Bayer Aktiengesellschaft

Armin Spaniol

Karlheinrich Meisel

Bernd Thiele

Christoph Holzner

Gerd-Friedrich Renner

Lars Obendorf

Hans Dahmen

Dietmar Fuchs

Branislav Boehmer

Thomas Huebbe

A process for the preparation of polymeric condensates, wherein the reaction mixture is fed at least once during the condensation reaction through a zone of high energy density which has an energy density of at least 10J/m.

Process for the preparation of polymeric condensates and their use

The present invention relates to phosphorus-containing compounds based on 1-hydroxypropane-1,3-diphosphonic acid and to the acid itself of general formula (I) ##STR1## in which M.sup.1, M.sup.2, M.sup.3, M.sup.4 and M.sup.5, independently of one another, each denote a radical from the series hydrogen, alkali metal, an equivalent of ammonium, alkyl- or hydroxyalkyl-substituted ammonium, a process for the preparation thereof, novel intermediates and the use thereof as a corrosion inhibitor, scale inhibitor and as a flame retardant.

Phosphorus-containing compounds based on 1-hydroxypropane-1,

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Bergisch Gladbach, Germany

Armin Spaniol