Bayer Aktiengesellschaft

Other

Herbert Heidingsfeld

Hans-Georg Hoppe

Jurgen Winkler

Willi Meister

Friedemann Muller

Wolfgang Brauer

Bernhard Schulte

Hans-Georg Wussow

Wolfgang Kaufhold

Wolfgang Br&auml;uer

Gottfried Zaby

Helmut Judat

Henricus Peerlings

Hans Wagner

Wolfgang Bräuer

Wolfgang R&ouml;hrig

Ernst Orthmann

Peter Hoeltzenbein

Klaus Wulff

Rolf Dhein

Heinz Pudleiner

Hanns-Peter Muller

Herbert Hugl

Hermann Perrey

Ulrich Liesenfelder

Wilhelm Goyert

Michael Kalbe

Ludwig Trabert

Rainer Ohlinger

Karl-Heinz Wolf

J&uuml;rgen Winkler

Jürgen Winkler

Friedemann M&uuml;ller

Wolfgang Röhrig

Eva Brigitte Eggeling

J Urgen Winkler

Friedemann M Uller

Wolfgang Br Auer

Friedemann Müller

The present invention relates to a multi-stage process for the continuous preparation of thermoplastically processable polyurethanes with improved processing properties based on various polyols.

Continuous preparation of thermoplastically processable polyurethanes

Process for the continuous preparation of thermoplastically processable polyurethane elastomers with improved softening properties is disclosed. The process is carried out in a tubular reactor at a ratio of the circumferential speed of the stirrer (in m/sec) in the tubular reactor and the throughput (in g/sec) of &#x3e;0.03 m/g.

Process for the continuous preparation of thermoplastically processable polyurethanes with improved softening properties

The present invention relates to a process for the production of molding compositions, which can easily be released from the mold. These molding compositions comprise thermoplastic polyurethanes with a hardness of 45 to 65 Shore A, with good mechanical properties, with low shrinkage and good low temperature properties.

Process for the preparation of soft, low-shrinkage, thermoplastic polyurethane elastomers which can be easily released from the mold

A thermoplastic composition comprising aliphatic polyurethane is disclosed. The composition is charactrized in having a post weathering yellow value lower than 20 and good hardness and softening temperature values both before and after weatering for 504 hours in accordance with ISO 4892.

Aliphatic thermoplastic polyurethanes, processes for their preparation and their use

Polyurethane moulding compositions which can be melt processed in the form of sintering powders suitable for the preparation of grained sintered films and which are prepared exclusively from linear aliphatic components are described. The polyol component is composed of 30 to 80 parts by weight of an aliphatic polycarbonate diol with an average molecular weight {overscore (M)} of 1000 to 2200 and 70 to 20 parts by weight of a polybutane diol adipate and/or a polycaprolactone diol with an average molecular weight {overscore (M)} of 1000 to 2400. Moreover, the mixture contains 1,6-hexamethylene diisocyanate in an equivalence ratio of 2.3:1.0 to 6.2:1.0, based on the polyol mixture and butane-1,4-diol as chain extender, the equivalence ratio of the butane-1,4-diol based on the poly mixture being 1.3:1.0 to 5.2:1.0.

Aliphatic, low-emission thermoplastic polyurethane molding materials suitable for sintering

A process for the continuous preparation of melt processable polyurethane elastomers having improved softening behavior is disclosed. The process entails reacting a polyisocyanate, a polyol and a chain extender, which have a temperature of at least 170&deg; C., in a static mixer, wherein the reaction mixture is prepared. The reaction mixture is then metered into an extruder into which optional auxiliaries and/or further components are fed.

Process for the continuous preparation of melt processable polyurethanes with improved softening behaviour

The invention relates to a process for the continuous preparation of melt-processable polyurethanes, wherein an isocyanate-terminated prepolymer is intensively mixed with chain extender at temperatures of <200&deg; C., and the mixture obtained is converted to melt processable polyurethane in a twin screw extruder under quasi-adiabatic reaction conditions.

Continuous preparation of melt-processable polyurethane in a twin screw extruder

A process for the continuous production of a thermoplastic molding composition containing a mixture of a TPU and a thermoplastic (co)polymer is disclosed. The process comprises

Process for preparing TPU molding compositions

A process for the preparation of a polyurethane-urea elastomer having a mole ratio of NCO groups to all active hydrogen atoms in the range of 0.9 to 1.2 is disclosed. The process comprise reacting (A), (B) and (C.2) for form an NCO-containing prepolymer and then reacting said prepolymer with (C.1) and (D). Accordingly (A) is 5-isocyanato-1-(isocyanatomethyl)-1,1,3-trimethylcyclohexane or bis-(4-isocyanatocyclohexyl)-methane,(B) is polytetrahydrofuran or hexanediol polycarbonate and (C.2) is a chain extender. (C.1) is 5-amino-3-amino-methyl-1,3,3-trimethylcyclohexane or bis-(4-aminocyclohexyl)-methane and (D) is a molecular weight regulator. The elastomer thus produced is particularly suitable for the preparation of moldings, films, flexible tubing (for medical purposes) and catheters.

Cycloaliphatic thermoplastic polyurethane elastomers

A thermoplastic molding composition comprising a thermoplastic polyurethane and a wax mixture is disclosed. The polyurethane is a product of an organic diisocyanate, a linear, hydroxyl-terminated polyol and a diol or diamine chain extender. The wax mixture contains a first mixture of an ester of a C.sub.10-45 aliphatic carboxylic acid and a diol, and an alkali metal or alkaline earth metal salt of a C.sub.10-45 aliphatic carboxylic acids, and at least one member selected from the group consisting of fatty acid ester, fatty acid amide, fatty acid ester amide and polyethylene wax.

Melt-processable polyurethanes containing special wax mixtures

The invention relates to the continuous production of polyurethane and polyurethane urea prepolymers by reaction of polyisocyanates with isocyanate-reactive compounds in a mixing nozzle.

Process for the continuous production of polyurethane and polyurethane

The present invention relates to a process for the continuous production of thermoplastically processable polyurethanes having improved processing behaviour, wherein in a multistep reaction

Process for the continuous production of thermoplastically processable

Thermoplastically processable polyurethane elastomers are produced by a process of

Multistage process for production of thermoplastic polyurethane

A process for the continuous production of a thermoplastic molding composition containing a mixture of TPU and a (co)polymer is disclosed. The process comprises

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Frechen, Germany

Herbert Heidingsfeld