Bayer Aktiengesellschaft

Hans-Dieter Ruprecht

Wolfgang Grimm

James-Michael Barnes

Manfred Schmidt

Gerhard Grogler

Peter Haas

Hartmut Nefzger

Richard Kopp

Otto Ganster

Jurgen Schwindt

Hermann Gruber

Hans-Georg Wussow

Erika Bauer

Hans-Joachim Meiners

Norbert Eisen

Heinz Muller

Klaus Recker

Alois Fehlbier

Paul T Henrichs

Gerhard Trummelmeyer

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

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

The coating of bodies rotating about an axis with a reaction mixture forming a polyurethane can be improved by making use of a sheet die disposed parallel to the axis of rotation of the body at an angle .alpha., whereby the rate of reaction of the reaction mixture and the relative movement are synchronized with the circumferential speed of the rotating body in such a way that the successive convolutions overlap in the form of scales and connect together seamlessly.

Method and device for coating a body rotating about an axis

Rotational molding process for insulating pipes

The present invention is directed to a process for the production of waterproof, fine-cell polyurethane elastomers having a density of about 300 to 800 kg/m.sup.3 by reacting

Process for the production of polysiloxane ionomers, polysiloxane

This invention relates to special combinations of polyurethane-urea-forming starting components which are suitable for corrosion-inhibiting wear prevention by casting, centrifugal casting or spraying. Said components are liquid, relatively low viscosity mixtures of polymer-containing or polyadduct-containing polypropylene oxide polyols and/or ethylene oxide-containing polypropylene oxide polyols having a small content of special, low-melting, readily soluble aromatic diamines and tertiary amine catalysts as component (A) which are reacted at room temperature with liquid polyisocyanates based on diphenyl methane diisocyanate or their NCO-prepolymers with polyether polyols as components (B).

Use of liquid, cold-hardening polyurethane-urea-forming components for

The instant invention is directed to a process for the production of polyurethane urea elastomers having a gross density of more than 200 kg/m.sup.3 comprising: casting a reaction mixture of

Process for the production of elastic, optionally cellular, polyurethane

The present invention relates to a process for preparing elastic laminates by admixing elastomeric granules with a moisture hardenable polyurethane binder and hardening the binder. The binder is formulated to have a workable viscosity at room temperature and to avoid crystallization at temperatures above about 0.degree. C. The binder is the reaction product of polyisocyanates of the diphenyl methane series having at least 20 wt. % of 2,4'-diisocyanatodiphenyl methane and di- and/or trihydroxy polyethers. The invention also relates to the binder composition itself and a process for preparing it. The binder has a viscosity of about 1000 to 15,000 cP at 20.degree. C and an NCO content of about 5 to 15 wt. %. It is prepared at an NCO to OH ratio of about 2:1 to 15:1 and at about 15.degree. to 100.degree. C.

Process for the production of sheet-like structures

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Kö'ln, Germany

Hans-Dieter Ruprecht