Block amide! copolymer prepn. - by dissolving oligo-amide in lactam melt and polymerising the soln. by anionically activated polymerisation

Block copolyamides are prepd. by dissolving oligoamides in a lactam melt and polymerising the soln. by anionically activated polymerisation. The oligoamide-lactam solns. pref. contain >=40 wt. % lactam, contg. >=5 ring members. Prods. include moulded articles, semi-finished materials, containe...

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Hauptverfasser:	BRASSAT,BERT,DR, VERNALEKEN,HUGO,DR, NIELINGER,WERNER,DR
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	Block copolyamides are prepd. by dissolving oligoamides in a lactam melt and polymerising the soln. by anionically activated polymerisation. The oligoamide-lactam solns. pref. contain >=40 wt. % lactam, contg. >=5 ring members. Prods. include moulded articles, semi-finished materials, containers and pipes. Continuous polymerisation in an extruder allows prodn. of bristles, pipes and foils. The oligoamides need not contain only amino end-gps. No weak positions occur in the polymer chain. Polyamides having relative viscosities 3 (1.01-3) may also be used. Crystallinity of prods. decreases with quantity of added oligoamide. Transparent prods. having a lower softening point and improved solubility can be obtd.