Bayer Aktiengesellschaft

Jurgen Gronen

Hanns P Muller

Manfred Schmidt

Bernhard Jansen

Helmut Woynar

Eduard Mayer

A process for the production of polyisocyanates having a biuret structure, comprising continuously combining organic diisocyanates having aromatically attached isocyanate groups in a mixing chamber with organic diamines having aromatically attached amino groups in a molar ratio of at least 8:1 to form a reaction mixture; and reacting said reaction mixture at a temperature of above 180.degree. C., wherein a residence time of said reaction mixture in the mixing chamber from when said organic diisocyanates and said organic diamines are combined is at most 60 seconds.

Process for the production of polyisocyanates having a biuret structure

This invention relates to polyurethane elastomers produced by the reaction of polyisocyanates with polyesterpolyether polyols (diester-polyether diols) using the reaction injection molding process (RIM).

Polyurethane elastomers prepared from aliphatic polyisocyanates and

The present invention relates to the use of organic compounds which contain epoxide groups and which are subjected to a heat treatment at 30.degree. to 150.degree. C. in the presence of an alkylating agent, as auxiliary substances to increase the weather resistance of molded plastic parts. These molded parts are produced by the reaction injection molding technique and the process comprises reacting reaction mixtures based on polyioscyanate addition products.

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Overath, Germany

Jurgen Gronen