Process for the continuous production of a flame-resistant foamed plastics material

Abstract From the Canadian patent

A continuous process for the production of flameresistant foamed plastics material by condensation of aqueous aminoplast precondensates with diisocyanates or polyisocyanates wherein, in a first mixing stage, the isocyanate is mixed with 4 to 14% by weight of catalyst, the catalyst being an organic amine and/or an organic metal compound at temperatures of 40°, to 230°C, with a residence time of 1 to 8 seconds and directly, thereafter, in a second mixing stage the aminoplast preconden-, sate and, simultaneously but separately from the aminoplast an, acid curing catalyst are introduced after which the foamable, mixture thereby produced is discharged continuously. The apparatus for performing …