Particle foam mouled parts from impact modified thermoplastic polymer granulate

摘要

Particle foam mouldings (I) with a density of 8-100 g/l, obtained by welding together pre-foamed particles made from expandable, impact-modified, thermoplastic polymer granules. Independent claims are also included for (1) expandable thermoplastic granules (II) modified with 5-15 wt% dispersed rubber particles with an average particle size of 0.1-10 microns (2) a method for the production of (II) by mixing an organic blowing agent into an impact-modified polymer melt with a static or dynamic mixer at a temperature of at least 150[deg]C, cooling to at least 120[deg]C, passing the melt through a perforated die plate in which the diameter of the holes at the outlet is not more than 1.5 mm and then granulating the melt under water at 1-20 bar (3) a method for the production of (I) by prefoaming (II) to a density of 8-100 g/l with the aid of hot air or steam and then welding the prefoamed particles together in a closed mould .