Basf Aktiengesellschaft

Basf Se Corporation

Basf Aktiengsellschaft

Michael Kopietz

Gerhard Heinz

Peter Ittemann

Claus-Ulrich Priester

Juergen Koch

Hartmut Zeiner

Wolfgang Eberle

Hermann Buchert

Peter Bassler

Hugo Fuchs

Josef Ritz

Ulrich Kalck

Simon A Jones

Philippe Desbois

Gerald Neubauer

Heinz Auer

Joachim Seibring

Jochen Engelmann

Ralf Neuhaus

Erwin Brunner

J&uuml;rgen Hofmann

Jens Becker

Hagen Stawitzki

Walter G&ouml;tz

Hans-Joachim Weis

Paul Pijl

Theodor Bruckmann

Alan Handerman

Helmut Horle

In a process for preparing a polyamide based on dicarboxylic acids and diamines in an extruder, a solid mixture comprising a monomer mixture composed of 50 mol % of dicarboxylic acid mixture composed of from 60 to 88 % by weight of terephthalic acid and from 12 to 40% by weight of isophthalic acid, in which up to 20% by weight of the dicarboxylic acid mixture may also be replaced by other dicarboxylic acids, and 50 mol % of hexamethylenediamine which may be up to 20% by weight replaced by other C-diamines, in a corotatory twin-screw extruder for a residence time of from 10 seconds to 30 minutes, is heated to a temperature in the range from 150 to 400&#xb0; C. while removing steam and if appropriate diamines through venting orifices.

Method for the production of polyamides in extruders

The invention relates to a process for pelletizing polymer melts, at above ambient pressure, in a pelletizing chamber into which a cutting apparatus has been inserted. In a first step, the pelletizing chamber is flooded with a gas which is inert toward the polymer melt and whose pressure is that at which the pelletizing process is carried out. The polymer melt is then injected into the pelletizing chamber. Finally, the gas is displaced from the pelletizing chamber via a liquid as soon as the polymer melt begins to flow through the cutting apparatus, this melt being cut into pellets.

Process for pelletizing polymer melts comprising low-boiling substances

Process for producing a polyamide based on a dicarboxylic acid and a diamine

Caprolactam is obtained from caprolactam-containing polymers in the presence of a base under reduced pressure by depolymerizing polymers which contain the repeating unit --[--N(H)--(CH.sub.2).sub.5 --C(O)--] or mixtures consisting essentially of

Obtaining caprolactam by cleavage of molten polycaprolactam

Caprolactam is obtained from caprolactam-containing polymers in the presence of superheated water by bringing polymers which contain the repeating unit

Process for producing caprolactam through hydrolytic cleavage of molten

Caprolactam is obtained from mixtures which contain polymers or thermoplastic molding materials having the repeating unit

A process for recovering caprolactam from oligomers and/or polymers of caprolactam comprises the following steps:

Recovery of caprolactam from oligomers and/or polymers of caprolactam

Thermoplastic molding compositions suitable for producing interior components for vehicles for the conveyance of passengers, in particular aircraft, which show a low smoke gas density and low heat release characteristics in the event of a fire, are based on a heat-resistant plastic which contains as a filler from 0.5 to 50 % by weight of an oxide of an element of main group III, IV or V, of a salt of an oxygen acid of an element of main group III, IV or V or of a compound which on heating forms such an oxide or salt.

Heat-resistant thermoplastic molding compositions

Thermoplastic molding compositions suitable for producing interior components for vehicles for the conveyance of passengers, in particular aircraft, which show a low smoke gas density and low heat release characteristics in the event of a fire, are based on a heat-resistant plastic which contains as a filler from 0.5 to 50% by weight of an oxide of an element of main group III, IV or V, of a salt of an oxygen acid of an element of main group III, IV or V or of a compound which on heating forms such an oxide or salt.

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Grunstadt, Germany

Michael Kopietz