Bayer Aktiengesellschaft

Bayer Materialscience Ag

Getzner Werkstoffe Holding Gmbh

James-Michael Barnes

Manfred Schmidt

Hartmut Nefzger

Erika Bauer

Andreas Hoffmann

Hans-Dieter Ruprecht

Richard Kopp

Stefan Wershofen

Wieland Hovestadt

Gerhard Klein

Joachim Wagner

Jens Krause

Hans-Georg Wussow

Eduard Mayer

Ernst Felske

Michael Schneider

Thomas Schuetz

Heinrich Lurz

Horst Mews

Martin Dietrich

Dirk Wehowsky

The present invention relates to high-quality polyurethane and polyurethane urea elastomers which exhibit unique combinations of processing characteristics, oxidation resistance, mechanical and mechanical/dynamic properties in particularly demanding applications. These polyurethane elastomers and polyurethane urea elastomers are based on novel polycarbonate polyols.

Polyurethane and polyurethane urea elastomers based on polycarbonate polyols

Polyurethane prepolymers are described which are prepared from 2,4'-diiso-cyanate diphenylmethane (2,4&#x2032;-MDI), a polyol component and an aliphatic diisocyanate. These prepolymers can be cured with aliphatic, cycloaliphatic and/or aromatic amines to form a cured urethane elastomer. In comparison to cured urethane elastomers based on monomeric 2,4&#x2032;-MDI, these prepolymers provide elastomers with extended pour life, i.e. they exhibit a slower rate of viscosity buildup after curative and prepolymer are mixed which results in a reduced propensity to crack during the curing process and gives the opportunity to cast larger parts. In comparison to polyurea/urethanes prepared from cured TDI-prepolymers and which optionally include H12-MDI, the prepolymers of the invention have better health and safety aspects.

Polyurethanes cured with amines and their preparation

The present invention relates to NCO-terminated prepolymers that are stable to sedimentation, to a process for the production of these NCO-terminated prepolymers, and to the production of polyurethanes from these NCO-terminated polymers.

Process for the production of NCO prepolymers that are stable to sedimentation, and their use

The present invention relates to polyester polyols with low functionality and a process for their production, to prepolymers prepared from these polyester polyols and a process for their production, and to polyurethanes prepared from these polyester polyols and/or from these prepolymers, and to processes for their production. These polyester polyols are produced in a two-step process. In the second step of this two-step process, one or more cyclic ester monomers is reacted with one or more polyester polyols at low temperatures.

Polyester polyols, a process for the production thereof and the use thereof

The present invention relates to a method for preparing oligomeric aliphatic diols, polycarbonatediols based thereon and NCO-terminated prepolymers obtainable therefrom. The inventive compounds may find use in the preparation of polyurethanes.

Process for preparing oligomeric aliphatic diols, polycarbonatediols based thereon and prepolymers thereof

The polyester polyols according to the invention with an average equivalent weight in the range from 200 to 4,000, which were prepared by reacting &agr;,&ohgr;-dicarboxylic acids with butane 1,4-diol, hexane 1,6-diol, propane 1,3-diol or pentane 1,5-diol and with polyols having 3 to 6 hydroxyl groups, are used for the preparation of PUR pourable elastomers with improved resistance to hydrolysis.

Polyester polyols and the use of polyester for producing PUR cast elastomers that have an improved resistance to hydrolysis

This invention relates to a process for producing prepolymers, which contain isocyanate terminal groups and which have a very low content of free isocyanate starting materials, from polyester polyols and polyisocyanates.

Method for producing prepolymers containing isocyanate end groups, incorporating a small proportion of base isocyanates

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

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Breitscheid, Germany

James-Michael Barnes