incorporation of other substances such as for example solids, liquids, gases or other polymers or other polymer blends with improved optical characteristics, with the assistance of a multi-screw extruder with specific screw geometries.

Method for extruding plastic materials

The invention relates to novel screw elements for multi-screw extruders with screw profiles co-rotating in pairs and being fully self-wiping in pairs, to the use of the screw elements in multi-screw extruders and to a process for extruding plastic compositions.

Screw elements for extruding plastic compositions

The present invention relates to screw elements with novel, tightly intermeshing, self-cleaning, co-rotating screw profiles for multishaft screw machines with pairs of co-rotating and fully abrading screw shafts, to the use of these screw elements in multishaft screw machines and to a method of generating these screw elements.

Screw elements with reduced energy input during the build-up of pressure

The present invention relates to a process for devolatilising polymer-containing media such as, in particular, polymer melts, polymer solutions and dispersions and also devolatilisation apparatuses for carrying out the abovementioned process.

Degassing method, degassing device and use of screw elements

The invention relates to a process for extruding plastic compositions. The process in particular relates to the conveying, kneading and/or mixing of plastic compositions, in particular of polymer melts and mixtures of polymer melts, above all thermoplastics and elastomers, particularly preferably polycarbonate and polycarbonate blends, also with the incorporation of other substances such as for example solids, liquids, gases or other polymers or other polymer blends.

Method for extruding plastic masses

The invention relates to an apparatus and a process for producing pigment-containing, in particular carbon-black-containing, polymer mixtures comprising polycarbonates and optionally elastomers, and/or other components, where the mouldings produced therefrom have, after the shaping process via injection moulding or via extrusion, improved surface properties and improved mechanical properties.

Apparatus and process for producing products from pigment-containing polymer mixtures

The present invention relates to a process for devolatilizing polymer-containing media such as, in particular, polymer melts, polymer solutions and dispersions and also devolatilisation apparatuses for carrying out the abovementioned process.

Growing community of inventors

Leverkusen, Germany

Michael Bierdel