Bayer Aktiengesellschaft

Bayer Akteingesellschaft

Harald Selbeck

Rolf Dhein

Rolf-Volker Meyer

Hugo Vernaleken

Claus H Wulff

Uwe Hucks

Erhard Tresper

Werner Nielinger

Josef Merten

Dietrich Michael

Christian Lindner

Dieter Wittmann

Hans Rudolph

Rudolf Binsack

Karsten-Josef Idel

Uwe Westeppe

Hans-Detlef Heinz

Friedrich Fahnler

Wolfgang Cohnen

Heinz-Josef Fullmann

Martin Wandel

Otto Bendszus

August Bockmann

Peter-Rolf Muller

Heinz Bonten

Manfred Patheiger

August Horsthemke

Frank Weber

This invention relates to a process for the continuous extraction of polyamides, in which the residue of low molecular weight components left in the polyamide is very small. It also relates to a two-part extraction tube suitable for this purpose, in which the upper part is connected to the lower part by a transition tube of smaller diameter and a counterflow extraction is carried out in the upper part and a direct flow extraction in the lower part under particular conditions.

Process for the continuous, counter flow/direct flow extraction of

This invention relates to thermoplastically deformable branched aliphatic polyamides prepared by the hydrolytic polycondensation of lactams in the presence of small quantities of .alpha.-amino-.epsilon.-caprolactam (ACL) and approximately equivalent quantities of polycarboxylic acids (preferably dicarboxylic acids) and to a process for their preparation which is distinguished by considerably reduced polycondensation times without giving rise to cross-linked products. The process optionally in addition employs a solid phase after-condensation in which rapid further condensation takes place to the products with increased melt viscosity which are branched but are still soluble in m-cresol.

Alpha-amino-epsilon-caprolactam-modified polyamide preparation

The reaction of--preferably partially crystalline--polyamides with monoisocyanate or monoisocyanate precursors gives products having improved flowability, mould release and/or notched impact strength.

Polyamide modified with monoisocyanates

The invention relates to thermoplastic molding compositions showing improved properties, more especially improved dimensional stability and notched impact strength, particularly at low temperatures, in the form of a mixture of at least 35% by weight of a copolyamide containing polydiorganosiloxane carbonamide units and/or of a mixture of partly crystalline polyamides and (co)polyamides containing polydiorganosiloxane carbonamide units and from 1 to 65% by weight of graft products of vinyl polymers on rubbers. The invention also relates to the dimensionally stable molding compositions tough at low temperatures characterized above which additionally contain amorphous siloxane-free polyamides added in quantities of up to 64% by weight.

High-impact dimensionally stable polyamide molding compositions

Polyamide moulding materials which have been reinforced with unsized glass fibres and to which a flame-proof finish has been imparted by means of melamine or melamine cyanurate and which have a high glow wire resistance.

Flame-proof, glass fibre-reinforced polyamide moulding materials

Pulverulent red phosphorus stabilized with zinc fluoride and the use thereof as flame-retarding agent to thermoplastic moulding compositions.

Stabilized red phosphorus and the use thereof for flameproof,

Phosphoric acid esters are produced by the method of phase-interface condensation by reacting phosphorus oxyhalides, phosphorus pentahalides, phosphoric acid monoester dihalides or phosphoric acid diester halides with hydroxyaryl compounds in the presence of aqueous alkaline earth metal and/or alkali metal hydroxide solutions and organic water-immiscible solvents.

Process for the production of neutral phosphoric acid esters

Phosphoric acid triesters of the formula ##STR1## are produced in two or more stages by reacting phosphorus oxyhalides, phosphorus pentahalides, phosphoric acid monoester dihalides or phosphoric acid diester halides corresponding to the following general formula:

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Krefeld, Germany

Harald Selbeck