FREMGANGSMAADE TIL FREMTILLING AF FORMEDE POLYAMIDER MED INTETRAL SKUMSTOFSTRUKTUR

At least one lactam having at least 6 ring members is subjected to an activated anionic polymerisation in the presence of a combination of a strongly alkaline catalyst and a weakly alkaline catalyst. The molar ratio of the catalysts is between 2:1 and 20:1, the concentration of the weakly alkaline c...

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Bibliographische Detailangaben
Hauptverfasser:	FRIEDRICH FAHNLER, KURT SCHNEIDER
Format:	Patent
Sprache:	dan
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS MAKING GRANULES OR PREFORMS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	At least one lactam having at least 6 ring members is subjected to an activated anionic polymerisation in the presence of a combination of a strongly alkaline catalyst and a weakly alkaline catalyst. The molar ratio of the catalysts is between 2:1 and 20:1, the concentration of the weakly alkaline catalyst, based on the lactam, is between 0.01 and 0.5 mol %, and the molar ratio of strongly alkaline catalyst to activator is between 1:3 and 3:1. One part of the lactam, mixed with the activator, is melted in a reservoir vessel while the remainder, mixed with the catalyst combination, is melted in a separate reservoir vessel. The melts are metered by means of metering pumps and two injection nozzles into the moulding tool where they are mixed countercurrently and polymerised. This produces unshrunk polyamide mouldings having an excellent integral foam structure.