Bayer Aktiengesellschaft

Bayer Materialscience Ag

Stefan Grabowski

Stefan Wershofen

Rüdiger Musch

Knut Panskus

Aurel Wolf

Hermann-Josef Weidenhaupt

Torsten Hagen

Richard Adamson

Arno Nennemann

Daniel Koch

Volker Wege

Markus Dugal

Heinz-Herbert Müller

Thiemo Marx

J&uuml;rgen Ackermann

Di- and polyamines of the diphenylmethane series are produced by

Process for the production of di- and polyamines of the diphenylmethane series

Di- and polyamines of the diphenylmethane series are prepared by a) mixing a first portion of aniline with an acid catalyst, b) mixing a second portion of aniline with formaldehyde, and c) mixing and reacting the mixtures prepared in each of steps a) and b). The diamines produced by this process may then be phosgenated to produce the corresponding di-/polyisocyanate.

Process for the preparation of di- and polyamines of the diphenylmethane series

The present invention relates to a process for the preparation of di- and polyamines of the diphenylmethane series, and to the preparation of di- and poly-isocyanates of the diphenylmethane series from these di- and poly-amines. The di- and poly-amines of the diphenylmethane series are prepared by the reaction of aniline and formaldehyde in the presence of hydrochloric acid. In with the present invention, the hydrochloric acid employed contains less than 0.001 wt. % of metal ions which are divalent and/or more than divalent.

Water-containing compositions containing polychloroprene particles, zinc oxide particles having an average particle size of less than 150 nm and water. The compositions can be used as adhesives and/or sealants.

Aqueous compositions based on polychloroprene

Solvent-containing compositions based on polychloroprene, and solvent-containing zinc oxide dispersions which are stable in storage, that can be used in adhesive and sealant compositions. The compositions can be prepared by mixing the polychloroprene composition and zinc oxide dispersion and optionally adding conventional adhesive auxiliaries and/or additives and optionally adding an additional solvent.

Solvent-containing compositions based on polychloroprene

The invention relates to sulfur-containing oligosiloxanes which are liquid at &minus;25-100&deg; C., processes for their preparation and their use in silica-containing rubber mixtures which can be crosslinked with sulfur.

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Dormagen, Germany

Stefan Grabowski