Manufacture of resilient foams based on a melamine-formaldehyde

Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy

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264 26, 521136, 521137, 521181, 521187, 521188, 521915, C08G 202

Patent

active

043349714

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.

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patent: 4273887 (1981-06-01), Wolff

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