FIELD: chemistry.
SUBSTANCE: method for producing a moulded polyamide consists in that, at least, one lactam melt with an anionic polymerization catalyst and optionally a tertiary amine co-activator and/or dibutyltin dilaurate is mixed with, at least, one lactam melt with a biuret polymerization activator or uretdione, and, if necessary, the aforementioned co-activator. The polymerization is then carried out in a mould at a temperature of, at least, 80°C to 130°C, preferably of 110°C to 130°C. Herewith the co-activator must be contained in, at least, one of the lactam melts. If necessary, a lactam melt with a co-activator can be introduced before polymerization. The moulded polyamide is used to make rollers, preferably for passenger elevators, and preforms, preferably containers, gears, tubes, rods and plates for engineering and the automotive industry.
EFFECT: invention makes it possible to produce polyamides with a short holding time produced at low temperatures, as well as to produce moulded parts with improved characteristics.
7 cl, 1 tbl, 1 ex
