Recyclates Made of Cast Polyamide 6 and Carboxilyc Acid for Blow Molding.

Cast polyamide 6 is anionically polymerized from ε-caprolactam. Its good properties are mainly caused by the higher molecular weights, compared to standard polyamide 6. Because of sprues and post-processing, a larger amount of scrap is produced. This scrap is typically incinerated without sufficient use of its high quality properties. However, cast polyamide 6 also offers great potential for material recycling, particularly if its high molecular weight can be retained. As cast polyamide decomposes during processing as well, it is necessary to add some agents during compounding. By adding a carboxylic acid during compounding, it is possible to adjust the molecular weight and thus the flowing behavior of the polyamide recyclate melt. The highly viscous recyclates are usable for blow molding applications. [ABSTRACT FROM AUTHOR]