PROCESS FOR THE PRODUCTION OF POLYAMIDE MOULDED PARTS WITH IMPROVED CRYSTALLISATION BEHAVIOUR

摘要

The invention relates to a process for the production of a polyamide moulded part from a polyamide composition comprising 0.01-5 wt.% polyamide-4.6 and 99.99-95 wt.% of a polyamide with a melting point that is lower than that of polyamide-4.6. The polyamide composition is obtained by mixing in the melt of a blend of granules of the polyamide with the low melting point (A) and a composition (B) of the polyamide-4.6 in the polyamide with the low melting point, the polyamide-4.6 content of (B) amounting to 2-50 wt.% and B having been obtained at a temperature above the melting point of polyamide-4.6. The polyamide with a low melting point is preferably polyamide-6. The process results in a permanent 15 °C increase in the crystallisation onset temperature of nylon-6. A 30 % gain in cycle time relative to polyamide-6 nucleated with the aid of microtalc was realised for injection-moulding of relatively large articles.