Bayer Aktiengesellschaft

Other

Bayer Materialscience Ag

Hans-Georg Wussow

Hans-Georg Hoppe

Wolfgang Br&auml;uer

Friedemann Muller

Herbert Heidingsfeld

Wolfgang Brauer

Jurgen Winkler

Bernhard Schulte

Wolfgang Kaufhold

Willi Meister

Karl-Heinz Wolf

J&uuml;rgen Winkler

Friedemann M&uuml;ller

Werner Rasshofer

Richard Kopp

Hanns-Peter Muller

Stephan Kirchmeyer

Hans-Joachim Meiners

Henricus Peerlings

Hans Wagner

James-Michael Barnes

Hans-Dieter Ruprecht

Klaus Seel

Wolfgang Bräuer

Bodo Rehbold

Juergen Winkler

Wolfgang R&ouml;hrig

Wolfgang Braeuer

Govert Woeste

Steven C Manning

Eva Brigitte Eggeling

Eva Gestermann

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

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 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

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 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

Nonrigid, thermoplastic moulding compositions

Non-crystallizing N,N&prime;-disubstituted N-(2-hydroxyalkyl)-ureas are used as hydrolysis protection agents in plastics containing ester groups. These disubstituted hydroxy-alkylureas impart excellent protection from hydrolysis to plastics containing ester groups and can be added directly to the plastics to be stabilized without the addition of special solvents.

N,N&prime;-disubstituted N-(2-hydroxyalkyl)-ureas

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 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

A thermoplastsic molding composition comprising thermoplastic polyurethane resin and about 0.05 to 2 percent of a wax is disclosed. The composition which offers processing advantages, including release and cosmetic properties, is characterized in that the wax contains acylation products of hydroxy groups and of amino groups of amino alcohols.

Melt processable polyurethanes containing wax

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

A thermoplastic polyurethane urea prepared by reacting a reaction mixture of

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Düsseldorf, Germany

Hans-Georg Wussow