Production of polyamide with a low dirt content, e.g. for production of mouldings, film or fibres, involves polymerization with a higher water vapor pressure and granulation at higher hydraulic pressure

摘要

A method for the production of polyamides by polymerization involves being carried out in the presence of water followed by granulation and post-polymerization, in which the monomers are polymerized at a water vapor pressure (p1) of at least 3 bar and the polymer melt is taken off in presence of a liquid, cooled and granulated at a hydraulic pressure (p2) of at least 3 bar. Independent claims are also included for: (1) polyamides obtained by this method; and (2) molded products, film, fibres and foam made from these polyamides.