Ionic polymer foam and the preparation thereof

Details Ionic polymer foam and the preparation thereof Ionic polymer foam and the preparation thereof

C - Chemistry, Metallurgy

08

J

403/59, 403/9

C08J 9/14 (2006.01) C08J 9/04 (2006.01) C08J 11/08 (2006.01)

Patent

CA 1042147

ABSTRACT OF THE DISCLOSURE This invention relates to a process for preparing novel foamed polymeric products which comprises foaming an ionic polymer in the presence of a volatile polar compound which acts as a plasticizer for the ionic groups present in said ionic polymer. Preferably, the ionic polymer comprises from about 0.2 to 20 mole % pendant ionic groups, especially sulfonate groups. In the most preferred embodiment of the instant invention, a sulfonate polystyrene polymer admixed with a foaming agent, and a volatile polar compound, e.g. methanol, is heated to a temperature at which foaming occurs. Upon cooling, a high strength, low density foam id formed which can be reprocessed by admixing with a low boiling solvent for polystyrene and methanol and repeating the above foaming process.

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