Patent ID: 9663625
Date: 2017-05-30
CPC Classifications: B29C,B29K,B29L,C08J,C08L

Claim:
1. A process for producing a melamine-formaldehyde foam, said process comprising the steps of: a) producing an aqueous mixture M1) comprising b) heating and foaming said mixture M1) using microwave radiation, c) crosslinking and curing the resulting foam using the curative and microwave radiation, d) drying the foam using microwave radiation, and e) annealing the dried foam using hot air, wherein said mixture M1) comprises a surfactant mixture comprising a mixture of 50 to 90 wt % of an anionic surfactant and 10 to 50 wt % of a nonionic surfactant, wherein the weight percentages are each based on the total weight of the surfactant mixture; wherein said mixture M1) is continuously fed to a horizontally disposed foaming channel in which steps b), c), d) and e) are carried out continuously; and wherein the foaming channel is supplied with air and/or nitrogen via one or more feed points and rid of off-gases via one or more removal points.