MISCHUNG ZUR HERSTELLUNG VON FORMKOERPERN.

摘要

Moulded articles (I) are mfd. from fire-proofing materials by processing a flowable resin-based master batch (II) contg. thermoplastic resin (II) and foam-forming substances (IV), at a plastification temp. which is below the foaming temp., then moulding, e.g. by extrusion or injection-moulding. Specifically, (III) is PVC; (II) is first mixed with (III), followed by a plasticiser; resin in (II) is aminoplastic, polyamide, PF resin or a mixt. thereof, esp. comprising 15-40 wt.% phenolic resin (opt. heat-active in the presence of an aldehyde source), 25-40 wt.% ammonium salt, 10-20 wt.% carbohydrate or polyol, and 15-40 wt.% heat-replaceable organic N-cpd., or 10-70 (esp. 30-70) wt.% plasticised PVC and 30-90 wt.% of a mixt. of 25-60 wt.% polyol, 1-45 wt.% polyamide and 5-30 wt.% ammonium phosphate; water- or solvent-sol. vinyl polymer binder or aminoplast is also added to these compsns. Mixt. also contains Na silicate, expanded graphite or mica, pref. with halogenated (esp. Br) organic cpd., esp. pref. also with ammonium pentaborate; processing temp. is below the usual processing temp. of (III). (I) are mfd. by coextrusion or injection moulding, with a thermoplastic sheath.