Basf Aktiengesellschaft

Basf Se Corporation

Reinhard Lang

Erich Beck

Gunter Pipper

Harro Petersen

Christoph Plachetta

Hans Renz

Wolfram Weiss

Edmund Keil

Adolf Nuber

Alfons Ludwig

Horst Schmidt

Jens Becker

Peter Hildenbrand

Thomas Sauer

Achim Gerstlauer

A process for continuously preparing copolyamides from lactams and salts of diamines and dicarboxylic acids, in which lactams together with salts of diamines and dicarboxylic acids are passed from the top downward through a vertical polymerization tube at polyamide-forming temperatures, which comprises

Process for continuously preparing copolyamides from lactams and salts of diamines and dicarboxylic acids

A process for continuous extraction of polyamide particles in an essentially vertical extraction column using an aqueous extractant comprises using an extraction column that is divided into two zones and performing an extraction with a recirculating 15-40% strength by weight aqueous &egr;-caprolactam solution in the first zone and then with countercurrent water at a from 5 to 40&deg; C. lower temperature in the second zone. The process provides for economical extraction of polyamides with a low level of monomers and oligomers.

Continuous polyamide extraction process

Radiation-curable binders which are obtained by reacting A) an amine/formaldehyde condensate having a molar ratio of formaldehyde to amino groups of from 1:1 to 2:1 with

Radiation-curable binders

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Neustadt, Germany

Reinhard Lang