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Christoph Sigwart

Rolf Hartmuth Fischer

Michael Hesse

Rainer Becker

Karsten Eller

Martin Haubner

Ulrich Steinbrenner

Eckhard Stroefer

Rolf-Hartmuth Fischer

Stephan Schlitter

Eugen Gehrer

Frank Stein

Gerd Heilen

Martin Weber

Rolf Pinkos

Christian Maletzko

Ulrich M&uuml;ller

Ulrich Mueller

Ekkehard Schwab

Hartmut Hibst

Hans Peter Rath

Ulrich E Muller

Andreas Tenten

Werner Schnurr

Klemens Flick

Steffen Maas

Gerhard Cox

Joachim Roser

Detlef Kratz

Lothar Franz

Matthias Dernbach

Joachim Thiel

Klaus-Dieter Plitzko

Markus Siegert

Neven Lang

Thomas Narbeshuber

Peter Lingelbach

Franz Josef Brocker

Anton Meier

Volkmar Menger

Stefan Käshammer

Gerhard Lange

Thomas Domschke

Jörg Erbes

Gerd Bohner

Matthias Dietrich

Hans-Juergen Weyer

Laszlo Szarvas

Shelue Liang

Daniel Heineke

Eckhard Ströfer

Nicolas Inchaurrondo

Gerd Linden

Christian Tragut

Hans-Jurgen Weyer

Tobias Kortekamp

Franz Niklaus Windlin

Peter Groll

Klaus-Peter Pfaff

Christof Palm

Manfred Barl

Arthur Höhn

Achim Gerstlauer

Stefan Kaeshammer

Walter Dörflinger

Klaus Harth

The present invention relates to a process for the production of low-halogen-content polybiphenyl sulfone polymers, to the resultant polybiphenyl sulfone polymers, to polybiphenyl sulfone polymers having less than 400 ppm content of polymer-bonded halogen, to thermoplastic molding compositions comprising these polybiphenyl sulfone polymers, and to their use for the production of moldings, of fibers, of films, of membranes, or of foams.

Method for producing low-halogen polybiphenylsulfone polymers

An integrated process for preparing trioxane from formaldehyde.

Integrated method for the preparation of trioxane from formaldehyde

A process for preparing polyoxymethylene homopolymers or copolymers () by homopolymerization or copolymerization of trioxane, starting from methanol (), in which

Process for preparing polyoxymethylene homopolymers or copolymers by homopolymerization or copolymerization of trioxane, starting from methanol

A process for separating trioxane from a feed stream I comprising formaldehyde, trioxane and water, in which

Method for separating tioxane from a trioxane/formaldehyde/water mixture by means of pressure change rectification

The present invention relates to a solid, acid catalyst for the preparation of polytetrahydrofuran, polytetrahydrofuran copolymers, diesters or monoesters of these polymers by polymerization of tetrahydrofuran in the presence of at least one telogen and/or comonomer, which has a BET surface area of at least 160 m/g and an acid center density of at least 0.05 mmol/g for pKvalues of from 1 to 6, to a process for preparing it and to a process for the polymerization of cyclic ethers over this catalyst.

Catalyst, its preparation and the polymerization of cyclic ethers over this catalyst

The invention provides a process for preparing polytetrahydrofuran, tetrahydrofuran copolymers, their monoesters or diesters and the monoesters or diesters of polytetrahydrofuran having a low color number in the presence of a catalyst, which comprises converting crude tetrahydrofuran which has been prepared in a manner per se into pure tetrahydrofuran by distillation, subsequently subjecting the latter to essentially complete hydrogenation and using the high-purity tetrahydrofuran obtained in this way for the polymerization directly after its preparation.

Method for producing polytetrahydrofurane having a low color indices

In a process for the single-stage preparation of polytetrahydrofuran and/or tetrahydrofuran copolymers having a mean molecular weight of from 650 to 5000 dalton by polymerization of tetrahydrofuran over an acid catalyst in the presence of at least one telogen and/or comonomer, the telogen and/or comonomer is added at at least two addition points in different segments of the polymerization apparatus.

Method for producing polytetrahydrofuran

A process is provided for improving the color number of polyhydric alcohols, especially trimethylolpropane, by catalytic hydrogenation, the polyhydric alcohol used in the hydrogenation having been purified by distillation following its preparation, wherein the hydrogenation is carried out in the presence of a macroporous supported heterogeneous catalyst containing, as the active metal, at least one metal of subgroups VII to X of the Periodic Table.

Color index of multivalent alcohols by hydrogenation

Polytetrahydrofuran, polytetrahydrofuran copolymers, diesters or monoesters of these polymers are prepared by polymerization of tetrahydrofuran in the presence of at least one telogen and/or comonomer, which is in the form of shaped catalyst bodies or catalyst particles having a volume of the individual shape of the body or particle of at least 0.05 mm, preferably at least 0.2 mm, in particular 1 mm, and has at least one of the features a) and b):

Catalyst and method for the production of polytetrahydrofuran

The invention relates to a catalyst which contains a catalytically active quantity of at least one oxygen-containing molybdenum and/or wolfram compound on an oxidic support material and which has been calcinated at temperatures of 400 to 900&#xb0; C. after the precursor compound of the catalytically active compounds have been applied to the support material or to a support material precursor. The transport pores for this catalyst each have a diameter of &#x3e;25 nm and a volume of at least 50 mm/g. The catalyst contains x &#x3bc;mol (wolfram and/or molybdenum)/mmolybdenum and/or wolfram, with 10.1&#x3c;x&#x3c;20.9 in relation to the finished catalyst, with the oxidic support material having a BET surface area of 135 to 220 m/g. Catalysts of this type are characterized by an acidity of at least 70 &#x3bc;mol/g at pKs&#x3c;&#x2212;3 in the dry state and are therfore very active. The invention also relates to a method for producing a catalyst of this type and to the preferred use thereof.

Catalyst and method for producing polytetrahydrofurane

In a process for preparing polytetrahydrofuran, tetrahydrofuran copolymers, diesters or monoesters of these polymers having a low color number, the polymers obtained by cationic polymerization of tetrahydrofuran are hydrogenated in the presence of a macroporous, supported heterogeneous catalyst comprising at least one metal of groups 7 to 10 of the Periodic Table of the Elements as active metal.

Method for the production of polytetrahydrofuran with low color index

Method for the single-step production of polytetrahydrofuran and tetrahydrofuran copolymers

A process for preparing halogen-free, reactive polyisobutene having a terminal double bond content of more than 50 mol % and an average molecular weight M of 280-10000 dalton by the cationic polymerization in the liquid phase of isobutene or hydrocarbon mixtures comprising isobutene comprises polymerizing at from &minus;30&deg; C. to &plus;40&deg; C. in the presence of a heterogeneous polymerisation catalyst comprising one or more oxides of the elements of transition groups V and VI of the Periodic Table of the Elements or in the presence of a heterogeneous polymerization catalyst comprising one or more oxidic compounds of one or more elements of transition groups V and VI of the Periodic Table of the Elements supported on a non-zeolitic oxidic support material which is not an oxygen-containing zirconium compound, the catalyst not containing a technically effective amount of halogen.

Method for producing halogen-free reactive polyisobutene

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Schriesheim, Germany

Christoph Sigwart