Bayer Aktiengesellschaft

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Benecke-kaliko Ag

Bayer Materialscience Ag

Bayer Aktiengesellschift

Hans-Georg Hoppe

Wolfgang Kaufhold

Hans-Georg Wussow

Herbert Heidingsfeld

Wolfgang Br&auml;uer

Friedemann Muller

Wolfgang Brauer

Jurgen Winkler

Bernhard Schulte

Henricus Peerlings

Rainer Ohlinger

Willi Meister

Heinz Pudleiner

Michael Kalbe

J&uuml;rgen Winkler

Wolfgang R&ouml;hrig

Hanns-Peter Muller

Hans Wagner

Karl-Heinz Wolf

Hans-Hinrich Kruse

Wolfgang Bräuer

Paul T Henrichs

Friedemann M&uuml;ller

Rolf Dhein

Peter Haas

Stephan Kirchmeyer

Herbert Hugl

Ulrich Liesenfelder

Joachim Wagner

Wilhelm Goyert

Wolfgang Grimm

Klaus K Onig

Bernd Willenberg

Juergen Winkler

Jürgen Winkler

Wolfgang Röhrig

Wolfgang Braeuer

J&uuml;rgen B&uuml;hring

Steven C Manning

Eva Brigitte Eggeling

Wolfgang Fleige

Jurgen Fahndrich

Friedemann Müller

Wolfgang Rohrig

The present invention relates to thermoplastically processable polyurethane elastomers (TPU) with tensile strengths of &#x3e;35 MPa (measured in accordance with EN ISO 527-3), with shrinkages of &#x3c;3% and with self-extinguishing properties based on the use of at least one flameproofing agent which can be built in, a process for their preparation and their use.

Thermoplastically processable polyurethanes (TPU) with self-extinguishing properties, a process for their preparation and their use

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

Movable transparent composite systems and a process for preparing the same

A thermoplastic moulding composition that contains an aliphatic thermoplastic polyurethane (TPU) resin is disclosed. The TPU is the product of a reaction of A) a diisocyanate reactant that contains predominantly hexamethylene diisocyanate, and B) a polyol reactant that contains polytetramethylene glycol and C) a chain extending reactant that contains primarily 1,6-hexanediol. The TPU that is further characterized in the equivalence ratio of A to B and NCO index exhibits improved properties.

Aliphatic thermoplastic polyurethanes and use thereof

A thermoplastic molding composition that contains an aliphatic thermoplastic polyurethane (TPU) resin is disclosed. The TPU is the product of a reaction of A) a diisocyanate reactant that contains predominantly hexamethylene diisocyanate, and B) a polyol reactant that contains polytetramethylene glycol and C) a chain extending reactant that contains primarily 1,6-hexanediol. The TPU that is further characterized in the equivalence ratio of A to B and NCO index exhibits improved properties.

A continuous process for the production of thermoplastically processable polyurethane elastomer is disclosed. The process comprise adding acid H compounds in an amount calculated to control and render constant the melt viscosity of the product. The inventive elastomer has constant melt flow behavior and high thermal stability.

Process for producing thermally stable thermoplastic polyurethanes

A molding composition comprising thermoplastic polyurethane is disclosed. The polyurethane is characterized in having ultimate tensile strength (UTS) and elongation at break (EAB) values after hot storage which are, each, at least 60% of the corresponding value before hot storage, glass transition temperature equal to or lower than &minus;50&deg; C., UTS and EAB values after hydrolytic storage which are, each, at least 80% of the corresponding value before hydrolytic storage, and Shore A hardness of 70 to 95. The polyurethane is a product of a reaction comprising an aliphatic diisocyanate, a mixture of polyols and a chain extender and contains a UV stabilizer, an antioxidant and an optional anti-hydrolysis agent.

Aliphatic thermoplastic polyurethanes, a process for producing them and the use thereof

Mouldings of thermoplastic polyurethanes exhibiting reduced fogging

A mixture of hydroxy-terminated hydrocarbons useful as a mold release agent for polymers is disclosed. The polymers suitable in the present context are the ones prepared by polyaddition or polycondensation, in particular, thermoplastic polyurethane and polyurethane urea.

Thermoplastic resins having incorporated mold release agents

A process for producing a thermoplastic polyurethane film by means of sintering a particulate thermoplastic polyurethane in a heated mold, is described. The thermoplastic polyurethane has: (i) a melt index of 20 to 100, measured at 190&deg; C. and under an applied force of 21.2 N; (ii) a relative solution viscosity of 1.15 to 1.45, the relative solution viscosity being determined by, measuring the viscosity (a) of a solution of 0.4 grams of the thermoplastic polyurethane in 99.7 grams N-methyl-2-pyrrolidone containing 0.1% dibutylamine at 25&deg; C., measuring the viscosity (b) of N-methyl-2-pyrrolidone containing 0.1% dibutylamine at 25&deg; C., and dividing viscosity (a) by viscosity (b); and (iii) a Shore hardness of 80 to 98.

Process for preparing soft, elastic polyurethane

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

A light-colored thermoplastic molding composition comprising a polyurethane elastomer is disclosed. The polyurethane which is the reaction product of at least one polyol, at least one organic diisocyanate and at least one polyol chain extender contains one or more pentaerythritol diphosphites color stabilizers conforming to a specific formula exhibits improved color stability and improved processability. The process for preparation entails introducing the stabilizer before the reaction has been completed.

Thermoplastically processable polyurethane elastomers having an improved intrinsic color

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 light-stable, sinterable particulate thermoplastic molding composition is described. The thermoplastic compositions of the present invention consist essentially of: (i) a resinous blend of, (a) thermoplastic polyurethane, and (b) a member selected from at least one of a number of recited copolymers, e.g., a styrene-acrylonitrile copolymer; (ii) a UV stabilizer; and (iii) an antioxidant. The thermoplastic polyurethane (a) is prepared from an aliphatic or cycloaliphatic diisocyanate. The molding compositions are suitable for the preparation of textured sintered films, e.g., by the powder-slush process, having improved tactile properties that, for example, may be used in the fabrication of vehicle interior trim components and vehicle air bags.

Aliphatic, sinterable, thermoplastic polyurethane molding compositions

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Leichlingen, Germany

Hans-Georg Hoppe