Lenzing Aktiengesellschaft

Clemens Bisjak

Heinrich Firgo

Gert Kroner

Hartmut Rüf

Peter Dobson

Karin Kämpf

Andreas Gürtler

Hartmut Ruf

Christian Schuster

A process for the production of an oxidized polymer from a tetrakis hydroxyalkyl phosphonium compound comprising NHor at least one nitrogen compound comprising at least one NHor at least two NH groups, or NH, comprising the steps of: (a) reacting at least one tetrakis hydroxyalkyl phosphonium compound with NHor at least one nitrogen compound in order to obtain a precondensate, wherein the molar ratio of the tetrakis hydroxyakyl phosphonium compound to the nitrogen compound is in the range of 1: (0.05 to 2.0), preferably in the range of 1: (0.5 to 1.5), particularly preferably in the range of 1: (0,65 to 1.2), (b) crosslinking the precondensate obtained in process step (a) with the aid of ammonia to form a crosslinked polymer, (c) oxidizing the crosslinked polymer obtained in step (b) by adding an oxidizing agent to the oxidized polymer, wherein, in step (b), the precondensate from step (a) and the ammonia are each injected by means of a nozzle into a reactor space enclosed by a reactor housing onto a common collision point.

Flame retardant cellulosic man-made fibers

The invention relates to flame-retardant cellulosic man-made fibers containing a flame-retardant substance in the form of an oxidized condensate of a tetrakis hydroxyalkyl phosphonium salt with ammonia and/or a nitrogenous compound which contains one or several amine groups whereby the fiber has a tenacity of more than 18 cN/tex in a conditioned state. Production process and the use of the fibers according to the invention are further objects of the invention.

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Clemens Bisjak