Bayer Aktiengesellschaft

Bayer Materialscience Ag

Covestro Deutschland Ag

Jiangsu Synecoun Medical Technology Co., Ltd

Bayer Aktigensellschaft

Bayer Intellectual Property Gmbh

Covestro Intellectual Property Gmbh & Co. Kg

Allnex IP S.a.r.l.

Rolf Bachmann

Uwe Hucks

Franz Ferdinand Rhiel

Harald Blum

Martin Melchiors

Wieland Hovestadt

Steffen Kuhling

Johan Vanden Eynde

Wolfgang Fischer

Wolfgang Ebert

Jörg Hofmann

Claus H Wulff

Aurel Wolf

Thomas König

Thomas Fischer

Steffen Hofacker

Karl-Ludwig Noble

Jan Heijl

Herbert Witossek

Lothar Bäcker

Gunther Weymans

Michael Ludewig

Martin Ullrich

Michael Prein

Christian Kords

Hermann Kauth

Georg Ronge

Klemens Kohlgrüber

Gottfried Zaby

Silke Kratschmer

Volker Michele

Sigurd Buchholz

Christine Mendoza-Frohn

Heinrich Schuchardt

Matthias Wohak

Michael Traving

Maren Heinemann

Wolfgang Herrig

Bert Ruytinx

Stefanie Braun

Jurgen Kadelka

Horst Zwick

Lars Obendorf

Franky Bruynseels

Ursula Tracht

Klaus Schebesta

Achim Küpper

Björn Henninger

Arne Braun

Ekkehard Barth

Reiner Witkowski

Lutz Gottschalk

Stephan Laue

Maarten De Bock

Johann Seeba

Matthias Ruhland

Sebastian Schmidt

Claudia Willems

Udo Dünger

Gerald John

Edmund Dikow

Felix Cock

Antonio Ortiz

Somchai Kanjanasantisak

Marten Voelker

Josef Bartholomei

Evgeny Avtomonov

Marten VÖLKER

A process for preparing polycarbonate by the phase interface process in the presence of at least one catalyst, wherein immediately after the optionally first addition of the at least one catalyst, from 0.01 to 20 J/kg of mixing energy is introduced into the system comprising the at least one catalyst within a time of from 2 to 1200 s. A mixture, an organic phase, and a process for distributing at least one catalyst in a system comprising an organic phase and an aqueous phase are also disclosed herein.

Method for producing polycarbonate

The present invention relates to a method for producing polyether carbonate polyols by addition of one or more alkylene oxides and carbon dioxide to one or more H-functional starter substances in the presence of at least one DMC catalyst, in which the reaction is conducted in a main reactor () and a tubular reactor () connected as a post reactor downstream thereof, wherein the method is characterized in that at the outlet () of the tubular reactor () a temperature is set that is at least 10&#xb0; C. above the temperature in the inside of the main reactor (). The invention further relates to a device for carrying out said method.

Method for the production of polyether carbonate polyols and device therefor

The invention relates to an efficient continuous method for producing polycarbonates according to the phase interface method.

Method for producing polycarbonate according to the phase interface method

The present invention relates to an improved process for producing a biodegradable and/or absorbable silica sol material which is advantageous especially with regard to the reproducibility of the material, the rapidity of the synthesis and the possibility of being able to produce the silica sol material on an industrial scale. A further subject matter of the invention relates to a biodegradable and/or absorbable silica sol material which can be produced by the synthesis process according to the invention.

Process for producing a silica sol material

The invention relates to a continuous process for preparing radiation-curable prepolymers containing urethane groups, more particularly urethane acrylates.

Process for preparing radiation-curable prepolymers containing urethane groups

Continuous processes for preparing polycarbonates having a weight average molecular weight M, of 15,000 to 200,000 g/mol, the processes comprising reacting a dihydroxydiarylalkane and phosgene in the presence of a catalyst in a phase boundary process comprising: continuously dispersing in a disperser an organic phase comprising at least a portion of the phosgene and a solvent suitable for the polycarbonate and an aqueous phase comprising the dihydroxydiarylalkane, water and an alkali solution present in an amount of 1.5 to 2.5 moles per mole of the dihydroxydiarylalkane, to form a mixture; reacting the mixture in a first reactor with a residence time of less than 0.5 seconds; further reacting the mixture in a second reactor with addition of further alkali solution and, optionally, a chain terminator; and effecting further condensation in a third reactor with addition of further alkali solution and, optionally, a chain terminator, in the presence of the catalyst.

Phase boundary processes for preparing polycarbonates

The present invention relates to an improved process for preparing aliphatic oligocarbonate diols by transesterifying dimethyl carbonate (DMC) with aliphatic diols.

Preparation of aliphatic oligocarbonate diols

The invention relates to a method for producing polycarbonate according to the method for the transesterification of molten mass whereby bis-(hydroxyaryl) compounds (bisphenols) and diaryl carbonates are reacted by means of reactive rectification.

Reactive rectification

A continuous process for producing oligocarbonate is disclosed. The process entails in sequence the steps of a) reacting a dihydroxyaryl compound with a diaryl carbonate in the presence of a catalyst to obtain a melt and avoiding removal of released monohydroxyaryl compound and b) withdrawing the monohydroxyaryl compound by flash evaporation and c) heating the melt obtained under vacuum in an evaporator equipped with sump receiver and d) repeating at least once steps b) and then c) each at gradually increased temperatures and lowered pressures.

Process for producing oligocarbonates

Aqueous copolymers, a process for their preparation and their use in coating compositions

The invention relates to a two-step melt process for the production of thermoplastic, solvent-free, low-branching polycarbonates with low --OH terminal group content using a self-cleaning high-viscosity reactor.

Two-step process for the production of thermoplastic polycarbonate

The present invention provides a melt process for the manufacture of thermoplastic solvent-free polycarbonates with the use of a continuously operated tubular reactor for monophenol vaporization.

Process for the manufacture of thermoplastic polycarbonate

The invention relates to a process for the production of polycarbonates by the two-phase interfacial method in which deviations between measured and estimated variables are continuously minimized by means of a suitably selected observer or filter system on the basis of a process model with an empirical Mark-Houwink relation adapted to the process. The variables estimated by the observer/filter are converted into control variables which are used to set input streams of the production process. Product quality is kept constant, changes in load or set values are quickly intercepted and even disturbances not readily accessible to measurement are taken into account by the process control.

Process for the production of polycarbonate of constant viscosity

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Bergisch Gladbach, Germany

Rolf Bachmann