Manufacture of resilient foams based on a melamine-formaldehyde condensate
AssigneeBASF SE
InventorsHarald Mahnke, Guenter Kreibiehl, Heinz Weber, Frank P. Woerner
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Abstract
A process for the manufacture of a resilient foam based on a melamine-formaldehyde condensate, wherein an aqueous or alcoholic solution or dispersion containing a melamine-formaldehyde precondensate, an emulsifier, a blowing agent and a hardener is foamed by ultra-high-frequency irradiation and the foam is hardened by crosslinking the precondensate. The foam may be employed for heat and sound insulation, and as a packaging material.
Claims4
A process for the manufacture of a resilient foam, based on a melamine-formaldehyde condensate, by foaming an aqueous or alcoholic solution or dispersion which contains a melamine-formaldehyde precondensate, an emulsifier, a blowing agent and a hardener, with or without conventional additives, and then crosslinking the precondensate, wherein, to effect foaming and crosslinking, the solution or dispersion is heated by ultra-high-frequency irradiation in the form of microwaves in the frequency range of from 0.2 GHz to 100 GHz in such a manner that the power uptake of the solution or dispersion is from 5 to 200 KW per kg of water or alcohol in the solution or dispersion.
Dependencies are inferred from the claim text.